LM94系列介绍资料 - 万联芯城

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LM94

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具有 β 补偿、风扇控制、硬件和电源监控器、采用 TSSOP 封装的 ±2°C 四路远程和本地温度传感器

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The LM94 hardware monitor has a two wire digital interface compatible with SMBus 2.0. Using a ΣΔ ADC, the LM94 measures the temperature of four remote diode connected transistors as well as its own die and 16 power supply voltages. The LM94 has new TruTherm technology that supports precision thermal diode measurements of processors on sub-micron processes.

Description (continued)
To set fan speed, the LM94 has two PWM outputs that are each controlled by up to six temperature zones. The fan-control algorithm can be based on a lookup table, PI (proportional/integral) control loop, or a combination of both. The LM94 includes digital filters that can be invoked to smooth temperature readings for better control of fan speed such that acoustical noise is minimized. The LM94 has four tachometer inputs to measure fan speed. Limit and status registers for all measured values are included.

The LM94 builds upon the functionality of previous motherboard server management ASICs, such as the LM93. It also adds measurement and control support for dynamic Vccp monitoring for VRD10/11 and PROCHOT. It is designed to monitor a dual processor Xeon class motherboard with a minimum of external components.

8-bit ΣΔ ADC
Monitors 16 Power Supplies
Monitors 4 Remote Thermal Diodes and 2 LM60
New TruTherm Technology Support for Precision Thermal Diode Measurements
Internal Ambient Temperature Sensing
Programmable Autonomous Fan Control Based on Temperature Readings with Fan Boost Support
Fan Boost Support on Tachometer Limit Error Event
Fan Control Based on 13-step Lookup Table or PI Control Loop or Combination of Both
PI Fan Control Loop Supports Tcontrol
Temperature Reading Digital Filters
0.5°C digital Temperature Sensor Resolution
0.0625°C Filtered Temperature Resolution for Fan Control
2 PWM Fan Speed Control Outputs
4 Fan Tachometer Inputs
Dual Processor Thermal Throttling (PROCHOT) Monitoring
Dual Dynamic VID Monitoring (6/7 VIDs per processor) Supports VRD10.2/11
8 General Purpose I/Os:
- 4 Can be Configured as Fan tachometer Inputs
- 2 Can be Configured to Connect to Processor THERMTRIP
- 2 are Standard GPIOs that Could be Used to Monitor IERR Signal
2 General Purpose Inputs that Can be Used to Monitor the 7th VID Signal for VRD11
Limit Register Comparisons of all Monitored Values
2-wire Serial Digital Interface, SMBus 2.0 Compliant
- Supports Byte/block Read and Write
- Selectable Slave Address (Tri-level Pin Selects 1 of 3 Possible Addresses)
- ALERT Output Supports Interrupt or Comparator Modes
2.5V Reference Voltage Output
56-pin TSSOP Package
XOR-tree Test Mode

Key Specifications

Voltage Measurement Accuracy ... ±2% FS (max)
Temperature Resolution ... 9-bits, 0.5°C
Temperature Sensor Accuracy ... ±2.5 °C (max)
Temperature Range:
- LM94 Operational ... 0°C to +85°C
- Remote Temp Accuracy ... 0°C to +125°C
Power Supply Voltage ... +3.0V to +3.6V
Power Supply Current ... 1.6 mA

All trademarks are the property of their respective owners.

Local sensor accuracy (max)	3
Type	Fan Controller
Operating temperature range (°C)	0 to 100
Supply voltage (min) (V)	3
Interface type	SMBus
Supply voltage (max) (V)	3.6
Features	PWM output, Tachometer
Supply current (max) (µA)	1600
Temp resolution (max) (Bits)	8
Remote channels (#)	4
Addresses	3
Rating	Catalog

TSSOP (DGG)

113.4 mm² 14 x 8.1

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LM94

具有 β 补偿、风扇控制、硬件和电源监控器、采用 TSSOP 封装的 ±2°C 四路远程和本地温度传感器

Key Specifications

4000-306-326