© 2011 Fairchild Semiconductor Corporation

www.fairchildsemi.com

FSA850 • Rev. 1.12

3

Pin Assignments

3

2

1

A

B

C

MIC/GND1A

MIC/GND1B

MIC/GND2B

MIC/GND2A

D

GND

GND

Vcc

S0

S1

GND

MIC

SENSE

Figure 3. Pin Assignments (Top Through View, Top Mark Side)

Pin Descriptions

Name

Ball #

Type

Description

MIC

A2

Switch Microphone, connects to microphone pre-amplifier

SENSE

A3

Switch Sense pin to detect GND offset

S0, S1

B3, B1

Input

MIC, SENSE, and MIC/GNDn switch-select pin

MIC/GND1A

D3

Switch GND switch, connects to pole 3 of audio jack

MIC/GND2A

C3

Switch GND switch, connects to pole 3 of audio jack

MIC/GND1B

D1

Switch GND switch, connects to pole 4 of audio jack

MIC/GND2B

C1

Switch GND switch, connects to pole 4 of audio jack

A1

Power Supply voltage

GND

B2,C2,D2 Ground Ground for both the audio jack and PCB