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MAX6639 データシート(PDF) 13 Page - Maxim Integrated Products |
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MAX6639 データシート(HTML) 13 Page - Maxim Integrated Products |
13 / 22 page Global Configuration Register (04h) The global configuration register controls the shutdown mode, power-on reset, SMBus timeout, and tempera- ture channel 2 source select: • D7: Run/Standby. Normal operation is run (0). Setting this bit to 1 suspends conversions and puts the MAX6639 into low-power sleep mode. • D6: Software POR. Writing a 1 resets all registers to their default values. • D5: SMBus Timeout Disable. Writing a zero enables SMBus timeout for prevention of bus lockup. When the timeout function is enabled, the SMBus interface is reset if SDA or SCL remains low for more than 74ms (typ). • D4: Temperature Channel 2 Source. Selects either local or remote 2 as the source for temperature channel 2 register data. Writing a zero to this bit selects remote 2 for temperature channel 2. • D3: PWM Output Frequency Range. Selects either the 20Hz to 100Hz range or the 5kHz to 25kHz range for the PWM outputs (see Table 9). Extended Temperature Registers (05h and 06h) These registers contain the extended temperature data from channels 1 and 2. Bits D[7:5] contain the 3 LSBs of the temperature data. The bit values are 0.5 °C, 0.25 °C, and 0.125°C. When bit 0 is set to 1, a diode fault has been detected. Channel 1 and Channel 2 ALERT, OT, and THERM Limits (08h Through 0Dh) These registers contain the temperatures above which the ALERT, THERM, and OT status bits set and outputs assert (for the temperature channels that are not masked). The data format is the same as that of the channel 1 and channel 2 temperature registers: the LSB weight is +1 °C and the MSB is +128°C. 2-Channel Temperature Monitor with Dual, Automatic, PWM Fan-Speed Controller ______________________________________________________________________________________ 13 READ/ WRITE REGISTER NO. ADDRESS POR STATE FUNCTION D7 D6 D5 D4 D3 D2 D1 D0 W 26h 0011 1100 Fan 1 target duty cycle MSB —— ———— LSB R 27h 0000 0000 Fan 2 current duty cycle MSB —— ———— LSB W 27h 0011 1100 Fan 2 target duty cycle MSB —— ———— LSB R/W 28h 0100 000 Channel 1 minimum fan-start temperature MSB —— ———— LSB R/W 29h 0100 0000 Channel 2 minimum fan-start temperature MSB —— ———— LSB R 3Dh 0101 1000 Read device ID 010 11000 R 3Eh 0100 1101 Read manufacturer ID 010 01101 R 3Fh 0000 0000 Read device revision 000 00000 Table 4. Register Map (continued) |
同様の部品番号 - MAX6639 |
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同様の説明 - MAX6639 |
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