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XR21V1412IL32 Datasheet(PDF) 5 Page - Exar Corporation |
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XR21V1412IL32 Datasheet(HTML) 5 Page - Exar Corporation |
5 / 30 page XR21V1412 5 REV. 1.1.0 2-CH FULL-SPEED USB UART GPIOB1/CDB# 21 I/O UART Channel B general purpose I/O or UART Carrier-Detect input (active low). 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. GPIOB2/DSRB# 20 I/O UART Channel B 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 11. 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 mini- mize the power consumption in the suspend mode. GPIOB3/DTRB# 19 I/O UART Channel B general purpose I/O or UART Data-Terminal-Ready output (active low). See ”Section 1.5.5, Automatic DTR/DSR Hardware Flow Control” on page 11. This pin has an internal pull-up resistor which is disabled during sus- pend mode. If using this GPIO as an input, an external pull-up resistor is required to minimize the power consumption in the suspend mode. GPIOB4/CTSB# 18 I/O UART Channel B 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 10. 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 mini- mize the power consumption in the suspend mode. GPIOB5/RTSB# 17 I/O UART Channel B 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 10. 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 mini- mize the power consumption in the suspend mode. USB Interface Signals USBD+ 30 I/O USB port differential data plus. This pin has a 1.5 K Ohm internal pull-up resistor. USBD- 29 I/O USB port differential data minus. I2C Interface Signals SDA 25 OD I2C-controller data input/output (open-drain). An optional external I2C EEPROM can be used to store default configurations upon power-up including the USB Vendor ID and Device ID. See Table 3. A pull-up resisitor (typically 4.7 to 10 KOhms) is required. If an EEPROM is not used, this pin can be used with the SCL pin to select the Remote Wake-up and Power modes. An external pull-up or pull-down resistor is required. See Table 2. SCL 26 I I2C-controller serial input clock. An optional external I2C EEPROM can be used to store default configurations upon power-up including the USB Vendor ID and Device ID. See Table 3. A pull-up resisitor (typically 4.7 to 10 KOhms) is required. If an EEPROM is not used, this pin can be used with the SDA pin to select the Remote Wake-up and Power modes. An external pull-up or pull-down resistor is required. See Table 2. Pin Description NAME 32-QFN PIN # TYPE DESCRIPTION |
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