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MAX6636 Datasheet(PDF) 7 Page - Maxim Integrated Products |
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MAX6636 Datasheet(HTML) 7 Page - Maxim Integrated Products |
7 / 18 page ed, and the temperature registers are not updated. The previous data is not changed and remains available. SMBus Digital Interface From a software perspective, the MAX6636 appears as a series of 8-bit registers that contain temperature mea- surement 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 same SMBus slave address also provides access to all functions. The MAX6636 employs four standard SMBus protocols: write byte, read byte, send byte, and receive byte (Figure 2). The shorter receive byte protocol allows quicker transfers, provided that the correct data regis- ter 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. Figure 3 is the SMBus write-timing diagram and Figure 4 is the SMBus read-timing diagram. The remote diode 1 measurement channel provides 11 bits of data (1 LSB = 0.125°C). All other temperature- measurement channels provide 8 bits of temperature data (1 LSB = 1°C). The 8 most significant bits (MSBs) can be read from the local temperature and remote temperature registers. The remaining 3 bits for remote diode 1 can be read from the extended temperature 7-Channel Precision Temperature Monitor _______________________________________________________________________________________ 7 Figure 1. Internal Block Diagram DXP1 DXN1 DXP2 DXN2 DXP3 DXN3 DXP4 DXN4 DXP5 DXN5 DXP6 DXN6 INPUT BUFFER 10/100 μA VCC REF COUNT COUNTER COMMAND BYTE REMOTE TEMPERATURES LOCAL TEMPERATURES REGISTER BANK ALERT THRESHOLD OVERT THRESHOLD ALERT RESPONSE ADDRESS ALARM ALU ADC SMBus INTERFACE MAX6636 SCL SDA OVERT AVERT STBY |
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