TSL27721 datasheet(16/56 Pages) AMSCO

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[v1-00] 2016-Aug-26

System State Machine

An internal state machine provides system control of the ALS,

proximity detection, and power management features of the

device. At power up, an internal power-on-reset initializes the

device and puts it in a low-power Sleep state.

When a start condition is detected on the I²C bus, the device

transitions to the Idle state where it checks the Enable register

(0x00) PON bit. If PON is disabled, the device will return to the

Sleep state to save power. Otherwise, the device will remain in

the Idle state until a proximity or ALS function is enabled. Once

enabled, the device will execute the Prox, Wait, and ALS states

in sequence as indicated in Figure 21. Upon completion and

return to Idle, the device will automatically begin a new

prox-wait-ALS cycle as long as PON and either PEN or AEN

remain enabled.

If the Prox or ALS function generates an interrupt and the

Sleep-After-Interrupt (SAI) feature is enabled, the device will

transition to the Sleep state and remain in a low-power mode

until an I²C command is received. See the Interrupts section for

additional information.

Figure 21:

Simplified State Diagram

Principles Of Operation

!PEN &

!WEN

& AEN

!WEN

& !AEN

PEN

Sleep

Idle

Wait

ALS

Prox

I2C

Start

!PON

INT & SAI

AEN

WEN

INT & SAI

!AEN

!PEN &

WEN &

AEN

!WEN

& AEN

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