High precision optical sensor family senses UV
Index, ambient light, long range proximity, heart rate/
pulse oximetry and motion with 2D or 3D gestures.
Si1132 Ultraviolet (UV) Index and Ambient Light Sensor
The monolithic Si1132 sensor integrates multiple photodiodes, an analog-to-digital
converter, a signal processor and a digital I
2
C control interface. This UV Index and ambient
light sensor enables fitness wrist/arm bands, smart watches, and smartphones to measure
UV sun exposure. Customers benefit by receiving a warning of when their current UV
exposure is at an unhealthy level or to determine their cumulative UV exposure during
exercise.
Si114x Multi-LED Heart Rate, SpO2, Proximity and Ambient Light
The monolithic Si114x sensors integrate high sensitivity photodiodes, a low-noise
analog-to-digital converter, analog filtering, up to 3-LED drivers and a digital I
2
C
control interface into one package. Broad spectral sensitivity supports green through
940nm LEDs for wrist, ear, and finger-tip heart rate/SpO2 signals. This low-power
sensing family enables long battery life with standby less than 500 nA and a short
25.6µs LED on time.
Register
Map
Temp
Sensor
Signal Processing & Control Logic
SMBus
Oscillator
SDA
SCL
INT
VDD
GND
Visible
Infrared
ADC Filter
IDEAL FOR WEARABLE
APPLICATIONS
Digital UV Index sensor enables real-time
UV sun exposure and cumulative UV sun
exposure
Ambient light sensor with 0.1 to 128 kLux
dynamic range operates in direct sunlight
Long battery life with as little as 1.2 µA
average current UV Index measurements,
< 500 nA standby, and 1.7 V to 3.6 V
operation
I
2
C interface for ease of communication
with host MCU
Tiny 2 mm x 2 mm clear QFN package
Operating temperature – 40 to 85 °C
BIOMETRIC, PROXIMITY,
AND AMBIENT LIGHT
SENSING
Accurately sense weak blood ow signals
Advanced signal processing to extract
heart rate information
Broad spectral sensitivity supports green
through 940nm LEDs
Dynamically drive 1, 2, or 3 LEDs
Long battery life
I
2
C interface for ease of communication
with host MCU
Tiny 2 mm x 2 mm clear QFN package
Register
Map
Temp
Sensor
LED
Drivers
Signal Processing & Control Logic
SMBus
Oscillator
SDA
SCL
INT
VDD
GND
LED3
LED2
LED1
Visible
Infrared
ADC Filter
Infrared
Emitter
Ambient Light
Sources
Transparent Window
Product Case