TMG49037 datasheet(21/79 Pages) OSRAM

21 / 79 page

Page 20

ams Datasheet

Document Feedback

[v1-01] 2019-Aug-20

TMG49037 − 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 | GEN | AEN = 1) an EXIT SLEEP pause occurs

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

functions are disabled

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

As depicted in Figure 24 and Figure 25, the gesture/proximity

and CRGB color sensing functions operate in parallel when

enabled (PEN | GEN | AEN = 1). A simplified state diagram for

each function is depicted in Figure 25. 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 gesture, the state machine remains in these active modes to

continue to support these functions. 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

TMG49037 데이터시트(PDF) 21 Page - OSRAM GmbH