TMD27253M datasheet(13/50 Pages) AMSCO

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ams Datasheet

Page 13

[v1-11] 2016-Sep-20

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TMD2725 − 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 lowpower Sleep state. When a write on

I²C bus to the Enable register (0x80) PON bit is set, the device

transitions to the Idle state. 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 ALS,

Proximity and Wait states in sequence as indicated in Figure 18

and Figure 19. Upon completion, the device will automatically

begin a new ALS-Prox-Wait 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 clearing

the interrupts in the STATUS register. See Interrupts for

additional information.

Principles of Operation

TMD27253M Datasheet(PDF) 13 Page - ams AG