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MAX6651EEE Datasheet(PDF) 9 Page - Maxim Integrated Products |
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MAX6651EEE Datasheet(HTML) 9 Page - Maxim Integrated Products |
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9 / 25 page  Fan-Speed Regulators and Monitors with SMBus/I2C-Compatible Interface Maxim Integrated 9 MAX6650/MAX6651 tor that overrides the internal oscillator (see General- Purpose Input/Output). When using an external oscillator (fOSC), calculate the Fan-Speed Register value with fCLK equal to fOSC. Codes above F8h (1111 1000) are allowed, but will not significantly decrease the frequency. Configuration-Byte Register The Configuration-Byte Register (Table 4) adjusts the prescaler, changes the tachometer threshold voltage, and sets the mode of operation. The three least-signifi- cant bits configure the prescaler division used to scale the tachometer period. Select the prescaler value so the fan’s full speed is achieved with a register value of approximately 64 (0100 0000) to optimize speed range and resolution (see the Fan Speed Register section). The fourth bit selects the fan operating voltage. The fifth and sixth bits configure the operating mode. The MAX6650/MAX6651 have four modes of operation: full-on, full-off (shutdown), closed-loop, and open-loop. In closed-loop operation, the external microcontroller (µC) sets the desired speed by writing an 8-bit word to the Fan-Speed Register (see the Fan-Speed Register section). The MAX6650/MAX6651 monitor the fan’s tachometer output and automatically adjust the voltage Table 2. Command-Byte Assignments COUNT x SPEED 0000 0000 x CONFIG 0000 0010 x READ GPIO DEF 0000 0100 0001 0110 x x x x WRITE x 02h Tachometer count time FFh 0Ah 00h POR (DEFAULT) STATE COMMAND GPIO definition REGISTER Configuration Fan speed FUNCTION DAC 0000 0110 x x 00h DAC ALARM ENABLE 0000 1000 x x 00h Alarm enable ALARM 0000 1010 x — 00h Alarm status TACH0 0000 1100 x — 00h Tachometer 0 count TACH1 0000 1110 x — 00h Tachometer 1 count TACH2 0001 0000 x — 00h Tachometer 2 count TACH3 0001 0010 x — 00h Tachometer 3 count GPIO STAT 0001 0100 x — 1Fh GPIO status Table 3. Fan Speed * 0000 0000 1.0 * 0000 0001 1.0 * 0000 0010 1.5 KSCALE (ms) * * * tTACH KSCALE 330 500 500 * * * KTACH * * * FAN SPEED (RPS) — * 500 480 — 240 — — — — — — — 0001 1110 16 3.9 * 32 128 64 0001 1111 16 4.0 1.0 31 124 0010 0000 17 4.2 20,000 1.0 30 120 30,000 — — — — — — 30,000 0100 0000 33 8.2 2.1 15.3 61.1 — — — — — — — 1111 1000 125 31 7.8 4 15.9 1900 1900 1800 — 910 — 240 KSCALE * * * — 7700 7400 7200 — 3700 — 960 * * * FAN SPEED (RPM) — * 30,000 29,000 — 15,000 — 3830 4 16 1 1 4 16 1 4 16 *The minimum allowed tachometer period is 1ms. |
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