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SN250 数据表(PDF) 7 Page - STMicroelectronics |
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SN250 数据表(HTML) 7 Page - STMicroelectronics |
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7 / 130 page  SN250 Pin assignment 7/130 Table 1. Pin descriptions Pin # Signal Direction Description 1 VDD_24MHZ Power 1.8V high-frequency oscillator supply 2 VDD_VCO Power 1.8V VCO supply 3 RF_P I/O Differential (with RF_N) receiver input/transmitter output 4 RF_N I/O Differential (with RF_P) receiver input/transmitter output 5 VDD_RF Power 1.8V RF supply (LNA and PA) 6 RF_TX_ALT_P O Differential (with RF_TX_ALT_N) transmitter output (optional) 7 RF_TX_ALT_N O Differential (with RF_TX_ALT_P) transmitter output (optional) 8 VDD_IF Power 1.8V IF supply (mixers and filters) 9 BIAS_R I Bias setting resistor 10 VDD_PADSA Power Analog pad supply (1.8V) 11 TX_ACTIVE O Logic-level control for external RX/TX switch 12 VDD_PADSA Power Analog pad supply (1.8V) 13 nRESET I Active low chip reset (internal pull-up) 14 OSC32B I/O 32.768kHz crystal oscillator or left open when using external clock on OSC32A 15 OSC32A I/O 32.768kHz crystal oscillator or digital clock input 16 VREG_OUT Power Regulator output (1.8V) 17 VDD_PADS Power Pads supply (2.1–3.6V) 18 VDD_CORE Power 1.8V digital core supply 19 GPIO11 I/O Digital I/O (enable GPIO11 with GPIO_CFG[7:4]) nCTS I UART CTS handshake of Serial Controller SC1 (enable SC1-4A with GPIO_CFG[7:4], select UART with SC1_MODE) MCLK O SPI master clock of Serial Controller SC1 (enable SC1-3M with GPIO_CFG[7:4], select SPI with SC1_MODE, enable master with SC1_SPICFG[4]) TMR2IA.1 I Capture Input A of Timer 2 (enable CAP2-0 with GPIO_CFG[7:4]) 20 GPIO12 I/O Digital I/O (enable GPIO12 with GPIO_CFG[7:4]) nRTS O UART RTS handshake of Serial Controller SC1 (enable SC1-4A with GPIO_CFG[7:4], select UART with SC1_MODE) TMR2IB.1 I Capture Input B for Timer 2 (enable CAP2-0 with GPIO_CFG[7:4]) |
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