SX8744 Просмотр технического описания (PDF) - Semtech Corporation

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SX8744

Precision Diode Digital Temperature For Up To 3 External Sensors

Semtech Corporation 

SX8733/SX8743/SX8744

ADVANCED COMMUNICATIONS & SENSING

DATASHEET

Table of contents

Section

Page

1. Electrical Characteristics ......................................................................................................................................... 3

1.1. Sensor Temperature Definition ........................................................................................................................ 3

1.2. Absolute Maximum Ratings ............................................................................................................................. 3

1.3. Electrical Specification ..................................................................................................................................... 4

1.4. SMBus Timing Characteristics......................................................................................................................... 5

1.5. SMBus Timing Waveforms .............................................................................................................................. 5

2. Pin Configuration ..................................................................................................................................................... 6

2.1. Pinout............................................................................................................................................................... 6

2.2. Pin Description................................................................................................................................................. 6

3. Configuration ........................................................................................................................................................... 7

3.1. General Presentation ....................................................................................................................................... 7

3.2. Modes .............................................................................................................................................................. 7

3.3. Differential and Single-Ended External Sensor.............................................................................................. 10

3.4. Measurement Principle .................................................................................................................................. 10

3.5. Parasitic Track Resistance Cancellation........................................................................................................ 10

3.5.1. Algorithmic Track Resistance Cancellation............................................................................................ 10

3.5.2. 3-Point Track Resistance Cancellation ................................................................................................... 10

3.5.3. The Kelvin (4-wire) Track Resistance Cancellation ................................................................................ 11

3.6. Temperature Acquisition Sequence............................................................................................................... 11

3.7. Alarm.............................................................................................................................................................. 12

3.8. Temperature Data Format ............................................................................................................................. 12

3.9. Continuous Time Vs. Single Shot .................................................................................................................. 13

4. Application Note .................................................................................................................................................... 13

4.1. Typical Temperature Sensing System With A SX8743.................................................................................. 13

5. Power-Up Sequence and Standby Mode .............................................................................................................. 14

6. Serial Interface ...................................................................................................................................................... 14

6.1. Register Write - Combined Format ................................................................................................................ 14

6.2. Register Write - Direct Format ....................................................................................................................... 14

6.3. Register Read - Combined Format ................................................................................................................ 15

6.4. Register Read - Direct Format ....................................................................................................................... 15

6.5. Soft Reset ...................................................................................................................................................... 15

7. Register / Memory Map ......................................................................................................................................... 16

7.1. Memory Map .................................................................................................................................................. 16

7.2. Registers Description..................................................................................................................................... 16

8. Packaging Information ........................................................................................................................................... 20

8.1. MLPD-W6-EP2 Package Outline Drawing..................................................................................................... 20

8.2. MLPD-W6-EP2 Land Pattern Drawing........................................................................................................... 21

8.3. Package Outline Drawing: MSOP-8............................................................................................................... 22

8.4. Land Pattern Drawing: MSOP-8 .................................................................................................................... 23

ACS Revision 2.91/February 2010

©2010 Semtech Corp.

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