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STG3696E 데이터시트(PDF) 9 Page - STMicroelectronics

부품명 STG3696E
상세설명  Low voltage dual SPDT switch for USB/audio signal switching with 8 kV ESD protection
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제조업체  STMICROELECTRONICS [STMicroelectronics]
홈페이지  http://www.st.com
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STG3696E
Operation
Doc ID 18165 Rev 2
9/21
5
Operation
5.1
Overvoltage fault protection
STG3696E features an overvoltage fault protection in compliance to USB fault protection
specification. The fault protection circuitry is triggered when the voltage on the COMn
channels raise above VOVDT. The overvoltage fault protection helps to protect the switch and
USB transceiver from being damaged by excessive voltage levels.
5.2
Negative charge pump for negative rail audio signaling
STG3696E uses a negative charge pump to generate a negative supply which allows the
audio signal to swing below ground (up to VCC – 5.0 V) on the AUn channels. If the device
fault protection is activated when the voltage on the COMn channels raise above VOVDT,
there must not be a negative voltage attached to the AUn channels.
5.3
VBUS detection feature
The connection between USBn and COMn is triggered when VBUS voltage is detected to be
higher than VBUSTHRES. If VBUS is constantly present in the application, driving the audio
override enable (AOVR) high will connect the AUn channels to the COMn channels. If AOVR
is low, the switching between AUn and USBn is controlled by the VBUS detection.
5.4
Pop noise suppression
When the AUn channels are not connected to the COMn channels, the AUn channels are
automatically connected to 200
Ω shunt resistors which helps to discharge any capacitance
built up on the AUn channels. This will reduce the possibility of pop and click noise
occurrence when switching between USB and audio sources.


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