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Digital Temperature Sensors and Thermal Watchdog with Bus Lockup Protection

Digital Temperature Sensors and Thermal Watchdog with Bus-Lockup Protection and Manual Reset

Product Details

The MAX7500–MAX7504 temperature sensors accurately measure temperature and provide an overtemperature alarm/interrupt/shutdown output. These devices convert the temperature measurements to digital form using a high-resolution, sigma-delta, analog-to-digital converter (ADC). Communication is through an I²C-compatible 2-wire serial interface. The MAX7500/MAX7501/MAX7502 integrate a timeout feature that offers protection against I²C bus lockups. The MAX7503/MAX7504 do not include the timeout feature.

The 2-wire serial interface accepts standard write byte, read byte, send byte, and receive byte commands to read the temperature data and configure the behavior of the open-drain overtemperature shutdown output.

The MAX7500 features three address select lines, while the MAX7501–MAX7504 feature two address select lines and an active-low RESET input. The MAX7500/MAX7501/MAX7502s' 3.0V to 5.5V supply voltage range, low 250µA supply current, and a lockup-protected I²C-compatible interface make them ideal for a wide range of applications, including personal computers (PCs), electronic test equipment, and office electronics.

The MAX7500–MAX7504 are available in 8-pin µMAX® and SO packages and operate over the -55°C to +125°C temperature range.

Key Features

  • Timeout Prevents Bus Lockup (MAX7500, MAX7501, MAX7502)
  • Hardware Reset for Added Protection
  • I²C Bus Interface
  • 3.0V to 5.5V Supply Voltage Range
  • 250µA (typ) Operating Supply Current
  • 3µA (typ) Shutdown Supply Current
  • ±1.5°C (max) Temperature Accuracy (-25°C to +100°C, 3-σ)
  • µMAX, SO Packages Save Space
  • Separate Open-Drain OS Output Operates as Interrupt or Comparator/Thermostat Input
  • Register Readback Capability
  • Improved LM75 Second Source

Applications/Uses

  • Electronic Test Equipment
  • Industrial Process Control
  • Office Electronics
  • PCs
  • Servers
Parametric specs for Temperature Sensors
Sensor Type Local
# Channels One
Interface 2-Wire/I2C/SMBus
Alarm Output -
Functions -
Accuracy (±°C) 2
Parasite Pwr. No
Temp. Thresh. Programmable
Temp. Resolution (bits) -
Oper. Temp. (°C) -55 to +125
Package/Pins SOIC (N)/8
UMAX/8
Budgetary
Price (See Notes)
$0.94 @1k
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Simplified Block Diagram

MAX7500, MAX7501, MAX7502, MAX7503, MAX7504: Typical Application Circuit MAX7500, MAX7501, MAX7502, MAX7503, MAX7504: Typical Application Circuit Zoom icon

Design & Development

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Description

The MAX7500 evaluation kit (EV kit) is a fully assembled and tested surface-mount PCB that evaluates the MAX7500 digital temperature sensor. The MAX7500 accurately measures temperature and provides an overtemperature alarm/interrupt/shutdown output.

The EV kit is self-powered from the on-board USB interface and selects between the eight available I²C slave addresses of the MAX7500 IC. The MAX7500 EV kit can also evaluate the MAX7501–MAX7504 ICs. Request free IC samples from the factory when ordering the MAX7500 EV kit.

The MAX7500 EV kit provides an on-board I²C/SMBus™ interface and is connected to the computer through the universal serial bus (USB) port. The EV kit includes Windows® 2000/XP and Windows Vista®-compatible software that provides a graphical user interface (GUI) for control of the MAX7500's programmable features.

View Details

Features

  • Self-Powered from USB source
  • Optional 3V to 5.5V Single Power Supply
  • Digital Temperature Sensor
  • Also Evaluates MAX7501–MAX7504
  • On-Board I²C/SMBus Interface Control Through USB
  • Eight Available I²C Slave Addresses
  • Windows 2000/XP and Windows Vista (32-Bit)-Compatible Software
  • Lead(Pb)-Free and RoHS Compliant
  • Fully Assembled and Tested

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SIMULATION MODELS

MAX7500 IBIS Model

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Parameters

Parametric specs for Temperature Sensors
Sensor Type Local
# Channels One
Interface 2-Wire/I2C/SMBus
Alarm Output -
Functions -
Accuracy (±°C) 2
Parasite Pwr. No
Temp. Thresh. Programmable
Temp. Resolution (bits) -
Oper. Temp. (°C) -55 to +125
Package/Pins SOIC (N)/8
UMAX/8
Budgetary
Price (See Notes)
$0.94 @1k

Key Features

  • Timeout Prevents Bus Lockup (MAX7500, MAX7501, MAX7502)
  • Hardware Reset for Added Protection
  • I²C Bus Interface
  • 3.0V to 5.5V Supply Voltage Range
  • 250µA (typ) Operating Supply Current
  • 3µA (typ) Shutdown Supply Current
  • ±1.5°C (max) Temperature Accuracy (-25°C to +100°C, 3-σ)
  • µMAX, SO Packages Save Space
  • Separate Open-Drain OS Output Operates as Interrupt or Comparator/Thermostat Input
  • Register Readback Capability
  • Improved LM75 Second Source

Applications/Uses

  • Electronic Test Equipment
  • Industrial Process Control
  • Office Electronics
  • PCs
  • Servers

Description

The MAX7500–MAX7504 temperature sensors accurately measure temperature and provide an overtemperature alarm/interrupt/shutdown output. These devices convert the temperature measurements to digital form using a high-resolution, sigma-delta, analog-to-digital converter (ADC). Communication is through an I²C-compatible 2-wire serial interface. The MAX7500/MAX7501/MAX7502 integrate a timeout feature that offers protection against I²C bus lockups. The MAX7503/MAX7504 do not include the timeout feature.

The 2-wire serial interface accepts standard write byte, read byte, send byte, and receive byte commands to read the temperature data and configure the behavior of the open-drain overtemperature shutdown output.

The MAX7500 features three address select lines, while the MAX7501–MAX7504 feature two address select lines and an active-low RESET input. The MAX7500/MAX7501/MAX7502s' 3.0V to 5.5V supply voltage range, low 250µA supply current, and a lockup-protected I²C-compatible interface make them ideal for a wide range of applications, including personal computers (PCs), electronic test equipment, and office electronics.

The MAX7500–MAX7504 are available in 8-pin µMAX® and SO packages and operate over the -55°C to +125°C temperature range.

Simplified Block Diagram

MAX7500, MAX7501, MAX7502, MAX7503, MAX7504: Typical Application Circuit MAX7500, MAX7501, MAX7502, MAX7503, MAX7504: Typical Application Circuit Zoom icon

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