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MAX6648-MAX6692 Datasheet(PDF) 7 Page - Maxim Integrated Products |
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MAX6648-MAX6692 Datasheet(HTML) 7 Page - Maxim Integrated Products |
7 / 17 page Precision SMBus-Compatible Remote/Local Temperature Sensors with Overtemperature Alarms _______________________________________________________________________________________ 7 2) If the MAX6648/MAX6692 are in run mode, read the status byte. If the BUSY bit indicates that a conversion is in progress, wait until the conversion is complete (BUSY bit set to zero) before reading the temperature data. Following a conversion completion, immediately read the contents of the temperature data registers. If no conversion is in progress, the data can be read within a few microseconds, which is a sufficiently short period of time to ensure that a new conversion cannot be completed until after the data has been read. SMBCLK AB C D E FG H I J K SMBDATA tSU:STA tHD:STA tLOW tHIGH tSU:DAT tHD:DAT tSU:STO tBUF A = START CONDITION B = MSB OF ADDRESS CLOCKED INTO SLAVE C = LSB OF ADDRESS CLOCKED INTO SLAVE D = R/W BIT CLOCKED INTO SLAVE E = SLAVE PULLS SMBDATA LINE LOW L M F = ACKNOWLEDGE BIT CLOCKED INTO MASTER G = MSB OF DATA CLOCKED INTO MASTER H = LSB OF DATA CLOCKED INTO MASTER I = MASTER PULLS DATA LINE LOW J = ACKNOWLEDGE CLOCKED INTO SLAVE K = ACKNOWLEDGE CLOCK PULSE L = STOP CONDITION M = NEW START CONDITION Figure 2. SMBus Write Timing Diagram 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) 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 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 1. SMBus Protocols S ADDRESS RD ACK DATA /// P 7 bits 8 bits WR S ACK COMMAND ACK P 8 bits ADDRESS 7 bits P 1 ACK DATA 8 bits ACK COMMAND 8 bits ACK WR ADDRESS 7 bits S S ADDRESS WR ACK COMMAND ACK S ADDRESS 7 bits 8 bits 7 bits RD ACK DATA 8 bits /// P |
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