LTC2986HLX-1#PBF datasheet, PDF

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LTC2986HLX-1#PBF: DescriptionIC SENSOR TEMP MEASUREMNT 48LQFP; Categorysemiconductor Power management; File Size897KB，90 Pages; ManufacturerLinear ( ADI ); Websitehttp://www.analog.com/cn/index.html; Environmental Compliance

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LTC2986HLX-1#PBF Overview

IC SENSOR TEMP MEASUREMNT 48LQFP

LTC2986HLX-1#PBF Parametric

Parameter Name	Attribute value
Function	Temperature monitoring system (sensor)
sensor type	external
Sensing temperature	-265°C ~ 1800°C
Accuracy	-
Topology	ADC (sigma delta), multiplexer, register set
Output type	SPI
Output alarm	none
Output fan	none
Voltage - Power	2.85 V ~ 5.25 V
Operating temperature	-40°C ~ 125°C
Installation type	surface mount
Package/casing	48-LQFP
Supplier device packaging	48-LQFP（7x7）

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FEATURES

LTC2986/LTC2986-1

Multi-Sensor High

Accuracy Digital Temperature

Measurement System with EEPROM

DESCRIPTION

The

LTC 2986

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 LTC2986 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. The LTC2986 includes excitation current sources

and fault detection circuitry appropriate for each type of

temperature sensor.

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

Thermocouples, Thermistors, and Diodes

On-Chip EEPROM (LTC2986-1) Stores Channel

Configuration Data and Custom Coefficients

Single 2.85V to 5.25V Supply

10 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

Includes Special Protection Modes

Direct Thermocouple Measurements

Direct RTD Measurements

Direct Thermistor Measurements

Custom Sensor Applications

APPLICATIONS

The LTC2986/LTC2986-1 are 10-channel software and pin-

compatible versions of the 20-channel LTC2983/LTC2984.

Additional features include special modes that enable easy

protection in universal multi-sensor applications, custom

tables for generic ADC readings, and direct temperature

readout from active analog temperature sensors. The

LTC2986-1 is the EEPROM version of the LTC2986.

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

LTC2986-1

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

24-BIT

∆∑ ADC

LINEARIZATION/

FAULT DETECTION

SPI

INTERFACE

°C/°F

4 3

PT-100

RTD

24-BIT

∆∑ ADC

REF

(15ppm/°C)

COM

29861 TA01a

–0.5

–200 0

200 400 600 800 1000 1200 1400

TEMPERATURE (°C)

29861 TA01b

EEPROM

29861fa

For more information

www.linear.com/LTC2986

LTC2986/LTC2986-1

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

LTC2986-1 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 (LTC2986-1) .......................................................................................................................... 23

EEPROM Read/Write Validation ............................................................................................................................ 23

EEPROM Write Operation ..................................................................................................................................... 23

EEPROM Read Operation (LTC2986-1)................................................................................................................. 24

Thermocouple Measurements .............................................................................................................................. 25

Diode Measurements ............................................................................................................................................ 28

RTD Measurements .............................................................................................................................................. 32

Thermistor Measurements .................................................................................................................................... 51

Global Configuration Register ............................................................................................................................... 60

Input Overvoltage Protection – Overview.............................................................................................................. 60

Active Analog Temperature Sensors ..................................................................................................................... 66

Direct ADC Measurements .................................................................................................................................... 70

2- and 3-Cycle Conversion Modes ........................................................................................................................ 75

Running Conversions Consecutively on Multiple Channels................................................................................... 75

Entering/Exiting Sleep Mode ................................................................................................................................. 76

MUX Configuration Delay...................................................................................................................................... 76

Reference Considerations ..................................................................................................................................... 76

Custom Thermocouples .........................................................................................................77

Custom RTDs .....................................................................................................................80

Custom Thermistors .............................................................................................................83

Package Description ............................................................................................................88

Revision History .................................................................................................................89

Typical Application ..............................................................................................................90

Related Parts .....................................................................................................................90

29861fa

For more information

www.linear.com/LTC2986

LTC2986HLX-1#PBF Related Products

	LTC2986HLX-1#PBF	LTC2986ILX-1#PBF	LTC2986CLX-1#PBF	LTC2986CLX#PBF	LTC2986ILX#PBF	LTC2986HLX#PBF
Description	IC SENSOR TEMP MEASUREMNT 48LQFP	IC SENSOR TEMP MEASUREMNT 48LQFP	IC SENSOR TEMP MEASUREMNT 48LQFP	IC SENSOR TEMP MEASUREMNT 48LQFP	IC SENSOR TEMP MEASUREMNT 48LQFP	IC SENSOR TEMP MEASUREMNT 48LQFP
Function	Temperature monitoring system (sensor)	Temperature monitoring system (sensor)	Temperature monitoring system (sensor)	Temperature monitoring system (sensor)	Temperature monitoring system (sensor)	Temperature monitoring system (sensor)
sensor type	external	external	external	external	external	external
Sensing temperature	-265°C ~ 1800°C	-265°C ~ 1800°C	-265°C ~ 1800°C	-265°C ~ 1800°C	-265°C ~ 1800°C	-265°C ~ 1800°C
Topology	ADC (sigma delta), multiplexer, register set	ADC (sigma delta), multiplexer, register set	ADC (sigma delta), multiplexer, register set	ADC (sigma delta), multiplexer, register set	ADC (sigma delta), multiplexer, register set	ADC (sigma delta), multiplexer, register set
Output type	SPI	SPI	SPI	SPI	SPI	SPI
Output alarm	none	none	none	none	none	none
Output fan	none	none	none	none	none	none
Voltage - Power	2.85 V ~ 5.25 V	2.85 V ~ 5.25 V	2.85 V ~ 5.25 V	2.85 V ~ 5.25 V	2.85 V ~ 5.25 V	2.85 V ~ 5.25 V
Operating temperature	-40°C ~ 125°C	-40°C ~ 85°C	0°C ~ 70°C	0°C ~ 70°C	-40°C ~ 85°C	-40°C ~ 125°C
Installation type	surface mount	surface mount	surface mount	surface mount	surface mount	surface mount
Package/casing	48-LQFP	48-LQFP	48-LQFP	48-LQFP	48-LQFP	48-LQFP
Supplier device packaging	48-LQFP（7x7）	48-LQFP（7x7）	48-LQFP（7x7）	48-LQFP（7x7）	48-LQFP（7x7）	48-LQFP（7x7）

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Shortcut: 00 01 02 03 04 05 06 07 08 09 0A 0C 0F 0J 0L 0M 0R 0S 0T 0Z 10 11 12 13 14 15 16 17 18 19 1A 1B 1C 1D 1E 1F 1H 1K 1M 1N 1P 1S 1T 1V 1X 1Z 20 21 22 23 24 25 26 27 28 29 2A 2B 2C 2D 2E 2F 2G 2K 2M 2N 2P 2Q 2R 2S 2T 2W 2Z 30 31 32 33 34 35 36 37 38 39 3A 3B 3C 3D 3E 3F 3G 3H 3J 3K 3L 3M 3N 3P 3R 3S 3T 3V 40 41 42 43 44 45 46 47 48 49 4A 4B 4C 4D 4M 4N 4P 4S 4T 50 51 52 53 54 55 56 57 58 59 5A 5B 5C 5E 5G 5H 5K 5M 5N 5P 5S 5T 5V 60 61 62 63 64 65 66 67 68 69 6A 6C 6E 6F 6M 6N 6P 6R 6S 6T 70 71 72 73 74 75 76 77 78 79 7A 7B 7C 7M 7N 7P 7Q 7V 7W 7X 80 81 82 83 84 85 86 87 88 89 8A 8D 8E 8L 8N 8P 8S 8T 8W 8Y 8Z 90 91 92 93 94 95 96 97 98 99 9A 9B 9C 9D 9F 9G 9H 9L 9S 9T 9W

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