EMC6W201-AEZG-TR

EMC6W201-AEZG-TR PRODUCT FEATURES

Data Brief
• 3.3 Volt Operation (5 Volt Tolerant Input Buffers)
• SMBus 2.0 Compliant Interface (Fixed, NotDiscoverable) With Three Slave Address Options— SMBus address change pin— SMBus address enable pin
• Auto-Fan Control with ProcHot Features— PWM (Pulse width Modulation) Outputs (3)— Low Frequency and High Frequency PWM Options(15kHz up to 30kHz)— Fan Tachometer or Lock Rotor Inputs (4)— Programmable automatic fan control based ontemperature— Acoustic enhancement mode— ProcHot pins modulate Tmin— Fan RPM is a function of up to three temperatures andProcHot signals
• Voltage Monitor— Monitor Power supplies (+1.5V, +2.5V, +5V, VCC andtwo 1.5V VCCP)— Limit Comparison of all Monitored Values— Interrupt Pin for out-of-limit Voltage Indication
• ProcHot Input/Bi-directional Pins (2)— Selectable pins dedicated as input or input/output— Seperate ProcHot Output pin (FORCED_PR#)
• Power Good Output
• SMBus Alert Interrupt Output
• Register Characteristics— Individual enables/disables for each input— Two ISRs for each alert
• XOR Tree Test Mode
• Mechanical Package: 36-pin QFN, lead-free RoHS— Piecewise linear fan control algorithm optionCompliant
• Temperature Monitor— Monitoring of up to Five Remote Thermal Diodes (+/- 3deg C accuracy)— Internal Ambient Temperature Measurement— Limit Comparison of all Monitored Values— Interrupt Pin for out-of-limit Temperature Indication— Configurable offset for internal or external temperaturechannels.EMC6W201-AEZG FOR 36-PIN QFN LEAD-FREE ROHS COMPLIANT PACKAGEORDER NUMBER:SMSC EMC6W201

EMC6W201-AEZG-TR General Description

The EMC6W201 is an environmental monitoring device with automatic fan control capability andenhanced system acoustics for noise suppression. This ACPI compliant device provides hardwaremonitoring for up to six voltages (including its own VCC) and five external thermal sensors, measuresthe speed of up to five fans, and controls the speed of multiple DC fans using three Pulse WidthModulator (PWM) outputs. Note that it is possible to control more than three fans by connecting twofans to one PWM output. The EMC6W201 will be available in a 36-pin QFN, lead-free RoHS Compliantpackage.The EMC6W201 includes support for monitoring six thermal sensors: five external and one internal.The external temperatures are measured via thermal diode inputs capable of monitoring remotedevices. In addition, it is equipped with an ambient temperature sensor for measuring the internaltemperature.The EMC6W201 hardware monitor provides analog inputs for monitoring external voltages of +1.5V,+2.5V, +5V, and two Vccp voltages. This device has the capability to monitor its own internal VCCpower supply, which may be connected to either main power (VCC) or the suspend power well (VTR).External components are not required for voltage scaling or similar treatment.Pulse Width Modulators (PWM) will control the speed of the fans by varying the output duty cycle ofthe PWM. The Ramp Rate Control feature controls the rate of change of the PWM output, therebyreducing system noise created by changing the fan speed. The speed of each fan is monitored by aFan Tachometer input. The measured values are compared to values stored in Limit Registers todetect if a fan has stalled or seized.Fan speed may be under host software control or automatic. In host control mode, the host softwarecontinuously monitors temperature and fan speed registers, makes decisions as to desired fan speedand sets each PWM to drive the required fan speed. The PWM frequency is adjustable up to 30kHz.The EMC6W201 device offers an interrupt output signal (INT#), which may be used to interrupt thehost on out-of-limit temperature or voltage condition enabling an ACPI response as opposed to thehost software continuously monitoring status.In auto “zone” mode, the EMC6W201 logic continuously monitors the temperature and fan speeds andadjusts speeds without intervention from the host CPU. Fan speed is adjusted according to analgorithm using the temperature measured in the selected zone, the high and low limits set by the user,and the current fan speed. The part can automatically adjust its operation based on its environmentfor improved acoustic behavior.OverviewThe EMC6W201 device is an intelligent fan control system with reduced overall acoustic noisefeatures. The EMC6W201 monitors voltages, external temperatures, and fan speeds. It uses thismonitoring capability to alert the system to out of limit conditions and can automatically control thespeeds of multiple fans.SMSC EMC6W2013PRODUCT PREVIEWRevision 0.3 (03-01-07)