DS2422 Datasheet, PDF (1/48 Pages) Dallas Semiconductor – 1-Wire Temperature/Datalogger with 8kB Datalog Memory

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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
2
23
3
22
4
21
5
20
6
19
7
18
8
17
9
16
10
15
11
14
12
13
TEST_CG
VBAT
PUMP_ONZ
TEST_RX
NC
NC
NC
NC
TEST_SPLY
NC
GND
I/O
DS2422
1-Wire Temperature/Datalogger
with 8kB Datalog Memory
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.
1-Wire is a registered trademark of Dallas Semiconductor.
Note: Some revisions of this device may incorporate deviations from published specifications known as errata. Multiple revisions of any device
may be simultaneously available through various sales channels. For information about device errata, click here: www.maxim-ic.com/errata.
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