Details

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Fan Controller Interface 8-TDFN (2x3)

Parameter	Symbol	Conditions	Min	Typ	Max	Unit
Operating Supply Voltage	VDD	Normal operation	2.7		5.5	V
Operating Temperature	TA	Commercial temperature range	-40		85	°C
Shutdown Current	ISD	VDD = 3.3V, THERM = GND		1		μA
Active Current	IOP	All outputs enabled, VDD = 3.3V		300		μA
Fan PWM Frequency	FPWM	Default setting		25		kHz
Remote Diode Accuracy	ΔT	VDD = 3.3V, -40°C to +125°C	-1		+1	°C
Local Temperature Range	TL		-40		125	°C
Remote Temperature Range	TR		-40		150	°C

Instructions for MAX31740ATA+

1. Power Supply Connection:

   • Connect the VDD pin to a power supply within the operating voltage range (2.7V to 5.5V).
   • Ensure the GND pin is connected to the system ground.

2. Temperature Sensing:

   • Connect the remote diode inputs (TDI+, TDI-) to the external temperature sensor diode.
   • For local temperature sensing, use the integrated sensor without additional connections.

3. Fan Control:

   • Connect the PWM output to the fan control input.
   • Adjust the PWM frequency if necessary using configuration settings.

4. Shutdown Mode:

   • To enter shutdown mode, pull the THERM pin low.
   • This reduces power consumption to approximately 1μA.

5. Configuration:

   • Use the I2C interface to configure parameters such as temperature thresholds and PWM settings.
   • Refer to the datasheet for specific I2C commands and register addresses.

6. Monitoring and Alert:

   • Monitor temperature readings through the I2C interface.
   • Set up alert thresholds to generate interrupts when temperatures exceed specified limits.

For detailed specifications and advanced configurations, refer to the official Maxim Integrated datasheet for the MAX31740ATA+.

(For reference only)