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ADM1075-2ACPZ-RL7 Datasheet(PDF) 30 Page - Analog Devices |
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ADM1075-2ACPZ-RL7 Datasheet(HTML) 30 Page - Analog Devices |
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30 / 52 page  ADM1075 Data Sheet Rev. A | Page 30 of 52 Sr A SLAVE ADDRESS A R SA W SLAVE ADDRESS COMMAND CODE A BYTE COUNT = N A DATA BYTE 1 P DATA BYTE N A DATA BYTE 2 Sr A SLAVE ADDRESS A R SA W SLAVE ADDRESS COMMAND CODE A BYTE COUNT = N A DATA BYTE 1 A DATA BYTE N P PEC A DATA BYTE 2 MASTER TO SLAVE SLAVE TO MASTER A A Figure 61. Block Read and Block Read with PEC MASTER TO SLAVE SLAVE TO MASTER ALOW DATA BYTE A SA W DEVICE 1 ADDRESS COMMAND CODE 1 A HIGH DATA BYTE ONE OR MORE DATA BYTES ALOW DATA BYTE A Sr A W DEVICE 2 ADDRESS COMMAND CODE 2 A HIGH DATA BYTE ONE OR MORE DATA BYTES ALOW DATA BYTE A Sr A W DEVICE N ADDRESS COMMAND CODE N AP HIGH DATA BYTE ONE OR MORE DATA BYTES Figure 62. Group Command MASTER TO SLAVE SLAVE TO MASTER A PEC 1 P A LOW DATA BYTE A SA W DEVICE 1 ADDRESS COMMAND CODE 1 A HIGH DATA BYTE ONE OR MORE DATA BYTES A PEC 2 A LOW DATA BYTE A Sr A W DEVICE 2 ADDRESS COMMAND CODE 2 A HIGH DATA BYTE ONE OR MORE DATA BYTES A PEC N A LOW DATA BYTE A Sr A W DEVICE N ADDRESS COMMAND CODE N A HIGH DATA BYTE ONE OR MORE DATA BYTES Figure 63. Group Command with PEC GROUP COMMANDS The PMBus standard defines what are known as group commands. Group commands are single bus transactions that send commands or data to more than one device at the same time. Each device is addressed separately, using its own address; there is no special group command address. A group command transaction can contain only write commands that send data to a device. It is not possible to use a group command to read data from devices. From an I2C protocol point of view, a normal write command consists of the following: • I2C start condition • Slave address bits and a write bit (followed by ACK from the slave device) • One or more data bytes (each of which is followed by ACK from the slave device) • I2C stop condition to end the transaction A group command differs from a nongroup command in that, after the data is written to one slave device, a repeated start condition is put on the bus followed by the address of the next slave device and data. This continues until all the devices have been written to, at which point the stop condition is put on the bus by the master device. The format of a group command and a group command with PEC is shown in Figure 63. Each device that is written to as part of the group command does not immediately execute the command written. The device must wait until the stop condition appears on the bus. At that point, all devices execute their commands at the same time. Using a group command, it is possible, for example, to turn multiple PMBus devices on or off at the same time. In the case of the ADM1075, it is also possible to issue a power monitor command that initiates a conversion, causing multiple ADM1075 devices to sample together at the same time. This is analogous to connecting the GPO1/ALERT1/CONV pins together and configuring the pin in the convert (CONV) mode to drive the power monitor sampling. |
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