MAX31760AEE+T

MAX31760AEE+T is a precision fan-speed controller with a non-volatile lookup table. It integrates temperature sensing along with precision PWM fan control. It accurately measures its local die temperature and the remote temperature of a discrete diode-connected transistor, such as a 2N3906, or a thermal diode commonly found on CPUs, graphics processor units (GPUs), and other ASICs. Multiple temperature thresholds, such as local high/overtemperature (OT) and remote high/overtemperature, can be set by an I2C-compatible interface. Fan speed is controlled based on the temperature reading as an index to a 48-byte lookup table (LUT) containing user-programmed PWM values. The flexible LUT-based architecture enables the user to program a smooth nonlinear fan speed vs. temperature transfer function to minimize acoustic fan noise. Typical applications are servers, networking equipment, STB/DVR, NAS/DAS.

• Operating settings stored in non-volatile memory for automatic operation at power-on
• 48-step non-volatile LUT maps temperature to PWM duty cycle
• Smooth PWM duty-cycle transitions minimize audibility of fan noise
• Two tachometer inputs for measuring the RPM of two fans independently
• Active-low FF/FS pin multiplexes fan-failure output with FullSpeed fan-drive input
• Accurately senses remote and local temperature
• Programmable thermal diode ideality factor minimizes ideality factor mismatch
• Automatic series resistance cancellation, dedicated active-low ALERT pin for temperature faults
• 3.0V to 3.6V operating voltage range
• 16-pin QSOP package, -40°C to +125°C temperature range

Notes

ADI products are only authorized (and sold) for use by the customer and are not to be resold or otherwise passed on to any third party