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FSA8058 Datasheet(PDF) 3 Page - Fairchild Semiconductor

Part No. FSA8058
Description  Audio Jack Detection and Configuration Switch with Moisture Sensing
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Maker  FAIRCHILD [Fairchild Semiconductor]
Homepage  http://www.fairchildsemi.com
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FSA8058 Datasheet(HTML) 3 Page - Fairchild Semiconductor

   
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© 2012 Fairchild Semiconductor Corporation
www.fairchildsemi.com
FSA8058
• Rev. 1.0.0
3
Operation and Application Description
Moisture Issue
Mobile device manufacturers today face a customer
experience issue when liquid/moisture enters the audio
jack connector housing and causes electrical shorts
between
metal
connectors.
The
mobile
device
recognizes it as an accessory insert, resulting in the
mobile device rerouting all the audio signals though the
audio jack path, where the end user loses all audio
function on the device.
Moisture Detection
The FSA8058 automatically detects moisture on the
J_DET pin. If there is moisture, the device enters
Moisture Mode and monitors for a real accessory insert.
It remains in Moisture Mode until the device no longer
detects moisture on the J_DET pin.
1
2
3
4
Baseband
Processor
GPIO1
GPIO2
GPIO3
GPIO4
Audio
CODEC
MIC Bias
MIC
L SPKR
R SPKR
Audio Jack
1
2 3 4
Oscillator
Logic
Jack Detection
(Moisture)
VDD
2.5 to 4.5V
J_MIC
MIC
GND
DET
EN
JPOLE
S/E
VIO
1.6 to VDD
J_DET
FSA8058
MIC
Detection
Key Press
Detection
Figure 3.
Typical Application Diagram


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