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STR720-EVAL bảng dữ liệu(PDF) 9 Page - STMicroelectronics |
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STR720-EVAL bảng dữ liệu(HTML) 9 Page - STMicroelectronics |
9 / 32 page STR720-EVAL 2 Hardware 8/31 2.7 Power supplies Power to the board is supplied using a lump in cord power supply providing 5 V to the board. All other required voltages are provided on-board by voltage regulators or voltage convertors. 2.8 USB full speed interface USB full speed interface device supported by a type B connector. The USB clock uses a separate 48 MHz oscillator. See Section 3.1: USB on page 14. 2.9 CAN interface A general purpose, asynchronous serial I/O data port connected through a 9-pin D-type male connector with microswitch selectable low speed fault tolerant transceiver (L9669) or low or high speed selectable transceiver (L9616). See Section 3.2: CAN bus connector on page 14. The L9669 transceiver only works in normal mode, the wake-up functionality is not implemented. Caution: The board schematic for the CAN interface detailed in Section 4.10: STR720-Eval board - CAN interface, is not a reference design and should not be copied. To design a CAN interface with the STR720 please refer to the “STR720 Hardware Development Getting Started Guide AN1907”. 2.10 RS232 serial interfaces Two general purpose, asynchronous serial I/O data ports are connected through 9-pin D-type male connectors. Refer to Section 3.3: RS232 serial data connector on page 15. RS232-A connects directly to UART1, transmit and receive only. RS232-B connects to UART2, transmit and receive only. RTS is shorted to CTS and DTR is shorted to DSR at the connector for both interfaces. 2.11 Analog input The following analog inputs are provided, see the schematics Section 4.1 on page 18: ● ADC connector: CN4, ● LM35 temperature sensor IC4 is connected to pin 4 of the ADC connector CN4 (pins 3 and 4 must be shorted to enable temperature sensing,) ● variable resistor VR1 is connected to pin 2 of the ADC connector CN4 (pins 1 and 2 must be shorted to enable the variable resistor.) |
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