General Description
The EMC1422 is a high accuracy, low cost, System Management Bus (SMBus) temperature sensor. Advanced features such as Resistance Error Correction (REC), Beta Compensation (to support CPU diodes requiring the BJT/transistor model including 45nm, 65nm and 90nm processors) and automatic diode type detection combine to provide a robust solution for complex environmental monitoring applications.
Additionally, the EMC1422 provides a hardware programmable system shutdown feature that is programmed at part power-up via two pull-up resistor values and that cannot be masked or corrupted through the SMBus.
Each device provides ±1° accuracy for external diode temperatures and ±2°C accuracy for the internal diode temperature. The EMC1422 monitors two temperature channels (one external and one internal).
Resistance Error Correction automatically eliminates the temperature error caused by series resistance allowing greater flexibility in routing thermal diodes. Beta Compensation eliminates temperature errors caused by low, variable beta transistors common in today's fine geometry processors. The automatic beta detection feature monitors the external diode/transistor and determines the optimum sensor settings for accurate temperature measurements regardless of processor technology. This frees the user from providing unique sensor configurations for each temperature monitoring application. These advanced features plus ±1°C measurement accuracy provide a low-cost, highly flexible and accurate solution for critical temperature monitoring applications.

*Hardware Thermal Shutdown
-triggers dedicated SYS_SHDN pin
-hardware configured range 77°C to 112°C in 1°C steps
-cannot be disabled or modified by software
*Support for diodes requiring the BJT/transistor model
*Designed to support 45nm processors
*Support for 90nm and 65nm CPU diodes
*Pin compatible with ADM1032, MAX6649, and LM99
*Automatically determines external diode type and optimal settings
*Resistance Error Correction
*External Temperature Monitors
-±1°C Accuracy (60°C < TDIODE < 100°C)
-0.125°C Resolution
-Supports up to 2.2nF diode filter capacitor
*Internal Temperature Monitor
-±2°C accuracy
*3.3V Supply Voltage
*Programmable temperature limits for ALERT
*Small 8-pin MSOP Lead-free RoHS Compliant Package

*Notebook Computers
*Desktop Computers
*Embedded applications


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General Description
The EMC1133 is a one-wire sensor that is capable of monitoring up to three voltages and three temperature zones for an Intel PC platform containing an SST host.
The three temperature zones consist of an internal temperature diode and two externally connected temperature diodes. In cooperation with a host device, thermal management and fan control can be performed.
Communication takes place over a one-wire SST based interface. The internal 11-bit delta-sigma ADC architecture provides superb linearity, high accuracy, and excellent noise immunity.

*Single Wire Interface (SST based)
 SST 1.0 compliant
 Fixed Address, Discoverable Device
 Three programmable addresses
 Supports FCS Abort functionality not available in SST 0.9 compliant devices
*Resistance Error Correction
*Ideality Configuration
*Beta Compensation
*Two External Temperature Monitors
 0.125°C resolution
 ±1°C Accuracy (50°C to 70°C)
 Diode Fault Reporting
 Second External Diode configured to read a discrete diode.
*Internal Temperature Monitor
 Range -40°C to +125°C
 0.125°C resolution
±2°C Accuracy (40°C to 70°C)
*Voltage Monitor:
3.3V, 2.5V, VCCP inputs
2% Total Unadjusted Error
11-bit resolution
3.0V to 3.6V

*Desktop PCs, Servers and Workstations


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Product Description
The aSC7611 has a two wire digital interface compatible with SMBus 2.0. Using a 10-bit ΣΔ- ADC, the aSC7611 measures the temperature of two remote diode connected transistors as well as its own die.
Using temperature information from these three zones, an automatic fan speed control algorithm is employed to minimize acoustic impact while achieving recommended CPU temperature under varying operational loads.
To set fan speed, the aSC7611 has three independent pulse width modulation (PWM) outputs that are controlled by one, or a combination of three, temperature zones.
Both high- and low-frequency PWM ranges are supported.
The aSC7611 also includes a digital filter that can be invoked to smooth temperature readings for better control of fan speed and minimum acoustic impact. The aSC7611 has tachometer inputs to measure fan speed on up to four fans. Limit and status registers for all measured values are included to alert the system host that any measurements are outside of programmed limits via status registers.
System voltages of VCCP, 2.5V, 3.3V, 5.0V, and 12V motherboard power are monitored efficiently with internal scaling resistors.

• 2-wire, SMBus 2.0 compliant, serial interface
• 10-bit ΣΔ-ADC
• Monitors internal and remote thermal diodes
• Monitors VCCP, 2.5V, 3.3V, 5.0V, and 12V motherboard/processor supplies
• Programmable autonomous fan control based on temperature readings
• Noise filtering of temperature reading for fan control
• 0.25°C digital temperature sensor resolution
• 3 PWM fan speed control outputs for 2-, 3- or 4- wire fans.
• Provides high and low PWM frequency ranges
• 4 fan tachometer inputs
• Monitors 5 VID control lines
• 24-Lead QSOP package

Measurement System
• 0.25°C resolution, ±2°C accuracy on remote diode
• 0.25°C resolution, ±3°C accuracy on local sensor
• Temperature measurement range on remote sensor –55°C to +125°C using 2’s complement coding.

• 10-bit Resolution, ±2% of Full Scale Fan Tachometer:
• 16-bit count of 90kHz clock periods Limit alarms for all measured values

• Desktop Computers – Motherboards and GraphicsCards
• Laptop Computers
• Microprocessor based equipment (e.g. Basestations, Routers, ATMs, Point of Sales)


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* 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)
— Individual status and enable bits per tach input
— Programmable automatic fan control based on temperature
— Fan ramp rate control for acoustic noise reduction
* Temperature Monitor
— Monitoring of Two Remote Thermal Diodes (+/- 3 deg C accuracy)
— Internal Ambient Temperature Measurement
— Limit Comparison of all Monitored Values
— Individual status and enable bits per thermal input
— Interrupt Pin for out-of-limit Temperature Indication
— Configurable offset for internal or external temperature channels.
— Supports 4 programmable temperature averaging modes
— 2 monitoring modes: Continuous or Cycle (Power Saving mode)
— Offers 2 Low Power Modes when monitoring is off: Sleep and Shutdown Voltage Monitor
— Monitor Power supplies (+2.5V, +5V, +12V, Vccp, and VCC)
— Individual status and enable bits per voltage input
— Limit Comparison of all Monitored Values
— Interrupt Pin for out-of-limit Voltage Indication
— Supports 4 programmable voltage averaging modes
— 2 monitoring modes: Continuous or Cycle (Power Saving mode)
— Offers 2 Low Power Modes when monitoring is off: Sleep and Shutdown
* 5 VID (Voltage Identification) inputs
* XOR Tree test mode
* Mechanical Package (24-pin SSOP; green, lead-free)

General Description
The EMC6D102 is an environmental monitoring device with automatic fan control capability. This ACPI compliant device provides hardware monitoring for up to five 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.
 The EMC6D102 hardware monitor provides analog inputs for monitoring external voltages of +2.5V, +5V, +12V and 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). In addition to monitoring the processor voltage, VID inputs are available to identify the voltage specification. External components are not required for voltage scaling or similar treatment.

 The EMC6D102 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, they are 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.


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