GENERAL DESCRIPTION
The NCT7509 is a Nuvoton Hardware Monitor IC, contains 1 remote and 1 on-die temperature sensor and 1 fan controller with SMBusTM interface. The remote sensor is diode-connected transistor, such as 2N3904 or the thermal diode integrated in Computer Processor Units (CPU) and Graphics Processor Units (GPU). The NCT7509 also supports offset adjust register to correct the errors that casued by different thermal diodes.

FEATURES
Fan Speed Monitoring and Control
   • Support 256 steps PWM modes fan speed control
   • Thermal CruiseTM“ and SMART FAN™IV to control the fan speed
   • Enhanced Smart Fan algorithm, SMART FAN™ IV, supports multi-tracking of fan control vs. temperature and registers for each fan control output.
   • Closed-loop fan controller via RPM setting
   • Manual Mode for specific application Temperature Measurement
   • Measure the temperature with high accuracy
   • One local on-die thermal sensor
   • One remote temperature sensor with current mode
Event Notification
   • Supports 2 alert outputs : ALERT# and T_CRIT#
   • Event notification via ALERT# signal for over temperature and fan error
   • ALERT# output supports SMBusTM 2.0 ARA function
   • T_CRIT# point supports Hardware Power-on setting
General
   • I2C® Compatible System Management bus (SMBusTM)
   • 3.3V±5% VDD operation
   • 10-pin MSOP and DFN Green Package (Halogen-free)