Renesas OB1203SD-BT2-EVK User manual

Evaluation Kit Manual
OB1203SD
-BT2-EVK
Evaluation K
it for Heart Rate, SpO2, and Respiration Rate
R36UH0005EU0100 Rev.1.00
Nov 19, 2021
Page 1
© 2021 Renesas Electronics
The OB1203SD-BT2-EVK evaluation kit for Heart
Rate, SpO2, and Respiration Rate uses Renesas’
highly integrated OB1203 biosensor for reflective
photoplethysmography.
With the provided algorithm, the kit can determine
Heart Rate, Oxygen Saturation (SpO2), and
Respiration Rate. Data can be monitored locally by
connecting a USB cable between the EVK and a
computer and using a terminal program. Data is also
sent by a wireless Bluetooth (BLE) link and available
for monitoring using the Renesas OB1203 Web App
running on a Windows™ v10 or later PC.
The design incorporates a Dialog DA14531MOD
SmartBond TINY™ Module for MCU+BLE capability
and a Renesas ISL9111 DC-DC boost converter.
Functions
■Collects data from Renesas OB1203 sensor
module through I2C communication
■Calculates the oxygen saturation, pulse, and
respiration rate using the provided algorithm
■Reports oxygen saturation, pulse, and respiration
rate raw data and tabular summary values plus
battery level
■Boosts battery voltage to system’s voltage needs
Target Devices
■MCU+BLE: Dialog DA14531MOD module
■Sensor: OB1203 module
■Boost: ISL9111 (ISL9111EH33Z)
When applying the provided algorithm to another
microcontroller, modify the program to the
specifications for the target microcontroller and
conduct an extensive evaluation of the modified
program. Changes in analog or power supply
components also must be fully evaluated.
Specifications
The OB1203SD-BT2-EVK monitors heart rate, blood
oxygen saturation, and respiration rate. Battery-
operated and portable, the evaluation kit is suitable
for monitoring at home, during exercise, or travel.
■Operating voltage: 3.0V (AAA battery × 2)
■Measurement range: Oxygen saturation: 70% to
100%
■Pulse rate: 25 to 200 bpm
■Operating temperature: -40 to 85°C
■Operating humidity: 5 to 99% RH (No condensate
water)

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Contents
1. Functional Description.................................................................................................................................. 3
1.1 DA14531MOD SmartBond TINY™ MCU+BLE Module........................................................................ 3
1.1.1. DA14531MOD Key Features .................................................................................................. 5
1.2 OB1203 Photoplethysmography Sensor ............................................................................................... 6
1.2.1. OB1203 Key Features............................................................................................................. 6
1.3 ISL9111 DC-DC Boost........................................................................................................................... 7
1.3.1. ISL9111 Key Features ............................................................................................................ 7
1.4 Setup and Configuration........................................................................................................................ 8
2. Board Design.................................................................................................................................................. 9
2.1 Functional Description........................................................................................................................... 9
2.2 Layout.................................................................................................................................................... 9
2.3 Schematic............................................................................................................................................ 10
2.4 Bill of Materials .................................................................................................................................... 12
2.5 PCB Fabrication................................................................................................................................... 13
3. Custom Programming................................................................................................................................. 14
4. Renesas Algorithm...................................................................................................................................... 17
4.1 Main Process....................................................................................................................................... 17
4.2 OB1203 Module Routines ................................................................................................................... 18
5. Ordering Information................................................................................................................................... 19
6. Notice............................................................................................................................................................ 19
7. Revision History .......................................................................................................................................... 19
Figures
Figure 1. DA14531 SmartBond TINY Module Block Diagram..................................................................................3
Figure 2. DA14531MOD (16) Pin Configuration.......................................................................................................4
Figure 3. OB1203 Typical Application Circuit............................................................................................................6
Figure 4. ISL9111 Typical Application Circuit...........................................................................................................7
Figure 5. OB123SD-BT2-EVK Measurement...........................................................................................................8
Figure 6. OB1203SD-BT2-EVK Board Layout..........................................................................................................9
Figure 7. OB1203SD-BT2-EVK Schematic – Page 1.............................................................................................10
Figure 8. OB1203SD-BT2-EVK Schematic – Page 2.............................................................................................11
Figure 9. OB1203SD-BT2-EVK PCB Fabrication Drawing ....................................................................................13
Figure 10. OB1203SD-BT2-EVK with MCU Programming Adapter.......................................................................14
Figure 11. Smart Snippets Toolbox for Loading Initial Multi-image Code to the HW DUT.....................................15
Figure 12. Smart Snippets Toolbox for Loading Initial Multi-image Code to the DUT............................................15
Figure 13. Smart Snippets Toolbox for Loading Initial Multi-image Code to the DUT............................................16
Figure 14. Main Processing Routine ......................................................................................................................17
Figure 15. User Initialization Routine......................................................................................................................17
Figure 16. PPG Measurement Routine ..................................................................................................................18

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1. Functional Description
1.1 DA14531MOD SmartBond TINY™ MCU+BLE Module
The SmartBond TINY™ Module is based on the Dialog Semiconductor DA14531 SoC configured in buck mode.
With an integrated 1Mbit flash, 32MHz XTAL and a printed antenna, the module enables a faster time to market
at reduced development costs.
The module is comprised of the following (see also Figure 1):
■1Mbit SPI FLASH
■32MHz XTAL
■2 decoupling capacitors
■A power inductor
■A CLC filter and matching components for the printed antenna
Figure 1. DA14531 SmartBond TINY Module Block Diagram

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Figure 2 shows the pin configuration of the DA14531MOD (32-pin products).
Figure 2. DA14531MOD (16) Pin Configuration

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1.1.1. DA14531MOD Key Features
■
Bluetooth
●Compatible with Bluetooth® v5.1, ETSI EN 300 328
and EN 300 440 Class 2 (Europe), FCC CFR47
Part 15 (US) and
ARIB STD-T66 (Japan) core
●Supports up to 3 connections
●Dialog Semiconductor registered BD address
preprogrammed in OTP
■Processing and memories
●16 MHz 32-bit Arm® Cortex® M0+ with
SWD
interface
●128 Kbytes internal FLASH
●48 Kbytes RAM
●144 Kbytes ROM
●32 Kbytes OTP
■CurrentConsumption
●2 mA RX at VBAT=3V
●4 mA TX at VBAT=3V and 0 dBm
●1.8 uA at sleep with all RAM retained
■Radio
●Programmable RF transmit power from -19 to +2.2
dBm
●-93 dBm receiver sensitivity
■Interfaces
●Quadrature decoder with 3 channels
●4 channel 11-bit ENOB ADC
●2 general purpose timers with PWM
●9 GPIOs
●SPI
●2x UART, 1wire UART support
●I2C
■
PowerManagement
●Operating range (1.8 V - 3.3 V)
●Inrush current control
■Other
●Real Time Clock
●Trimmed 32 MHz Crystal
■Packaging
●12.5 mm × 14.5 mm × 2.8 mm package
■Module Software Development Kit
●ConfigurableDSPS
●Codeless v2.0
●SDK6 support
■Module Software Tools
●Flash/OTPprogrammer
●SUOTAsupport
●Battery Life Estimation
●Data Rate Monitoring
●Real-Time Power Profiling
●Production Line Testing
■StandardsConformance
●BT SIG QDID 113959
●Europe (CE/RED) and US (FCC)
●Canada and Japan
●South Korea and Taiwan
●South Africa and Brazil
●China and Thailand

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1.2 OB1203 Photoplethysmography Sensor
The OB1203 Sensor Module has a fully integrated sensor for reflective photoplethysmography (PPG), a
proximity sensor (PS), and a multi-channel light sensor (LS/CS, not used in this application). The OB1203
integrates light sources, drivers, sensors, ADC, and I2C interface in a single optically optimized package.
With the provided algorithm, human heart rate (HR), oxygen saturation (SpO2), and respiration rate are
determined.
The following figure shows the typical application circuit of the OB1203.
Figure 3. OB1203 Typical Application Circuit
1.2.1. OB1203 Key Features
1.2.1.1. Biosensor Features
■SpO2 measurement behind visibly dark, IR transmissive ink
■Industry’s smallest optical biosensor module
■Fully integrated and trimmed module, including two LEDs, 250mA maximum drive current, and photodetectors
■Output resolution PPG: 16 to 18 bits
■Data stored in 18-bit wide, 32-sample FIFO memory
■Integrated averaging function for higher signal-to-noise ratio (SNR) and data rate reduction
■Programmable measurement rate: up to 3200 samples per second
■High SNR
1.2.1.2. Biosensor Applications
■Sensor for heart rate, blood oxygen saturation, and respiration rate
■Secondary sensor for blood pressure
■Fitness and wellness, wearable devices
1.2.1.3. Physical Characteristics
■Highly reliable and industry-proven OSIP package with integrated cover glass for hypoallergenic products
■Wide operation temperature: -40 to +85°C
■Wide supply voltage: 1.7V to 3.6V
■Low standby current: 2μA typical
■I2C interface capable of Standard Mode or Fast Mode communication; 1.8V to 3.3V logic compatible
■Programmable level-based interrupt functions with upper and lower thresholds for extending battery life
■Industry’s smallest package: 4.2 × 2 × 1.2 mm3 14-OSIP module

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1.3 ISL9111 DC-DC Boost
The ISL9111 is a high-efficiency synchronous boost converter with a 1A switch. The device provides a power
supply solution for series connected (1.5 + 1.5V = 3V) alkaline battery-powered applications. It guarantees to
supply 100mA when the output is 3.3V. High 1.2MHz switching frequency allows the use of tiny, low-profile
inductors and ceramic capacitors to minimize the size of the solution.
The following figure shows the typical application circuit of the ISL9111.
Figure 4. ISL9111 Typical Application Circuit
1.3.1. ISL9111 Key Features
■Up to 97% efficiency at typical operating conditions
■Low quiescent current: 20μA (typical)
■Logic control shutdown (Iq < 1µA)
■Output disconnect during shutdown
■Skip Mode under light load condition
■Undervoltage lockout (ISL9111 only)
■Fault protection: OVP (ADJ version only), OTP, short circuit
■6 Ld SOT-23 package

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1.4 Setup and Configuration
For more information on setup and configuration, see the Renesas OB1203SD-BT2-EVK Getting Started Guide.
Instructions for updating Renesas supplied code using a computer and the BLE connection are discussed in
“Custom Programming.”
The following figure shows the EVK with plastic finger cradle installed. The cradle optimizes the position of the
finger over the OB1203 sensor.
Figure 5. OB123SD-BT2-EVK Measurement

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2. Board Design
2.1 Functional Description
The OB1203 sensor interrupt triggers the MCU to read the sensor data.
The MCU determines blood oxygen saturation, heart, and respiration rate, and sends the data via I2C to the
DA14531MOD.
The MCU formats data and reports results locally through a USB connection to a computer.
Data is also processed through the DA14531MOD BLE subsystem which advertises as “DLG-OB1203”.
The ISL9111 adjusts the voltage of two AAA batteries to the systems supply needs of 3.3V. The SW1 button
powers on the system.
2.2 Layout
Figure 6. OB1203SD-BT2-EVK Board Layout

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2.3 Schematic
Figure 7. OB1203SD-BT2-EVK Schematic – Page 1
U4 is a UART to USB converter IC.
A single-wire UART is used for connection between the MCU and the FT234 IC.
A 1K pull-up resistor between TXD and RXD is required for the single wire UART.

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Figure 8. OB1203SD-BT2-EVK Schematic – Page 2
The power supply circuit is fed from the battery connected to J2.
The battery connector is a JST-PH2, which is an industry-standard connector for batteries.
The EVK is supplied with a battery holder (2 × AAA in series) Pimoroni P/N COM1304 = Digikey P/N 1778-1223-
ND
SW2 is used to connect/disconnect the battery.
The power supply circuit monitors the state of the push button SW2.
If the switch is pressed for more than 1 second and the battery voltage (VBAT_MON checked by the MCU ADC)
is above 2.5V, the MCU brings the POWER_ON net high and holds the Q2 MOSFET on to connect the battery
output to the boost converter input.
The U1 ISL9111 DC-DC boost converter provides the primary voltage (3.3V) for all ICs.
A boost converter is used so that 3.3V is maintained as the battery drains to voltages lower than the nominal
starting voltage when batteries are new.
The U2 OB1203 communicates to the MCU using the I2C bus.
The OPTICAL_INT net goes high when the OB1203 detects a finger near the sensor. This wakeup prompts the
MCU to begin processing data.
The highly integrated U3 DA14531MOD includes the MCU which uses the Renesas supplied open-source
algorithm for OB1203 measurement processing. The module also includes a globally certified BLE transceiver
with on-board antenna.

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2.4 Bill of Materials
Item
Qty
Part Reference
Description
Manufacturer
Manufacturer P/N
1 2 C1 C4 Capacitor 4.7uF 20% 6.3V X5R 0402 Murata GRM155R60J475ME87J
2 2 C2 C3 Capacitor 0.1 uF 50V 10% X5R 0402 Murata GRM155R61H104KE19D
3 1 C5 Capacitor 4.7uF 20% 10V X5R 0603 Samsung CL10A475KP8NNNC
4 3 C6 C7 C10 Capacitor 0.1uF 10% 6.3V X5R 0201 Murata GRM033R60J104KE19D
5 2 C8 C9 Capacitor 47pF 5% 50V NPO 0201 Murata GRM0335C1H470JA01D
6 2 D1 D3 Diode Schottky 30V 1A B5818LWS-TP SOD323 Micro Commercial B5818LWS-TP
7 1 D2 LED 0402 Red 50mW 20mA 1mA Test Rohm SML-P11UTT86
8 1 D4 Varistor Bus Protector Dual AVX USB0002RP AVX USB0002RP
9 1 FB1 Filter, Ferrite Bead High GHz 470ohm @ 100
MHz,300mA 0402 Murata BLM15GG471SN1D
10 1 FB2 Filter, Ferrite Bead, 120 Ohms @ 100 MHz , 2A,
0603 Murata BLM18EG121SN1D
11 1 J1 Conn Dual Row Header Vert SMD Keyed 2X5
1.27mm pitch Amphenol 20021521-00010T1LF
12 1 J2 Conn Header 2 Pos 2mm R/A TH JST S2B-PH-K-
S(LF)(SN) JST S2B-PH-K-S(LF)(SN)
13 1 J3 Conn USB Receptacle Micro-B IP67 Right Angle
SMD CUI UJ2-MIBH-3-MSMT-TR-67
14 1 L1 Inductor SMT Power 4.7uH 1.2A 150 mohm 20%
3x2.8mm Bourns SDR0302-4R7ML
15 1 Q1 Transistor NPN 25V 1.5A MMSS8050-L-TP SOT-23 Micro Commercial MMSS8050-H-TP
16 1 Q2 Transistor MOSFET DMP3105LVT-7 P-CH 30V 3A
TSOT-23-6 Diodes Inc DMP3105LVT-7
17 1 R1 Res 1500 Ohm 0402 1%
18 5 R2 R5 R14 R16
R18 Res 10.0K Ohm 0402 1%
19 3 R3 R6 R19 Res 1000 Ohm 0402 1%
20 1 R4 Res NP 0402 1%
21 1 R7 Res 0 Ohm 0402
22 1 R8 Res 165K-Ohm 0402 1%
23 1 R9 Res 100K Ohm 0402 1%
24 1 R10 Res 523K-Ohm 0402 1%
25 2 R11 R12 Res 22.1K-Ohm 0402 1%
26 1 R13 Res 10.0K Ohm 0201 1%
27 2 R15 R17 Res 27.4 Ohm 0201 1%
28 1 SW1 Switch Tactile SPST NO SMD PTS 647 SM38
SMTR2 LFS 4.5 ×4.5 ×3.8m C&K PTS 647 SM38 SMTR2 LF
29 1 SW2 Switch Slide SPDT 200mA CL-SB-12B-01T Nidec Copal CL-SB-12B-01T
30 1 U1 IC Switching Reg Boost Adj 240mA
ISL9111EHADJZ-T7A SOT23-6 Renesas ISL9111EHADJZ-T7A
31 1 U2 Optical BioSensing Module OB1203SD LGA-14 4.2
×1 ×1.2mm Renesas OB1203SD
32 1 U3 Module BLE 5.1 Dialog DA14531MOD 14.5
×
12.95
×2.8mm 16Pin Dialog DA14531MOD
33 1 U4 IC USB Serial Basic UART FT234XD-R 12DFN FTDI FT234XD-R
34 1 PCB OBD1203 EVK - Dialog BLE Module
35 1 Battery Holder 2 Cell AAA Wired with JST PH
Connector Pimoroni Ltd COM1305
36 1 Battery Alkaline 1.5V AAA 2 pack FDK LR03 G6 (2S)
37 6 Bumper Cylindrical 0.25" diameter
×
0.063"high
Clear Essentra RBS-40

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2.5 PCB Fabrication
Figure 9. OB1203SD-BT2-EVK PCB Fabrication Drawing

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3. Custom Programming
This section applies to users developing custom code only.
The Renesas/Dialog Keil/Smart Snippets integrated development environment (IDE) is used for custom code
development.
Initial firmware that sets up the multi-image and Software Update Over the Air (SUOTA) capability is loaded into
the target EVK SPI FLASH using Smart Snippets Tool Box.
Note: The RESET connection between the Dialog Communication Interface Board (CIB) / programmer PCA and
the target must be disconnected for proper communication.
The following photo shows the EVK connected to a Dialog Communication Interface Board (CIB) for
programming. The RESET trace was cut on the Dialog interface board at the J5 connector.
The cable between the EVK and the programming adapter is a 2 × 5 1.27 mm ARM plug-to-plug cable (Adafruit
P/N 1675).
Figure 10. OB1203SD-BT2-EVK with MCU Programming Adapter

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Figure 11. Smart Snippets Toolbox for Loading Initial Multi-image Code to the HW DUT
Select JTAG and set ports:
SPI-CLK = P0.4
SPI-CS = P0.1
SPI-MISO = P0.3
SPI-MOSI = P0.0
Figure 12. Smart Snippets Toolbox for Loading Initial Multi-image Code to the DUT
Bootable should be un-checked

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Figure 13. Smart Snippets Toolbox for Loading Initial Multi-image Code to the DUT
Set SPI FLASH memory size = 20000

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4. Renesas Algorithm
4.1 Main Process
Figure 14 and Figure 15 show the flowchart for the ‘main()’ routine and the user initialization routine
‘R_MAIN_UserInit()’.
Figure 14. Main Processing Routine
Figure 15. User Initialization Routine

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4.2 OB1203 Module Routines
The following figure shows the flowchart of the oximeter measure routine.
Figure 16. PPG Measurement Routine

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5. Ordering Information
Part Number
Description
OB1203SD-BT2-EVK
OB1203SD-BT2-EVK Evaluation Kit
6. Notice
The OB1203SD-BT2-EVK is provided for reference, demonstration, and/or evaluation. No performance is
guaranteed or warranted, nor is fitness or suitability for any medical device application claimed. Renesas will not
indemnify customers using any part of the provided reference code. OEM is responsible for performance of
products made using any of the provided reference code. For general questions contact Renesas. In addition, for
medical devices Renesas strongly recommends to consult a medical device regulatory compliance advisor.
7. Revision History
Revision
Date
Description
1.00
Nov 19, 2021
Initial release.

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