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This integrates a proximity sensor (PS), an infrared emitting diode (IRED) driver and an
SMBus compatible I2C interface into one chip. The fast I2C interface (up to 750 kHz) is for easy connection
to a micro-controller or embedded controller. A flexible interrupt scheme is provided for
minimal micro-controller utilization. The EAAPMST3923A1 is featuring low power operation, most
suitable for battery powered apparatus.
The proximity sensor (PS) employs a narrow-band, multi-layer optical coating to suppress most infrared
background. Synchronized with the built-in IRED driver, the proximity sensing circuitry adopts
track-and-hold (T&H) and correlated double sampling (CDS) techniques to reject non-synchronized infrared
signals and electrical DC offset. Each proximity measurement takes about 0.8mS, and various sleep-time in
between can be programmed through I2C interface to reduce overall power consumption.
The EAAPMST3923A1 provides a separate pin for level-style interrupt which simplifies and improves
system efficiency by eliminating the need to poll a sensor for PS readings. An interrupt is generated when
the PS reading exceeds the upper threshold. In addition, a programmable interrupt persistence feature
allows the user to determine how many consecutive exceeded readings are necessary to trigger an
interrupt. Interrupt threshold and persistence settings are configurable through I2C interface.
PS-low power consumption, narrow band IR spectrum, programmable IRED intensity, programmable periodic sleep time between each measurement
Interrupts-adjustable interrupt persistency
Green Power-less than 10?A DC supply current during sleep time, less than 0.1?A supply current when powered down
Easy to Use-SMBus Compatible I2C interface, auto register addressing, temperature compensation, interrupt pin and flags
Wide Operating Voltage Range- 1.7V to 3.6V supply for I2C interface, 2.3V to 3.6V sensor power supply, I2C address selection (bonding optional)
Wide Operating temperature Range-40? to 85? ambient temperature
Size-3.94mm (L) ?2.36mm (W) ?1.35mm (H)
The product itself will remain within RoHS compliant version
Compliance with EU REACH
Compliance Halogen Free(Br < 900ppm, Cl < 900ppm, Br+Cl < 1500ppm
Display and keypad dimming adjustment and proximity sensing for: Mobile Devices: smart phone, PDA, GPS Computing Devices: laptop PC, notebook, Consumer Devices: LCD-TV, digital picture frame, digital camera
|Min. Supply Voltage||1.7V|
|Max. Supply Voltage||3.6V|
|Min. Operating Temp.||-40C|
|Max. Operating Temp.||85C|
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