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PDF DS2422 Data sheet ( Hoja de datos )

Número de pieza DS2422
Descripción 1-Wire Temperature/Datalogger with 8kB Datalog Memory
Fabricantes Dallas 
Logotipo Dallas Logotipo



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No Preview Available ! DS2422 Hoja de datos, Descripción, Manual

www.maxim-ic.com
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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REV: 111403

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DS2422 pdf
3.500
3.000
2.500
2.000
1.500
1.000
0.500
0.000
-0.500
-1.000
-1.500
-2.000
-2.500
DS2422 Temperature Accuracy at 3V
DS2422
Max. ± 0.1°C uncertainty
Min. ±0.25°C uncertainty
Max. ±1°C uncertainty
Temperature (°C)
Min. ± 0.1°C uncertainty
Max. ±0.5°C uncertainty
Min. ±1°C uncertainty
Max. ±0.25°C uncertainty
Min. ±0.5°C uncertainty
"Uncertainty" refers to the uncertainty of the temperature measurement when performing the 2-point calibration trim
as described in the application note. These graphs assume 11-bit temperature conversion. The accuracy can be
improved further through software correction. See the application note referenced as "Note 18" on the previous
page for details.
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DS2422 arduino
DS2422
MEMORY
The memory map of the DS2422 is shown in Figure 7. The 512 bytes general-purpose SRAM are located in pages
0 through 15. The various registers to set up and control the device fill page 16 and 17, called Register Pages 1
and 2 (details in Figure 8). Pages 18 and 19 provide storage space for calibration data. They can alternatively be
used as extension of the general-purpose memory. The Trim Register Page holds registers that are used to tune
the timing of the serial data interface and to trim the on-chip temperature converter. The "datalog" logging memory
starts at address 1000h (page 128) and extends over 256 pages. The memory pages 20 to 31 and 33 to 127 are
reserved for future extensions. The scratchpad is an additional page that acts as a buffer when writing to the SRAM
memory or the register page. The data- and calibration memory can be written at any time. The access type for the
two register pages and the Trim Register Page is register-specific and depends on whether the device is pro-
grammed for a mission. Figures 8A and 8B show the details. The datalog memory is read-only for the user. It is
written solely under supervision of the on-chip control logic. Due to the special behavior of the write access logic
(write scratchpad, copy scratchpad) it is recommended to only write full pages at a time. This also applies to all the
register pages and the calibration memory. See section Address Register and Transfer Status for details.
Figure 8A. DS2422 Register Pages Map
ADDR
b7
b6
b5
b4
b3
b2
b1
0200h
0201h
0202h
0203h
0204h
0205h
0206h
0207h
0208h
0209h
020Ah
020Bh
020Ch
020Dh
020Eh
020Fh
0210h
0211h
0212h
0213h
0214h
0215h
0216h
0217h
0218h
0219h
021Ah
021Bh
021Ch
021Dh
021Eh
021Fh
0220h
0221h
0222h
0223h
0224h
0225h
0226h
0227h
0
0
0
0
CENT
0
0
1
0
1
BOR
1
0
0
0
0
CENT
10 Seconds
Single Seconds
10 Minutes
Single Minutes
12/24
20h.
AM/PM
10h.
Single Hours
0 10 Date
Single Date
0 0 10m.
Single Months
10 Years
Single Years
Low Byte
0 High Byte
Low Threshold
High Threshold
Low Threshold
High Threshold
Low Byte
0000
High Byte
Low Byte
High Byte
0 0 0 0 0 ETHA
1 1 1 1 1 EDHA
0 0 0 0 0 EHSS
1
SUTA
RO
DLFS TLFS
EDL
1 1 1 DHF DLF THF
1
0 WFTA MEMC 0
MIP
LR
Low Byte
Center Byte
High Byte
10 Seconds
Single Seconds
10 Minutes
Single Minutes
12/24
20h.
AM/PM
10h.
Single Hours
0 10 Date
Single Date
0 0 10m.
Single Months
10 Years
Single Years
(no function; reads 00h)
Low Byte
Center Byte
High Byte
Low Byte
Center Byte
High Byte
Configuration Code
EPW
b0 Function
Real-
Time Clock
Registers
0
ETLA
EDLA
EOSC
ETL
TLF
0
Sample
Rate
Temp.
Alarms
Data
Alarms
Latest
Temp.
Latest
Data
T.Alm.En.
D.Alm.En.
RTC En.
Mis. Cntrl.
Alm. Stat.
Gen. Stat.
Start
Delay
Counter
Mission
Time
Stamp
(N/A)
Mission
Samples
Counter
Device
Samples
Counter
Flavor
PW. Cntrl.
Access*
R/W; R
R/W; R
R/W; R
R/W; R
R; R
R; R
R/W; R
R/W; R
R/W; R
R/W; R
R; R
R; R
R/W; R
R; R
R; R
R; R
R; R
R; R
R/W; R
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