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TruTherm? Hardware Monitor with PI Fan Control for Workstation Management from the PowerWise® Family
National Semiconductor
Description
The LM96194 hardware monitor has a two wire digital interface compatible with SMBus 2.0. Using a ΣΔ ADC, the LM96194 measures the temperature of four remote diode connected transistors as well as its own die and 9 power supply voltages. The LM96194 has new TruTherm technology that supports precision thermal diode measurements of processors on sub-micron processes. To set fan speed, the LM96194 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 LM96194 includes digital filters that can be invoked to smooth temperature readings for better control of fan speed such that acoustical noise is minimized. The LM96194 has four tachometer inputs to measure fan speed. Limit and status registers for all measured values are included. The LM96194 includes most of the features of the LM94, dual CPU motherboard server management ASIC, such as measurement and control support for dynamic Vccp monitoring for VRD10/11 and ^PROCHOT but is targeted for single processor systems.
Features
• ΣΔ ADC architecture
• Monitors 9 power supplies
• Monitors 4 remote thermal diodes and 2 LM60
• NewTruTherm 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
• Processor thermal throttling ( ^PROCHOT) monitoring
• 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
• A 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
• LLP-48 package
• XOR-tree test mode
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