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MAX31790 Datasheet(PDF) 6 Page - Maxim Integrated Products |
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MAX31790 Datasheet(HTML) 6 Page - Maxim Integrated Products |
6 / 43 page MAX31790 6-Channel PWM-Output Fan RPM Controller 6 Maxim Integrated Pin Configuration Pin Description PIN NAME FUNCTION 1 FREQ_START This input is sampled at power-up and sets the power-up value for the PWM output frequency. See the Register Map for values. 2 SPIN_START This input is sampled at power-up and sets the initial spin-up behavior. See the Register Map for values. 3 ADD1 Address Select Inputs. Sampled at the start of every I2C transaction. One of 16 possible addresses can be selected by connecting ADD0 and ADD1 to GND, VCC, SDA, or SCL. 4 ADD0 5 WD_START This input is sampled at power-up and sets the initial I2C watchdog behavior. See the Register Map for values. 6 XTAL2 Pins for Connecting to Optional 32,768Hz Crystal. The crystal can be used when the best RPM precision is required. At POR the internal oscillator is used, and a nominal 32,768Hz clock is pro- duced at CLKOUT. If a crystal is connected between XTAL1 and XTAL2, the crystal oscillator can be enabled by writing to a register. If no crystal is present, ground XTAL1 and leave XTAL2 uncon- nected. 7 XTAL1 8 GND Ground 26 27 25 24 10 9 11 12 12 PWM_START0 45 67 20 21 19 17 16 15 PWM_START1 FULL_SPEED PWMOUT5 TACH5 PWMOUT6 TACH6 3 18 28 8 CLKOUT GND EP + FAN_FAIL 23 13 TACH4 SCL 22 14 PWMOUT4 SDA TQFN (4mm x 4mm) TOP VIEW MAX31790 |
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