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DS1922T Schematic ( PDF Datasheet ) - Dallas Semiconductor

Teilenummer DS1922T
Beschreibung (DS1922L/T) Temperature Logger iButton
Hersteller Dallas Semiconductor
Logo Dallas Semiconductor Logo 




Gesamt 30 Seiten
DS1922T Datasheet, Funktion
www.maxim-ic.com
GENERAL DESCRIPTION
The DS1922L/T temperature logger iButtons® are
rugged, self-sufficient systems that measure
temperature and record the result in a protected
memory section. The recording is done at a user-
defined rate. A total of 8192 8-bit readings or 4096
16-bit readings taken at equidistant intervals ranging
www.DataShfreoemt4U1.csomto 273hrs can be stored. In addition to this,
there are 512 bytes of SRAM for storing application-
specific information and 64 bytes for calibration data.
A mission to collect data can be programmed to
begin immediately, or after a user-defined delay or
after a temperature alarm. Access to the memory and
control functions can be password protected. The
DS1922L/T is configured and communicates with a
host computing device through the serial 1-Wire®
protocol, which requires only a single data lead and a
ground return. Every DS1922L/T is factory-lasered
with a guaranteed unique 64-bit registration number
that allows for absolute traceability. The durable
stainless-steel package is highly resistant to
environmental hazards such as dirt, moisture, and
shock. Accessories permit the DS1922L/T to be
mounted on almost any object, including containers,
pallets, and bags.
APPLICATIONS
Temperature Logging in Cold Chain, Food Safety,
Bio Science, and Pharmaceutical and Medical
Products
High-Temperature Logging (Process Monitoring,
Industrial Temperature Monitoring)
ORDERING INFORMATION
PART
TEMP RANGE
PACKAGE
DS1922L-F5 -40°C to +85°C F5 iButton
DS1922T-F5 0°C to +125°C F5 iButton
See page 11 for Common iButton Features and
Examples of Accessories.
Commands, Registers, and Modes are capitalized for
clarity.
iButton and 1-Wire are registered trademarks of Dallas Semiconductor.
DS1922L, DS1922T
Temperature Logger iButton
With 8kB Datalog Memory
SPECIAL FEATURES
§ Automatically Wakes up, Measures Tempera-
ture, and Stores Values in 8kB of Datalog
Memory in 8- or 16-Bit Format
§ Digital Thermometer Measures Temperature with
8-Bit (0.5°C) or 11-Bit (0.0625°C) Resolution
§ Accuracy Better than ±0.5°C from -10°C to
+65°C (DS1922L), ±0.5°C from +20°C to +75°C
(DS1922T) with Software Correction
§ Water resistant - 1 meter under water for 30 days
§ 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 Alarms
§ Quick Access to Alarmed Devices Through
1-Wire Conditional Search Function
§ 512 Bytes of General-Purpose Plus 64 Bytes of
Calibration Memory
§ Two-Level Password Protection of All Memory
and Configuration Registers
§ Communicates to Host with a Single Digital
Signal at up to 15.4kbps at Standard Speed or
up to 125kbps in Overdrive Mode Using 1-Wire
Protocol
§ Operating Range: DS1922L: -40 to +85°C;
DS1922T: 0 to +125°C
PIN CONFIGURATION
5.89
0.51
â
16.25
0A010000FBCâ524B1
1-Wireâ
17.35
IO GND
ALL DIMENSIONS ARE SHOWN IN MILLIMETERS.
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: 121003






DS1922T Datasheet, Funktion
DS1922L/DS1922T
DS1922T MINIMUM PRODUCT LIFETIME VS. TEMPERATURE, SLOW SAMPLING
Every Minute
Every 60 Min.
Every 3 Min.
No Samples
Every 10 Min.
Osc. Off
10
9
8
7
6
5
www.DataSheet4U.com4
3
2
1
0
0
10 20 30 40 50 60 70 80 90 100 110 120
DS1922T: Temperature (°C)
Every Minute
Every 30 Min.
No Samples
Every 3 Min.
Every 60 Min.
Osc. Off
Every 10 Min.
Every 300 Min.
10
9
8
7
6
5
4
3
2
1
0
0
10 20
30 40 50 60 70 80 90 100 110 120
DS1922T: Temperature (°C)
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6 Page









DS1922T pdf, datenblatt
Figure 1. DS1922L/T Block Diagram
1-Wire
Port
I/O
ROM
Function
Control
64-Bit
Lasered
ROM
DS1922L/DS1922T
Parasite
Powered
Circuitry
www.DataSheet4U.com
3V Lithium
32.768kHz
Oscillator
Thermal
Sense
Memory
Function
Control
Internal
Timekeeping &
Control Reg. &
Counters
General-Purpose
SRAM
(512 Bytes)
Register Pages
(64 Bytes)
ADC
Calibration Memory
(64 Bytes)
Control
Logic
Datalog
Memory
8k Bytes
256-Bit
Scratchpad
PARASITE POWER
The block diagram (Figure 1) shows the parasite-powered circuitry. This circuitry “steals” power whenever the I/O
input is high. I/O will provide sufficient power as long as the specified timing and voltage requirements are met. The
advantages of parasite power are two-fold: 1) by parasiting off this input, battery power is conserved; and 2) if the
battery is exhausted for any reason, the ROM may still be read.
64-BIT LASERED ROM
Each DS1922L/T contains a unique ROM code that is 64 bits long. The first 8 bits are a 1-Wire family code. The
next 48 bits are a unique serial number. The last 8 bits are a CRC of the first 56 bits. See Figure 3 for details. The
1-Wire CRC is generated using a polynomial generator consisting of a shift register and XOR gates as shown in
Figure 4. The polynomial is X8 + X5 + X4 + 1. Additional information about the Dallas 1-Wire Cyclic Redundancy
Check (CRC) is available in Application Note 27 and in the Book of DS19xx iButton Standards.
The shift register bits are initialized to 0. Then starting with the least significant bit of the family code, one bit at a
time is shifted in. After the 8th bit of the family code has been entered, then the serial number followed by the
temperature range code is entered. After the range code has been entered, the shift register contains the CRC
value. Shifting in the 8 bits of CRC returns the shift register to all 0s.
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12 Page





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