TSL25717 データシートの表示（PDF） - TEXAS ADVANCED OPTOELECTRONIC SOLUTIONS

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TSL25717

LIGHT-TO-DIGITAL CONVERTER

TEXAS ADVANCED OPTOELECTRONIC SOLUTIONS 

TSL2571

LIGHT-TO-DIGITAL CONVERTER

TAOS117A − FEBRUARY 2011

State Diagram

Figure 8 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 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. 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.

Sleep

PON = 1

PON = 0

Start

1 to 256 steps

Step: 2.72 ms

Time: 2.72 ms − 696 ms

120 Hz Minimum − 8 ms

100 Hz Minimum − 10 ms

ALS

Wait

Check

ALS

Check

AEN = 1

ALS

Delay

2.72 ms

WEN = 1

WLONG = 0

1 to 256 steps

Step: 2.72 ms

Time: 2.72 ms − 696 ms

Minimum − 2.72 ms

Wait

WLONG = 1

1 to 256 steps

Step: 32.64 ms

Time: 32.64 ms − 8.35 s

Minimum − 32.64 ms

Figure 8. Expanded State Diagram

Copyright E 2011, TAOS Inc.

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