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DS2422

1-Wire Temperature/Datalogger with 8KB Datalog Memory

Maxim Integrated 

AVAILABLE

DS2422

1-Wire Temperature/Datalogger

with 8KB Datalog Memory

GENERAL DESCRIPTION

The DS2422 temperature/datalogger combines the

core functions of a fully featured datalogger in a

single chip. It includes a temperature sensor, real-

time clock (RTC), memory, 1-Wire® interface, and

serial interface for an analog-to-digital converter

(ADC) as well as control circuitry for a charge pump.

The ADC and the charge pump are peripherals that

can be added to build application-specific

dataloggers. Without external ADC, the DS2422

functions as a temperature logger only. The DS2422

measures the temperature and/or reads the ADC at a

user-defined rate. A total of 8192 8-bit readings or

4096 16-bit readings taken at equidistant intervals

ranging from 1s 273hrs can be stored.

APPLICATIONS

Temperature Logging in Cold Chain, Food Safety,

and Bio Science

High-Temperature Logging (Process Monitoring,

industrial Temperature Monitoring)

General-Voltage Datalogging (Pressure, Humidity,

Light, Material Stress)

PIN CONFIGURATION

TOP VIEW

VPAD

SCLK

SDATA

CNVST

NC

NC

NC

NC

AGND

X1

ALARM

X2

1

24

TEST_CG

2Func2t3ionaVlBADT iagrams

3

22

PUMP_ONZ

4

21

TEST_RX

5

20

NC

6

19

NC

7

18

NC

8

17

NC

9

16

TEST_SPLY

10

15

NC

11

14

GND

12

13

I/O

FEATURES

 Automatically Wakes Up, Measures Temperature

and/or Reads an External ADC and Stores

Values in 8KB of Datalog Memory in 8 or 16-Bit

Format

 On-Chip Direct-to-Digital Temperature Converter

with 8-Bit (0.5°C) or 11-Bit (0.0625°C) Resolution

 Sampling Rate from 1s up to 273hrs

 Programmable Recording Start Delay After

Elapsed Time or Upon a Temperature Alarm Trip

Point

 Programmable High and Low Trip Points for

Temperature and Data Alarms

 Quick Access to Alarmed Devices Through

1-Wire Conditional Search Function

 512 Bytes of General-Purpose Memory Plus 64

Bytes of Calibration Memory

 Two-Level Password Protection of all Memory

and Configuration Registers

 Unique Factory-Lasered 64-Bit Registration

Number Assures Error-Free Device Selection

and Absolute Part Identity

 Built-in Multidrop Controller Ensures Com-

patibility with Other Maxim 1-Wire Net Products

 Directly Connects to a Single Port Pin of a Mi-

croprocessor and Communicates at Up to

15.4kbps at Standard Speed or up to 125kbps in

Overdrive Mode

 -40°C to +85°C Operating Range

 2.8V to 3.6V Single-Supply Battery Operation

 Low Power (1.2µA Standby, 350µA Active)

ORDERING INFORMATION

PART

TEMP RANGE

PIN-PACKAGE

DS2422S+

-40C to +85C

24-lead, 300-mil

SO

+Denotes a lead(Pb)-free/RoHS-compliant product.

Commands, Registers, and Modes are capitalized for

clarity.

1-Wire is a registered trademark of Maxim Integrated Products, Inc.

Pin Configurations appear at end of data sheet.

NotFeu: nScotmioenraelvDisiaognsraomf tshicsodnetvinicueemdaayt ienncodrpoofrdaatetadesvhieaetiot.ns from published specifications known as errata. Multiple revisions of any device

mayUbCeSsPimisualtatrnaedoeumslayrakvoafilMabaleximthrIonutgehgrvaateridouPsrosadluecstsc,hIanncn.els. For information about device errata, click here: www.maxim-ic.com/errata.

For pricing, delivery, and ordering information, please contact Maxim Direct

at 1-888-629-4642, or visit Maxim’s website at www.maximintegrated.com.

19-4866; 5/10

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