The Silicon Labs Si1141/42/43 combines an active optical reflectance proximity detector with an ambient light sensor and an infrared LED into a single 10-Pin QFN package. Their dual port operation enables reliable proximity detection for moving as well as stationary objects.
The Si1141 has 1 LED driver with an Integrated IR LED - RS 8920016.
The Si1142 has 2 LED drivers with and integrated IR LED - RS 8920025.
The Si1143 has 3 LED drivers with and integrated IR LED - RS 8920028.
With the Si1143, locate three infrared LEDs in an L-shaped configuration to enable triangulation of an object and in turn, via host software, creating a gesture based user interface.
These modules have photodiodes which can be used to measure both visible and infrared light. Detect levels as low as 6 lux.
- Adjustable proximity detection from 1 cm to over 50 cm
- Up to 3 independent LED drivers
- 15 current settings from 5.6 mA to 360 mA per driver
- 25.6 μs LED driver pulse width
- High EMI immunity without shielded packaging
- Low power consumption
Feature
- Ultra-sensitive photodiodes with up to 3 independent LED drivers enable multiple functions
- Heart rate and blood oximetry measurements
- Over 50 cm proximity detection
- Advanced 2D and 3D gesture detection
- Cheek detection for handsets
- Ambient light sensor
- Enables accurate light level monitoring under mixed lighting
- Automatic backlight control for improved end user visual experience and reduced backlight energy
- Optional digital UV Index sensor
- Determine real-time UV sun exposure and cumulative UV sun exposure
- Heart rate and blood oximetry measurements
- Over 50 cm proximity detection
- Advanced 2D and 3D gesture detection
- Cheek detection for handsets
- Enables accurate light level monitoring under mixed lighting
- Automatic backlight control for improved end user visual experience and reduced backlight energy
- Determine real-time UV sun exposure and cumulative UV sun exposure
- Low-power sensors, signal processor, and ADC enable long battery life
- As little as 1.2 µA average current with once per second UV Index measurements
- Innovative single-pulse proximity sensor minimizes on-time of IrLED to 25.6 µs – the primary energy consumer
- 9 µA average proximity sensing current (LED pulsed 25.6 µs every 800 ms at 180 mA plus 3 µA Si114x supply)
- Dynamic adjustment of LED currents minimizes power consumption and optimizes performance
- 1.7 to 3.6 V supply voltage
- < 500 nA standby current
- As little as 1.2 µA average current with once per second UV Index measurements
- Innovative single-pulse proximity sensor minimizes on-time of IrLED to 25.6 µs – the primary energy consumer
- 9 µA average proximity sensing current (LED pulsed 25.6 µs every 800 ms at 180 mA plus 3 µA Si114x supply)
- Dynamic adjustment of LED currents minimizes power consumption and optimizes performance
- 1.7 to 3.6 V supply voltage
- < 500 nA standby current
- I²C interface for ease of communication with host MCU
- 0.1 to 128 kLux dynamic range enables operation in direct sunlight
- Minimum reflectance sensitivity of <1 uW/cm2
- Tiny 2x2 mm clear QFN package
- Operating temperature: – 40 to 85 °C
