Dialog Semiconductor SmartBond DA14585 User manual

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User Manual
DA14585 IoT Multi Sensor
Development Kit Hardware
Design
UM-B-095
Abstract
This document describes the hardware design of DA14585 IoT Multi Sensor development kit, which
is based on Dialog Semiconductor’s DA14585 Bluetooth® Low Energy SoC. This development kit
includes an accelerometer/gyro sensor, digital microphone, Gas (CO2) sensor, and an infrared
proximity combined with an ambient light sensor in a single package.

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Contents
Abstract................................................................................................................................................ 1
Contents............................................................................................................................................... 2
Figures.................................................................................................................................................. 3
Tables ................................................................................................................................................... 4
1 Terms and Definitions................................................................................................................... 5
2 References..................................................................................................................................... 5
3 Introduction.................................................................................................................................... 6
4 System Overview........................................................................................................................... 6
4.1 Features................................................................................................................................ 6
4.2 Block Diagram....................................................................................................................... 7
4.3 PCBA Overview .................................................................................................................... 8
5 DA14585 IoT MSK.......................................................................................................................... 9
5.1 DA14585 SoC ....................................................................................................................... 9
5.1.1 DA14585 Pin Assignment.................................................................................... 10
5.1.2 DA14585 Power Pins........................................................................................... 12
5.2 Flash Memory ..................................................................................................................... 12
5.3 Crystal Oscillators ............................................................................................................... 13
5.4 Power Amplifier................................................................................................................... 14
5.4.1 Control Signals .................................................................................................... 15
5.4.1.1 RF Control Signals........................................................................... 15
5.4.1.2 Power Control Signals..................................................................... 16
5.5 Microphone ......................................................................................................................... 17
5.6 GPO Expander.................................................................................................................... 17
5.7 Expansion Slots .................................................................................................................. 18
5.8 Accelerometer/Gyroscope Sensor...................................................................................... 19
5.8.1 Additional (Non-Populated) Motion Sensor......................................................... 20
5.9 Ambient Light and IR Proximity Sensor .............................................................................. 21
5.10 Buzzer................................................................................................................................. 22
5.11 Electronic Compass (Magnetometer) ................................................................................. 23
5.12 Environmental and Gas Sensor.......................................................................................... 24
5.13 Barometric Pressure Sensor............................................................................................... 26
5.14 System Power Supply Options ........................................................................................... 27
5.14.1 Battery Power Options......................................................................................... 27
5.14.2 Alternative Power Options................................................................................... 29
5.15 Printed Antennas................................................................................................................. 29
6 Schematics................................................................................................................................... 31
7 PCB Layout.................................................................................................................................. 32
8 Power Measurements ................................................................................................................. 33
9 Enclosure..................................................................................................................................... 37

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9.1 Adjust IR Proximity Sensor Performance inside the Enclosure.......................................... 38
10 Configuration of the Debugging Interface................................................................................ 41
Revision History ................................................................................................................................ 43
Figures
Figure 1: Block Diagram of DA14585 IoT MSK from Top Level............................................................ 7
Figure 2: PCBA of a DA14585 IoT MSK: Top view............................................................................... 8
Figure 3: PCBA of DA14585 IoT MSK: Bottom View............................................................................ 9
Figure 4: The System Schematic of DA14585 SoC............................................................................ 10
Figure 5: Serial NOR Flash Memory................................................................................................... 13
Figure 6: Block Diagram of the SKY66111-11 Power Amplifier.......................................................... 15
Figure 7: Schematic of SKY66111-11 Front End Module ................................................................... 15
Figure 8: Schematic of SPK0838HT4H Microphone........................................................................... 17
Figure 9: Schematic of GPO Expander............................................................................................... 18
Figure 10: Schematic of Expansion Slots............................................................................................ 19
Figure 11: Schematic of ICM42605 Motion Sensor ............................................................................ 20
Figure 12: Schematic of the Ambient Light and IR Proximity Sensor ................................................. 21
Figure 13: Buzzer Schematic .............................................................................................................. 22
Figure 14: Frequency Response versus dB Magnitude...................................................................... 23
Figure 15: Schematic of the Magnetic Sensor .................................................................................... 24
Figure 16: Schematic of the Environmental and Gas Sensor............................................................. 25
Figure 17: Schematic of Barometric Sensor........................................................................................ 27
Figure 18: Power ON/OFF Switch and Power Options....................................................................... 28
Figure 19: BT2, Coin Cell Battery Holder Position.............................................................................. 29
Figure 20: The Printed IFA of a Reduced Size on PCB...................................................................... 30
Figure 21: Radiation Pattern of the Printed IFA of a Reduced Size.................................................... 30
Figure 22: Schematic 1 of DA14585 IoT MSK .................................................................................... 31
Figure 23: Schematic 2 of DA14585 IoT MSK .................................................................................... 31
Figure 24: PCB of the DA14585 IoT MSK: Top View.......................................................................... 32
Figure 25: PCB of DA14585 IoT MSK: Bottom View .......................................................................... 33
Figure 26: DA14585 Disconnected, All Sensors in Sleep Mode......................................................... 34
Figure 27: DA14585 Connected, All Sensors Active........................................................................... 34
Figure 28: DA14585 Connected, Gas Sensor Off Only ...................................................................... 35
Figure 29: DA14585 Connected, Environmental and Gas Sensor OFF ............................................. 35
Figure 30: DA14585 Connected, Environmental, Gas, ALS and IR Sensors OFF............................. 36
Figure 31: DA14585 Connected, Motion Sensor ON Only.................................................................. 36
Figure 32: DA14585 IoT MSK Enclosure: Top View........................................................................... 37
Figure 33: DA14585 IoT MSK Enclosure: Bottom View...................................................................... 38
Figure 34: DA14585 IoT MSK Enclosure: Side View.......................................................................... 38
Figure 35: Reading Panel of Dialog IoT Sensors App ........................................................................ 38
Figure 36: Menu Panel of Dialog IoT Sensors APP............................................................................ 39
Figure 37: Settings Menu of Dialog IoT Sensors App......................................................................... 40
Figure 38: Choices of Basic Settings in Dialog IoT Sensors App ....................................................... 40
Figure 39: Suggested Values of Proximity Hysteresis to Adjust IR Proximity Performance......... Error!
Bookmark not defined.
Figure 40: Communication Interface Board (CIB)............................................................................... 41
Figure 41: Connection between DA14585 IoT MSK and the CIB ....................................................... 42

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Tables
Table 1: GPIO Pin Assignment for DA14585 IoT MSK....................................................................... 10
Table 2: Y1 (16 MHz Crystal) Characteristics..................................................................................... 13
Table 3: Y2 (32 kHz Crystal) Characteristics ...................................................................................... 14
Table 4: Truth Table for SKY66111-11 ............................................................................................... 16
Table 5: Signal Configurations for Power Control............................................................................... 16
Table 6: GPO Expander Pin Assignment............................................................................................ 17
Table 7: Indicative Electrical Characteristics of ICM42605 Motion Sensor......................................... 20
Table 8: Motion Sensor Mounting Scenarios ...................................................................................... 21
Table 9: Indicative Electrical Characteristics of VCNL4010 ALS and IR Sensor................................ 22
Table 10: Indicative Electrical Characteristics of AK09915C Magnetic Sensor.................................. 24
Table 11: Indicative Electrical Characteristics of BME680.................................................................. 26
Table 12: Indicative Electrical Characteristics of ICP10110................................................................ 27
Table 13: Collective Table for Current Measurement ......................................................................... 37

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1 Terms and Definitions
ALS Ambient Light Sensor
APDU Application Protocol Data Unit
AVG Average
BLE Bluetooth Low Energy
BOM Bill of Materials
CIB Communication Interface Board
DCXO Digitally Controlled Crystal Oscillator
e-CO2 Equivalent CO2
ESR Equivalent Series Resistance
FW Firmware
HW Hardware
IAQ Indoor Air Quality
IFA Inverted-F Antenna
IR Infrared
IoT Internet of Things
JTAG Joint Test Action Group (test interface)
LED Light Emitting Diode
L2CAP Logical Link Control and Adaptation Layer Protocol
MSK Multi Sensor development kit
NP Non-Populated
PA Power Amplifier
PCM Pulse Code Modulation
PDM Pulse Density Modulation
RF Radio Frequency
SoC System on Chip
SIG Special Interest Group
SPI Serial Peripheral Interface
UART Universal Asynchronous Receiver/Transmitter
USB Universal Serial Bus
VOC Volatile Oxide Compound
2 References
[1] DA14585, Datasheet, Dialog Semiconductor.
[2] AN-B-027, Designing printed antennas for Bluetooth® Smart, Application Note , Dialog
Semiconductor
[3] AN-B-054, DA14585 Application Hardware Design Guidelines, Application Note , Dialog
Semiconductor
[4] UM-B-089, DA14585 Range Extender Reference Application, User Manual, Dialog
Semiconductor.
[5] UM-B-096, DA14585 IoT Multi Sensor Development Kit Software Reference Application, User
Manual, Dialog Semiconductor.

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3 Introduction
Today’s Internet of Things (IoT) market is extremely vibrant and promising. Various applications keep
appearing on the market. They are expected to contain as many sensors as possible while
consuming minimum power. Dialog's DA14585 IoT Multi Sensor development kit (MSK) uses
components that consume low power and allows the development of IoT applications to offer a wide
range of products and to react to the market fast. Using this development kit, users can develop
numerous applications using the same hardware and support different use cases through the same
firmware.
This document describes the hardware design for DA14585 IoT MSK. To learn about the architecture
and configuration of the software reference applications, please refer to [5].
4 System Overview
4.1 Features
■Highly integrated DA14585 Bluetooth® Smart SoC from Dialog Semiconductor
■Stand-alone module
■Low cost due to printed antenna
■Low cost PCB
■Combined accelerometer/gyroscope sensor unit
■Combined sensors:
□Accelerometer and gyroscope sensor unit
□Gas and environmental (Temperature, Humidity and Pressure)
□ALS and IR proximity
■Access to processor via JTAG and UART from the enclosure
■Programmable RF power up to +9.3 dBm
■Three LED indicators
■General purpose push button
■Expansion slots
■Powered by two low cost AAA alkaline batteries

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4.2 Block Diagram
DA14585 BLE SoC
VCNL4010
Proximity IR and
ALS sensor
MX25R2035
Flash
ICM-42605
Accelerometer
/Gyro
SPK0838HT4H
Microphone Power
ON/OFF
switch
Debugging
Header
XTAL
32KHz
XTAL
16MHz
QSPI
UART,JTAG
SPI
Printed
antenna
VBAT
BME680
Environmental &
gas (CO2) sensor I2C
PDM
+
DCDC
converter
3.0V à1.8V
1.8V
Optional power
scheme,NP
Buzzer,
Push
button
GPIO
VBAT
SKY66111
Power
Amplifier
2X5, 2.54mm
connector
providing GPIO
2X4, 2.54mm
connector
providing I2C
and SPI
expandability
I2C
I2C, SPI,CS
3.0V
ICP10110
Absloute
pressure
sensor
GPIO
FXL6408UMX
8xGPO
expander
I2C
NP Motion Sensor options
BMI160
Accelerometer
/Gyro
NP
NP
GPO3
GPO2
GPO1
I2C, SPI,CS SPI AK09915C
Magnetic sensor
Figure 1: Block Diagram of DA14585 IoT MSK from Top Level

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4.3 PCBA Overview
Figure 2: PCBA of a DA14585 IoT MSK: Top view

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Figure 3: PCBA of DA14585 IoT MSK: Bottom View
5 DA14585 IoT MSK
5.1 DA14585 SoC
DA14585 SoC is an optimized version of 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 stand-alone application processor or as a data pump in
hosted systems.
The Bluetooth®Low Energy firmware includes L2CAP service layer protocols, Security Manager
(SM), Attribute Protocol (ATT), Generic Attribute Profile (GATT), and Generic Access Profile (GAP).
The firmware also supports all profiles published by the Bluetooth SIG as well as custom profiles.

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Figure 4: The System Schematic of DA14585 SoC
5.1.1 DA14585 Pin Assignment
Table 1 shows GPIO pin assignment of DA14585 IoT MSK and related pin names for GPIO in the
QFN40 package of DA14585.
Table 1: GPIO Pin Assignment for DA14585 IoT MSK
Pin Name
Pin Assignment for GPIO
Comments
P0_0
SPI_CLK
SPI clock (Flash memory)
P0_1
CTRL_TX
PA’s control signal

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Pin Name
Pin Assignment for GPIO
Comments
P0_2
CTRL_RX
PA’s control signal
P0_3
SPI_CS
SPI chip select (Flash memory)
P0_4
UTX
UART transmit signal - Also connected on the
expansion slots J8 and J9
P0_5
SPI_MISO/URX
SPI multiplexed with UART receive signal- Also
connected on the expansion slots J8 and J9
P0_6
SPI_MOSI
SPI
P0_7
GPIOx3
External GPIO pin - To CTRL_PWM_BP via a non-pop
resistor (R288)
P1_0
PDM_DATA
Audio interface (Mic)
P1_1
DRDY_AK09915
Data ready pin for the AK09915 magneto module
P1_2
INT_ICM42605
Interrupt pin for the ICM42605 accelerometer Multi
Sensor gyro module
P1_3
PB1
Push button
P2_0
PDM_CLK
Audio interface (Mic)
P2_1
SPI_CS1
Chip select for the SPI the ICM40605 accelerometer
Multi Sensor gyro module
P2_2
GPIOx
External GPIO pin
P2_3
INT_VCNL4010
Interrupt pin for the VCNL4010 optical sensor module
P2_4
SPI_CS2
Chip select for the SPI, connected to the testing
connector for external use (additional sensor)
P2_5
SDA
I2C data (AK09915 magneto, Optical sensor module,
GPIO expander)
P2_6
SCK
I2C clock (AK09915 magneto, Optical sensor module,
GPIO expander)
P2_7
SPI_CS3
Chip select magneto (AK09915)

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Pin Name
Pin Assignment for GPIO
Comments
P2_8
Buzzer( Multi Sensor)
Buzzer
P2_9
CTRL_PWM
PWM signal for PA power control
P3_0
GPIOx2
External GPIO pin - To the non-populated push button
5.1.2 DA14585 Power Pins
The power management subsystem of DA14585 SoC consists of:
●VBAT1V: INPUT.
○Battery connection 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 (2 × 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.
The power supply of the DA14585 IoT Multi Sensor development kit includes:
●Battery type:
Two standard non-rechargeable AAA batteries.
●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.
●The track length between the VDCDC pin and the VDCDC_RF pin on the PCB should be at least
7 mm long.
5.2 Flash Memory
DA14585 uses an external Serial NOR Flash memory (Figure 5) to mirror its contents to RAM and
execute the content. The Flash memory type used is MX25R2035FZUIL0:
●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
●8USON package

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Please notice that a pull-up resistor has been added on the chip select (CS) pin. The reason is that
during power-up and power-down, the pin CS needs to follow the voltage applied to the pin VCC to
keep the device not selected.
Figure 5: Serial NOR Flash Memory
5.3 Crystal Oscillators
DA14585 SoC has two Digitally Controlled Crystal Oscillators (DCXO), one at 16 MHz (XTAL16M)
and the other at 32.768 kHz (XTAL32K). XTAL32K has no trimming capabilities and is used as the
clock for the Extended/Deep Sleep modes. XTAL16M can be trimmed.
The crystals used on the DA14585 IoT Multi Sensor development kit 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 µW

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Table 3: Y2 (32 kHz Crystal) Characteristics
Reference Designator
Value
Part Number
ABS06-32.768KHz-9-T
Frequency
32.768 kHz
Accuracy
±20 ppm
Load Capacitance (CL)
9 pF
Shunt Capacitance (C0)
1.2 pF
Equivalent Series Resistance (ESR)
90 kΩ
Drive Level (PD)
0.1 to 0.5 µW
5.4 Power Amplifier
The amplifier circuit is the SKY66111-11 from Skyworks. 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: 10 mA
■RX sensitivity: SoC Multi Sensor1 (see Note 1)
■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 1 The FEM presents around 1dB insertion loss compared to the case where no PA is used.

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Figure 6: Block Diagram of the 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 (Figure 6).
The SKY66111-11 BIAS pin supplies the bias to the internal PA (Figure 6). 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 (Figure 7),
providing a constant voltage, VBIAS, of 1.8 V when the PA is enabled. The resistor value is adjusted
so that the maximum 9.3 dBm output power is achieved.
Figure 7: Schematic of SKY66111-11 Front End Module
5.4.1 Control Signals
5.4.1.1 RF Control Signals
The SKY66111-11 is controlled by CTX and CRX control signals. Their functionality is explained in
Table 4.

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Table 4: 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 2)
Non-permissible state
(See Note 3)
1
1
X
Note 2 Analog voltage control for PA output power.
Note 3 This state will enable both the TX and RX paths. It is not permitted to operate in this state.
5.4.1.2 Power Control Signals
An external circuit is used to adjust the voltage level of the VCC power supply pin in SKY66111-11.
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:
●Programmable Output Power Mode:
○A PWM signal with programmable duty cycle drives the external circuit.
○The system operates in the range of 0 to +8 dBm by steps of 0, 2, 4, 6, and 8 dBm defined by
the used duty cycle.
●Maximum Output Power Mode:
○The system operates at the maximum power (+9.3dBm) as defined by the RBIAS.
●Bypass Mode: the PA is bypassed.
To configure the programmable output power mode and the maximum output power mode, 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 (Accessed via the GPO expander)
To configure the bypass mode, the CTX and CRX inverted signals are used (see Note 4).
The signal configuration for each mode are described in Table 5.
Table 5: Signal Configurations for Power Control
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 4)
1 (see Note 4)

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Note 4 CTX and CRX are configured as normal GPIO and not extracted from the diagnostic port. CTX is
configured LOW and CRX HIGH during transmission.
5.5 Microphone
The SPK0838HT4H-B from Knowles is a miniature, high performance, low power, and top port silicon
digital microphone with a single-bit PDM output.
Due to its high power consumption at sleep mode, it is supplied via a dedicated GPO from the GPIO
expander.
Figure 8: Schematic of SPK0838HT4H Microphone
5.6 GPO Expander
Due to the high GPO demand in this reference design, a GPO expander is necessary. The used
component is the low-power, I2C-controlled FXL6408UMX from Fairchild. It uses both power rails of
1.8 V and 3.3 V while its power consumption remains very low at only 1.5 µA (Sleep current).
Table 6: GPO Expander Pin Assignment
GPO Expander Pin
(FXL6408UMX)
Pin description
Comments
GPO 0
LED YELLOW
LED
GPO 1
MIC_SUP
Supply voltage for the PDM microphone
GPO 2
LED RED
LED
GPO 3
CTRL_PWM_BP
Controlling PA max power
GPO 4
LED GREEN
LED

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GPO 5
GPO_EXT1
GPO for usage connected to the expansion slot
GPO 6
GPO_EXT2
GPO for usage connected to the expansion slot
GPO 7
GPO_EXT3
GPO for usage connected to the expansion slot
Figure 9: Schematic of GPO Expander
5.7 Expansion Slots
DA14585 IoT MSK features two connection slots (J18 and J19) of a standard 2.54 mm pitch that
enables developers to connect additional peripheral and sensors modules as it outputs the SPI with
dedicated chip select SPI_CS2 and I2C interface. To provide users with programming and debugging
capabilities, the JTAG/UART P0_4 and P0_5 GPIOs are also mapped on the J18 slot. Three spare
DA14585 GPIOs and three from the GPO expander are also connected on these expansion slots.
These are described in Table 1 and Table 6.

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Figure 10: Schematic of Expansion Slots
5.8 Accelerometer/Gyroscope Sensor
The DA14585 IoT MSK employs the ICM42605 motion sensor from TDK Invensense that combines a
3-axis gyroscope and a 3-axis accelerometer.
The ICM42605 features a 2 kB FIFO memory that can reduce the traffic on the serial bus interface
and thus reduce power consumption, allowing the system processor to burst read sensor data and
then go into a low-power mode.
The gyroscope supports eight independently-programmable full-scale range settings from ±15.625
dps to ±2000 dps, and the accelerometer supports four independently programmable full-scale range
settings from ±2 g to ±16 g.
In full operation mode with the accelerometer and gyroscope enabled, the current consumption is
typically 0.72 mA, while it drops down to 11 µA in sleep mode.
The ICM42605 module is connected to DA14585 via an SPI interface which supports speeds up to
24 MHz.

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Figure 11: Schematic of ICM42605 Motion Sensor
Table 7: Indicative Electrical Characteristics of ICM42605 Motion Sensor
Parameter
Min
Typ
Max
Unit
Supply Voltage (VDD)
1.71
1.8
3.6
V
Supply Voltage (VDD I/O)
1.71
1.8
3.6
V
Supply Currents
6-Axis Gyroscope Multi Sensor
Accelerometer
0.72
mA
3-Axis Accelerometer
0.24
mA
3-Axis Gyroscope
0.57
mA
Sleep mode
11
uA
Temperature
Operating Temperature
-40
85
°C
5.8.1 Additional (Non-Populated) Motion Sensor
For additional flexibility, the DA14585 IoT MSK is equipped with an additional PCB footprint (U11 as
shown in Figure 24) of an alternative accelerometer/gyroscope sensor. This corresponds to the part
number BMI160 of gyroscope/accelerometer from Bosch Sensortec. The SPI bus is shared with the