TMG3992 datasheet(21/95 Pages) AMSCO

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[v1-04] 2014-Oct-24

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TMG3992 − Detailed Description

Figure 28:

Detailed State Diagram

As depicted in Figure 27 and Figure 28, the operational cycle of

the device is divided into two parallel functional modes: Pattern

Burst and Gesture/Proximity/Color.

Upon power-up, POR, the device initializes and immediately

enters the low power SLEEP state. In this operational state the

internal oscillator and other circuitry are not active, resulting in

ultra-low power consumption. If I2C transaction occurs during

this state, the oscillator and I2C core wakeup temporarily to

service the communication. Once the Power ON bit, PON, is

enabled, the internal oscillator and attendant circuitry are

active, but power consumption remains low until one of the

functional engine blocks are entered. The first time the SLEEP

state is exited and any of the analog engines are enabled (PEN,

GEN, AEN =1) an EXIT SLEEP pause occurs; followed by an

immediate entry into the selected engine. If multiple engines

are enabled, then the operational flow progresses in the

following order: idle, proximity, gesture (if GMODE = 1), wait,

color/ALS, and sleep (if SAI = 1 and INT pin is asserted). The wait

operational state functions to reduce the power consumption

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