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MAX6639 Datasheet(PDF) 7 Page - Maxim Integrated Products |
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MAX6639 Datasheet(HTML) 7 Page - Maxim Integrated Products |
7 / 22 page SMBus Digital Interface From a software perspective, the MAX6639 appears as a set of byte-wide registers. This device uses a stan- dard SMBus 2-wire/I2C-compatible serial interface to access the internal registers. The MAX6639 features an address select input (ADD) that allows the MAX6639 to have three unique addresses (see Table 1). The MAX6639 employs four standard SMBus protocols: write byte, read byte, send byte, and receive byte (Figures 1, 2, and 3). The shorter receive byte protocol allows quicker transfers, provided that the correct data register was previously selected by a read byte instruc- tion. Use caution with the shorter protocols in multimas- ter systems, since a second master could overwrite the command byte without informing the first master. Table 4 details the register addresses and functions, whether they can be read or written to, and the power- on reset (POR) state. See Tables 5–9 for all other regis- ter functions and the Register Descriptions section. Temperature Reading Temperature data can be read from registers 00h and 01h. The temperature data format for these registers is 8 bits, with the LSB representing 1°C (Table 2) and the MSB representing +128°C. The MSB is transmitted first. Three additional temperature bits provide resolution down to 0.125 °C and are in the channel 1 extended temperature (05h) and channel 2 extended temperature (06h) registers. All values below 0°C clip to 00h. 2-Channel Temperature Monitor with Dual, Automatic, PWM Fan-Speed Controller _______________________________________________________________________________________ 7 SCL A = START CONDITION B = MSB OF ADDRESS CLOCKED INTO SLAVE C = LSB OF ADDRESS CLOCKED INTO SLAVE D = R/W BIT CLOCKED INTO SLAVE AB C D E FG HI J SDA tSU:STA tHD:STA tLOW tHIGH tSU:DAT tSU:STO tBUF LM K E = SLAVE PULLS SMBDATA LINE LOW F = ACKNOWLEDGE BIT CLOCKED INTO MASTER G = MSB OF DATA CLOCKED INTO SLAVE H = LSB OF DATA CLOCKED INTO SLAVE 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 SCL AB C D E FG H I J K SDA 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 3. SMBus Read Timing Diagram ADD INPUT STATE I2C SLAVE ADDRESS BINARY EQUIVALENT VCC 5Eh 0101 111 Floating 5Ch 0101 110 GND 58h 0101 100 Table 1. I2C Slave Address |
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