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[v1-01] 2019-Nov-20

TSL2672 − Principles O f Operation

System Timing

The system state machine shown in Figure 19 provides an

overview of the states and state transitions that provide system

control of the device. This section highlights the programmable

features, which affect the state machine cycle time, and

provides details to determine system level timing.

When the proximity detection feature is enabled (PEN), the

state machine transitions through the Prox Init, Prox Accum,

Prox Wait, and Prox ADC states. The Prox Init and Prox Wait times

are a fixed 2.73 ms, whereas the Prox Accum time is determined

by the number of proximity LED pulses (PPULSE) and the Prox

ADC time is determined by the integration time (PTIME). The

formulas to determine the Prox Accum and Prox ADC times are

given in the associated boxes in Figure 22. If an interrupt is

generated as a result of the proximity cycle, it will be asserted

at the end of the Prox ADC state and transition to the Sleep state

if SAI is enabled.

When the power management feature is enabled (WEN), the

state machine will transition in turn to the Wait state. The wait

time is determined by WLONG, which extends normal operation

by 12× when asserted, and WTIME. The formula to determine

the wait time is given in the box associated with the Wait state

in Figure 23.

Figure 23:

Detailed State Diagram

Note(s):

1. PON, WEN, AEN, and SAI are fields in the Enable register (0x00).

Prox

Wait

Sleep

Idle

Prox

Init

Prox

Accum

Wait

Prox

ADC

Prox

Time: 2.73 ms

PPULSE: 0 ~ 255 pulses

Time: 16.0

μs/pulse

Range: 0 ~ 4.1 ms

Time: 2.73 ms

PTIME: 1 ~ 256 steps

Time: 2.73 ms/step

Range: 2.73 ms ~ 699 ms

WEN

!PON

Note: PON, PEN, WEN, and SAI are fields in the Enable register (0x00).

!WEN

PEN

INT & SAI

WTIME: 1 ~ 256 steps

WLONG = 0

Time:

2.73 ms/step

Range:

2.73 ms ~ 699 ms

WLONG = 1

Time:

32.8 ms/step

Range:

32.8 ms ~ 8.39s

I2C Start

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