TMD2621 datasheet(8/59 Pages) OSRAM

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Datasheet, Public

Page 7

[v4-00] 2023-Apr-12

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TMD2621 − Detailed Description

Power Up

Upon power-up, device initialization occurs. During

initialization, the device cannot accept I²C transactions and will

deterministically send NAK for any I²C requests. All

communication with the device must be delayed, and all

outputs from the device (i.e. interrupts) must be ignored until

initialization completes. After initialization, the device enters

the SLEEP state in which the internal oscillator and other

circuitry are not active, resulting in ultra-low power

consumption. If an I²C transaction occurs during the SLEEP

state, the I²C core wakes up temporarily to service the

communication. When 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. After PON is set, there is a 100μs wait time required before

enabling PEN. This allows the device time to settle the internal

node voltages and currents before starting the Proximity

measurements. When proximity measurement is enabled

(PEN=1), the device exits the IDLE state. When the function is

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

Figure 9 shows the simplified state diagram of TMD2621. When

a proximity calibration is requested, it will take precedence over

the proximity measurement function. If Sleep After Interrupt is

enabled (SAI = 1 in register 0xAB), the state machine will enter

SLEEP when an interrupt occurs. Entering SLEEP will not change

any of the register settings (e.g. PON will still be high, but the

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

state is terminated when the interrupt status register is cleared

(the status bit is in register 0xA0-0xA1).

Figure 9:

Simplified State Diagram

Detailed Description

SLEEP

IDLE

PON

PROXIMITY

PEN

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