Dialog Semiconductor SmartBond DA14585 User manual

User Manual
DA14585 Voice RCU Hardware
Manual
UM-B-087
Abstract
This document describes the hardware design of the DA14585 Voice RCU reference design (Rev.B),
which is based on the Dialog Semiconductor DA14585 Bluetooth® low energy SoC. This reference
design includes an accelerometer/gyro sensor, digital microphone, keypad, and a trackpad which is
placed on a separate daughterboard.

UM-B-087
DA14585 Voice RCU Hardware Manual
User Manual
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© 2017 Dialog Semiconductor
Contents
Abstract................................................................................................................................................ 1
Contents............................................................................................................................................... 2
Figures.................................................................................................................................................. 3
Tables ................................................................................................................................................... 3
1Terms and Definitions................................................................................................................... 4
2References..................................................................................................................................... 4
3Introduction.................................................................................................................................... 4
4System Overview........................................................................................................................... 5
4.1 Features................................................................................................................................ 5
4.2 Block Diagram....................................................................................................................... 5
4.3 PCBA Overview .................................................................................................................... 6
5DA14585 Voice RCU Reference Design ...................................................................................... 9
5.1 DA14585 SoC ....................................................................................................................... 9
5.2 Pin Assignment ................................................................................................................... 10
5.3 Power Management............................................................................................................ 11
5.4 Flash Memory ..................................................................................................................... 11
5.5 Crystal Oscillators ............................................................................................................... 12
5.6 Microphone ......................................................................................................................... 13
5.7 Capacitive Touch Controller................................................................................................ 14
5.8 Accelerometer/Gyroscope Sensor...................................................................................... 15
5.9 Infrared LED........................................................................................................................ 16
5.10 Buzzer 16
5.11 ON/OFF Switch................................................................................................................... 17
5.12 LEDs 17
5.13 Reset Button ....................................................................................................................... 18
5.14 Keypad Matrix ..................................................................................................................... 18
5.15 Printed Antenna .................................................................................................................. 19
6Schematics................................................................................................................................... 20
7PCB Layout.................................................................................................................................. 22
8Power Measurements ................................................................................................................. 24
9Enclosure..................................................................................................................................... 26
10 Configuration of the Debugging Interface................................................................................ 29
10.1 Debug/Programming Interface Scenarios........................................................................... 32
10.1.1 Scenario 1: RCU Inside the Enclosure................................................................ 32
10.1.2 Scenario 2: RCU Outside the Enclosure ............................................................. 32
Revision History ................................................................................................................................ 33

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Figures
Figure 1: Top Level Block Diagram of the DA14585 Voice RCU Reference Design............................ 5
Figure 2: DA14585 Voice RCU Reference Design (Rev B) - Top View................................................ 6
Figure 3: DA14585 Voice RCU Reference Design (Rev B) - Bottom View........................................... 6
Figure 4: Trackpad Daughterboard (Rev B) –Top View....................................................................... 7
Figure 5: Trackpad Daughterboard (Rev B) –Bottom View.................................................................. 7
Figure 7: Complete DA14585 Voice RCU Reference Design (Rev B) with Track Wheel..................... 8
Figure 6: Complete DA14585 Voice RCU Reference Design (Rev B) with Trackpad.......................... 8
Figure 8: DA14585 System Schematic ................................................................................................. 9
Figure 9: Serial NOR Flash Memory................................................................................................... 11
Figure 10: SPK0838HT4H Microphone Schematic............................................................................. 13
Figure 11: Capacitive Touch Controller Schematic (Trackpad) .......................................................... 14
Figure 12: Capacitive Touch Controller Schematic (Wheel) ............................................................... 14
Figure 13: BMI160- Inertial Sensor Schematic.................................................................................... 15
Figure 14: IR LED Schematic.............................................................................................................. 16
Figure 15: Buzzer Schematic .............................................................................................................. 16
Figure 16: Power ON/OFF Switch Schematic..................................................................................... 17
Figure 17: Indication LEDs Schematic ................................................................................................ 17
Figure 18: Reset Button Schematic and Actual Illustration................................................................. 18
Figure 19: Keypad Matrix Schematic .................................................................................................. 18
Figure 20: PCB view of a printed antenna........................................................................................... 19
Figure 21: Printed Antenna Radiation Pattern..................................................................................... 19
Figure 22: DA14585 Voice RCU Reference Design Rev. B1 - SoC, Flash Memory, Debugging Port20
Figure 23: DA14585 Voice RCU Reference Design Rev. B1 –Peripherals, Sensors........................ 21
Figure 24: DA14585 Voice RCU Reference Design Rev. B - Top View ............................................. 22
Figure 25: DA14585 Voice RCU Reference Design Rev. B - Bottom View........................................ 23
Figure 26: DA14585 Voice RCU Reference Design - PCB Stack-Up................................................. 23
Figure 27: DA14585 Voice RCU Reference Design –Average Operating Current............................ 24
Figure 28: DA14585 Voice RCU Reference Design –Average Sleep Current................................... 24
Figure 29: DA14585 Voice RCU Reference Design –Average Touch Pad Scanning Current .......... 25
Figure 30: DA14585 Voice RCU Reference Design –Current during Touch Pad Scan Pulse .......... 25
Figure 31: DA14585 Voice RCU Reference Design Enclosure –Top View....................................... 26
Figure 32: DA14585 Voice RCU Reference Design Enclosure –Bottom View.................................. 26
Figure 33: Connection of JTAG Cable with DA14585 Voice RCU PCB Inside Enclosure.................. 27
Figure 34: Connection of CIB Board with DA14585 Voice RCU PCB inside the Enclosure............... 27
Figure 35: DA14585 Voice RCU Reference Design Enclosure –Top Exploded View....................... 28
Figure 36 : DA14585 Voice RCU Reference Design Enclosure - Side Exploded View...................... 28
Figure 37: Debug Interface.................................................................................................................. 29
Figure 38: IDC-10 Programming/Debugging Cable Installation.......................................................... 29
Figure 39: Communication Interface Board (CIB)............................................................................... 30
Figure 40: Connection of the DA14585 Voice RCU PCB to the CIB Programming Board................. 31
Figure 41: Power ON/OFF Switch Position for Scenario 1 (Green Arrow: ON).................................. 32
Figure 42: Power ON/OFF Switch Position for Scenario 2 (Green Arrow: JTAG) .............................. 32
Tables
Table 1: DA14585 Voice RCU Reference Design Rev. B - Pin Assignment ...................................... 10
Table 2: Y1 (16 MHz Crystal) Characteristics..................................................................................... 12
Table 3: Y2 (32 kHz Crystal) Characteristics ...................................................................................... 12
Table 4: BMI160 Inertial Sensor - Electrical Characteristics............................................................... 15
Table 5: Printed Antenna Performance Characteristics...................................................................... 19
Table 6: DA14585 Voice RCU Reference Design............................................................................... 25

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1 Terms and Definitions
APDU Application Protocol Data Unit
BLE Bluetooth low energy
BOM Bill Of Materials
CIB Communication Interface Board
DCXO Digitally Controlled Crystal Oscillator
ESR Equivalent Series Resistance
HW hardware
IFA Inverted-F Antenna
IR InfraRed
JTAG Joint Test Action Group (test interface)
LED Light Emitting Diode\
PCM Pulse Code Modulation
PDM Pulse Density Modulation
RCU Remote Control Unit
RF Radio Frequency
SoC System On Chip
SPI Serial Peripheral Interface
UART Universal Asynchronous Receiver/Transmitter
USB Universal Serial Bus
2 References
[1] DA14585 datasheet, Dialog Semiconductor.
[2] Application Note : ''Designing Printed Antennas for Bluetooth® Low Energy''
3 Introduction
Bluetooth low energy remote control units (RCU) are becoming the standard in next-generation
Smart TVs and set-top boxes as they improve the user experience by enabling 2-way communication
as well as non-line-of-sight communication to control equipment that is placed behind a door or a
piece of furniture, or in another room.
The Dialog Voice RCU reference design builds on its best-in-class Bluetooth low energy solution, the
DA14585, to deliver an RCU with world-leading battery lifetime and a very small Bill of Materials.

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4 System Overview
4.1 Features
■Highly integrated Dialog Semiconductor DA14585 Bluetooth® Smart SoC
■Stand-alone module
■Low BOM due to printed antenna
■Low cost PCB
■Integrated keypad
■Combined accelerometer/gyroscope sensor unit
■Separate trackpad/wheel modules
■Access to processor via JTAG and UART from the enclosure
4.2 Block Diagram
DA14585
Keypad
Flash
Memory Buzzer
BMI160
Accelerometer/
Gyro
Microphone Battery
Reset
Button On/Off
Switch Debugging Header
XTAL
32 kHz
XTAL
16 MHz
SPI
Row 1-4
Col 1-3
JTAG
UART SPI
Printed
Antenna
VBAT
Trackpad/Wheel
Daughterboard
incl. Azoteq
Touch Controller
(IQS572)
I2C
PDM
Figure 1: Top Level Block Diagram of the DA14585 Voice RCU Reference Design

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4.3 PCBA Overview
IR LED
DA14585
Reset
Button
MIC
Trackpad
sockets
Power
On/OFF
switch
Keypad
BMI160
Accelerometer
/Gyro
ANT1
AAA
Battery
Holder
Figure 2: DA14585 Voice RCU
Reference Design (Rev B) -
Top View
Figure 3: DA14585 Voice RCU
Reference Design (Rev B) -
Bottom View
Buzzer
JTAG
connector

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Figure 4: Trackpad Daughterboard (Rev B) –Top View
Figure 5: Trackpad Daughterboard (Rev B) –Bottom View

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Figure 7: Complete DA14585
Voice RCU Reference Design
(Rev B) with Trackpad
Figure 6: Complete DA14585
Voice RCU Reference Design
(Rev B) with Track Wheel

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5 DA14585 Voice RCU Reference Design
5.1 DA14585 SoC
The DA14585 integrated circuit is an optimized version of the DA14580, offering a reduced boot time
and supporting up to eight 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 device is optimized for remote control units (RCU) requiring support for voice commands and
motion/gesture recognition. Its integrated Audio Unit (AU) offers an easy interface for MEMS
microphones over PDM, external codecs over PCM/I2S and a Sample Rate Converter unit.
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.
Figure 8: DA14585 System Schematic

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5.2 Pin Assignment
Table 1 shows the pin assignment and related pin names on the QFN40 package of the DA14585.
Table 1: DA14585 Voice RCU Reference Design Rev. B - Pin Assignment
DA14585 QFN40 Pin Name
Reference Design Signal
Section
P0_0
SPI_CLK
SPI clock (Flash memory)
P0_1
COL_2
Keypad
P0_2
COL_3
Keypad
P0_3
SPI_CS
SPI chip select (Flash memory)
P0_4
UTX
UART transmit signal
P0_5
URX /
SPI_MISO
UART receive signal /
SPI data in (Flash memory
and accelerometer/gyro)
P0_6
SPI_MOSI
SPI data out (Flash memory
and accelerometer/gyro)
P0_7
BUZ_EN
Enables buzzer
P1_0
PDM_DATA
Audio interface (Mic)
P1_1
PDM_CLK
Audio interface (Mic)
P1_2
Red LED
Programming LED indication
P1_3
Green LED
Keypad/trackpad operation indication
P2_0
IR LED
IR LED
P2_1
ROW_1
Keypad
P2_2
ROW_1
Keypad
P2_3
ROW_1
Keypad
P2_4
ROW_1
Keypad
P2_5
SDA
I2C data (Touch pad controller)
P2_6
SCK
I2C clock (Touch pad controller)
P2_7
RDY
Data ready (Touch pad controller)
P2_8
COL_1
Keypad
P2_9
SPI_CS1
Accelerometer/gyro chip select
P3_0
INT1_BMI
Accelerometer/gyro interrupt pin

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5.3 Power Management
The DA14585 SoC power management subsystem consists of:
●VBAT1V: INPUT. Battery connection. Used for an Alkaline or a NiMh battery (1.5 V). Power input
in boost configuration only. For buck configuration, this pin is shorted to GND.
●VBAT3V: INPUT/OUTPUT. Battery connection for a single coin battery (3 V) or dual AAA
batteries (2x 1.5 V). Power input in buck configuration only.
●SWITCH: INPUT/OUTPUT. Connection for the external inductor of the DC-DC converter.
●VDCDC: Output of the DC-DC converter.
●VDCDC_RF: Supply input of the Bluetooth radio.
●VDD: INPUT. This pin is used for testing purposes only.
Power supply of the DA14585 Voice RCU reference design:
●Battery type: Two standard AAA batteries (non-rechargeable).
●DC-DC converter: The internal DC-DC converter has been configured to operate in Buck mode.
●Power ON/OFF switch: This reference design is equipped with a power ON/OFF switch.
●VDCDC –VDCDC_RF track length: The PCB track between the VDCDC_RF and VDCDC pins
should be at least 7 mm long.
5.4 Flash Memory
Figure 9: Serial NOR Flash Memory
The DA14585 uses an external Serial NOR Flash memory for mirroring its contents to RAM and
execute. The Flash memory type used is MX25R2035:
●2 Mbit QSPI Flash memory, operated in single I/O mode
●Operating voltage: 1.65 V to 3.6 V for read, erase and program operations
Please notice that a pull-up resistor was added on the chip select pin. The reason is that during
power-up and power-down, pin CS# needs to follow the voltage applied to pin VCC to keep the
device not selected.

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5.5 Crystal Oscillators
The DA14585 SoC has two Digitally Controlled Crystal Oscillators (DCXO), one at 16 MHz
(XTAL16M) and a second at 32.768 kHz (XTAL32K). The 32.768 kHz oscillator has no trimming
capabilities and is used as the clock for the Extended/Deep Sleep modes. The 16 MHz oscillator can
be trimmed.
The crystals used on the DA14585 Voice RCU reference design are specified in Table 2 and Table 3.
Table 2: Y1 (16 MHz Crystal) Characteristics
Reference Designator
Value
Part Number
7M-16.000MEEQ-T
Frequency
16 MHz
Accuracy
±10 ppm
Load Capacitance (CL)
10 pF
Shunt Capacitance (C0)
3 pF
Equivalent Series Resistance (ESR)
100 Ω
Drive Level (PD)
50 W
Table 3: Y2 (32 kHz Crystal) Characteristics
Reference Designator
Value
Part Number
ABS07-120-32.768KHZ-T
Frequency
32.768 kHz
Accuracy
±20 ppm
Load Capacitance (CL)
6 pF
Shunt Capacitance (C0)
1.2 pF
Equivalent Series Resistance (ESR)
55-60 kΩ
Drive Level (PD)
0.1 to 0.5 W

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5.6 Microphone
The SPK0838HT4H-B from Knowles is a miniature, high performance, low power, top port silicon
digital microphone with a single-bit PDM output. Its power consumption during sleep is only 4.6 A.
Figure 10: SPK0838HT4H Microphone Schematic

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5.7 Capacitive Touch Controller
The trackpad of the DA14585 voice RCU reference design is equipped with a capacitive touch and
proximity controller IQS572 from Azoteq while the wheel pad is using the IQS263 from same vendor.
These controllers have the ability to sense touch and are accessible by the DA14585 via the I2C
interface.
Figure 11: Capacitive Touch Controller Schematic (Trackpad)
Figure 12: Capacitive Touch Controller Schematic (Wheel)

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5.8 Accelerometer/Gyroscope Sensor
The DA14585 Voice RCU reference design includes the BMI160 Combined Inertial Measurement
Unit and Accelerometer sensor module from Bosch SensorTec.
The BMI160 is a low-power, low-noise inertial measurement unit, designed for use in mobile and
indoor applications which require highly accurate, real-time sensor data. In full operation mode, with
the accelerometer and gyroscope enabled, the current consumption is typically 950 A, while this is
dropped down to 3 A is suspend mode. The BMI160 module is connected to the DA14585 via an
SPI interface.
Figure 13: BMI160- Inertial Sensor Schematic
Table 4: BMI160 Inertial Sensor - Electrical Characteristics
Parameter
Min
Typ
Max
Unit
Supply Voltage (VDD)
1.71
3.0
3.6
V
Supply Voltage (VDD I/O)
1.2
2.4
3.6
V
Voltage Input Low Level
0.3*VDD I/O
V
Voltage Input High Level
0.7*VDD I/O
V
Voltage Output Low Level
0.2*VDD I/O
V
Voltage Output High Level
0.23*VDD I/O
V
Operating Temperature
-40
85
°C

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5.9 Infrared LED
The DA14585 voice RCU reference design employs the WP7113F3BT IR LED from Kingbright.
A Schottky diode NSVR0240V2T1G is used to ensure that no current will be reflected back to
battery. The IR LED is driven by the P2_0 GPIO via a transistor switch.
Figure 14: IR LED Schematic
5.10 Buzzer
The DA14585 Voice RCU reference design employs the CSS-I4B20-SMT magnetic buzzer
transducer from CUI INC. The buzzer is driven by the P0_7 GPIO via a transistor switch.
Figure 15: Buzzer Schematic

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5.11 ON/OFF Switch
Figure 16: Power ON/OFF Switch Schematic
The DA14585 Voice RCU reference design is equipped with a two-position ON/OFF switch, which
selects the system to be powered by the battery or via the JTAG supply.
5.12 LEDs
Figure 17: Indication LEDs Schematic
The DA14585 Voice RCU reference design is equipped with a Red LED (D5) and a Green LED (D6),
which are used to indicate programming and keypad/trackpad operations, respectively. The Red LED
is controlled by GPIO P1_2, the Green LED by GPIO P1_3.

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5.13 Reset Button
Figure 18: Reset Button Schematic and Actual Illustration
The DA14585 Voice RCU reference design employs a reset button (SW37) for applying a hard reset
of the DA14585 SoC.
5.14 Keypad Matrix
Figure 19: Keypad Matrix Schematic
The DA14585 Voice RCU reference design uses a fully configurable 3 columns by 4 rows keypad
matrix.

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5.15 Printed Antenna
Figure 20: PCB view of a printed antenna
Figure 21: Printed Antenna Radiation Pattern
Printed antennas are low cost, easy to manufacture and provide diversity in polarization.
The antennas used in this reference design was based on the Designing Printed Antennas for
Bluetooth® Low Energy application note.
Figure 21 shows the radiation pattern of the printed IFA antenna used in the DA14585 Voice RCU
reference design. The antenna performance is summarized in Table 5.
Table 5: Printed Antenna Performance Characteristics
Parameter
Vertical Polarization
Horizontal Polarization
Peak Power [dBm]
-1.617
-2.565
Average EIRP [dBm]
-4.34000333
-6.24978
Total Radiated Power [dBm]
-2.18045194
-1.9
-40
-30
-20
-10
0
0000000000
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
00
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
000000000
Standing [dBm]
vertical polarization
horizontal polarization
total

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6 Schematics
Figure 22: DA14585 Voice RCU Reference Design Rev. B1 - SoC, Flash Memory, Debugging Port