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AMC6821SDBQ Datasheet(PDF) 8 Page - Texas Instruments |
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AMC6821SDBQ Datasheet(HTML) 8 Page - Texas Instruments |
8 / 56 page www.ti.com SMBUS INTERFACE Communication Protocols AMC6821 SBAS386C – MAY 2006 – REVISED JULY 2007 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 that is programmable by properly connecting the address pins A0 and A1. Table 2 shows the selection of the AMC6821 slave address. The address selection pins should be either tied directly to VDD or GND. For the NC condition, they should be unconnected with minimum trace capacitance. Note that the address is checked only on a reset or power-up condition. Table 2. AMC6821 Address Select(1) A0 A1 ADDRESS GND GND 0011000 NC GND 0011010 VDD GND 0011001 GND NC 0101100 NC NC 0101110 VDD NC 0101101 GND VDD 1001100 NC VDD 1001110 VDD VDD 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. Repeated start is not allowed during the read bit. Table 3. 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). Table 4. 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. Table 5. 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). 8 Submit Documentation Feedback Copyright © 2006–2007, Texas Instruments Incorporated Product Folder Link(s): AMC6821 |
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