SI1142-A10-GMR Silicon Laboratories Inc, SI1142-A10-GMR Datasheet - Page 17

• Manufacturer Part Number: SI1142-A10-GMR
• Description: SENS IR PROXIMITY AMB LT 8-ODFN
• Manufacturer: Silicon Laboratories Inc

Specifications of SI1142-A10-GMR

• Mfg Application Notes: Si114x Designer's Guide AppNote Si114x Overlay Considerations AppNote Si114x irLED Guide AppNote Si114x Control Panel Guide AppNote
• Output Type: Digital - I²C
• Sensor Type: Proximity, Infrared and Ambient Light
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 336-1969; SI1142-A10-GM

Si1141/42/43
3.5. Autonomous Operation Mode
The Si1141/42/43 can be placed in the Autonomous Operation Mode where measurements are performed
automatically without requiring an explicit host command for every measurement. The PS_AUTO, ALS_AUTO and
PSALS_AUTO commands are used to place the Si1141/42/43 in the Autonomous Operation Mode.
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The Si1141/42/43 updates the I
C registers for PS and ALS automatically. Each measurement is allocated a 16-bit
2
register in the I
C map. It is possible to operate the Si1141/42/43 without interrupts. When doing so, the host poll
rate must be at least twice the frequency of the conversion rates for the host to always receive a new
measurement. The host can also choose to be notified when these new measurements are available by enabling
interrupts.
The conversion frequencies for the PS and ALS measurements are set up by the host prior to the PS_AUTO,
ALS_AUTO, or PSALS_AUTO commands. The host can set a PS conversion frequency different from the ALS
conversion frequency. However, they both need to be a multiple of the base conversion frequency in the
2
MEAS_RATE register in the I
C map.
The Si1141/42/43 can interrupt the host when the PS or ALS measurements reach a pre-set threshold. To assist in
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the handling of interrupts the registers are arranged so that the interrupt handler can perform an I
C burst read
operation to read the necessary registers, beginning with the interrupt status register, and cycle through the ALS
data registers followed by the individual Proximity readings.
Rev. 1.1
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