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WM9712CLGEFL/V Datasheet(PDF) 50 Page - Wolfson Microelectronics plc

Part # WM9712CLGEFL/V
Description  AC??7 Audio and Touchpanel CODEC
PDF  78 Pages
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Manufacturer  WOLFSON [Wolfson Microelectronics plc]
Direct Link  http://www.wolfsonmicro.com
Logo WOLFSON - Wolfson Microelectronics plc

WM9712CLGEFL/V Datasheet(HTML) 50 Page - Wolfson Microelectronics plc

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WM9712L
Production Data
w
PD, Rev 4.6, November 2011
50
COMP2 DELAY FUNCTION
COMP2 has an optional delay function for use when the input signal is noisy. When COMP2 triggers
and the delay is enabled (i.e. COMP2DEL is non-zero), then GPIO bit 14 does not change state
immediately, and no interrupt is generated. Instead, the WM9712L starts a delay timer and checks
COMP2 again after the delay time has passed. If COMP2 is still active, then the GPIO bit is set and
an interrupt may be generated (depending on the state of the GW14 bit). If COMP2 is no longer
active, the GPIO bit is not set, i.e. all register bits are as if COMP2 had never triggered.
Note: If COMP2 triggers while the WM9712L is in sleep mode, and the delay is enabled, then the
device starts the on-chip crystal oscillator in order to count the time delay.
COMP2
TRIGGERS
START TIMER
COMP2?
WAIT
time=COMP2DEL
SHUT DOWN
TIMER
Inactive
Active
SET GI14
END
END
[FALSE ALARM]
COMP2
DEL?
non-zero
C2W?
0
END
1
000
Figure 14 COMP2 Delay Flow Chart



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