Silicon Labs Si1142/43 Proximity/Ambient Light Sensor ICs
Silicon Labs Si1142/43 Proximity/Ambient Light Sensor ICs are a low-power, reflectance-based, infrared proximity and ambient light sensor with I2C digital interface and programmable-event interrupt output. This touchless sensor IC includes an analog-to-digital converter, integrated high-sensitivity visible and infrared photodiodes, a digital signal processor, and one, two, or three integrated infrared LED drivers with 15 selectable drive levels. These sensors offer excellent performance under a wide dynamic range and a variety of light sources, including direct sunlight. Each device can also work under dark glass covers. The photodiode response and associated digital conversion circuitry provide excellent immunity to artificial light flicker noise and natural light flutter noise. With two or more LEDs, the Silicon Labs Si1142/43 sensor ICs are capable of supporting multiple-axis proximity motion detection.
Features
- Integrated infrared proximity detector
- Proximity detection adjustable from under 1cm up to 200cm
- Three independent LED drivers
- 15 current settings from 5.6mA to 360mA for each LED driver
- 25.6μs LED driver pulse width
- 50cm proximity range with single pulse (<3klx)
- 15cm proximity range with single pulse (>3klx)
- Operates at up to 128klx (direct sunlight)
- High reflectance sensitivity <1μW/cm2
- High EMI immunity without shielded packaging
- Integrated ambient light sensor
- 100mlx resolution possible, allowing operation under dark glass
- 1klx to 128klx dynamic range possible across two ADC range settings
- Accurate lux measurements with IR correction algorithm
- 1.71V to 3.6V supply voltage
- 9μA average current (LED pulsed 25.6μs every 800ms at 180mA plus 3μA Si114x supply)
- <500nA standby current
- 25.6μs LED "on" time keeps total power consumption duty cycle low without compromising performance or noise immunity
- Internal and external wake support
- Built-in voltage supply monitor and power-on reset controller
- Serial communications
- Up to 3.4Mbps data rate
- Slave mode hardware address decoding (0x5A)
- Small-outline 10-lead 2mm x 2mm QFN
- -40 to +85°C operating temperature range
Applications
- Handsets
- Heart rate monitoring
- Pulse oximetry
- Wearables
- Audio products
- Security panels
- Tamper detection circuits
- Dispensers
- Valve controls
- Smoke detectors
- Touchless switches
- Touchless sliders
- Occupancy sensors
- Consumer electronics
- Industrial automation
- Display backlighting control
- Photo-interrupters
Block Diagram
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Publicado: 2019-10-07
| Actualizado: 2025-09-11