LM85

Features: ` 2-wire, SMBus 2.0 compliant, serial digital interface` 8-bit ∆ 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 rea...

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LM85 Picture
SeekIC No. : 004396235 Detail

LM85: Features: ` 2-wire, SMBus 2.0 compliant, serial digital interface` 8-bit ∆ ADC` Monitors VCCP, 2.5V, 3.3 VSBY, 5.0V, and 12V motherboard/processor supplies` Monitors 2 remote thermal diodes` P...

floor Price/Ceiling Price

Part Number:
LM85
Supply Ability:
5000

Price Break

  • Qty
  • 1~5000
  • Unit Price
  • Negotiable
  • Processing time
  • 15 Days
Total Cost: $ 0.00

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Upload time: 2024/3/28

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Product Details

Description



Features:

` 2-wire, SMBus 2.0 compliant, serial digital interface
` 8-bit ∆ 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





Application

·Desktop PC
·Microprocessor based equipment (e.g. Base-stations, Routers, ATMs, Point of Sales)






Specifications

Supply Voltage, V+ .................................................................................−0.5V to 6.0V
Voltage on Any Digital Input or ..............................................................−0.5V to 6.0V
Output Pin
Voltage on 12V Analog Input ..................................................................−0.5V to 16V
Voltage on 5V Analog Input .................................................................−0.5V to 6.66V
Voltage on Remote1+, Remote2+, ............................................−0.5V to (V+ + 0.05V)
Current on Remote1−, Remote2− ....................................................................±1 mA
Voltage on Other Analog Inputs ............................................................−0.5V to 6.0V
Input Current on Any Pin (Note 3) ....................................................................±5 mA
Package Input Current (Note 3) .....................................................................±20 mA
Package Dissipation at TA = 25°C ..........................................................See (Note 5)
ESD Susceptibility (Note 4)
Human Body Model ...........................................................................................2500V
Machine Model ....................................................................................................250V
Soldering Temperature, Infrared, ....................................................................235°C
10 seconds (Note 6)
Storage Temperature ...................................................................−65°C to +150°C


Temp Resolution 8-bit/1degC
Remote Diode Thermal Sensors 2
TruTherm(TM) Beta Compensation No
Analog Inputs 4, V+
ADC Resolution 8 bits
Fan Speed Inputs 4
Fan Control Output(s) 3 PWM
Fan Control Method Linear
VID Inputs 5
Temperature Accuracy (+/-) 2.5 deg C
Temperature Min 0 deg C
Temperature Max 125 deg C
Interface Type SMBus
Supply Min 3.0 Volt
Supply Max 3.6 Volt
Quiescent Current 0.53 mA
Resolution 8 bits
Temperature Accuracy (+/-) 1 deg C
View Using Catalog





Description

The LM85, hardware monitor, has a two wire digital interface compatible with SMBus 2.0. Using an 8-bit [Sigma][Delta] 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.

Design Tools


Title Size in Kbytes Date
SensorEval Software for Thermal Mangement Products 6 Kbytes 15-May-2008 View

If you have trouble printing or viewing PDF file(s), see Printing Problems.

Application Notes


Title Size in Kbytes Date
AN-1260: Application Note 1260 Autonomous Fan Control for Processor Systems Using the LM85 74 Kbytes 10-Mar-04 Download

If you have trouble printing or viewing PDF file(s), see Printing Problems.

More Application Notes


Title Size in Kbytes Date
AN-1155: Application Note 1155 A Simple Software I2C Routine for the COP8 82 Kbytes 15-May-04 Download
AN-1262: Application Note 1262 Four-Speed Fan Control Using Simple Remote Diode Temperature Sensor 70 Kbytes 1-Oct-02 Download

If you have trouble printing or viewing PDF file(s), see Printing Problems.






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