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Maxim > Products > [Temperature Sensors] 
MAX6655, MAX6656
Dual Remote/Local Temperature Sensors and Four-Channel Voltage Monitors


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Status
Active: In Production.

Data Sheet
FULL DATA SHEET (PDF, 240kB)
Download this datasheet in PDF formatDownload   Send this datasheet to any email addressE-Mail

Description
The MAX6655/MAX6656 are precise voltage and temperature monitors. The digital thermometer reports the temperature of two remote sensors and its own die temperature. The remote sensors are diode-connected transistors—typically a low-cost, easily mounted 2N3906 PNP type—that replace conventional thermistors or thermocouples. Remote accuracy is ±1°C for multiple transistor manufacturers with no calibration necessary. The remote channels can also measure the die temperature of other ICs, such as microprocessors, that contain a substrate-connected PNP with its collector grounded and its base and emitter available for temperature-sensing purposes. The temperature is digitized with 11-bit resolution.

The MAX6655/MAX6656 also measure their own supply voltage and three external voltages with 8-bit resolution. Each voltage input's sensitivity is set to give approximately 3/4-scale output code when the input voltage is at its nominal value. The MAX6655 operates at +5V supply and its second voltage monitor is 3.3V. The MAX6656 operates on a +3.3V supply and its second voltage monitor is 5V.

The 2-wire serial interface accepts standard SMBus™ Write Byte, Read Byte, Send Byte, and Receive Byte commands to program the alarm thresholds and to read data. The MAX6655/MAX6656 also provide SMBus alert response and timeout functions. The MAX6655/MAX6656 measure automatically and autonomously, with the conversion rate programmable. The adjustable rate allows the user to control the supply current.

In addition to the SMBus active-low ALERT output, the MAX6655/MAX6656 feature an active-low OVERT output, which is used as a temperature reset that remains active only while the temperature is above the maximum temperature limit. The active-low OVERT output is optimal for fan control or for system shutdown.

An evaluation kit is available:  MAX6655EVKIT, MAX6655EVSYS  

Key Features   Applications/Uses
  • Three Temperature Channels
    • Two Remote PN Junctions
    • One Local Sensor
  • Four Voltage Channels
    • +12V, +5V, +3.3V, +2.5V
    • Three External Monitors
    • One Internal Supply Monitor
  • 11-Bit, 0.125°C Resolution
  • High Accuracy: ±1°C Over +60°C to +100°C Temperature Range
  • Programmable Under/Over-Threshold Alarms
  • Programmable Power-Saving Mode
  • No Calibration Required
  • SMBus/I²C-Compatible Interface
  • Active-low OVERT Output for Fan Control and System Shutdown

 
  		• Communication Systems
  		• Computers: Desktop, Workstation, Server
  		• Notebook Computers
  		• Servers
  		• Thin Clients
  		• Workstations

    Key Specifications:  Temperature Sensors
    Part Number Sensor Type Alarm Output Functions Interface Remote Chan. Accuracy
    (±°C)    		 Parasite Pwr. Temp. Thresh. Temp. Resolution
    (bits)    		 Oper. Temp.
    (°C)    		 Smallest Available Pckg.
    (mm2)    		 Price
    max w/pins See Notes
    MAX6655  Remote
    Alert
    Overt
    Remote & Local Sensor
    Voltage Monitor
    		 2-Wire/I2C/SMBus Dual 1 No Programmable 11 -55 to +125 31 $2.74 @1k
    MAX6656  $2.74 @1k
    See All Temperature Sensors (99)

    Diagram
    MAX6655, MAX6656: Typical Application Circuit
    Typical Application Circuit

    Application Notes
  		• Application Note 941: Circuit Monitors Board, Air, and CPU Temperature to Protect System from Overheating - MAX6655, MAX6656
  		• Application Note 1057: Compensating for Ideality Factor and Series Resistance Differences between Thermal Sense Diodes - MAX6655, MAX6656

    Evaluation Kits
  		• MAX6655EVKIT, MAX6655EVSYS

    Design Guides
  		• Thermal Management (PDF)

    Reliability Reports
  		• Reliability Report: MAX6655.pdf MAX6656.pdf
  		• Show FIT data for:

    Software/Models
    none

    Ordering Information
    Notes:

    1. Other options and links for purchasing parts are listed at: http://www.maxim-ic.com/sales.
    2. Didn't Find What You Need? Ask our applications engineers. Expert assistance in finding parts, usually within one business day.
    3. Part number suffixes: T or T&R = tape and reel;+ = RoHS/lead-free;# = RoHS/lead-exempt. More: SeeFull Data Sheet or Part Naming Conventions.
    4. * Some packages have variations, listed on the drawing. "PkgCode/Variation" tells which variation the product uses. Note that "+", "#", "-" in the part number suffix describes RoHS status. Package drawings may show a different suffix character.


    Devices: 1-10 of 10

    MAX6655 Free
    Sample    		 Buy Status
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    		Temp RoHS/Lead-Free?
    Materials Analysis
    MAX6655MEE    
    		Active QSOP;16 pin;31 mm²
    Outline Drawing: 21-0055 (PDF)
    Land Pattern: 90-0167 (PDF)
    Use pkgcode/variation: E16-5*
    		0°C to +70°C RoHS/Lead-Free: No
    Materials Analysis
    MAX6655MEE-T    
    		Active

    Land Pattern: Not Available

    		0°C to +70°C See data sheet
    MAX6655MEE+  
    		Active QSOP;16 pin;31 mm²
    Outline Drawing: 21-0055 (PDF)
    Land Pattern: 90-0167 (PDF)
    Use pkgcode/variation: E16+5*
    		0°C to +70°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX6655MEE+T    
    		Active

    Land Pattern: Not Available

    		0°C to +70°C See data sheet
    MAX6656 Free
    Sample    		 Buy Status
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    		Temp RoHS/Lead-Free?
    Materials Analysis
    MAX6656MEE-TG05    
    		Active QSOP;16 pin;31 mm²
    Outline Drawing: 21-0055 (PDF)
    Land Pattern: 90-0167 (PDF)
    Use pkgcode/variation: E16-5*
    		0°C to +70°C RoHS/Lead-Free: No
    Materials Analysis
    MAX6656MEE-G05    
    		Active

    Land Pattern: Not Available

    		0°C to +70°C See data sheet
    MAX6656MEE    
    		Active QSOP;16 pin;31 mm²
    Outline Drawing: 21-0055 (PDF)
    Land Pattern: 90-0167 (PDF)
    Use pkgcode/variation: E16-5*
    		0°C to +70°C RoHS/Lead-Free: No
    Materials Analysis
    MAX6656MEE-T    
    		Active QSOP;16 pin;31 mm²
    Outline Drawing: 21-0055 (PDF)
    Land Pattern: 90-0167 (PDF)
    Use pkgcode/variation: E16-5*
    		0°C to +70°C RoHS/Lead-Free: No
    Materials Analysis
    MAX6656MEE+  
    		Active QSOP;16 pin;31 mm²
    Outline Drawing: 21-0055 (PDF)
    Land Pattern: 90-0167 (PDF)
    Use pkgcode/variation: E16+5*
    		0°C to +70°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX6656MEE+T    
    		Active QSOP;16 pin;31 mm²
    Outline Drawing: 21-0055 (PDF)
    Land Pattern: 90-0167 (PDF)
    Use pkgcode/variation: E16+5*
    		0°C to +70°C RoHS/Lead-Free: Lead Free
    Materials Analysis

    More Information
  		• New Product Press Release 2001-09-06 
  		• Temperature Family by Product Type

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    Document Ref.: 19-2117; Rev 1; 2006-06-05
    This page last modified: 2008-03-13


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