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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.
The Si1141/42/43 updates the I 2 C registers for PS and ALS automatically. Each measurement is allocated a 16-bit
register in the I 2 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
MEAS_RATE register in the I 2 C map.
The Si1141/42/43 can interrupt the host when the PS or ALS measurements reach a pre-set threshold. To assist in
the handling of interrupts the registers are arranged so that the interrupt handler can perform an I 2 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.
18
Rev. 1.3
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