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EMC1023-2-ACZL-TR Datasheet(PDF) 7 Page - SMSC Corporation |
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EMC1023-2-ACZL-TR Datasheet(HTML) 7 Page - SMSC Corporation |
7 / 19 page 1°C Triple Temperature Sensor with Resistance Error Correction Datasheet SMSC EMC1023 7 Revision 1.2 (04-15-05) DATASHEET Chapter 3 System Management Bus Interface Protocol A host controller, such as an SMSC I/O controller, communicates with the EMC1023 via the two wire serial interface named SMBus. The SMBus interface is used to read and write registers in the EMC1023, which is a slave-only device. A detailed timing diagram is shown in Figure 3.1. Figure 3.1 System Management Bus Timing Diagram The EMC1023 implements a subset of the SMBus specification and supports Write Byte, Read Byte, Send Byte, Receive Byte, and Alert Response Address protocols. as shown. In the tables that describe the protocol, the “gray” columns indicate that the slave is driving the bus. 3.1 Write Byte The Write Byte protocol is used to write one byte of data to the registers as shown below: 3.2 Read Byte The Read Byte protocol is used to read one byte of data from the registers as shown below: 3.3 Send Byte The Send Byte protocol is used to set the Internal Address Register to the correct Address. The Send Byte can be followed by the Receive Byte protocol described below in order to read data from the register. The send byte protocol cannot be used to write data - if data is to be written to a register then the write byte protocol must be used as described in subsection above. The send byte protocol is shown in Table 3.3, “SMBus Send Byte Protocol,” on page 7. Table 3.1 SMBus Write Byte Protocol START SLAVE ADDRESS WR ACK COMMAND ACK DATA ACK STOP 17 1 18 18 11 Table 3.2 SMBus Read Byte Protocol START SLAVE ADDRESS WR ACK COMMAND ACK START SLAVE ADDRESS RD ACK DATA NACK STOP 17 1 18 11 7 1 1 81 1 Table 3.3 SMBus Send Byte Protocol FIELD: START SLAVE ADDR WR ACK REG. ADDR ACK STOP Bits: 17 1 1 8 1 1 SMDATA SMCLK T LOW T R T HIGH T F T BUF T HD:STA P S S - Start Condition P - Stop Condition T HD:DAT TSU:DAT T SU:STA T HD:STA P T SU:STO S |
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