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MCP47FXB2XT-EST Scheda tecnica(PDF) 52 Page - Microchip Technology |
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MCP47FXB2XT-EST Scheda tecnica(HTML) 52 Page - Microchip Technology |
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52 / 124 page  MCP47FXBX4/8 DS20006368A-page 52 2020 Microchip Technology Inc. 3.7 I2C - Serial Data Pin (SDA) The SDA pin is the serial data pin of the I2C interface. The SDA pin is used to write or read the DAC registers and Configuration bits. The SDA pin is an open-drain, N-channel driver. Therefore, it needs an external pull-up resistor from the VDD line to the SDA pin. Except for Start and Stop conditions, the data on the SDA pin must be stable during the high period of the clock. The High or Low state of the SDA pin can only change when the clock signal on the SCL pin is low. See Section 6.0 “I2C Serial Interface Module”. 3.8 A0 and A1 Slave Address Bits These pins control the last two bits of the I2C address. Connect them to VDD to make the corresponding address bit a ‘1’, or to VSS for a ‘0’. See Section 6.8 “Device I2C Slave Addressing” and Register 4-5 for more details. 3.9 No Connect (NC) The NC pins are not connected to the device. 3.10 Exposed Pad This pad is conductively connected to the device's substrate. It should be tied to the same potential as the VSS pin (or left unconnected). This pad could be used to assist in heat dissipation for the device, when con- nected to a PCB heat sink. The pad is only present on the VQFN package. |
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