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MIC281-4BM6 Datasheet(PDF) 6 Page - Micrel Semiconductor |
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MIC281-4BM6 Datasheet(HTML) 6 Page - Micrel Semiconductor |
6 / 12 page MIC281 Micrel MIC281 6 November 2004 Functional Description Serial Port Operation TheMIC281usesstandardSMBusWrite_ByteandRead_Byte operations for communication with its host. The SMBus Write_Byte operation involves sending the device’s slave address (with the R/W bit low to signal a write operation), followed by a command byte and the data byte. The SMBus Read_Byteoperationisacompositewriteandreadoperation: the host first sends the device’s slave address followed by the command byte, as in a write operation. A new start bit must then be sent to the MIC281, followed by a repeat of the slave address with the R/W bit (LSB) set to the high (read) state. The data to be read from the part may then be clocked out. These protocols are shown in Figures 1 and 2. The Command byte is eight bits (one byte) wide. This byte carries the address of the MIC281 register to be operated upon.Thecommandbytevaluescorrespondingtothevarious MIC281 registers are shown in Table 1. Other command byte values are reserved, and should not be used. S 1 0 0 1 A2 A1 A0 0 A X X X X X X X X A D4 D5 D6 D3 D2 D1 D0 D7 /A P MIC281 Slave Address DATA CLK Command Byte Data Byte to MIC281 START STOP R/W = WRITE ACKNOWLEDGE ACKNOWLEDGE NOT ACKNOWLEDGE Master to slave transfer, i.e., DATA driven by master. Slave to master transfer, i.e., DATA driven by slave. Figure 1. Write_Byte Protocol S 1 0 0 1 X X X X X X 0 A X X X X X X X X A S 1 1 1 0 0 X X X X X X X A X /A P MIC281 Slave Address DATA CLK Command Byte MIC281 Slave Address Data Read From MIC281 START START STOP R/W = WRITE R/W = READ ACKNOWLEDGE ACKNOWLEDGE ACKNOWLEDGE NOT ACKNOWLEDGE Master to slave transfer, i.e., DATA driven by master. Slave to master transfer, i.e., DATA driven by slave. Figure 2. Read_Byte Protocol Command Byte Power-on Target Register Value Default Label Description Read Write TEMP Remote temperature result 01h n/a 00h (0°C) CONFIG Configuration 03h 03h 80h MFG_ID Manufacturer identification FEh n/a 2Ah DEV_ID Device and revision identification FFh n/a 0xh* * The lower nibble contains the die revision level, e.g., Rev 0 = 00h. Table 1. MIC281 Register Addresses |
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