TMG3992 datasheet(30/96 Pages) OSRAM

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[v1-06] 2018-Feb-27

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TMG3992 − Detailed Description

The Color/ALS reception signal path begins with filtered RGBC

detection at the photodiodes and ends with the 16-bit results

in the RGBC data registers. Signal from the photodiode array

accumulates for a period of time set by the value in ATIME before

the results are placed into the RGBCDATA registers. Gain is ad-

justable from 1x to 64x, and is determined by the setting of

CONTROL<AGAIN>. Performance characteristics such as accu-

racy, resolution, conversion speed, and power consumption can

be adjusted to meet the needs of the application.

Before entering (re-entering) the Color/ALS engine, an adjust-

able, low power consumption, delay is entered. The wait time

for this delay is selectable using the WEN, WTIME and WLONG

control bits and ranges from 0 to 8.54s.

An interrupt can be generated whenever Clear Channel results

exceed or fall below levels set in the AILTHL/AILTHH and/or AI-

HTHL/AIHTHH threshold registers. To prevent premature/false

interrupts a persistence filter is also included; interrupts will

only be asserted if the consecutive number of out-of-threshold

results is equal or greater than the value set by APERS. Each

“in-threshold” Clear channel result, CDATA, will reset the persis-

tence count. If the analog circuitry becomes saturated, the ASAT

bit will be asserted to indicate RGBCDATA results may not be

accurate. The AINT and CPSAT bits are always available for I2C

polling, but AIEN bit must be set for AINT to assert a hardware

interrupt on the INT pin. Similarly, saturation of the analog data

converter can be detected by polling CPSAT bit; to enable this

feature the CPSIEN bit must be set. AVALID is cleared by reading

RGBCDATA. ASAT and AINT are cleared by using the Special In-

terrupt Clear I2C transaction to access CICLEAR or AICLEAR.

RGBC results can be used to calculate ambient light levels (I.e.

Lux) and color temperature (I.e. Kelvin).

Gesture Operation

The Gesture detection feature provides motion detection by

utilizing directionally sensitive photodiodes to sense reflected

IR energy by sourced by the integrated LED. The following

registers and control bits govern gesture operation and the

operational flow is depicted in Figure 35.

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