TSL2771 datasheet(22/51 Pages) OSRAM

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ams Datasheet

Page 21

[v1-00] 2016-Mar-22

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TSL2771 − Principles Of Operation

State Diagram

Figure 24 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 delay will occur before entering the start

state. If the PEN bit is set, the state machine will step through

the proximity states of proximity accumulate and then

proximity ADC conversion. As soon as the conversion is

complete, the state machine will move to the following 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 12× over normal operation. When the wait counter

terminates, the state machine will step to the ALS state.

The AEN should always be set, even in proximity-only operation.

In this case, a minimum of 1 integration time step should be

programmed. The ALS state machine will continue until it

reaches the terminal count at which point the data will be

latched in the ALS register and the interrupt set, if enabled.

Figure 24:

Expanded State Diagram

Prox

Check

PON = 1

PON = 0

Sleep

ALS

Check

Wait

Check

Start

Wait

WEN = 1

Prox

Accum

Prox

ADC

ALS

Delay

PEN = 1

AEN = 1

Up to 255 LED Pulses

Pulse Frequency: 62.5 kHz

Time: 16

ms − 4.2 ms

Maximum 4.2ms

Up to 256 steps

Step: 2.72 ms

Time: 2.72 ms − 696 ms

120 Hz Minimum − 8 ms

100 Hz Minimum − 10 ms

Counts up to 256 steps

Step: 2.72 ms

Time: 2.72 mS − 696 ms

Recommended − 2.72 ms 1024 Counts

WLONG = 0

Counts up to 256 steps

Step: 2.72 ms

Time: 2.72 ms − 696 ms

Minimum − 2.72 ms

WLONG = 1

Counts up to 256 steps

Step: 32.64 ms

Time: 32.64 ms − 8.35 s

Minimum − 32.64 ms

Time: 2.72 ms

Prox

Delay

2.72 ms

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