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XR21V1414IM48 Datasheet(PDF) 4 Page - Exar Corporation |
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XR21V1414IM48 Datasheet(HTML) 4 Page - Exar Corporation |
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4 / 32 page  XR21V1414 4 4-CH FULL-SPEED USB UART REV. 1.1.0 PIN DESCRIPTIONS Pin Description NAME 48-QFN PIN # TYPE DESCRIPTION UART Channel A Signals RXA 31 I UART Channel A Receive Data or IR Receive Data. This pin has an inter- nal pull-up resistor. Internal pull-up resistor is not disabled during suspend mode. TXA 30 O UART Channel A Transmit Data or IR Transmit Data. GPIOA0/RIA# 21 I/O UART Channel A general purpose I/O or UART Ring-Indicator input (active low) or Remote Wakeup Input ( See ”Section 1.5.11, Remote Wakeup” on page 14.). This pin has an internal pull-up resistor which is disabled during suspend mode. If using this GPIO as an input, an exter- nal pull-up resistor is required to minimize the power consumption in the suspend mode. GPIOA1/CDA# 20 I/O UART Channel A general purpose I/O or UART Carrier-Detect input (active low). This pin has an internal pull-up resistor which is disabled dur- ing suspend mode. If using this GPIO as an input, an external pull-up resistor is required to minimize the power consumption in the suspend mode. GPIOA2/DSRA# 17 I/O UART Channel A general purpose I/O or UART Data-Set-Ready input (active low). See ”Section 1.5.5, Automatic DTR/DSR Hardware Flow Control” on page 13. This pin has an internal pull-up resistor which is disabled during suspend mode. If using this GPIO as an input, an external pull-up resistor is required to minimize the power consumption in the suspend mode. GPIOA3/DTRA# 16 I/O UART Channel A general purpose I/O or UART Data-Terminal-Ready out- put (active low). See ”Section 1.5.5, Automatic DTR/DSR Hard- ware Flow Control” on page 13. This pin has an internal pull-up resistor which is disabled during suspend mode. If using this GPIO as an input, an external pull-up resistor is required to minimize the power con- sumption in the suspend mode. GPIOA4/CTSA# 7 I/O UART Channel A general purpose I/O or UART Clear-to-Send input (active low). See ”Section 1.5.4, Automatic RTS/CTS Hardware Flow Control” on page 12. This pin has an internal pull-up resistor which is disabled during suspend mode. If using this GPIO as an input, an external pull-up resistor is required to minimize the power consumption in the suspend mode. GPIOA5/RTSA# 6 I/O UART Channel A general purpose I/O or UART Request-to-Send output (active low). See ”Section 1.5.4, Automatic RTS/CTS Hardware Flow Control” on page 12. This pin has an internal pull-up resistor which is disabled during suspend mode. If using this GPIO as an input, an external pull-up resistor is required to minimize the power consumption in the suspend mode. UART Channel B Signals RXB 9 I UART Channel B Receive Data or IR Receive Data. This pin has an inter- nal pull-up resistor. Internal pull-up resistor is not disabled during suspend mode. |
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