TSL25721 datasheet(14/41 Pages) OSRAM

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Datasheet, Public

Page 13

[v2-00] 2022-Nov-30

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TSL2572 − Principles Of Operation

System State Machine

An internal state machine provides system control of the ALS

and wait timer 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 the ALS function is enabled. Once enabled,

the device will execute the Wait and ALS states in sequence as

indicated in Figure 16. Upon completion and return to Idle, the

device will automatically begin a new Wait-ALS cycle as long as

PON and AEN remain enabled.

If the 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 16:

Simplified State Diagram

Principles Of Operation

!WEN

& AEN

Sleep

Idle

ALS

Wait

I2C

Start

!PON

INT & SAI

WEN &

AEN

TSL25721 Datasheet(PDF) 14 Page - OSRAM GmbH