LTC2984CLX#PBF datasheet, PDF - EEWORLD Datasheet

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LTC2984CLX#PBF: DescriptionTemp Sensor Digital Serial (2-Wire, 3-Wire, 4-Wire, SPI) 48-Pin LQFP Tray; File Size761KB，78 Pages; ManufacturerADI; Websitehttps://www.analog.com

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LTC2984CLX#PBF Overview

Temp Sensor Digital Serial (2-Wire, 3-Wire, 4-Wire, SPI) 48-Pin LQFP Tray

LTC2984CLX#PBF Parametric

Parameter Name	Attribute value
EU restricts the use of certain hazardous substances	Compliant
ECCN (US)	EAR99
Part Status	Active
HTS	8542.39.00.01
Module/IC Classification	IC
Resolution (bit)	24(Min)
Accuracy	0.1°C
Interface Type	Serial (2-Wire, 3-Wire, 4-Wire, SPI)
Output Type	Digital
Minimum Operating Supply Voltage (V)	2.85
Typical Operating Supply Voltage (V)	5\|3.3
Maximum Operating Supply Voltage (V)	5.25
Maximum Supply Current (uA)	20000
Minimum Operating Temperature (°C)	0
Maximum Operating Temperature (°C)	70
Packaging	Tray
Pin Count	48
Standard Package Name	QFP
Supplier Package	LQFP
Mounting	Surface Mount
Package Height	1.45(Max)
Package Length	7
Package Width	7
PCB changed	48
Lead Shape	Gull-wing

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FEATURES

LTC2984

Multi-Sensor High

Accuracy Digital Temperature

Measurement System with EEPROM

DESCRIPTION

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.

Directly Digitizes 2-, 3-, or 4-Wire RTDs,

Thermocouples, Thermistors, and Diodes

On-Chip EEPROM Stores Channel Configuration Data

and Custom Coefficients

Single 2.85V to 5.25V Supply

20 Flexible Inputs Allow Interchanging Sensors

Automatic Thermocouple Cold Junction Compensation

Built-In Standard and User-Programmable Coefficients

for Thermocouples, RTDs and Thermistors

Measures Negative Thermocouple Voltages

Automatic Burn Out, Short-Circuit and Fault Detection

Buffered Inputs Allow External Protection

Simultaneous 50Hz/60Hz Rejection

Includes 15ppm/°C (Max) Reference (I-Grade)

APPLICATIONS

Direct Thermocouple Measurements

Direct RTD Measurements

Direct Thermistor Measurements

Custom Sensor Applications

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.

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

0.1µF

24-BIT

∆∑ ADC

LTC2984

Typical Temperature Error

Contribution

0.5

0.4

0.3

0.2

ERROR (°C)

0.1

–0.1

–0.2

–0.3

–0.4

3904 DIODE

RTD

THERMISTOR

THERMOCOUPLE

SENSE

LINEARIZATION/

FAULT DETECTION

24-BIT

∆∑ ADC

SPI

INTERFACE

°C/°F

4 3

PT-100

RTD

24-BIT

∆∑ ADC

REF

(10ppm/°C)

–0.5

–200 0

200 400 600 800 1000 1200 1400

TEMPERATURE (°C)

2984 TA01b

EEPROM

2984 TA01a

2984fb

For more information

www.linear.com/LTC2984

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 ............................................................................................................76

Revision History .................................................................................................................77

Typical Application ..............................................................................................................78

Related Parts .....................................................................................................................78

2984fb

For more information

www.linear.com/LTC2984

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