Dialog Semiconductor SmartBond DA14585 User manual

Company Confidential
User Manual
DA14585 Range Extender
Reference Application
UM-B-089
Abstract
This document describes the hardware system setup of a range extender daughterboard based on
the Dialog DA14585 Bluetooth® low energy SoC and the Skyworks SKY66111-11 Front End Module.
Target hardware: DA14585_rd_qfn40_fem_module_vB –Board Number: 321-13-B. Target silicon:
DA14585

UM-B-089
DA14585 Range Extender Reference Application
Company Confidential
User Manual
Revision 1.0
14-Nov-2017
CFR0012
2 of 77
© 2017 Dialog Semiconductor
Contents
Abstract................................................................................................................................................ 1
Contents............................................................................................................................................... 2
Figures.................................................................................................................................................. 4
Tables ................................................................................................................................................... 5
1Terms and Definitions................................................................................................................... 6
2References..................................................................................................................................... 6
3Introduction.................................................................................................................................... 7
4System Overview........................................................................................................................... 8
4.1 Features................................................................................................................................ 8
4.2 System Description............................................................................................................. 10
4.3 System Interface................................................................................................................. 11
5System Power Supply................................................................................................................. 12
6Bluetooth Low Energy SoC........................................................................................................ 12
7RF Front End................................................................................................................................ 14
7.1 Power amplifier ................................................................................................................... 15
7.2 Control Signals.................................................................................................................... 16
7.2.1 RF Control Signals............................................................................................... 16
7.2.2 Power Control Signals ......................................................................................... 18
7.3 GPIO setup ......................................................................................................................... 18
7.4 Filtering................................................................................................................................ 19
7.5 Antenna............................................................................................................................... 20
7.6 Resistive attenuator (optional) ............................................................................................ 22
8TX Output Power Control Circuit............................................................................................... 23
9Crystals ........................................................................................................................................ 26
10 Reference Design Pin Assignment............................................................................................ 27
11 Development mode - Peripheral Pin Mapping.......................................................................... 28
12 PCB Assembly............................................................................................................................. 29
12.1 DA14585 Range Extender Schematic................................................................................ 30
12.2 Bill of Materials.................................................................................................................... 31
13 BLE Measurements..................................................................................................................... 33
13.1 Basic Performance Measurements..................................................................................... 33
13.1.1 Receiver Sensitivity ............................................................................................. 34
13.1.1.1 Test Description............................................................................... 34
13.1.1.2 Test Setup ....................................................................................... 34
13.1.1.3 Test Results..................................................................................... 34
13.1.2 Transmitter Output Power.................................................................................... 37
13.1.2.1 Test Description............................................................................... 37
13.1.2.2 Test Setup ....................................................................................... 37
13.1.2.3 Test Results..................................................................................... 37
13.1.3 Current Consumption........................................................................................... 38
13.1.3.1 Test Description............................................................................... 38
13.1.3.2 Test Setup ....................................................................................... 38

UM-B-089
DA14585 Range Extender Reference Application
Company Confidential
User Manual
Revision 1.0
14-Nov-2017
CFR0012
3 of 77
© 2017 Dialog Semiconductor
13.1.3.3 Test Results..................................................................................... 39
13.2 BLE FCC Precertification Measurements........................................................................... 41
13.2.1 Maximum Output Power and Antenna Gain (Transmitter).................................. 41
13.2.1.1 Test Specification ............................................................................ 41
13.2.1.2 Test Setup ....................................................................................... 41
13.2.1.3 Test Results..................................................................................... 41
13.2.2 Emissions Limitations Conducted (Transmitter).................................................. 44
13.2.2.1 Test Specification ............................................................................ 44
13.2.2.2 Test Setup ....................................................................................... 44
13.2.2.3 Test Results..................................................................................... 44
13.2.3 Band Edge Compliance Radiated (Transmitter).................................................. 47
13.2.3.1 Test Specification ............................................................................ 47
13.2.3.2 Test Setup ....................................................................................... 47
13.2.3.3 Test Results..................................................................................... 47
13.2.4 Band Edge Compliance Conducted (Transmitter)............................................... 49
13.2.4.1 Test Specification ............................................................................ 49
13.2.4.2 Test Setup ....................................................................................... 49
13.2.4.3 Test Results..................................................................................... 49
13.2.5 Spurious Emissions Radiated above 1GHz......................................................... 51
13.2.5.1 Test Specification ............................................................................ 51
13.2.5.2 Test Setup ....................................................................................... 51
13.2.5.3 Test Results..................................................................................... 51
14 PCB Design Guidelines .............................................................................................................. 53
14.1 Antenna Selection............................................................................................................... 53
14.2 RF layout design ................................................................................................................. 54
14.2.1 Radio IC............................................................................................................... 54
14.2.2 RF transmission lines .......................................................................................... 55
14.2.3 RX Spurious Emissions....................................................................................... 55
15 Safety Information....................................................................................................................... 58
Appendix A Application Software Guide ........................................................................................ 59
A.1 Driver Implementation......................................................................................................... 59
A.1.1 SKY66111.h......................................................................................................... 59
A.1.2 SKY66111.c......................................................................................................... 60
A.2 Insert driver to proximity reporter project ............................................................................ 65
A.2.1 Steps.................................................................................................................... 65
A.3 Insert driver to prod_test..................................................................................................... 70
A.4 Building for different operating modes................................................................................ 71
A.4.1 Example: Building for FOUR_DBM power operation .......................................... 71
Appendix B Optimizing PWM Current Consumption..................................................................... 74
Revision History ................................................................................................................................ 76

UM-B-089
DA14585 Range Extender Reference Application
Company Confidential
User Manual
Revision 1.0
14-Nov-2017
CFR0012
4 of 77
© 2017 Dialog Semiconductor
Figures
Figure 1: PCB of the DA14585 Range Extender (321-13-B) ................................................................ 7
Figure 2: Block Diagram of Range Extender (321-13-B) .................................................................... 10
Figure 3: DA14585 Range Extender (321-13-B) on a DA14580 PRO-Dev.Kit Motherboard ............. 11
Figure 4: Layout of the DA14585 Range Extender daughterboard..................................................... 11
Figure 5:DA14585 QFN40 SoC DA14585 Range Extender ............................................................... 13
Figure 6: RF Front End signal paths ................................................................................................... 14
Figure 7: RF Front End schematic ...................................................................................................... 14
Figure 8: SKY66111-11 Power Amplifier............................................................................................. 15
Figure 9: SKY66111-11 Front End Module - overview........................................................................ 16
Figure 10: BLE_DIAGCNTL_REG (0x40000050) register specification............................................. 17
Figure 11: BLE_DIAGCNTL2_REG (0x4000020C) register specification .......................................... 17
Figure 12: BLE_DIAGCNTL3_REG (0x40000210) register specification........................................... 17
Figure 13: Low Pass Filter (L7&L5=2.7nH, C18=1.2pF)..................................................................... 19
Figure 14: T-shaped, 3-poles, Low Pass Filter.................................................................................... 19
Figure 15: Printed Inverted F Antenna geometry................................................................................ 20
Figure 16: Matching network for printed antenna................................................................................ 20
Figure 17: S parameters of Printed IFA and Matching Network.......................................................... 21
Figure 18: Radiation diagram for the board placed vertically.............................................................. 22
Figure 19: Radiation diagram for the board placed horizontally.......................................................... 22
Figure 20: SKY66111-11 POUT vs VCC & VBIAS (PIN=-1dBm).............................................................. 23
Figure 21: Power regulation circuit...................................................................................................... 23
Figure 22: TX Output Power using PWM mode, 3 channels............................................................... 24
Figure 23: PWM Duty Cycle vs TX Output Power and VCC............................................................... 25
Figure 24: Top view of PCBA.............................................................................................................. 29
Figure 25: Bottom view of PCBA......................................................................................................... 29
Figure 26: RX Sensitivity, Dirty Transmitter OFF, Payload: PRBS9, Length: 37, MAX_POWER ...... 35
Figure 27: RX Sensitivity, Dirty Transmitter, Payload: PRBS9, Length: 37, MAX_POWER............... 36
Figure 28: Nominal Average TX Output Power per channel vs all power levels................................. 37
Figure 29: Maximum Output Power, CH00 ......................................................................................... 42
Figure 30: Maximum Output Power, CH19 ......................................................................................... 42
Figure 31: Maximum Output Power, CH39 ......................................................................................... 43
Figure 32: Harmonics Level, Lowest Frequency, CH00...................................................................... 45
Figure 33: Harmonics Level, Lowest Frequency, CH19...................................................................... 45
Figure 34: Harmonics Level, Lowest Frequency, CH39...................................................................... 46
Figure 35: Radiated Emissions in Lower Restricted Band, CH00....................................................... 48
Figure 36: Radiated Emissions in Upper Restricted Band, CH39....................................................... 48
Figure 37: Conducted Emissions in Lower Band Edge, CH00............................................................ 49
Figure 38: Conducted Emissions in Upper Band Edge, CH39............................................................ 50
Figure 39: TX spurious emissions radiated, CH00.............................................................................. 52
Figure 40: RX spurious emissions radiated, CH00 ............................................................................. 52
Figure 41: Full size IFA used in DA14585 Range Extender with dimensions..................................... 53
Figure 42:DA14585 Range Extender board layout snapshot.............................................................. 54
Figure 43: Placement of filter and matching network.......................................................................... 55
Figure 44: Safety Information of DA14585 Range Extender............................................................... 58
Figure 45: Control pins configuration in SKY66111.h ......................................................................... 59
Figure 46: Power modes definition in SKY66111.h............................................................................. 59
Figure 47: Definition of PWM duty cycle preset values in SKY66111.h.............................................. 60
Figure 48: Global variables declaration in SKY66111.c for the range_ext_api.h................................ 60
Figure 49: Configure GPIOs for SKY66111 operation ........................................................................ 61
Figure 50: Function timer0_conf_start();............................................................................................. 61
Figure 51: Function declare_fem_gpios();........................................................................................... 62
Figure 52: Function app_range_extender_enable();........................................................................... 63
Figure 53: Function app_range_extender_sleep();............................................................................. 64
Figure 54: Function app_set_power(); ................................................................................................ 64
Figure 55: function range_ext_init();.................................................................................................... 64
Figure 56: Copy rext_sky66111-11_v1.0 folder into sdk driver........................................................... 65
Figure 57: Step 2 of adding sky66111.c to sdk_driver........................................................................ 66
Figure 58: Step 3a, Select target options............................................................................................ 66

UM-B-089
DA14585 Range Extender Reference Application
Company Confidential
User Manual
Revision 1.0
14-Nov-2017
CFR0012
5 of 77
© 2017 Dialog Semiconductor
Figure 59: Step 3b, include sky6611.c and range_ext_api.h at the compiler include paths............... 67
Figure 60: include timer0.c path at the end of compiler include paths................................................ 67
Figure 61: define CFG_RANGE_EXT in da1458x_config_advanced.h.............................................. 68
Figure 62: range_ext.enable() after ble_init() in arch_system.c.......................................................... 69
Figure 63: range_ext.enable() at the end of rf_reinit() in rf_585.c ...................................................... 69
Figure 64: range_ext.enable() at the end of set_pad_functions() in user_periph_setup.c ................. 69
Figure 65: Include sky66111.h in user_periph_setup.c....................................................................... 70
Figure 66: Call range_ext.enable() at the end of set_pad_functions() in user_periph_setup.c .......... 70
Figure 67: Set FOUR_DBM in range_ext.enable() in rf_585.c............................................................ 71
Figure 68: Set FOUR_DBM in range_ext.enable() in arch_system.c ................................................. 72
Figure 69: Set FOUR_DBM in range_ext.enable() in user_periph_setup.c........................................ 72
Figure 70: Build project in order to produce the FOUR_DBM hex file ................................................ 73
Figure 71: PWM optimized RC circuit ................................................................................................. 74
Tables
Table 1: Electrical Characteristics (Note 5)........................................................................................... 9
Table 2: Jumper Settings for Power Schemes of DA14580 PRO-Dev.Kit Motherboard..................... 12
Table 3: Truth Table for SKY66111-11 ............................................................................................... 16
Table 4: Power control Signals Configuration..................................................................................... 18
Table 5: Suggested pin assignment for extracting all RF control signals ........................................... 18
Table 6: GPIO setup of FEM power control signals............................................................................ 19
Table 7: Antenna gain ......................................................................................................................... 21
Table 8: SKY66111-11 TX Output Power Typical values and Accuracy over PWM Duty Cycle (Note
13)........................................................................................................................................................ 24
Table 9: SKY66111 VCC voltage level for all power modes............................................................... 25
Table 10: Y1 16 MHz Crystal Characteristics...................................................................................... 26
Table 11: Y2 32 kHz Crystal Characteristics....................................................................................... 26
Table 12: DA14585 aQFN40 Pin Assignment..................................................................................... 27
Table 13: Development/ testing mode pin mapping............................................................................ 28
Table 14: Bill of Materials .................................................................................................................... 31
Table 15: RX Sensitivity for all power levels, Dirty Transmitter OFF (Note 15) .................................. 34
Table 16: RX Sensitivity for all power levels, Dirty Transmitter ON (Note 16).................................... 34
Table 17: Nominal Average TX Power (Note 17)................................................................................ 37
Table 18: Current consumption during Advertising Mode (Note 18)................................................... 39
Table 19: Current consumption during Connection Mode (Note 19) .................................................. 39
Table 20: Current consumption during Sleep Mode............................................................................ 40
Table 21: Maximum (Peak) Output Power (dBm), RBIAS = 2.2k, CH00, CH19, CH39...................... 41
Table 22: Measured Reference Level................................................................................................. 44
Table 23: Conducted TX Harmonics at CH00, CH19, CH39 .............................................................. 44
Table 24: Band edge compliance radiated.......................................................................................... 47
Table 25: Band edge compliance conducted...................................................................................... 49
Table 26: TX spurious emissions radiated limits................................................................................. 51
Table 27: TX spurious emissions radiated.......................................................................................... 51
Table 28: RX spurious emissions radiated.......................................................................................... 51
Table 29: Antenna types comparison.................................................................................................. 54
Table 30: SKY66111-11 modified PWM Duty Cycle for R2=10K, C22=10nF..................................... 74
Table 31: Current consumption during Advertising Mode (R2=10K, C22=10nF) (Note 21) ............... 75
Table 32: Current consumption during Connection Mode (R2=10K, C22=10nF) (Note 22)............... 75

UM-B-089
DA14585 Range Extender Reference Application
Company Confidential
User Manual
Revision 1.0
14-Nov-2017
CFR0012
6 of 77
© 2017 Dialog Semiconductor
1 Terms and Definitions
ADC Analog to Digital Converter
BLE Bluetooth Low Energy
BOM Bill of Materials
EIRP Effective Isotropic Radiated Power
FEM Front End Module
FW Firmware
GPIO General Purpose Input/ Output
I2C Inter-Integrated Circuit
IFA Inverted-F Antenna
LPF Low Pass Filter
MBd Megabaud
PA Power Amplifier
PCBA Printed Circuit Board Assembled
PCB Printed Circuit Board
RF Radio Frequency
RFCU RF Control Unit
RX receive(r)
SoC System on Chip
SPI Serial Peripheral Interface
TX transmit(ter)
2 References
[1] UM-B-034, DA14580_581_583 Bluetooth Smart Development Kit - Pro_v1.4, User Manual,
Dialog Semiconductor.
[2] SKY66111-11, Datasheet, Skyworks Inc.
[3] DA14585 Bluetooth 5.0 SoC with Audio Interface, Datasheet, Dialog Semiconductor.
[4] UM-B-008, DA14580_581_583 Production Line Tool reference CLI_v1.7, User Manual, Dialog
Semiconductor.
[5] AN-B-020, End Product testing and programming guidelines, Application Note, Dialog
Semiconductor.
[6] AN-B-027, Designing Printed Antennas for Bluetooth® Smart, Application Note, Dialog
Semiconductor.

UM-B-089
DA14585 Range Extender Reference Application
Company Confidential
User Manual
Revision 1.0
14-Nov-2017
CFR0012
7 of 77
© 2017 Dialog Semiconductor
3 Introduction
The DA14585 Range Extender (321-13-B) is a reference design based on DA14585 Bluetooth Low
Energy 5.0 SoC, where enhanced RF transmitted power is presented. The DA14585 Range
Extender board serves as a reference design to potential customers requesting enhanced BLE RF
Programmable Output Power up to +9.3 dBm. From physical perspective, the board consists of a 2-
layer PCBA where the digital and power interfaces of the DA14585 are accessible to the user. This
document presents the system, technical specifications, physical dimensions and test results.
Figure 1: PCB of the DA14585 Range Extender (321-13-B)

UM-B-089
DA14585 Range Extender Reference Application
Company Confidential
User Manual
Revision 1.0
14-Nov-2017
CFR0012
8 of 77
© 2017 Dialog Semiconductor
4 System Overview
4.1 Features
■Highly integrated DA14585 Bluetooth Low Energy 5.0 SoC
■Can be used stand-alone or as a data pump on a system with an external processor
■Complies to Bluetooth v5.0, ETSI EN 300 328 and EN 300 440 Class 2 ( Europe), FCC CFR47
Part 15 ( US) and ARIB STD-T66 ( Japan)
■Buck mode operation
■Operating voltage: 1.8 V to 3.6 V
■Maximum BLE transmit output power +9.3 dBm (See Note 1)
■Programmable transmit output power with steps of 2dBm
■Includes two crystal oscillators: 16 MHz (XTAL16M) and 32.738 kHz (XTAL32K)
■Access to processor via JTAG, SPI, UART or I2C interface
■21 general purpose I/Os with programmable voltage levels
■On-board printed inverted F-type antenna (Figure 4)
■U.FL connector for conducted measurements (Figure 4)
■BLE Radio transceiver (See Note 2):
○receiver sensitivity better than -91 dBm ( See Note 3)
■Supply current ( See Note 4):
○TX: max. current < 17 mA
○RX: max. current < 6 mA
○Extended - Sleep current: <5 µA
■34 mm x 42 mm, 2 layer PCBA
■Operating temperature: –40 ºC to +85 ºC
■Test FW based on 585 SDK 6.0.6
Note 1 Conducted power
Note 2 FCC part 15.247, 15.209 compliance.
Note 3 Dirty transmitter: ON, 1500 packets, payload PRBS9 length 37bytes.
Note 4 Normal operation, using SDK proximity reporter application, TX output power +9.3 dBm, peak values.

UM-B-089
DA14585 Range Extender Reference Application
Company Confidential
User Manual
Revision 1.0
14-Nov-2017
CFR0012
9 of 77
© 2017 Dialog Semiconductor
Table 1: Electrical Characteristics (Note 5)
Parameter
Value
TX Output Power
BYPASS: -1.5 dBm
ZERO_DBM: 0 dBm
TWO_DBM: +2 dBm
FOUR_DBM :+4 dBm
SIX_DBM: +6 dBm
EIGHT_DBM: +8 dBm
MAX_POWER: +9.3 dBm
RX Sensitivity(See Note 3)
better than -91 dBm
Maximum current consumption in TX mode
BYPASS< 6 mA
ZERO_DBM<10.5 mA
TWO_DBM<11.5 mA
FOUR_DBM <12.5 mA
SIX_DBM<13.5 mA
EIGHT_DBM<15 mA
MAX_POWER <17 mA
Maximum current consumption in RX mode
< 6 mA
Average current consumption during sleep mode
< 5 µA
Note 5 Peak Maximum Ratings

UM-B-089
DA14585 Range Extender Reference Application
Company Confidential
User Manual
Revision 1.0
14-Nov-2017
CFR0012
10 of 77
© 2017 Dialog Semiconductor
4.2 System Description
The system consists of DA14585 SoC in aQFN40 package (see Ref.[3]), the SKY66111-11 RF Front
End Module (see Ref. [2]), external crystals of 16 MHz and 32.768 kHz, a discrete low pass filter and
an external circuit that controls the power supply of the SKY66111-11. The radio front end is
connected to a PCB trace antenna.
The power amplifier is controlled by CTRL_TX and CTRL_RX control signals. CTRL_TX is generated
from pin P0_1 and CTRL_RX is generated from pin P0_2 of DA14585 SoC. On pin P0_1 and P0_2
the internal Radio_TXEN and Radio_RXEN signals are allocated by software.
An external TX power control circuit is used for adjusting the voltage level of SKY66111-11 VCC
power supply pin. By adjusting VCC the output power of the PA can be regulated. Two control
signals generated from pins P2_1 and P2_7 drive the external power control circuit.
The system can be configured to operate in three different modes:
●Programmable Output Power Mode: 0 to +8dBm in steps of 2 dBm
●Maximum Output Power Mode: +9.3 dBm
●Bypass Mode: -1.5 dBm
External connections provide access to Supply, DC/DC configuration, available Peripheral IO, Test,
Software Development and OTP Programming.
The amplifier circuit is the SKY66111-11 from Skyworks. The CTX pin is used as the TX control
signal and amplifier bias voltage. CTX pin is connected to the amplifier BIAS pin via resistor RBIAS.
The resistor value is adjusted in order to get the maximum allowed output power (+9.3dBm, see Note
6).
Note 6 FCC part 15.247, 15.209 compliance
A system overview is shown in Figure 2.
Figure 2: Block Diagram of Range Extender (321-13-B)

UM-B-089
DA14585 Range Extender Reference Application
Company Confidential
User Manual
Revision 1.0
14-Nov-2017
CFR0012
11 of 77
© 2017 Dialog Semiconductor
4.3 System Interface
DA14585 Range Extender daughterboard is plugged into header J4 of the DA14580 PRO-Dev.Kit
Motherboard, as shown in Figure 3.
The PRO-motherboard provides UART and JTAG (SWD) interfaces to the DA14585, current
measurement circuitry, as well as breakout headers (J5, J7) for the available GPIOs and general
purpose user peripherals. For more details on the functionality and specifications of the motherboard,
refer to user manual UM-B-034 (see Ref. [1]).
The system is powered via the Debug USB port (J12). The daughterboard can also be independently
programmed, using an external battery connected on the board coin cell connector (see Section 5 for
more details). The layout and main features of the daughterboard are shown in Figure 4.
Figure 3: DA14585 Range Extender (321-13-B) on a DA14580 PRO-Dev.Kit Motherboard
Figure 4: Layout of the DA14585 Range Extender daughterboard

UM-B-089
DA14585 Range Extender Reference Application
Company Confidential
User Manual
Revision 1.0
14-Nov-2017
CFR0012
12 of 77
© 2017 Dialog Semiconductor
5 System Power Supply
There are three options for powering the system when using the DA14580 PRO-Dev.Kit
Motherboard.
●The PRO motherboard’s voltage regulator (VDD_3V3_PERF, see Ref. [1]), which is powered
from USB (J12).
●A coin cell battery on the PRO motherboard (BT1).
●A coin cell battery on the daughterboard of DA14585 Range Extender.
The power source is selectable with jumper header J11 from PRO Dev.Kit to either coin cell on PRO
Dev.Kit or USB (Figure 3).
The different configurations for each of the power schemes using the DA14580 PRO-Dev.Kit
Motherboard are described in Table 2.
Table 2: Jumper Settings for Power Schemes of DA14580 PRO-Dev.Kit Motherboard
Power Scheme
Indication DA14580
Power
J11
USB
Motherboard LDO
USB
1-2
Power + programming
Coin cell Battery mounted on
motherboard (BT1)
BAT
2-3
Programming
Coin cell Battery mounted on
daughterboard
-
open
Programming
Warning: If the coin cell on the daughterboard is used then jumper J11 should be left open.
6 Bluetooth Low Energy SoC
The DA14585 integrated circuit (see Ref.[3]), is an optimized version of the DA14580, offering a
reduced boot time and supporting up to 8 connections. It has a fully integrated radio transceiver and
baseband processor for Bluetooth® Low Energy. It can be used as a standalone application
processor or as a data pump in hosted systems.
The Bluetooth Low Energy firmware includes the L2CAP service layer protocols, Security Manager
(SM), Attribute Protocol (ATT), the Generic Attribute Profile (GATT) and the Generic Access Profile
(GAP). All profiles published by the Bluetooth SIG as well as custom profiles are supported.
The transceiver interfaces directly to the antenna and is fully compliant with the Bluetooth 5.0
standard.
The DA14585 has dedicated hardware for the Link Layer implementation of Bluetooth Low Energy
and interface controllers for enhanced connectivity capabilities.
The DA14585 is based on an ARM Cortex M0 CPU and provides 0.9dMIPS/MHz. It is used for
assisting the Bluetooth LE protocol implementation, as well as providing processing power for
calculations or data fetched, that may be required by the application. Finally, it is used for
housekeeping, including control of the system's power scheme.
It has a 128KB ROM containing the Bluetooth Smart protocol stack as well as the boot code
sequence, a 64 kB OTP (One-Time Programmable) memory array, used to store the application
code and 94kB total RAM. Storage of this data ensures secure and quick configuration of the BLE
Core after the system wakes up. Every cell can be powered on or off according to the application
needs for retention area when in Extended Sleep mode.
The DA14585 has an audio interface that comprises three separate blocks: a PDM block, a PCM/I2S
block and a Sample Rate Converter (SRC block) with DMA support.

UM-B-089
DA14585 Range Extender Reference Application
Company Confidential
User Manual
Revision 1.0
14-Nov-2017
CFR0012
13 of 77
© 2017 Dialog Semiconductor
The main debug port for the DA14585 is the JTAG. JTAG consists of two signals, SWDIO and
SWCLK.
The external digital interfaces available for the module are:
●2 UARTs with hardware flow control up to 1 MBd
●SPI+™ interface
●I2C bus at 100 kHz or 400 kHz
●3-axis capable Quadrature Decoder
There is also a 4-channel 10-bit ADC; it is available externally on the module.
The module includes 25 GPIOs (including JTAG signals) that are externally available. The interfaces
are multiplexed with the GPIOs and can be enabled by appropriate programming.
The DA14585 SoC has a complete power management function integrated with Buck or Boost DC-
DC converter and separate LDOs for the different power domains of the system. For this module, the
DC-DC converter is configured as a Buck converter (C2, L1 and C3).
The DA14585 SoC is available in three packages: WLCSP34, QFN40 and QFN48. In this reference
application the QFN40 is used.
Figure 5:DA14585 QFN40 SoC DA14585 Range Extender

UM-B-089
DA14585 Range Extender Reference Application
Company Confidential
User Manual
Revision 1.0
14-Nov-2017
CFR0012
14 of 77
© 2017 Dialog Semiconductor
7 RF Front End
This part of the design is implementing the amplification of the RF transmitted signal while the
transmitted harmonics as well as the TX spurious emissions remain within the FCC/ ETSI
specification.
The operation of the RF Front End Module (FEM) is controlled by the DA14585 SoC. During the
operation of the FEM there are two available RF paths:
●TX path through the amplifier
●TX/RX bypass path
The amplifier path is enabled during transmission. The RF signal passes through the PA, the low
pass filter and the RF matching network. In the bypass path, the RF signal received at the antenna is
driven directly to the BLE transceiver. The bypass path can be also used from the TX. In this case
the PA of the FEM is not used. Insertion loss in the reception mode is 0.9dBm (see Ref. [2]).
Low Pass
Filter Matching circuit
Amplifier
SKY66111-11
Amplifier bypass path
Power Amplifier Path
RFIOP Low Pass Filter
or attenuator
(optional)
DA14585
QFN40
BTLE SoC
uFL
Figure 6: RF Front End signal paths
Figure 7: RF Front End schematic

UM-B-089
DA14585 Range Extender Reference Application
Company Confidential
User Manual
Revision 1.0
14-Nov-2017
CFR0012
15 of 77
© 2017 Dialog Semiconductor
7.1 Power amplifier
The amplifier circuit is the SKY66111-11 from Skyworks (see Ref.[2] ). The SKY66111-11 is a fully
integrated RF Front End Module (FEM) designed for Smart Energy applications. The device provides
a PA and digital controls compatible with 1.7 V to 5 V CMOS levels. The basic characteristics for the
SKY66111-11 are:
●TX Power:10 dBm
●TX current: 10mA
●RX sensitivity: SoC+1 (see Note 7)
●RX current: 1 μA
●Sleep current< 1 μA
●Supply operation:1.8 to 5 V
●CTX and CRX control signals
●RX bypass
●One antenna port
Note 7 The FEM presents around 1dBm insertion loss when receiving signals than the SoC alone.
Figure 8: SKY66111-11 Power Amplifier
The SKY66111-11 CTX pin is used as the TX control signal and amplifier bias voltage while CRX pin
is used as the RX control signal.
The SKY66111-11 BIAS pin supplies the bias to the internal PA. By varying the voltage at this pin,
PA operating parameters including gain, supply current, and efficiency can be adjusted. The desired
bias voltage can also be generated by connecting BIAS to the GPIO controlling CTX with a resistor.
In the current design, the BIAS pin is connected to the CTX via resistor R7, providing a constant
voltage of VBIAS=1.8 V when the PA is enabled. The resistor value is adjusted so that the maximum
+9.3 dBm output power is achieved.
More information regarding the output power adjustment of the PA can be found in SKY66111-11
datasheet (see Ref. [2]).

UM-B-089
DA14585 Range Extender Reference Application
Company Confidential
User Manual
Revision 1.0
14-Nov-2017
CFR0012
16 of 77
© 2017 Dialog Semiconductor
Figure 9: SKY66111-11 Front End Module - overview
7.2 Control Signals
7.2.1 RF Control Signals
The SKY66111-11 is controlled by CTX and CRX control signals. Their functionality is explained in
Table 3.
Table 3: Truth Table for SKY66111-11
Mode
CTX
CRX
BIAS
Sleep mode
0
0
0
Receive (RX) mode
0
1
0
Transmit (TX) mode
1
0
1 (See Note 8)
Non- permissible state
(See Note 9)
1
1
X
Note 8 Analog voltage control for PA output power.
Note 9 This state will enable both the TX and RX paths. It is not permitted to operate in this state.
These control signals are extracted by the DA14585 BLE diagnostic port, as they have to be
synchronized with the radio on/ off of the DA14585 SoC.
In general, three different radio control signals can be extracted from DA14585 SoC:
●extrc_txen or radcntl_txen that can be used as TX_En control signal for the RF front end
●extrc_rxen or radcntl_rxen that can be used as RX_En control signals for the RF front end. Also
extrc_txen inverted or radcntl_txen inverted can be used (See Note 10).
●event_in_process that can be used for wlan co-existence signal
Note 10 As long as BLE radio is active, FEM does not enter Sleep Mode.

UM-B-089
DA14585 Range Extender Reference Application
Company Confidential
User Manual
Revision 1.0
14-Nov-2017
CFR0012
17 of 77
© 2017 Dialog Semiconductor
The signals are extracted using the BLE diagnostic port. To do so, the following registers need to be
programmed:
●BLE_DIAGCNTL_REG, BLE_DIAGCNTL2_REG where the diagnostic ports to be enabled are
defined
●BLE_ DIAGCNTL3_REG where the desired control signals will be forwarded to the BLE
diagnostic ports
Figure 10: BLE_DIAGCNTL_REG (0x40000050) register specification
Figure 11: BLE_DIAGCNTL2_REG (0x4000020C) register specification
Figure 12: BLE_DIAGCNTL3_REG (0x40000210) register specification
BLE diagnostics can be used only with P 0[0:7] and P1 [0:3] of DA14585 SoC.

UM-B-089
DA14585 Range Extender Reference Application
Company Confidential
User Manual
Revision 1.0
14-Nov-2017
CFR0012
18 of 77
© 2017 Dialog Semiconductor
7.2.2 Power Control Signals
An external circuit is used for adjusting the voltage level of SKY66111-11 VCC power supply pin. By
adjusting VCC the output power of the PA can be regulated.
In general, the system can be configured to operate in three different modes:
1. Programmable Output Power Mode: a PWM signal with programmable duty cycle is driving the
external circuit. The system operates in the range of 0 to +8dBm defined by the duty cycle used.
2. Maximum Output Power Mode: the system operates at maximum power as defined by the
RBIAS.
3. Bypass Mode: the PA is bypassed.
To configure modes 1 and 2, the following two control signals are used:
●CTRL_PWM: a PWM generated from DA14585 SoC with programmable duty cycle. Uses timer0.
●CTRL_PWM_BP: normal GPIO configured low or high
For the configuration of the Bypass mode CTX, CRX inverted signals are used (See Note 11).
The signal configuration for each of the modes described can be seen in Table 4.
Table 4: Power control Signals Configuration
Mode
CTRL_PWM
CTRL_PWM_BP
CTX
CRX
Programmable Output Power Mode
PWM
1
1
0
Maximum Power Mode
0
0
1
0
Bypass mode
Input pull-down
0
0 (See Note 11)
1 (See Note 11)
Note 11 CTX, CRX are configured as normal GPIO and not extracted from diagnostic port. CTX is configured
LOW and CRX HIGH during transmission.
7.3 GPIO setup
A suggested pin assignment for extracting the necessary RF control signals (CTX, CRX) from the
diagnostic port is described in Table 5.
In the current implementation the extrc_txen_inverted signal is used for controlling CRX. The
implementation improves the receiver characteristics as the FEM remains active during BLE radio
active time.
Table 5: Suggested pin assignment for extracting all RF control signals
Function
Signals used
Diagnostic port settings
DA14585
assigned
pins
BLE_DIAGCNTL_REG
BLE_DIAGCNTL3_REG
DIAG PORT
DIAG[x]
DIAG[x]_BIT
DIAG[x]_INV
PA_TX Enable
Extrc_txen
DIAG1
0x28
3
0
P0_1
PA_RX Enable
Extrc_txen
DIAG2
0x28
3
1
P0_2
Wlan_coexist
(See Note 12)
Event_in_process
DIAG3
0x03
4
0
P1_3
Note 12 Used for coexistence purposes, optional use for the RF controls

UM-B-089
DA14585 Range Extender Reference Application
Company Confidential
User Manual
Revision 1.0
14-Nov-2017
CFR0012
19 of 77
© 2017 Dialog Semiconductor
For the power control signals any two available GPIOs can be used. It is suggested though, for the
PWM signal to use a GPIO that is not close to the RF output of the DA14585 SoC.
In the current system the GPIOs described in Table 6 are used.
Table 6: GPIO setup of FEM power control signals
Control Signals Name
GPIOs
Operation
CTRL_PWM
P2_1
PWM active
CTRL_PWM_BP
P2_7
Maximum power mode
7.4 Filtering
The low pass filter is placed after the amplifier matching network to suppress the harmonics
generated due to the amplifier’s nonlinearity. The filter presents low losses in the 2.4 GHz to 2.5 GHz
frequency range (max. loss: 0.5 dB). The ripple on the pass band was chosen equal to 0.1dB.
Figure 13: Low Pass Filter (L7&L5=2.7nH, C18=1.2pF)
RFPA ANT
2n7
1p2
2n7
Figure 14: T-shaped, 3-poles, Low Pass Filter
The filter is a T- type Chebyshev 3rd order low pass filter. The filter configuration is presented in
Figure 14.
Component value:
2.7nH: LQP15MN2N7B02D / Murata
1.2pF: GJM1555C1H1R2CB01D/ Murata

UM-B-089
DA14585 Range Extender Reference Application
Company Confidential
User Manual
Revision 1.0
14-Nov-2017
CFR0012
20 of 77
© 2017 Dialog Semiconductor
7.5 Antenna
DA14585 SoC provides a single ended RFIO port, matched to 50 Ohm. The RF port consists of
RFIOp and RFIOm pins, where RFIOm is connected to ground. A copper trace with impedance of 50
Ohm interconnects the RF port and the RFIN of SKY66111-11.
SKY66111-11 provides one antenna output. At this port a printed Inverted F Antenna (IFA) is used.
Figure 15: Printed Inverted F Antenna geometry
A Pi-network composed of C16, L2 and C17 is available for matching purposes. For the current
design the matching components values for optimum power transfer are: C17= 0.7pF and L2=2.5nH.
Figure 16: Matching network for printed antenna