MAX6628:Remote ±1°C Accurate Digital Temperature Sensors with SPI-Compatible Serial Interface

First Remote SPI-Compatible Temperature Sensors in SOT Packages ±1°C Accurate with 12-Bit +0.0625°C Resolution

The MAX6627/MAX6628 precise digital temperature sensors report the temperature of a remote sensor. The remote sensor is a diode-connected transistor, typically a low-cost, easily mounted 2N3904 NPN type that replaces conventional thermistors or thermocouples. The MAX6627/MAX6628 can also measure the die temperature of other ICs, such as microprocessors (µPs) or microcontrollers (µCs) that contain an on-chip, diode-connected transistor. Remote accuracy is ±1°C when the temperature of the remote diode is between 0°C and +125°C and the temperature of the MAX6627/MAX6628 is +30°C. The temperature is converted to a 12-bit + sign word with 0.0625°C resolution. The architecture of the device is capable of interpreting data as high as +145°C from the remote sensor. The MAX6627/MAX6628 temperature should never exceed +125°C. These sensors are 3-wire serial interface SPI™ compatible, allowing the MAX6627/MAX6628 to be readily connected to a variety of µCs. The MAX6627/MAX6628 are read-only devices, simplifying their use in systems where only temperature data is required. Two conversion rates are available, one that continuously converts data every 0.5s (MAX6627), and one that converts data every 8s (MAX6628). The slower version provides minimal power consumption under all operating conditions (30µA, typ). Either device can be read at any time and provide the data from the last conversion. Both devices operate with supply voltages between +3.0V and +5.5V, are specified between -55°C and +125°C, and come in space-saving 8-pin SOT23 and lead-free TDFN packages.

Key Features
  • Accuracy
    • ±1°C (max) from 0°C ≤ TRJ ≤ +125°C, TA = +30°C
    • ±2.4°C (max) from -55°C ≤ TRJ ≤ +100°C,
    • 0°C ≤ TA ≤ +70°C
  • 12-Bit + Sign, 0.0625°C Resolution
  • Low Power Consumption
    • 30µA (typ) (MAX6628)
    • 200µA (typ) (MAX6627)
  • Operating Temperature Range (-55°C to +125°C)
  • Measurement Temperature Range, Remote Junction (-55°C to +145°C)
  • 0.5s (MAX6627) or 8s (MAX6628) Conversion Rate
  • SPI-Compatible Interface
  • +3.0V to +5.5V Supply Range
  • 8-Pin SOT23 and TDFN Packages
  • Lead-Free Version Available (TDFN Package)
MAX6627, MAX6628: Functional Diagram
MAX6627, MAX6628: Functional Diagram
Applications/Uses
  • Hard Disk Drive
  • Industrial Control Systems
  • Notebooks, PCs
  • Smart Battery Packs/Chargers
DataSheet
titleDownload file
MAX6627-MAX6628 Data SheetMAX6627-MAX6628.pdf
Parametrics
Part NumberSensor TypeInterfaceChannelsAccuracy
(±°C)
Parasite Pwr.Temp. Resolution
(bits)
Oper. Temp.
(°C)
Package/PinsBudgetary
Price
See Notes
MAX6627Remote3-Wire/SPIOne1No13-55 to +125SOT/8
TDFN-EP/8
$2.62 @1k
MAX6628SOT/8
TDFN-EP/8
Quality and Environmental Data
Related Products
  • MAX6630:12-Bit + Sign Digital Temperature Sensors with Serial Interface
  • MAX6631:12-Bit + Sign Digital Temperature Sensors with Serial Interface
  • MAX6629:12-Bit + Sign Digital Temperature Sensors with Serial Interface
  • MAX6632:12-Bit + Sign Digital Temperature Sensors with Serial Interface
Ordering Information
Part NumberStatusRecommended ReplacementPackageTempRoHS
MAX6628MKANo Longer AvailableMAX6628MKA+SOT,;8 pin;9 mm²-55°C to +125°CNo
MAX6628MKA+ActiveSOT,;8 pin;9 mm²-55°C to +125°CLead Free
MAX6628MKA+TActiveSOT,;8 pin;9 mm²-55°C to +125°CLead Free
MAX6628MKA-TNo Longer AvailableMAX6628MKA+TSOT,;8 pin;9 mm²-55°C to +125°CNo
MAX6628MTA+ActiveTDFN-EP,;8 pin;9.6 mm²-55°C to +125°CLead Free
MAX6628MTA+TActiveTDFN-EP,;8 pin;9.6 mm²-55°C to +125°CLead Free
MAX6627-MAX6628.pdf MAX6628
MAX6628.pdf MAX6628