TS3A225E
www.ti.com
SCDS329A – AUGUST 2012 – REVISED MAY 2013
AUTONOMOUS AUDIO HEADSET SWITCH
Check for Samples: TS3A225E
FEATURES
APPLICATIONS
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VDD Range = 2.7 V to 4.5 V
Break Before Make Stereo Jack Switches
Ron for Ground FET Switches
– WCSP Package: 70 mΩ
– QFN Package: 100 mΩ
Autonomous Detection of GND and MIC
Connections
Detection Triggered by I2C or External Trigger
Pin
HDA Compatible MIC Present Indicator
1.8V Compatible I2C Switch Control
ESD Performance Tested Per JESD 22:
– 2000-V Human-Body Model (A114-B, Class
II)
– 500-V Charged-Device Model (C101)
ESD Performance (SLEEVE, RING2, TIP)
– ±8-kV Contact Discharge (IEC 61000-4-2)
Mobile Phones/ Tablet PCs
Notebook Computers
DESCRIPTION
The TS3A225E is an audio headset switch device.
The device detects the presence of an analog
microphone and switches a system analog
microphone pin between different connectors in an
audio stereo jack. The microphone connection in a
stereo connector can be swapped with the ground
connection depending on manufacturer. When the
TS3A225E detects a certain configuration, the device
automatically connects the microphone line to the
appropriate pin. The device also reports the presence
of an analog microphone on an audio stereo jack.
In some systems, it is desirable to connect the stereo
jack pin to ground. The TS3A225E provides two
internal low resistance (
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