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Linear Technology Electronic Components Datasheet

LTC2984 Datasheet

Multi-Sensor High Accuracy Digital Temperature Measurement System

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LTC2984
FEATURES
Multi-Sensor High
Accuracy Digital Temperature
Measurement System with EEPROM
DESCRIPTION
nn Directly Digitizes 2-, 3-, or 4-Wire RTDs,
Thermocouples, Thermistors, and Diodes
nn On-Chip EEPROM Stores Channel Configuration Data
and Custom Coefficients
nn Single 2.85V to 5.25V Supply
nn 20 Flexible Inputs Allow Interchanging Sensors
nn Automatic Thermocouple Cold Junction Compensation
nn Built-In Standard and User-Programmable Coefficients
for Thermocouples, RTDs and Thermistors
nn Measures Negative Thermocouple Voltages
nn Automatic Burn Out, Short-Circuit and Fault Detection
nn Buffered Inputs Allow External Protection
nn Simultaneous 50Hz/60Hz Rejection
nn Includes 15ppm/°C (Max) Reference (I-Grade)
APPLICATIONS
nn Direct Thermocouple Measurements
nn Direct RTD Measurements
nn Direct Thermistor Measurements
nn Custom Sensor Applications
The LTC®2984 measures a wide variety of temperature
sensors and digitally outputs the result, in °C or °F, with
0.1°C accuracy and 0.001°C resolution. The LTC2984 can
measure the temperature of virtually all standard (type B,
E, J, K, N, S, R, T) or custom thermocouples, automatically
compensate for cold junction temperatures and linearize
the results. The device can also measure temperature with
standard 2-, 3-, or 4-wire RTDs, thermistors, and diodes.
It has 20 reconfigurable analog inputs enabling many sen-
sor connections and configuration options. The LTC2984
includes excitation current sources and fault detection
circuitry appropriate for each type of temperature sensor
as well as an EEPROM for storing custom coefficients and
channel configuration data.
The LTC2984 allows direct interfacing to ground referenced
sensors without the need for level shifters, negative supply
voltages, or external amplifiers. All signals are buffered and
simultaneously digitized with three high accuracy, 24-bit ∆∑
ADC's, driven by an internal 10ppm/°C (maximum) reference.
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
Patents Pending
TYPICAL APPLICATION
Thermocouple Measurement with Automatic Cold Junction Compensation
2.85V TO 5.25V
1k
0.1µF
1k
24-BIT
∆∑ ADC
LTC2984
RSENSE
2k
43
PT-100
RTD
2
1
24-BIT
∆∑ ADC
LINEARIZATION/
FAULT DETECTION
SPI
INTERFACE
°C/°F
24-BIT
∆∑ ADC
VREF (10ppm/°C)
EEPROM
2984 TA01a
For more information www.linear.com/LTC2984
Typical Temperature Error
Contribution
0.5
0.4
0.3 THERMISTOR
0.2 THERMOCOUPLE
0.1
0
–0.1
–0.2 3904 DIODE
–0.3 RTD
–0.4
–0.5
–200 0
200 400 600 800 1000 1200 1400
TEMPERATURE (°C)
2984 TA01b
2984f
1


Linear Technology Electronic Components Datasheet

LTC2984 Datasheet

Multi-Sensor High Accuracy Digital Temperature Measurement System

No Preview Available !

LTC2984
TABLE OF CONTENTS
Features............................................................................................................................. 1
Applications........................................................................................................................ 1
Typical Application ................................................................................................................ 1
Description......................................................................................................................... 1
Absolute Maximum Ratings...................................................................................................... 3
Order Information.................................................................................................................. 3
Pin Configuration.................................................................................................................. 3
Complete System Electrical Characteristics................................................................................... 4
ADC Electrical Characteristics................................................................................................... 4
Reference Electrical Characteristics............................................................................................ 5
Digital Inputs and Digital Outputs............................................................................................... 5
EEPROM Characteristics.......................................................................................................... 6
Typical Performance Characteristics........................................................................................... 7
Pin Functions......................................................................................................................10
Block Diagram.....................................................................................................................11
Test Circuits.......................................................................................................................12
Timing Diagram...................................................................................................................12
Overview........................................................................................................................... 13
Applications Information........................................................................................................17
EEPROM Overview................................................................................................................................................ 23
EEPROM Read/Write Validation............................................................................................................................. 23
EEPROM Write Operation...................................................................................................................................... 23
EEPROM Read Operation....................................................................................................................................... 24
Thermocouple Measurements............................................................................................................................... 25
Diode Measurements............................................................................................................................................. 28
RTD Measurements............................................................................................................................................... 32
Thermistor Measurements..................................................................................................................................... 50
Supplemental Information.......................................................................................................61
Direct ADC Measurements..................................................................................................................................... 61
Fault Protection and Anti-Aliasing.......................................................................................................................... 63
2- and 3-Cycle Conversion Modes......................................................................................................................... 63
Running Conversions Consecutively on Multiple Channels.................................................................................... 64
Entering/Exiting Sleep Mode.................................................................................................................................. 64
MUX Configuration Delay....................................................................................................................................... 64
Global Configuration Register................................................................................................................................ 65
Reference Considerations...................................................................................................................................... 65
Custom Thermocouples..........................................................................................................65
Custom RTDs......................................................................................................................68
Custom Thermistors..............................................................................................................71
Package Description.............................................................................................................77
Typical Application...............................................................................................................78
Related Parts......................................................................................................................78
2984f
2 For more information www.linear.com/LTC2984


Part Number LTC2984
Description Multi-Sensor High Accuracy Digital Temperature Measurement System
Maker Linear Technology
Total Page 30 Pages
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