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TMD26723 Datasheet(PDF) 9 Page - ams AG |
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TMD26723 Datasheet(HTML) 9 Page - ams AG |
9 / 29 page TMD2672 DIGITAL PROXIMITY DETECTOR TAOS149C − AUGUST 2012 8 r r Copyright E 2012, TAOS Inc. The LUMENOLOGY r Company www.taosinc.com 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 6. 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 the Interrupts section for additional information. !PEN & WEN !WEN PEN Sleep Idle Wait Prox I2C Start !PON INT & SAI WEN Figure 6. Simplified State Diagram |
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