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Heart Rate, Blood Oxygen
Concentration, Pulse Oximetry,
Proximity, Light and Color Sensor
OB1203
Datasheet
Description
The OB1203 Sensor Module integrates a multi-channel light sensor
(LS/CS), a proximity sensor (PS), and a photoplethysmography
sensor (PPG).
The light sensor can be configured as ambient light sensor (LS) to
measure ambient light similar to the human eye experience or as
an RGB color sensor (CS). The module has a fully integrated
biosensor for reflective photoplethysmography. With the approp-
riate algorithm, it can determine human heart rate (HR), oxygen
saturation (SpO2), respiration rate, and heart rate variability (a
measure of stress). The OB1203 integrates light sources and
drivers in a single optically optimized package.
A major LS application of the device is in smart phones or other
mobile devices to enable brightness control of display panels. The
OB1203 can also determine proximity of nearby objects in order to
support the activation of touch screen displays or system functions.
The sensor combines optical sensing features (CS, LS, PS) and
bio-sensing functionality (PPG) without needing a visible optical
opening. The unique implementation of the OB1203 enables SpO2
measurements behind ink that is IR transmissive, but visibly dark,
allowing implementation in aesthetic industrial designs.
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
Ambient Light Sensor Features
High lux accuracy over different light sources
Absolute sensitivity: 0.06 lux to > 150000 lux
Output resolution LS/CS: 13 to 20 bits
Three LS/CS gain modes: x1 to x6
Highly linear output, 50Hz/60Hz light and fluorescent light
flicker immunity
Color Sensor Features
Four parallel channels (red, green, blue, clear)
Accurate Correlated Color Temperature (CCT)
Accurate CIE 1931 XYZ (RGB) color measurement
Very stable spectral response over angle of light incidence
Output resolution CS: 13 to 20 bits
Proximity Sensor Features
Integrated and trimmed LED source, driver, and photodetector
Programmable pulsed LED up to 250mA output current
High resolution (12 to 16 bits)
Object movement detection (in/out)
Ambient light suppression > 100klx sun light
Crosstalk cancelation (analog and digital)
Physical Characteristics
Highly reliable and industry-proven OSIP package with
integrated cover glass for hypoallergenic products
Wide operation temperature: - 40°C to +85°C
Wide supply voltage: 1.7V to 3.6V
Typical active current at minimum duty cycle:
LS/CS:110µA
PS: 90µA + LED current (typical ~300µA average)
Low standby current: 2µA typical
I2C interface capable of Standard Mode (100kHz) or Fast
Mode (400kHz) 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
Figure 1. 3D Package Rendering
© 2020 Renesas Electronics Corporation
1
May 29, 2020

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OB1203 Datasheet
Biosensor, LS and PS Applications
Mobile devices such as smartphones, smart accessories,
touch screen disable, display brightness and color adjust,
smartwatches, secondary sensor for blood pressure
Head phones
Hearables
Fitness and wellness
Occupancy
Gesture detection
Industrial applications such as proximity and light detection in
less than 1ms, fast light barriers, lighting control, robotics,
agriculture and hydroponic light sensing, daylighting
Application Circuit
Figure 2. Typical Circuit – Only 6 Connections
VDD2
VDD1
LED_VDD
VDD
SCL
SDA
INT
Microcontroller
VSS
Rup
VDD OB1203 IC
SCL LED1
SDA LED2
INT
CVDD
AGND
GND
LGND
LVDD
LED1
LED2
OB1203
Module
CLED
Figure 3. Block Diagram
VDD
OB1203
Module
Metal
covered
Ambient Light
Cancellation
ADC
ADC
ADC
ADC
ADC
Light
Sensor
ADC
2nd Order
(hybrid) SD
Crosstalk/Offset
Cancellation
Reference
Generation
Main State Machine
LS
FSM Register
File
Fuses
Interrupt
Finite State
Machine (FSM)
I2C
Decimation
Filter
PS/HR/
SPO2
FSM
FIFO
Register
Sample
Averaging
Digital Block
INT
SDA
SCL
LVDD
LED1
LED2
RED
IR
LED
Driver
LGND
Proximity and
Biosensor
POR
Low Power
Regulator
HP OSC
Analog
Support
(Bandgap)
AGND
LP OSC
Analog
Power
Supply
OB1203 IC
Analog
Digital
© 2020 Renesas Electronics Corporation
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OB1203 Datasheet
Contents
1. Pin Assignments...........................................................................................................................................................................................7
2. Pin Descriptions............................................................................................................................................................................................7
3. Absolute Maximum Ratings..........................................................................................................................................................................8
4. Recommended Operating Conditions ..........................................................................................................................................................8
5. Electrical and Optical Characteristics ...........................................................................................................................................................9
6. Typical Performance Characteristics..........................................................................................................................................................12
7. Detailed Description ...................................................................................................................................................................................15
7.1 Application Circuit..............................................................................................................................................................................16
7.2 Modes of Operation ...........................................................................................................................................................................16
7.3 Main State Machine...........................................................................................................................................................................16
7.4 Light Sensor Description ...................................................................................................................................................................18
7.5 Proximity and PPG Sensor Description.............................................................................................................................................19
7.5.1 LEDs and Integrated LED Driver ........................................................................................................................................19
7.5.2 Principles of Proximity Sensor Operation ...........................................................................................................................19
7.5.3 Principles of PPG Sensor Operation ..................................................................................................................................20
7.6 Interrupt Features ..............................................................................................................................................................................22
7.6.1 LS Interrupt.........................................................................................................................................................................22
7.6.2 PS Interrupt ........................................................................................................................................................................22
7.6.3 PPG Interrupt......................................................................................................................................................................24
7.7 I2C Interface......................................................................................................................................................................................24
7.7.1 I2C Address Decoding........................................................................................................................................................24
7.7.2 I2C Register Read ..............................................................................................................................................................24
7.7.3 I2C Register Write ..............................................................................................................................................................25
7.7.4 I2C Interface Bus Timing ....................................................................................................................................................26
7.8 Summary of Internal Registers ..........................................................................................................................................................26
7.9 Detailed Description of Registers ......................................................................................................................................................29
7.9.1 STATUS_0 .........................................................................................................................................................................29
7.9.2 STATUS_1 .........................................................................................................................................................................30
7.9.3 PS_DATA ...........................................................................................................................................................................31
7.9.4 LS_CLEAR_DATA..............................................................................................................................................................32
7.9.5 LS_GREEN_DATA.............................................................................................................................................................33
7.9.6 LS_BLUE_DATA ................................................................................................................................................................34
7.9.7 LS_RED_DATA..................................................................................................................................................................35
7.9.8 COMP_DATA .....................................................................................................................................................................36
7.9.9 MAIN_CTRL_0 ...................................................................................................................................................................37
7.9.10 MAIN_CTRL_1 ...................................................................................................................................................................38
7.9.11 PS_LED_CURR .................................................................................................................................................................39
7.9.12 PS_CAN_PULSES .............................................................................................................................................................40
© 2020 Renesas Electronics Corporation
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May 29, 2020