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MAX6680 Datasheet(PDF) 9 Page - Maxim Integrated Products |
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MAX6680 Datasheet(HTML) 9 Page - Maxim Integrated Products |
9 / 17 page ture registers are not updated. The previous data is not changed and remains available. SMBus Digital Interface From a software perspective, the MAX6680/MAX6681 appear as a series of 8-bit registers that contain tem- perature data, alarm threshold values, and control bits. A standard SMBus-compatible 2-wire serial interface is used to read temperature data and write control bits and alarm threshold data. The device responds to the same SMBus slave address for access to all functions. The MAX6680/MAX6681 employ four standard SMBus protocols: Write Byte, Read Byte, Send Byte, and Receive Byte (Figure 3). The shorter Receive Byte pro- tocol allows quicker transfers, provided that the correct data register was previously selected by a Read Byte instruction. Use caution with the shorter protocols in multimaster systems, since a second master could overwrite the command byte without informing the first master. When the conversion rate is 8Hz, temperature data can be read from the Read Internal Temperature (00h) and Read External Temperature (01h) registers. The tem- perature data format in these registers is 7 bits + sign in two’s-complement form for each channel, with the LSB representing 1°C (Table 2). The MSB is transmitted first. Extended range extends the temperature data range of the local and remote sensor to -64°C. Extended range is activated by setting bit 3 of the Configuration register to 1. When the conversion rate is 4Hz or less, temperature data can be read from the Read Internal Temperature (00h) and Read External Temperature (01h) registers, the same as for faster conversion rates. An additional 3 bits can be read from the Read External Extended Temperature (10h), which extends the remote tempera- ture data to 10 bits + sign and the resolution to 0.125°C per LSB (Table 3). When a conversion is complete, the Main register and the Extended register are updated almost simultane- ously. Ensure that no conversions are completed between reading the Main and Extended registers so that when data that is read by both registers contain the result of the same conversion. ±1°C Fail-Safe Remote/Local Temperature Sensors with SMBus Interface _______________________________________________________________________________________ 9 ACK 7 bits ADDRESS ACK WR 8 bits DATA ACK 1 P 8 bits S COMMAND Write Byte Format Read Byte Format Send Byte Format Receive Byte Format Slave Address: equiva- lent to chip-select line of a 3-wire interface Command Byte: selects which register you are writing to Data Byte: data goes into the register set by the command byte (to set thresholds, configuration masks, and sampling rate) ACK 7 bits ADDRESS ACK WR S ACK 8 bits DATA 7 bits ADDRESS RD 8 bits /// P COMMAND Slave Address: equiva- lent to chip-select line Command Byte: selects which register you are reading from Slave Address: repeated due to change in data- flow direction Data Byte: reads from the register set by the command byte ACK 7 bits ADDRESS WR 8 bits COMMAND ACK P ACK 7 bits ADDRESS RD 8 bits DATA /// P S Command Byte: sends com- mand with no data, usually used for one-shot command Data Byte: reads data from the register commanded by the last Read Byte or Write Byte transmission; also used for SMBus Alert Response return address S = Start condition Shaded = Slave transmission P = Stop condition /// = Not acknowledged Figure 3. SMBus Protocols |
Similar Part No. - MAX6680_05 |
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Similar Description - MAX6680_05 |
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