WM9711LEFT/RV 데이터 시트보기 (PDF) - Wolfson Microelectronics plc

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WM9711LEFT/RV

Low Power Audio CODEC for Portable Applications

Wolfson Microelectronics plc 

Production Data

JACK INSERT DETECTION

WM9711L

The circuit diagram below shows how to detect when a headphone or headset has been plugged into

the headphone socket. It generates an interrupt, instructing the controller to enable HPOUTL and

HPOUTR and disable OUT3.

interrupt

logic

HPOUTR

-

HPOUTL

-

GPIO

switch closes

on insertion

LR

Figure 22 Jack Insert Detection Circuit

The circuit requires a headphone socket with a switch that closes on insertion. It detects both

headphones and phone headsets. Any GPIO pin can be used, provided that it is configured as an

input.

HOOKSWITCH DETECTION

The circuit diagram below shows how to detect when the “hookswitch” of a phone headset is pressed

(pressing the hookswitch is equivalent to lifting the receiver in a stationary telephone).

WM9711L

interrupt

logic

HPOUTR

-

HPOUTL

AGND

-

MICL/MICR

GPIO

MICBIAS

680Ω − 2.2kΩ

LR

MIC

47Ω

HOOK

SWITCH

PHONE HEADSET

Figure 23 Hookswitch Detection Circuit

The circuit uses a GPIO pin as a sense input. The impedance of the microphone and the resistor in

the MICBIAS path must be such that the potential at the GPIO pin is above 0.7×DBVDD when the

hookswitch is open, and below 0.3×DBVDD when it is closed.

w

PD Rev 4.1 April 2004

63

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