TSL26727 데이터 시트보기 (PDF) - austriamicrosystems AG

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TSL26727

DIGITAL PROXIMITY DETECTOR

austriamicrosystems AG 

TSL2672

DIGITAL PROXIMITY DETECTOR

PRINCIPLES OF OPERATION

TAOS133 − MAY 2012

System States

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 the proximity function is enabled. Once enabled, the

lid device will execute the Prox and Wait states in sequence as indicated in Figure 9. Upon completion and return

to Idle, the device will automatically begin a new prox-wait cycle as long as PON and PEN remain enabled.

If the Prox function generates an interrupt and the Sleep-After-Interrupt (SAI) feature is enabled, the device will

a transition to the Sleep state and remain in a low-power mode until an I2C command is received. See the

v Interrupts section for additional information.

ill Sleep

I2C

Start

!PON

G st INT & SAI

Idle

PEN

ms A tent Prox

Wait

Technicaal con Figure 9. Simplified State Diagram

The LUMENOLOGY r Company

r

r

www.taosinc.com

Copyright E 2012, TAOS Inc.

9

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