MAX6655
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MAX6655

Dual Remote/Local Temperature Sensors and Four-Channel Voltage Monitors

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Part Models 2
1ku List Price Starting From $4.59
Features
  • 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
Additional Details
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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.

Applications

  • Communication Systems
  • Computers: Desktop, Workstation, Server
  • Notebook Computers
  • Servers
  • Thin Clients
  • Workstations
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file View Data Sheet (Rev.3)
Documentation View All Documentation
Part Models 2
1ku List Price Starting From $4.59
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MAX6655

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Data Sheet

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UPDATED 12/13/2021
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MAX6655-MAX6656: Dual Remote/Local Temperature Sensors and Four-Channel Voltage Monitors Data Sheet (Rev.3)

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UPDATED 01/01/1900
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3047: 双路远端/本地温度传感器及四路电压监测器 Data Sheet

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UPDATED 01/01/1900
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3047: デュアルリモート/ローカル温度センサおよび4チャネル電圧モニタ Data Sheet

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Reliability Data

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UPDATED 01/12/2023
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MAX6655 Reliability Data redirect icon

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Design Note

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UPDATED 09/05/2002
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Compensating for Ideality Factor and Series Resistance Differences between Thermal-Sense Diodes redirect icon

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Documentation

ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.

Part Model Pin/Package Drawing Documentation CAD Symbols, Footprints, and 3D Models
MAX6655MEE+ 16-QSOP-150_MIL external-link
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  • Material Declaration external-link
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MAX6655MEE+T 16-QSOP-150_MIL external-link
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  • Material Declaration external-link
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  • Reliablity Data external-link

Evaluation Kits 2

MAX6655EVSYS

Evaluation System/Evaluation Kit for the MAX6655, MAX6656

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MAX6655EVSYS

Evaluation System/Evaluation Kit for the MAX6655, MAX6656

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Download

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Print
MAX6655EVSYS
Evaluation System/Evaluation Kit for the MAX6655, MAX6656

Features and Benefits

  • Measures and Displays Three Temperature Channels
    • Two Remote PN Junctions
    • One Local Sensor
  • Monitors Four Voltage Channels
    • Three External (+2.5V, +3.3V, and +12V Nominal)
    • VCC Pin (+5V Nominal)
  • Programmable Alarms and Configuration
  • Operating Temperature Ranges
    • -55°C to +125°C (Remote Sensors)
    • 0°C to +70°C (Board)
  • SMBus/I²C Compatible
  • Easy-to-Use Menu-Driven Software
  • Assembled and Tested
  • Includes Windows 95/98-Compatible Software and Demo PC Board
Buy Now View Details

Product Detail

The MAX6655 evaluation system (EV system) consists of a MAX6655 evaluation kit (EV kit) and a companion Maxim SMBus™ interface board.

The MAX6655 EV kit is an assembled and tested PC board that demonstrates the MAX6655 dual remote/local temperature sensor and four-channel voltage monitor. It monitors the MAX6655 temperature and supply voltage, the temperature of two external diode-connected transistors, and the voltage of three external supplies. Temperature is converted to 11-bit serial data and voltage to 8-bit data. Two 2N3906 temperature-sensor transistors come soldered to the board in SOT23 packages, but they can be removed. The board can then be connected through a twisted pair to remote diodes closer to your system.

The Maxim SMBus interface board (MAXSMBus) allows an IBM®-compatible PC to use its parallel port to emulate an Intel® System Management Bus (SMBus) 2-wire interface. Windows® 95/98-compatible software provides a user-friendly interface to exercise the features of the MAX6655. The program is menu driven and offers a graphic interface with control buttons and status display.

Order the MAX6655EVSYS for complete IBM PC-based evaluation of the MAX6655. Order the MAX6655EVKIT if you already have an SMBus interface.

To evaluate the MAX6656, order a free sample of the MAX6656MEE.

Applications

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

MAX6655EVKIT

Evaluation System/Evaluation Kit for the MAX6655, MAX6656

zoom

MAX6655EVKIT

Evaluation System/Evaluation Kit for the MAX6655, MAX6656

download icon

Download

 print icon

Print
MAX6655EVKIT
Evaluation System/Evaluation Kit for the MAX6655, MAX6656

Features and Benefits

  • Measures and Displays Three Temperature Channels
    • Two Remote PN Junctions
    • One Local Sensor
  • Monitors Four Voltage Channels
    • Three External (+2.5V, +3.3V, and +12V Nominal)
    • VCC Pin (+5V Nominal)
  • Programmable Alarms and Configuration
  • Operating Temperature Ranges
    • -55°C to +125°C (Remote Sensors)
    • 0°C to +70°C (Board)
  • SMBus/I²C Compatible
  • Easy-to-Use Menu-Driven Software
  • Assembled and Tested
  • Includes Windows 95/98-Compatible Software and Demo PC Board
Buy Now View Details

Product Detail

The MAX6655 evaluation system (EV system) consists of a MAX6655 evaluation kit (EV kit) and a companion Maxim SMBus™ interface board.

The MAX6655 EV kit is an assembled and tested PC board that demonstrates the MAX6655 dual remote/local temperature sensor and four-channel voltage monitor. It monitors the MAX6655 temperature and supply voltage, the temperature of two external diode-connected transistors, and the voltage of three external supplies. Temperature is converted to 11-bit serial data and voltage to 8-bit data. Two 2N3906 temperature-sensor transistors come soldered to the board in SOT23 packages, but they can be removed. The board can then be connected through a twisted pair to remote diodes closer to your system.

The Maxim SMBus interface board (MAXSMBus) allows an IBM®-compatible PC to use its parallel port to emulate an Intel® System Management Bus (SMBus) 2-wire interface. Windows® 95/98-compatible software provides a user-friendly interface to exercise the features of the MAX6655. The program is menu driven and offers a graphic interface with control buttons and status display.

Order the MAX6655EVSYS for complete IBM PC-based evaluation of the MAX6655. Order the MAX6655EVKIT if you already have an SMBus interface.

To evaluate the MAX6656, order a free sample of the MAX6656MEE.

Applications

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

Evaluation Kits2

MAX6655EVSYS

Evaluation System/Evaluation Kit for the MAX6655, MAX6656

MAX6655EVKIT

Evaluation System/Evaluation Kit for the MAX6655, MAX6656

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