WM9711 datasheet(38/66 Pages) WOLFSON

Il numero della parte	WM9711

Spiegazioni elettronici	LOW POWER AUDIO CODEC FOR PORTABLE APPLICATIONS

PDF	66 Pages

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Produttore elettronici	WOLFSON [Wolfson Microelectronics plc]

Homepage	http://www.wolfsonmicro.com

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38 / 66 page

WM9711L

Production Data

PD Rev 4.1 April 2004

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 WM9711L 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 WM9711L 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

[FALSE ALARM]

COMP2

DEL?

non-zero

C2W?

END

000

Figure 5 COMP2 Delay Flow Chart

WM9711 Scheda tecnica(PDF) 38 Page - Wolfson Microelectronics plc