Renesas OB1203SD-RL-EVK User Manual

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Manual

OB1203SD

X0119845 Rev.1.0 Feb 24, 2021

Page 1

-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

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Displays oxygen saturation, pulse, and respiration rate and battery level on an OLED display

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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.

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Operating voltage: 3.0V (AAA battery * 2)

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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%

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Pulse rate: 25bpm to 200 bpm

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Operating temperature: -40 to 85°C

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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.

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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

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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

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Figure 2 shows the pin configuration of the RL78/G13 (32-pin products).

Figure 2. RL78/G13 (32-pin Products) Pin Configuration

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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

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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)

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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

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Operating ambient temperature: TA = -40 to +85°C

DD withstand voltage]: 5 to 25)

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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

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

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Low standby current: 2μA typical

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I2C interface capable of Standard Mode or Fast Mode communication; 1.8V to 3.3V logic compatibl e

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Programmable level-based interrupt func tions with upper and lower thresholds for extending battery life

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Industry’s smallest package: 4.2 × 2 × 1.2 mm3 14-OSIP module

1.3 ISL9111 Boost

The ISL9111 is a low input voltage and high-efficiency synchronous boost converter with a 1A switch. The device provides a power supply solution for single-cell, dual-cell, or three-cell alkaline, NiCd or NiMH batterypowered applications. The ISL9111 has a typical 0.8V start-up voltage and can supply up to 5.25V output voltage. It guarantees to supply 100mA from a sin gl e-cell input and 240mA from a dual-cell input when the output is 3.3V. High 1.2MHz switching frequency al lows 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 ISL9111.

Figure 4. Typical Application Circuit

1.3.1. ISL9111 K ey Features

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Up to 97% Efficiency at Typical Operating Conditions

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Minimum Start-up Voltage

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0.8V (ISL9111)

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0.6V (ISL9111A)

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Minimum Operating Voltage

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0.7V (ISL9111)

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0.5V (ISL9111A)

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Low Quiescent Current: 20μA (Typical)

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At VOUT = 3.3V

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100mA Output Current at VIN = 0.9V

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240mA Output Current at VIN = 1.8V

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Logic Control Shutdown (Iq < 1µA)

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Output Voltage up to 5.25V

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Output Disconnect during Shutdown

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Skip Mode under Light Load Condition

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Undervoltage Lockout (ISL9111 Only)

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Fault Protection: OVP (ADJ Version Only), OTP, Short Circuit

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6 Ld SOT-23 Package

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1.4 Setup and Configuration

The evaluation kit runs on battery power. After switching the battery switch ON, press the power key S1 to start the SpO

and HR measurements.

Without target (for example, a finger) or without av ai l able SpO

or HR data, the OLED displays lines as shown in

Figure 5.

Figure 5. No Measurement

Place your finger on the sensor as shown in Figure 3.3. Keep the pressure on the sensor low to avoid blood flow restriction. With the finger on the sensor, t he IR LED and red LED light up and the measurement starts. After a few seconds, the SpO

and heart rate are displayed (see Figure 6).

Figure 6. Measurement

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2. Board Design

The OB1203 sensor interrupt triggers the MCU to read the sensor data. The MCU determines blood oxygen saturation, he art and respiration rate, and sends the data v i a I2C to the

OLED display. The OLED displays the data along with the battery status. The ISL9111 adjusts the voltage of two AAA batteries to the systems supply needs of 3.3V. The S1 button powers on the system. The following figures show the board’s pictures.

Figure 7. OB1203SD-RL-EVK (Bottom)

Figure 8. OB1203SD-RL-EVK (Top)

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Component

Type

Remark

Photoplethysmography

OB1203

Renesas part: Heart Rate, Blood Oxygen Concentration, Pulse Oximetry, OLED

SSD1306

Available from local suppliers

Battery

AAA battery

Available from local suppliers

Boost IC (3.3V)

ISL9111

Renesas part

MCU

RL78/G13

Renesas part (R5F100BGA)

2.1 System Outline

The OB1203 (bio-sensor module) integrates a red and IR LED, LED drivers, photodetectors, ADC and I2C module. In PPG mode, it measures the amount of ref l ect ed l i ght of the red and infrared LEDs from a target object like a finger. The photodiodes output signal s are converted to digital values by the integrated ADC and stored in a FIFO buffer readable via I2C bus.

The MCU calculates oxygen saturation, pulse and respiration rate with the provided algorithm. Oxygen saturation, pulse and respiration rate are displayed on an OLED panel.

The ISL9111 is a low input voltage and high efficiency synchronous boost converter with 1A switch. The following figure shows the system block diagram.

Figure 9. System Block Diagram

2.1.1. Main Component s

The following table lists the main components of the evaluation kit.

Table 1. Main Components of the Evaluation Kit

sensor module

Proximity, Light and Color Sensor

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No.

Pin Name

Connection

Function Description

Function Module

P31

INTB

Interrupt from HR, SpO2 and RR

I2C communication with HR, SpO2 and

P61

SDAA0

IIC data for OB1203

P60

SCLA0

IIC clock for OB1203

P30

SCL11

IIC clock for OLED module

OLED (SSD1306) control

P50

SDA11

IIC data for OLED module

P22

ANI2

A/D input

Battery level detection

P51

IRQ2

Interrupt input

System power up

P70

POWER_ON

I/O for power enable

2.1.2. MCU Pins Used

The following table lists the used pins and their functions.

Table 2. Pins used

sensor (OB1203)

2.2 Power Supply

The system’s power supply includes the following parts:

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3.3V boost Circuit

■

Power ON Control

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2 AAA batteries

RR sensor (OB1203)

2.2.1. 3.3V Boost Circuit

The following figure shows the schematic of t he boost circuit.

Figure 10. Boost Circuit

The power supply (2 AAA battery) acts as the input (VIN) for the ISL9111 to generate 3.3V system power. The ISL9111 provides a power supply solution for singl e-cell, dual- or three-cell alkaline, NiCd or NiMH batterypowered applications, capable of sourcing up t o 1A output current. This boost converter operat es f rom i nput voltage of 0.7V to 6.5V. The output voltage of the ISL9111 can be programmed from 2.5V to 5.25V.

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2.2.2. Power ON Control

The following figure shows the schematic of power ON control circuit.

Figure 11. Power ON Control Circuit

When pressing the S1 button, the system is conne ct ed to BAT+ through D6, Q5, and the MOSFET Q3. After the MCU’s Power-on Reset, the MCU checks on the battery voltage:

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Battery voltage is nominal – The MCU sets the Power_On line high keeping the system powered when S1 i s released.

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Battery voltage is low – Power_On is not set high. The MCU is powered off when S1 is released.

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SCL1

BS2

BS0

BS1

IR EF

CS#

D/C#

RES#

C2P

C2N

C1P

C1N

VCOMH

VCC

VLSS

VSS

VBAT

VDD

R/W#

E/RD#

NC_3

NC_2

NC_1

SSD1306

910K

1uF

4.7uFC52.2uF

1uFC11uF

4K7

R10

1N4148

10uF

3.3V

3.3V 3.3V

3.3V

SDA1

4K7

R11

4K7

R12

10KR610K

GND

2.3 OLED Circuit

The following figure shows the schematic of OLED circuit.

OLED display uses SSD1306 as the main control IC. T he RL78/G13 communicates with the SSD1306 through I2C in order to control the OLED display.

2.4 OB1203 Circuit

The following figure shows the schematic for the OB1203 circuit.

Figure 12. OLED Circuit

Figure 13. OB1203 Circuit

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Item

Description

Microcontroller used

RL78/G13 (R5F100BG,128KB ROM,12KB RAM)

Operating frequency

High-speed on-chip oscillator (HOCO) clock: 32MHz

Operating voltage

3.3V Integrated development

e2 studio V7.6.0 from Renesas Electronics Corp

main()

Call OB1203 main process

ob1203_spo2_main()

While(1)

Peripheral initialization

R_MAIN_UserInit()

R_MAIN_UserInit

Enable interrupt

EI()

Start INTC4 operation

for OB1203 interrupt input

RET

3. Software

3.1 Integrated Development Environment

The provided code has been developed to run under the conditions listed in the table below.

Table 5.1 Operation Conditions

CPU/peripheral hardware clock: 32MHz

(RL78/G13 at 24MHz: 1.6V - 5.5V; OB1203: 1.7V - 3.6V, IR LED and red LED: 3.3V - 4.5V)

environment (e2 studio)

3.2 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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Set the defau lt configuration

to OB1203 via I2C0

defaultConfig()

Set OB1203 INT vector to

proximity Event

Start timer for 10ms counter

t_start()

Get the sum of squares

spo2.get_sum_squares()

ob1203_spo2_main()

Proximity mode?

Generated

proximity INT?

Counter > 0.5s?

FIFO full INT:

afull_int_en = 1?

Bio-sensor mode

Make algorithm part1

spo2.do_algorithm_part1()

samples_processed = 0

(clear flag)

do_part2 = 1 (set flag)

Counter < 1s?

Bio-sensor mode?

samples_ready = 1?

Get sensor data, and adjust

LED current gain for the fit

sensor count v alue

get_sensor_data()

samples_processed = 1 (set flag)

do_pa rt2 && afull_int_en &&samples_pro cessed ?

Make algorithm part2

spo2.do_algorithm_part2()

Update resul t display

OLED_display_update()

Clear do_part2,

samples_processed flag

When OB1203 LED1 & LED2 current adjust is completed, and specified amount of IR data and red data are in range, afull_int_en bit is set to 1.

Reset timer

t_reset()

OLED display sensor off status

OLED_Sensor_Off()

Increment idle_counter

idle_counter > 60s?

Clear idle_counter, and call

power off subroutine

Power_Off_Ctrl()

While(1)

Initialize parameters for

OB1203 and spo2

ob1203.OB1203_init()

spo2.SPO2_init()

OLED display sensor off status

OLED_Sensor_Off()

Battery and u nit display

Battery_Display_InApp()

Set “Power On" pin to High

Power_On_Ctrl()

Initialize and clear OLED

OLED_Init()

OLED_Clear()

Delay 2s for key long press

Reset timer

t_reset()

Get proximity data, and judge

to switch to bio-sensor mode

Get_prox_data()

3.3 OB1203 Module Routines

The following figure shows the flowchart of oximeter measure routine.

Figure 16. PPG Measurement Routine

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Part Number

Description

OB1203SD-RL-EVK

OB1203SD-RL-EVK Evaluation Kit

Revision

Date

Description

1.0

Feb 24, 2021

Initial release.

4. Related Information

■

RL78/G13 Microcontroller User's Manual: Hard ware

■

OB1203 Datasheet

■

ISL9111 Datasheet

5. Ordering Information

6. Revision History

IMPORTANT NOTICE AND DISCLAIMER

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These resources are intended for developers skilled in the art designing with Renesas products. You are solely responsible for (1) selecting the appropriate products for your application, (2) designing, validating, and testing your application, and (3) ensuring your application meets applicable standards, and any other safety, security, or other requirements. These resources are subject to change without notice. Renesas grants you permission to use these resources only for development of an application that uses Renesas products. Other reproduction or use of these resources is strictly prohibited. No lic ense is granted to any other Renesas intellectual property or to any third party intellectual property. Renesas disclaims responsibility for, and you will fully indemnify Renesas and its representatives against, any claims, damages, costs, losses, or liabilities arising out of your use of these resources. Renesas' products are provided only subject to Renesas' Terms and Conditions of Sale or other applicable terms agreed to in writing. No use of any Renesas resources expands or otherwise alters any applicable warranties or warranty disclaimers for these products.

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www.renesas .com

Trademarks

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(Rev.1.0 Mar 2020)

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Renesas OB1203SD-RL-EVK User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

1. Functional Description

1.1 RL78/G13 Microcontroller

1.1.1. RL78/G13 Ke y Features

1.2 OB1203 Photoplethysmography Sensor

1.2.1. OB1203 Key Features

1.2.1.1. Biosensor Features

1.2.1.2. Biosensor Applications

1.2.1.3. Physical Characteristics

1.3 ISL9111 Boost

1.3.1. ISL9111 K ey Features

1.4 Setup and Configuration

2. Board Design

2.1 System Outline

2.1.1. Main Component s

2.1.2. MCU Pins Used

2.2 Power Supply

2.2.1. 3.3V Boost Circuit

2.2.2. Power ON Control

2.3 OLED Circuit

2.4 OB1203 Circuit

3. Software

3.1 Integrated Development Environment

3.2 Main Process

3.3 OB1203 Module Routines

4. Related Information

5. Ordering Information

6. Revision History