TSL26711FN datasheet(19/45 Pages) OSRAM

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[v1-00] 2016-Jul-12

TSL2671 − Principles of Operation

State Diagram

The following state diagram shows a more detailed flow for the

state machine. The device starts in the sleep mode. The PON bit

is written to enable the device. A 2.72-ms Start Delay will occur

before entering the start state. If the PEN bit is set, the state

machine will step through the proximity accumulate, then

proximity ADC conversion states. As soon as the conversion is

complete, the state machine will move to the Wait Check state.

If the WEN bit is set, the state machine will then cycle through

the wait state. If the WLONG bit is set, the wait cycles are

extended by 12X over normal operation. When the wait counter

terminates, the state machine will move to the 2.72-ms Wait

Delay state before returning to the Start state.

Figure 21:

Expanded State Diagram

1 to 256 steps

Step: 2.72 ms

Time: 2.72 ms − 696 ms

Recommended − 2.72 ms 1023 Counts

PEN = 0

Prox

Check

PON = 1

PON = 0

Sleep

Wait

Check

Start

Wait

WEN = 1

Prox

Accum

Prox

ADC

Wait

Delay

PEN = 1

1 to 255 LED Pulses

Pulse Frequency: 62.5 kHz

Time: 16.3

ms − 4.2 ms

WLONG = 0

1 to 256 steps

Step: 2.72 ms

Time: 2.72 ms − 696 ms

WLONG = 1

1 to 256 steps

Step: 32.6 ms

Time: 32.6 ms − 8.35 s

5.44 ms

WEN = 0

Start

Delay

2.72 ms

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