Renesas OB1203SD-RL-EVK User Manual
Manual
OB1203SD
E
X0119845 Rev.1.0
Feb 24, 2021
Page 1
© 2021 Renesas Electronics
-RL-EVK
valuation kit for Heart Rate, SpO2, and Respirati on Rate
This OB1203SD-RL-EVK evaluation kit for Heart
Rate, SpO2, and Respiration Rate uses Renesas’
highly integrated biosensor OB1203 for reflect ive
photoplethysmography.
With the provided algorithm, the kit can determine
Heart Rate, Oxygen Saturation (SpO2), and
Respiration Rate. The sensor transmits its data via
an I2C interface to an MCU for data analysis and
result display.
The design incorporates an RL78/G13-16 bit
microcontroller as MCU, an ISL9111 voltage boost
converter for battery operation, and an OLED
display.
Functions
■
Collects data from Renesas OB1203 sensor
module through I2C communication
■
Calculates the oxygen saturation, pulse, and
respiration rate using the provided algorithm
■
Displays oxygen saturation, pulse, and respiration
rate and battery level on an OLED display
■
Boosts battery voltage to system’s voltage needs
Evalution Kit
Specifications
The OB1203SD-RL-EVK monitors heart rate, blood
oxygen saturation, and respiration rate. Batteryoperated and portable the evaluation kit is suitabl e
for monitoring at home, during exercise, or travel.
■
Operating voltage: 3.0V (AAA battery * 2)
■
Detector module: OB1203 sensor module
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Display module: OLED (Built-in control chip)
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Measurement range: Oxygen saturation:
70% to 100%
■
Pulse rate: 25bpm to 200 bpm
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Operating temperature: -40 to 85°C
■
Operating humidity: 5 to 99% RH (No condensate
water)
Target Devices
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MCU: RL78/G13 (R5F100BGA)
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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 need to be fully evaluated as well.
OB1203SD-RL-EVK Evaluation Kit Manual
X0119845 Rev.1.0
Feb 24, 2021
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Contents
1. Functional Description .................................................................................................................................. 3
1.1 RL78/G13 Microcontroller ...................................................................................................................... 3
1.1.1. RL78/G13 Key Features ......................................................................................................... 5
1.2 OB1203 Photoplethysmography Sensor ............................................................................................... 6
1.2.1. OB1203 Key Features ............................................................................................................. 6
1.3 ISL9111 Boost ....................................................................................................................................... 7
1.3.1. ISL9111 Key Features ............................................................................................................ 7
1.4 Setup and Configuration ........................................................................................................................ 8
2. Board Design.................................................................................................................................................. 9
2.1 System Outline .................................................................................................................................... 10
2.1.1. Main Components ................................................................................................................. 10
2.1.2. MCU Pins Used ..................................................................................................................... 11
2.2 Power Supply ....................................................................................................................................... 11
2.2.1. 3.3V Boost Circuit ................................................................................................................. 11
2.2.2. Power ON Control ................................................................................................................. 12
2.3 OLED Circuit ........................................................................................................................................ 13
2.4 OB1203 Circuit .................................................................................................................................... 13
3. Software ........................................................................................................................................................ 14
3.1 Integrated Development Environment ................................................................................................. 14
3.2 Main Process ....................................................................................................................................... 14
3.3 OB1203 Module Routines ................................................................................................................... 15
4. Related Information ..................................................................................................................................... 16
5. Ordering Information ................................................................................................................................... 16
6. Revision History .......................................................................................................................................... 16
Figures
Figure 1. RL78/G13 Block Diagram .......................................................................................................................... 3
Figure 2. RL78/G13 (32-pin Products) Pin Config urat ion ......................................................................................... 4
Figure 3. Typical Application Circuit ......................................................................................................................... 6
Figure 4. Typical Application Circuit ......................................................................................................................... 7
Figure 5. No Measurement ....................................................................................................................................... 8
Figure 6. Measurement ............................................................................................................................................. 8
Figure 7. OB1203SD-RL-EVK (Bottom) ................................................................................................................... 9
Figure 8. OB1203SD-RL-EVK (Top) ........................................................................................................................ 9
Figure 9. System Block Diagram ............................................................................................................................ 10
Figure 10. Boost Circuit .......................................................................................................................................... 11
Figure 11. Power ON Control Circuit ...................................................................................................................... 12
Figure 12. OLED Circuit .......................................................................................................................................... 13
Figure 13. OB1203 Circuit ...................................................................................................................................... 13
Figure 14. Main Processing Routine ...................................................................................................................... 14
Figure 15. User Initialization Routine ...................................................................................................................... 14
Figure 16. PPG Measurement Routine .................................................................................................................. 15
OB1203SD-RL-EVK Evaluation Kit Manual
X0119845 Rev.1.0
Feb 24, 2021
Page 3
1. Functional Description
1.1 RL78/G13 Microcontroller
The RL78/G13 is 32MHz, 16-bit CPU. Figure 1 shows the block diagram of the RL78/G13.
Figure 1. RL78/G13 Block Diagram
OB1203SD-RL-EVK Evaluation Kit Manual
X0119845 Rev.1.0
Feb 24, 2021
Page 4
Figure 2 shows the pin configuration of the RL78/G13 (32-pin products).
Figure 2. RL78/G13 (32-pin Products) Pin Configuration
OB1203SD-RL-EVK Evaluation Kit Manual
X0119845 Rev.1.0
Feb 24, 2021
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1.1.1. RL78/G13 Ke y Features
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Minimum instruction execution time: Can be changed from high speed (0.03125μs: at 32MHz operation with
high-speed on-chip oscillator) to ultra-low speed (30.5μs at 32.768kHz operation with subsystem clock)
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General-purpose registers: (8-bit register × 8) × 4 banks
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ROM: 16KB to 512KB, RAM: 2KB to 32KB, Data Flash: 4KB to 8KB
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Selectable high-speed on-chip oscillator clock: 32/24/16/12/8/6/4/3/2/1 MHz (Typical)
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On-chip single power supply flash memory
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Power management and reset function
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On-chip power-on-reset (POR) circuit
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On-chip voltage detector (LVD) (Select interrupt and reset from 14 levels)
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On-chip debug function
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On-chip key interrupt function
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On-chip clock output/buzzer output controller
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I/O port: 16 to 120 (N-ch open drain I/O [withstand voltage of 6 V]: 0 to 4, N-ch open drain I/O [VDD withstand
voltage EV
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Timers
●
16-bit timer: 8 to 16 channels
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12-bit interval timer: 1 channel
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Real-time clock: 1 channel (calendar for 99 years, al arm function, and clock correction function)
●
Watchdog timer: 1 channel (operable with the dedicated low-speed on-chip oscillator)
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Serial interface
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CSI: 2 to 8 channels
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UART/UART (LIN-bus supported): 2 to 4 channels
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I2C/Simplified I2C communication: 2 to 8 cha nnels
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8/10-bit resolution A/D converter: 6 to 26 channels
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Internal reference voltage (1.45 V) and temperature sensor
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DMA (Direct Memory Access) controller: 2/4 channels
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Multiplier and divider/multiply-accumulator
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16 bits × 16 bits = 32 bits (Unsigned or signed)
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32 bits ÷ 32 bits = 32 bits (Unsigned)
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16 bits × 16 bits + 32 bits = 32 bits (Unsigned or signed)
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Standby function: HALT mode, STOP mode, S NOOZ E mode
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Power supply voltage: VDD = 1.6 to 5.5V
■
Operating ambient temperature: TA = -40 to +85°C
DD withstand voltage]: 5 to 25)
OB1203SD-RL-EVK Evaluation Kit Manual
X0119845 Rev.1.0
Feb 24, 2021
Page 6
1.2 OB1203 Photoplethysmography Sensor
The OB1203 Sensor Module has a fully integrated sensor for reflective photoplethysmography (P PG), 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 (SpO
determined.
The following figure shows the typical application circuit of OB1203.
Figure 3. Typical Application Circuit
), and respiration rate are
2
1.2.1. OB1203 Key Features
1.2.1.1. Biosensor Features
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SpO2 measurement behind visibly dark, IR transmissive ink
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Industry’s smallest optical biosensor module
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Fully integrated and trimmed module, including two L E Ds, 250mA maximum drive current, and photodetectors
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Output resolution PPG: 16 to 18 bits
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Data stored in 18-bit wide, 32-sample FIFO memory
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Integrated averaging function for higher signal-to-noise ratio (SNR) and data rate reduction
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Programmable measurement rate: up to 3200 samples per second
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High SNR
1.2.1.2. Biosensor Applications
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Sensor for Heart rate, blood oxygen saturation, and res pirat ion rate
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Secondary sensor for blood pressure
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Fitness and wellness, wearable devices
1.2.1.3. Physical Characteristics
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Highly reliable and industry-proven OSIP package with integrated cover glass for hypoallergenic product s
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Wide operation temperature: - 40 to +85°C
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Wide supply voltage: 1.7V to 3.6V
■
Low standby current: 2μA typical
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