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TMD2671
DIGITAL PROXIMITY DETECTOR
TAOS144B ? SEPTEMBER 2012
State Diagram
The following state diagram shows a more detailed flow for the state machine. The device starts in the sleep
mode. The PON bit is written to enable the device. A 2.72-ms Start Delay will occur before entering the start
state. If the PEN bit is set, the state machine will step through the proximity accumulate, then proximity ADC
conversion states. As soon as the conversion is complete, the state machine will move to the Wait Check state.
If the WEN bit is set, the state machine will then cycle through the wait state. If the WLONG bit is set, the wait
cycles are extended by 12 × over normal operation. When the wait counter terminates, the state machine will
move to the 2.72-ms Wait Delay state before returning to the Start state.
1 to 255 LED Pulses
Start
Delay
2.72 ms
PON = 1
Sleep
PON = 0
Start
5.44 ms
Pulse Frequency: 62.5 kHz
Time: 16.3 m s ? 4.2 ms
PEN = 1
Prox
Check
PEN = 0
Wait
Delay
WLONG = 0
WEN = 0
1 to 256 steps
Step: 2.72 ms
Prox
Accum
Wait
Check
Time: 2.72 ms ? 696 ms
1 to 256 steps
Step: 2.72 ms
Time: 2.72 ms ? 696 ms
Recommended ? 2.72 ms 1023 Counts
Prox
ADC
WEN = 1
Wait
WLONG = 1
1 to 256 steps
Step: 32.6 ms
Time: 32.6 ms ? 8.35 s
Figure 9. Expanded State Diagram
Copyright E 2012, TAOS Inc.
12
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