±1°C, SMBus-Compatible Remote/Local Temperature Sensors with Overtemperature Alarms

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The MAX6657/MAX6658/MAX6659 are precise, two-channel digital temperature sensors. Each accurately measures the temperature of its own die and one remote PN junction, and reports the temperature in digital form on a 2-wire serial interface. The remote junction can be a diode-connected transistor like the low-cost NPN type 2N3904 or 2N3906 PNP type. The remote junction can also be a common-collector PNP, such as a substrate PNP of a microprocessor.

The 2-wire serial interface accepts standard System Management Bus (SMBus™) commands such as Write Byte, Read Byte, Send Byte, and Receive Byte to read the temperature data and program the alarm thresholds and conversion rate. The MAX6657/MAX6658/MAX6659 can function autonomously with a programmable conversion rate, which allows the control of supply current and temperature update rate to match system needs. For conversion rates of 4Hz or less, the temperature is represented in extended mode as 10 bits + sign with a resolution of 0.125°C. When the conversion rate is faster than 4Hz, output data is 7 bits + sign with a resolution of 1°C. The MAX6657/MAX6658/MAX6659 also include an SMBus timeout feature to enhance system reliability.

Remote accuracy is ±1°C between +60°C and +100°C with no calibration needed. The MAX6657 measures temperatures from 0°C to +125°C and the MAX6658/MAX6659 from -55°C to +125°C. The MAX6659 has the added benefit of being able to select one of three addresses through an address pin, and a second over-temperature alarm pin for greater system reliability.
MAX6657, MAX6658, MAX6659: Typical Operating Circuit MAX6657, MAX6658, MAX6659: Typical Operating Circuit Enlarge+

Key Features

  • Dual Channel Measures Remote and Local Temperature
  • 11-Bit, +0.125°C Resolution
  • High Accuracy ±1°C (max) from +60°C to +100°C (Remote)
  • No Calibration Required
  • Programmable Under/Overtemperature Alarms
  • Programmable Conversion Rate (0.0625Hz to 16Hz)
  • SMBus/I²C*-Compatible Interface
  • Two Alarm Outputs: active-low ALERT and active-low OVERT1 (MAX6657 and MAX6658)
  • Three Alarm Outputs: active-low ALERT, active-low OVERT1, and active-low OVERT2 (MAX6659)
  • Compatible with 65nm Process Technology(Y Versions)


  • Computers: Desktop, Workstation, Server
  • Notebook Computers
  • Servers
  • Workstations

See parametric specs for Temperature Sensors (113)

Part NumberSensor TypeAlarm OutputFunctionsInterfaceChannelsAccuracy
Parasite Pwr.Temp. Thresh.Temp. Resolution
Multi DroppableOper. Temp.
See Notes
MAX6657 Remote
Remote & Local Sensor2-Wire/I2C/SMBusOne1NoProgrammable11Yes-55 to +125
SOIC (N)/8
$2.28 @1k
SOIC (N)/8
$2.31 @1k
$2.58 @1k

Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.
Product Reliability Reports: MAX6657.pdf 
Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C   Material Composition  

Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

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