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MAX31790 Datasheet(PDF) 7 Page - Maxim Integrated Products |
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MAX31790 Datasheet(HTML) 7 Page - Maxim Integrated Products |
7 / 43 page MAX31790 6-Channel PWM-Output Fan RPM Controller 7 Maxim Integrated Pin Description (continued) PIN NAME FUNCTION 9 TACH6 Logic/Analog Inputs for Tach Signals. If a fan has a logic tach output, it can be used for RPM con- trol. For a 2-wire fan, analog input can be used for fan-failure detection. Also functions as a “locked rotor” input. 11 TACH5 13 TACH4 15 TACH3 17 TACH2 19 TACH1 10 PWMOUT6 Open-Drain Output to 4-Wire Fan’s PWM Input or (Less Frequently) to Power Transistor Modulating Fan Power Supply. Can also be used as a tachometer signal input. Can be pulled up as high as 5.5V. 12 PWMOUT5 14 PWMOUT4 16 PWMOUT3 18 PWMOUT2 20 PWMOUT1 21 VCC Power-Supply Input. 3.3V nominal. Bypass VCC to GND with a 0.1FF capacitor. 22 SDA I2C Serial-Data Input/Output, Open Drain. Can be pulled up to 5.5V regardless of VCC. 23 SCL I2C Serial-Clock Input. Can be pulled up to 5.5V regardless of VCC. 24 FAN_FAIL Active-Low, Open-Drain Fan-Failure Output. Active only when fault is present. 25 PWM_START0 These inputs are sampled at power-up and set the power-up value for all PWMOUT duty cycles. See the Register Map for values. 26 PWM_START1 27 FULL_SPEED When low, this input forces all PWM outputs to 100%. Exception: If a fan has failed and “Duty Cycle = 0 on Failure” has been selected for that fan. 28 CLKOUT CMOS Push-Pull 32,768Hz Clock Output. Signal generated from internal oscillator when external crystal is not used. If a crystal is connected between XTAL1 and XTAL2 and enabled, the crystal oscillator generates the output. Output is always active. — EP Exposed Pad. Connect to GND. |
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