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ST7538Q 数据表(PDF) 6 Page - STMicroelectronics |
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ST7538Q 数据表(HTML) 6 Page - STMicroelectronics |
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6 / 44 page ![]() Pin settings ST7538Q 6/44 2.2 Pin description Table 1. Pin description Pin N° Name Type Description 1 CD_PD Digital/Output Carrier, Preamble or Frame Header Detect Output. "1" No Carrier, Preamble or Frame Header Detected "0" Carrier, Preamble or Frame Header Detected 2 DVss Supply Digital Ground 3 RxD Digital/Output RX Data Output. 4 RxTx Digital/Input with internal pull-up Rx or Tx mode selection input. "1" - RX Session "0" - TX Session 5 TxD Digital/Input with internal pull-down TX Data Input. 6 GND Supply Substrate Ground (same function as PIN 41) 7 TOUT Digital/Output TX Time Out Event Detection "1" - Time Out Event Occurred "0" - No Time-out Event Occurred 8 CLR/T Digital/Output Synchronous Mains Access Clock or Control Register Access Clock 9 BU Digital/Output Band in use Output. "1" Signal within the Programmed Band "0" No Signal within the Programmed Band 10 DVdd Supply Digital Supply Voltage or 3.3V Voltage Regulator Output 11 MCLK Digital/Output Master Clock Output 12 RSTO Digital/Output Power On or Watchdog Reset Output 13 UART/SPI Digital/Input with internal pull-down Interface type: “0” - Serial Peripheral Interface “1” - UART Interface 14 WD Digital/Input with internal pull-up Watchdog input. The Internal Watchdog Counter is cleared on the falling edges. 15 ZCOUT Digital/Output Zero Crossing Detection Output 16 ZCIN(1) Analog/Input Zero Crossing AC Input. 17 NC Floating Must be connected to DVss. 18 DVss Supply Digital Ground 19 ATOP1 Power/Output Power Line Driver Output 20 PAVss Supply Power Analog Ground 21 ATOP2 Power/Output Power Line Driver Output 22 PAVCC Supply Power Supply Voltage 23 CL(2) Analog/Input Current Limiting Feedback. A resistor between CL and AVss sets the PLI Current Limiting Value An integrated 80pF filtering input capacitance is present on this pin 24 ATO Analog/Output Small Signal Analog Transmit Output |
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