1 of 48

REV: 111403

Note: Some revisions of this device may incorporate deviations from published specifications known as errata. Multiple revisions of any device

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

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

TEST_CG

VBAT

PUMP_ONZ

TEST_RX

NC

NC

NC

NC

TEST_SPLY

NC

GND

I/O

VPAD

SCLK

SDATA

CNVST

NC

NC

NC

NC

AGND

X1

ALARM

X2

1

2

3

4

5

6

7

8

9

10

11

12

24

23

22

21

20

19

18

17

16

15

14

13

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 Dallas Semiconductor 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

Commands, Registers, and Modes are capitalized for

clarity.

DS2422

1-Wire Temperature/Datalogger

with 8kB Datalog Memory

www.maxim-ic.com

TOP VIEW

1-Wire is a registered trademark of Dallas Semiconductor.