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LM85 Datasheet

  • LM85

  • Hardware Monitor with Integrated Fan Control

  • 26頁

  • NSC

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LM85 Hardware Monitor with Integrated Fan Control
March 2003
LM85
Hardware Monitor with Integrated Fan Control
General Description
The LM85, hardware monitor, has a two wire digital interface
compatible with SMBus 2.0. Using an 8-bit
危鈭?/div>
ADC, the
LM85 measures:
鈥?the temperature of two remote diode connected transis-
tors as well as its own die
鈥?the V
CCP
, 2.5V, 3.3VSBY, 5.0V, and 12V supplies (inter-
nal 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 in-
cluded.
n
n
n
n
n
n
n
Noise filtering of temperature reading for fan control
1.0藲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
Key Specifications
Voltage Measurement Accuracy
Resolution
Temperature Sensor Accuracy
Temperature Range
鈥?LM85 Operational
鈥?Remote Temp Accuracy
n
Power Supply Voltage
n
Power Supply Current
n
n
n
n
鹵
2% FS (max)
8-bits, 1藲C
鹵
3藲C (max)
0藲C to +85藲C
0藲C to +125藲C
+3.0V to +3.6V
0.53 mA
Features
n
2-wire, SMBus 2.0 compliant, serial digital interface
n
8-bit
危鈭?/div>
ADC
n
Monitors V
CCP
, 2.5V, 3.3 VSBY, 5.0V, and 12V
motherboard/processor supplies
n
Monitors 2 remote thermal diodes
n
Programmable autonomous fan control based on
temperature readings
Applications
n
Desktop PC
n
Microprocessor based equipment
(e.g. Base-stations, Routers, ATMs, Point of Sales)
Block Diagram
20035301
漏 2003 National Semiconductor Corporation
DS200353
www.national.com

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