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Features
2-wire, SMBus 2.0 compliant, serial digital interface
8-bit ΣΔ ADC
Monitors VCCP, 2.5V, 3.3 VSBY, 5.0V, and 12V motherboard/processor supplies
Monitors 2 remote thermal diodes
Programmable autonomous fan control based on temperature readings
Noise filtering of temperature reading for fan control
1.0°C digital temperature sensor resolution
3 PWM fan speed control outputs
4 fan tachometer inputs
Monitors 5 VID control lines
24-pin QSOP package
XOR-tree test mode
Description The LM85, hardware monitor, has a two wire digital interface compatible with SMBus 2.0. Using an 8-bit ΣΔ ADC, the LM85 measures:
– the temperature of two remote diode connected transistors as well as its own die
– the VCCP, 2.5V, 3.3VSBY, 5.0V, and 12V supplies (internal scaling resistors).
To set fan speed, the LM85 has three PWM outputs that are each controlled by one of three temperature zones. The LM85 includes
a digital filter that can be invoked to smooth temperature readings for better control of fan speed. The LM85 has four tachometer
inputs to measure fan speed. Limit and status registers for all measured values are included.
Key Specification
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Voltage Measurement Accuracy
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±2% FS (max)
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Resolution
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8-bits, 1°C
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Temperature Sensor Accuracy
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±3°C (max)
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Temperature Range
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LM85 Operational
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0°C to +85°C
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Remote Temp Accuracy
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0°C to +125°C
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Power Supply Voltage
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+3.0V to +3.6V
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Power Supply Current
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0.53 mA
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Applications
Desktop PC
Microprocessor based equipment
(e.g. Base-stations, Routers, ATMs, Point of Sales)
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Also Recommended
| LM96194▲ | PI Fan Control With TruTherm(TM) Technology |
| LM96000▲ | Functional Equivalent That Supports 22.5kHz PWM Fan Drive |
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