TMD27721 datasheet(18/60 Pages) OSRAM

номер детали	TMD27721

подробное описание детали	Digital ALS and Proximity Module

PDF	60 Pages

Scroll/Zoom	100%

производитель	OSRAM [OSRAM GmbH]

домашняя страница	http://www.osram.com

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18 / 60 page

ams Datasheet

Page 17

[v1-21] 2016-Feb-16

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TMD2772/ TMD2772WA − Principles of Operation

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 22. 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 Interrupts for additional

information.

Figure 22:

Simplified State Diagram

Principles of Operation

TMD27721 датащи(PDF) 18 Page - OSRAM GmbH