- 8-bit ΣΔADC
- Monitor 16 power supplies
- Monitor 4 remote thermal diodes and 2 LM60
- New TruTherm precision thermal diode measurement technology
- Internal ambient temperature sensing
- Based on programmable autonomous fan control that allows fans to increase temperature readings
- Fan speed limit stimulus support for error events
- 13-step lookup table or PI control loop or a combination of both based fan control
- PI fan control loop supports Tcontrol
- Digital filter for temperature readings
- Resolution of a digital temperature sensor of 0.5°C
- 0.0625°C filter fan control, temperature resolution
- 2 PWM fan speed control outputs
- 4 fan tachometer inputs
- Dual processor thermal choke (^PROCHOT) monitoring
- Dual dynamic VID monitoring (6/7, VID per processor) supports VRD10.2/11
- 8 general-purpose I/O:
- 4. Fan tachometer input can be configured
- 2. CAN BE CONFIGURED TO CONNECT TO THE PROCESSOR^THERMTRIP
- 2 Standard GPIOs can be used to monitor ^ IERR signals
- 2 Universal input, can be used to monitor the 7th VID signal of the VRD11
- Limit all monitored value comparisons registered
- 2-wire serial digital interface, SMBus compatible
- Supports byte/block reads and writes
- Selectable slave address (three-level pin selects 1 for 3 possible addresses)
- ^ The ALERT output supports interrupt or compare mode
- 2.5V reference voltage output
- 56-pin TSSOP package
- XOR tree test mode
illustrate
The LM94 hardware monitoring two-wire digital interface is compatible with SMBus 2.0. Using the ΣΔ ADC, the LM94 measures the temperature of the four remote diodes connected to the transistor as well as its own die and 16 supply voltages. The LM94 has the new TruTherm technology, a processor that supports thermal diode measurement accuracy in submicron processes.
To set the fan speed, the LM94 has two PWM outputs, each controlling 6 temperature zones. The fan control algorithm can be based on a lookup table, PI (proportional/integer) control loop, or a combination of both. The LM94 includes a digital filter that can be called for smooth progress to better control fan speed and other acoustic noise minimum temperature readings. The LM94 has 4 tachometer inputs to measure fan speed. Limit and status registers for all measured values are also included.
After the LM94 was built, the previous motherboard server managed the ASIC functions such as the LM93. It also adds support for dynamic VCCP monitoring, measurement, and control VRD10/11^PROCHOT. It is designed as a dual-processor Xeon-class motherboard display with minimal external components.
Main specifications
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Voltage measurement accuracy
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± 2%FS (max.)
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Temperature resolution
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9 bits, 0.5 °C
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Temperature sensor accuracy
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± 2.5 °C (max.)
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Temperature range:
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LM94 business
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0°C to +85°C
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Remote temperature accuracy
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0 °C to +125 °C
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Supply voltage
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is +3.0 V to +3.6 V
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Supply current
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1.6 mA
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apply
- server
- workstation
- Multiprocessor-based devices
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