TMD4903 datasheet(20/86 Pages) OSRAM

20 / 86 page

Datasheet, Public

Page 19

[v2-00] 2022-Nov-03

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TMD4903 − Detailed Description

Upon power-up, POR, the device initializes. During initialization

(typically 200μs), the device will deterministically send NAK on

I²C and cannot accept I²C transactions. All communication with

the device must be delayed, and all outputs from the device

must be ignored including interrupts. After initialization, the

device enters the 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 I²C core wake up temporarily to service the

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

device enters the IDLE state in which the internal oscillator and

attendant circuitry are active, but power consumption remains

low. The first time the SLEEP state is exited and any functions

are enabled (PEN | AEN | IBEN = 1) an EXIT SLEEP pause occurs

followed by an immediate entry into the selected engines. If all

functions are disabled

(PEN = 0 & AEN = 0 & IBEN = 0), the device returns to the IDLE

state.

As depicted in Figure 23 and Figure 24, the proximity and CRGB

color sensing functions operate in parallel when enabled (PEN

| AEN = 1). The IRBeam pattern generator takes priority when

enabled (IBEN = 1).Proximity will not function, and ALS

integration only occurs while IRBeam is in standby. In addition,

when proximity or calibration is requested, it will temporarily

disable the proximity function. A simplified state diagram for

each function is depicted in Figure 24. Each function is

individually configured (e.g. Gain, ADC integration time, wait

time, persistence, thresholds, etc.).

Sleep After Interrupt Operation

If Sleep After Interrupt is enabled (SAI = 1), the state machine

will enter SLEEP when non-gesture interrupts occur. However

for IRBeam, the state machine remains active to continue to

support this function. Entering SLEEP does not automatically

change any of the register settings (e.g. PON bit is still high, but

the normal operational state is over-ridden by SLEEP state).

SLEEP state is terminated when the SAI bit is cleared.

Detailed Description

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