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MCP465X Datasheet(PDF) 48 Page - Microchip Technology |
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MCP465X Datasheet(HTML) 48 Page - Microchip Technology |
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48 / 102 page  MCP453X/455X/463X/465X DS22096B-page 48 2008-2013 Microchip Technology Inc. 6.2.7 GENERAL CALL The General Call is a method that the “Master” device can communicate with all other “Slave” devices. In a Multi-Master application, the other Master devices are operating in Slave mode. The General Call address has two documented formats. These are shown in Figure 6-11. We have added a MCP45XX/46XX format in this figure as well. This will allow customers to have multiple I2C Digital Potentiometers on the bus and have them operate in a synchronous fashion (analogous to the DAC Sync pin functionality). If these MCP45XX/46XX 7-bit com- mands conflict with other I2C devices on the bus, then the customer will need two I2C busses and ensure that the devices are on the correct bus for their desired application functionality. Dual Pot devices cannot update both Pot0 and Pot1 from a single command. To address this, there are General Call commands for the Wiper 0, Wiper 1, and the TCON registers. Table 6-3 shows the General Call commands. Three commands are specified by the I2C specification and are not applicable to the MCP45XX/46XX (so com- mand is Not Acknowledged) The MCP45XX/46XX General Call commands are Acknowledge. Any other command is Not Acknowledged. TABLE 6-3: GENERAL CALL COMMANDS Note: There is only one General Call command per General Call control byte (address). Any additional General Call commands are ignored and Not Acknowledged. 7-bit Command (1, 2, 3) Comment ‘1000 00d’b Write Next Byte (Third Byte) to Volatile Wiper 0 Register ‘1001 00d’b Write Next Byte (Third Byte) to Volatile Wiper 1 Register ‘1100 00d’b Write Next Byte (Third Byte) to TCON Register ‘1000 010’b or ‘1000 011’b Increment Wiper 0 Register ‘1001 010’b or ‘1001 011’b Increment Wiper 1 Register ‘1000 100’b or ‘1000 101’b Decrement Wiper 0 Register ‘1001 100’b or ‘1001 101’b Decrement Wiper 1 Register Note 1: Any other code is Not Acknowledged. These codes may be used by other devices on the I2C bus. 2: The 7-bit command always appends a “0” to form 8-bits. . 3: “d” is the D8 bit for the 9-bit write value. |
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