FSA8108 Datasheet, PDF (1/5 Pages) Fairchild Semiconductor – Audio Jack Detection and Configuration Switch, Supports Volume Up/Down & Send/End Keys

August 2012
FSA8108
Audio Jack Detection and Configuration Switch, Supports
Volume Up/Down & Send/End Keys
Features
Detection
V_DD
V_IO
THD (MIC)
LDO Output for MIC Bias
Voltage
ESD (IEC 61000-4-2)
Operating Temperature
Package
Top Mark
Ordering Information
Audio Plug Connection
Volume Up/Down Key Press
Send/End Key Press
2.7 to 4.5V
1.6V to V_DD
0.01% Typical
2.4V
15kV
-40°C to 85°C
12-Ball WLCSP
G6
FSA8108BUCX
Applications
 Cellular Phones, Smart Phones
 MP3 and PMP (Portable Media Player)
Description
The FSA8108 is an audio jack detection switch for 3- or 4-
pole accessories that detects the audio plug connection. The
detection circuit monitors the microphone bias voltage to
detect a volume up/down or send/end key press. For system
flexibility, the FSA8108 features an I²C port with registers to
allow programmability of AC timing specifications.
 Detects 3- or 4-Pole Audio Accessories
 Removes Audio Jack Pop-and-Click Caused by
MIC Bias
 Detects Key Press: Volume Up/Down, Send/End
 Stuck Send/End Key Recovery
 LDO Output for MIC Bias Voltage
Related Resources
 For samples and questions, please contact:
[e-mail].
© 2011 Fairchild Semiconductor Corporation
FSA8108 • Rev. 1.0.0
Figure 1. Typical Application Diagram
www.fairchildsemi.com