MAX31826 Datasheet, PDF(1/22 Page) Maxim Integrated Products – 1-Wire Digital Temperature Sensor with 1Kb Lockable EEPROM

19-6264; Rev 0; 3/12

MAX31826

1-Wire Digital Temperature Sensor

with 1Kb Lockable EEPROM

General Description

The MAX31826 digital thermometer provides 12-bit

temperature measurements and communicates over a

1-WireM bus that by definition requires only one data line

(and ground) for communication with a central microcon-

troller. It has a -55NC to +125NC operating temperature

range and is accurate to Q0.5NC over the -10NC to +85NC

range. In addition, the device can derive power directly

from the data line (âparasite powerâ), eliminating the

need for an external power supply.

Each device has a unique 64-bit serial code, which

allows multiple devices to function on the same 1-Wire

bus. Therefore, it is simple to use one microcontroller

(the master device) to control many devices distributed

over a large area. The device includes 128 bytes (1Kb)

of EEPROM for storage of system data. The EEPROM

can be locked to permanently prevent any further data

writes. Four location address inputs simplify mapping of

individual devices to specific locations.

Applications

Industrial Systems

Building Automation

Consumer Equipment

System Calibration

Module Identification

Benefits and Features

S Unique 1-Wire Interface Requires Only One Port

Pin for Communication

S Integrated Temperature Sensor and EEPROM

Reduce Component Count

ï² Measures Temperatures from -55NC to +125NC

(-67NF to +257NF)

ï² Â±0.5NC Accuracy from -10NC to +85NC

ï² 12-Bit Temperature Resolution (0.0625NC)

ï² 1Kb EEPROM Can Be Locked to Prevent Further

Writes

S Multidrop Capability Simplifies Multisensor

Systems

ï² Each Device Has a Unique 64-Bit Serial Code

Stored in On-Board ROM

ï² Four Pin-Programmable Bits to Uniquely

Identify Up to 16 Sensor Locations on a Bus

S Can Be Powered from Data Line (3.0V to 3.7V

Power-Supply Range)

S 8-Pin ÂµMAXÂ® Package

Ordering Information appears at end of data sheet.

For related parts and recommended products to use with this part,

refer to www.maxim-ic.com/MAX31826.related.

Block Diagram

VPU

4.7kâ¦

GND

PARASITE-

POWER

CIRCUIT

CPP

64-BIT ROM

AND

1-Wire PORT

MEMORY

CONTROL LOGIC

1Kb

EEPROM

SCRATCHPAD 2

MAX31826

POWER-

VDD

SUPPLY

SENSE

SCRATCHPAD 1

16-BIT TEMPERATURE REGISTER

8-BIT CRC GENERATOR

8-BIT CONFIGURATION REGISTER

ADDRESS PIN

INPUT LATCH

AD0 AD1 AD2 AD3

1-Wire and ÂµMAX are registered trademarks of Maxim Integrated Products, Inc.

For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,

or visit Maximâs website at www.maxim-ic.com.

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