The EMC2300 is an environmental monitoring device with automatic fan control capability. This ACPI compliant device provides hardware monitoring for up to two voltages and three thermal zones, measures the speed of up to four fans, and controls the speed of multiple DC fans using Pulse Width Modulator (PWM) outputs. High frequency and low frequency PWMs are supported.

The EMC2300 hardware monitor provides analog inputs for monitoring the processor voltage Vccp. This device has the capability to monitor its own internal VCC power supply, which may be connected to either main power (VCC) or the suspend power well (VTR).

The EMC2300 hardware monitor includes support for monitoring three thermal zones: two external and one internal. The external temperatures are measured via thermal diode inputs capable of monitoring remote devices. In addition, the EMC2300 is equipped with an ambient temperature sensor for measuring the internal temperature.

Features

  3.3 Volt Operation (5 Volt Tolerant Input Buffers)

  SMBus 2.0 Compliant Interface (Fixed, Not Discoverable) with Three Slave Address Options

  Fan Control

  PWM (Pulse Width Modulation) Outputs (3)

  Fan Tachometer Inputs (4)

  Programmable automatic fan control based on temperature

  Backwards compatible with fans requiring lower frequency PWM drive

  High frequency fan support for 4 wire fans

  One fan can be controlled from as many as 3 temperature zones

  Fan ramp rate control for acoustic noise reduction

  Power Savings Modes

  Two monitoring modes: continuous or cycling (for power savings)

  Two low power modes when monitoring if off: Sleep and Shutdown

  Temperature Monitor

  Monitoring of Two Remote Thermal Diodes (+/- 3 Degrees C Accuracy)

  Internal Ambient Temperature Measurement

  Limit Comparison of All Monitored Values

  Interrupt Pin for out-of-limit Temperature Indication

  Voltage Monitor

  Monitors VCC and VCCP

  Limit Comparison of all Monitored Values

  Interrupt Pin for out-of-limit Voltage Indication

  XNOR Tree Test Mode

  16-Pin SSOP RoHS Compliant Package