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AMC6821SDBQ Datasheet(PDF) 6 Page - Burr-Brown (TI) |
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AMC6821SDBQ Datasheet(HTML) 6 Page - Burr-Brown (TI) |
6 / 47 page www.ti.com SMBUS INTERFACE Communication Protocols AMC6821 SBAS386A – MAY 2006 – REVISED MAY 2006 The AMC6821 communicates through the serial system management bus (SMBus). The AMC6821 is connected to this bus as a slave device, under the control of a bus master. The AMC6821 has a 7-bit serial bus address, which is programmable by properly connecting the address pins A0 and A1. Table 1 shows the selection of the AMC6821 slave address. Table 1. AMC6821 Address Select A0 A1 ADDRESS GND GND 0011000 NC(1) GND 0011010 VD GND 0011001 GND NC 0101100 NC NC 0101110 VD NC 0101101 GND VD 1001100 NC VD 1001110 VD VD 1001101 (1) NC = No connection. The AMC6821 employs four standard SMBus protocols: the send byte, receive byte, write byte, and read byte. All other operations result in undefined results. Send Byte S SLAVE ADDRESS WR ACK COMMAND ACK P 7-bit AMC6821 slave address 8-bit register address S = start condition; P = stop condition; shaded = slave to master; unshaded = master to slave; WR = write (bit value of 0). Receive Byte S SLAVE ADDRESS RD ACK DATA NACK P 8-bit data from the register selected 7-bit AMC6821 slave address previously S = start condition; P = stop condition; shaded = slave to master; unshaded = master to slave; RD = read (bit value of 1); NACK = not acknowledged. Write Byte S SLAVE ADDRESS WR ACK COMMAND ACK DATA ACK P 7-bit AMC6821 slave address 8-bit register address 8-bit data written to register S = start condition; P = stop condition; shaded = slave to master; unshaded = master to slave; WR = write (bit value of 0). 6 Submit Documentation Feedback |
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