TMD26721 datasheet(14/44 Pages) OSRAM

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ams Datasheet

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[v1-00] 2015-Mar-23

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TMD2672 − Principles of Operation

System State Machine

An internal state machine provides system control of the

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 function is enabled. Once

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

sequence as indicated in Figure 18. Upon completion and

return to Idle, the device will automatically begin a new

prox-wait cycle as long as PON and PEN are enabled.

If the Prox 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 18:

Simplified State Diagram

Principles of Operation

!PEN &

WEN

!WEN

PEN

Sleep

Idle

Wait

Prox

I2C

Start

!PON

INT & SAI

WEN

TMD26721 Scheda tecnica(PDF) 14 Page - OSRAM GmbH