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EMC2300 Datasheet(PDF) 8 Page - SMSC Corporation

Part No. EMC2300
Description  Fan Control Device with High Frequency PWM and Temperature Monitors
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Maker  SMSC [SMSC Corporation]
Homepage  http://www.smsc.com

EMC2300 Datasheet(HTML) 8 Page - SMSC Corporation

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Fan Control Device with High Frequency PWM and Temperature Monitors
Revision 0.2 (06-14-06)
Chapter 1 General Description
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.
Pulse Width Modulators (PWM) control the speed of the fans by varying the output duty cycle of the
PWM. Each PWM can be associated with any or all of the thermal zones monitored. As the
temperature of the associated zone varies, the PWM duty cycle is adjusted accordingly. The Ramp
Rate Control feature controls the rate of change of the PWM output, thereby reducing system noise
created by changing the fan speed. The speed of each fan is monitored by a Fan Tachometer input.
The measured values are compared to values stored in Limit Registers to detect if a fan has stalled
or seized.
Fan speed may be under host software control or automatic. In host control mode, the host software
continuously monitors temperature and fan speed registers, makes decisions as to desired fan speed
and sets the PWM’s to drive the required fan speed. This device offers an interrupt output signal
(INT#), which may be used to interrupt the host on out-of-limit temperature or voltage condition
enabling an ACPI response as opposed to the host software continuously monitoring status. In auto
“zone” mode, the logic continuously monitors the temperature and fan speeds and adjusts speeds
without intervention from the host CPU. Fan speed is adjusted according to an algorithm using the
temperature measured in the selected zone, the high and low limits set by the user, and the current
fan speed.
The EMC2300 supports two Monitoring modes: Continuous Mode and Cycle Mode. In the continuous
monitoring mode, the sampling and conversion process is performed continuously for each voltage and
temperature reading after monitoring is enabled. The time for each voltage and temperature reading
varies depending on the measurement option. In cycle monitoring mode, the part completes all
sampling and conversions, then waits approximately one second to repeat the process. It repeats the
sampling and conversion process typically every 1.2 seconds (1.4 sec max - default averaging
enabled). The sampling and conversion of each voltage and temperature reading is performed once
every monitoring cycle. (This is a power saving mode.)
The EMC2300 can be placed in one of two low-power modes: Sleep mode or Shutdown mode. These
modes do not reset any of the registers of the device. In Sleep mode bias currents are on and the
internal oscillator is on, but the A/D converter and monitoring cycle are turned off. Serial bus
communication is still possible with any register in the Hardware Monitor Block while in this low-power
mode. In Shutdown mode the bias currents are off, the internal oscillator is off, and the A/D converter
and monitoring cycle are turned off. Serial communication is only possible with a select register.

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