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12-Bit Plus Sign Temperature Sensors with SMBus/I²C-Compatible Serial Interface

Product Details

Key Features

Parametric specs for Temperature Sensors
Sensor Type Local
# Channels One
Interface 2-Wire/I2C/SMBus
Alarm Output Alert
Overt
Accuracy (±°C) 1
Parasite Pwr. No
Temp. Thresh. Programmable
Temp. Resolution (bits) 13
Oper. Temp. (°C) -55 to +150
Package/Pins SOIC (N)/8
Budgetary
Price (See Notes)
1.73
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Simplified Block Diagram

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Parameters

Parametric specs for Temperature Sensors
Sensor Type Local
# Channels One
Interface 2-Wire/I2C/SMBus
Alarm Output Alert
Overt
Accuracy (±°C) 1
Parasite Pwr. No
Temp. Thresh. Programmable
Temp. Resolution (bits) 13
Oper. Temp. (°C) -55 to +150
Package/Pins SOIC (N)/8
Budgetary
Price (See Notes)
1.73

Key Features

  • +3V to +5.5V Supply Range
  • Accuracy
    • ±1°C max (0°C to +50°C)
    • ±1.5°C max (-20°C to +85°C)
    • ±2.5°C max (-40°C to +125°C)
    • ±2.5°C typ (+150°C)
  • User-Programmable Temperature Thresholds (MAX6634/MAX6635)
  • User-Configurable Alarm Output(s) (MAX6634/MAX6635)
  • Ability to Respond to SMBus/I²C-Compatible Alert Response Address (MAX6634/MAX6635)
  • Active-Low OVERT Output for System Shutdown (MAX6635)
  • Multiple Devices per Bus
    • 16 devices (MAX6633)
    • 8 devices (MAX6634)
    • 4 devices (MAX6635)

Applications/Uses

  • Battery-Temperature Alarms
  • PC Temperature Control

Description

The MAX6633/MAX6634/MAX6635 combine a temperature sensor, a programmable overtemperature alarm, and an SMBus™/I²C-compatible serial interface into a single package. They convert their die temperatures into digital values using internal analog-to-digital converters (ADCs). The result of the conversion is then held in a temperature register as a 12-bit + sign value, allowing 0.0625°C resolution, readable at any time through the serial interface. The devices are capable of reading temperatures up to +150°C.

The MAX6633/MAX6634/MAX6635 feature a shutdown mode that saves power by turning off everything except the power-on reset (POR) and the serial interface. The devices can be configured to separate addresses, allowing multiple devices to be used on the same bus.

The MAX6633 has four address pins, allowing up to 16 devices to be connected to a single bus. The MAX6634 has three address pins, allowing up to eight devices to be connected to a single bus. The MAX6635 has two address pins, allowing up to four devices to be connected to a single bus.

The MAX6633/MAX6634/MAX6635 make temperature data available for transfer over the serial interface. The MAX6634 incorporates a dual-mode active-low ALERT output (open drain) and can serve as an upgraded alternative to the LM75. The MAX6635 includes an active-low ALERT output and an active-low OVERT output (both open drain) and can function as an upgraded replacement for the LM76 in most applications. The MAX6634/MAX6635 feature user-programmable temperature thresholds. All three devices come in an 8-pin SO package.

Simplified Block Diagram

MAX6633, MAX6634, MAX6635: Typical Operating Circuit MAX6633, MAX6634, MAX6635: Typical Operating Circuit Zoom icon

Technical Docs

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .