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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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MCP7940NT датащи(PDF) 6 Page - Microchip Technology |
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MCP7940NT датащи(HTML) 6 Page - Microchip Technology |
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6 / 36 page  MCP7940N DS25010A-page 6 2011 Microchip Technology Inc. 2.0 PIN DESCRIPTIONS The descriptions of the pins are listed in Table 2-1. FIGURE 2-1: DEVICE PINOUTS 2.1 Serial Data (SDA) This is a bidirectional pin used to transfer addresses and data into and out of the device. It is an open-drain terminal, therefore, the SDA bus requires a pull-up resistor to VCC (typically 10 k for 100 kHz, 2 k for 400 kHz). For normal data transfer SDA is allowed to change only during SCL low. Changes during SCL high are reserved for indicating the Start and Stop conditions. 2.2 Serial Clock (SCL) This input is used to synchronize the data transfer from and to the device. TABLE 2-1: PIN DESCRIPTIONS Pin Name Pin Function Vss Ground SDA Bidirectional Serial Data SCL Serial Clock X1 Xtal Input, External Oscillator Input X2 Xtal Output VBAT Battery Backup Input (3V Typ) MFP Multi Function Pin Vcc +1.8V to +5.5V Power Supply X1 X2 VBAT Vss Vcc MFP SCL SDA 1 2 3 4 8 7 6 5 SOIC/DFN/MSOP/TSSOP |
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