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STG3696E 데이터시트(PDF) 9 Page - STMicroelectronics |
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STG3696E 데이터시트(HTML) 9 Page - STMicroelectronics |
9 / 21 page 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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