TSL26727 查看數據表（PDF） - austriamicrosystems AG
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TSL26727 Datasheet PDF : 31 Pages
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TSL2672
DIGITAL PROXIMITY DETECTOR
TAOS133 − MAY 2012
System Timing
The system state machine shown in Figure 9 provides an overview of the states and state transitions that
provide system control of the device. This section highlights the programmable features, which affect the state
machine cycle time, and provides details to determine system level timing.
When the proximity detection feature is enabled (PEN), the state machine transitions through the Prox Init, Prox
Accum, Prox Wait, and Prox ADC states. The Prox Init and Prox Wait times are a fixed 2.73 ms, whereas the
Prox Accum time is determined by the number of proximity LED pulses (PPULSE) and the Prox ADC time is
determined by the integration time (PTIME). The formulas to determine the Prox Accum and Prox ADC times
are given in the associated boxes in Figure 12. If an interrupt is generated as a result of the proximity cycle, it
lid will be asserted at the end of the Prox ADC state and transition to the Sleep state if SAI is enabled.
When the power management feature is enabled (WEN), the state machine will transition in turn to the Wait
state. The wait time is determined by WLONG, which extends normal operation by 12× when asserted, and
a WTIME. The formula to determine the wait time is given in the box associated with the Wait state in Figure 13.
ill v Time: 2.73 ms
G st PPULSE: 0 ~ 255 pulses
A t Time: 16.0 μs/pulse
Range: 0 ~ 4.1 ms
ms ten Time: 2.73 ms
Prox
Prox
Init
Sleep
!PON
PEN I2C Start
Prox
Idle
Accum
INT & SAI
Prox
Wait
!WEN
a on PTIME: 1 ~ 256 steps
c Time: 2.73 ms/step
l Range: 2.73 ms ~ 699 ms
Prox
ADC
WEN
Wait
WTIME: 1 ~ 256 steps
WLONG = 0
Time: 2.73 ms/step
Range: 2.73 ms ~ 699 ms
WLONG = 1
Time: 32.8 ms/step
Range: 32.8 ms ~ 8.39s
a Note: PON, PEN, WEN, and SAI are fields in the Enable register (0x00).
TechnicFigure 13. Detailed State Diagram
The LUMENOLOGY r Company
r
r
www.taosinc.com
Copyright E 2012, TAOS Inc.
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