SX8722 데이터 시트보기 (PDF) - Semtech Corporation

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SX8722

High gain acquisition for sensor interface

Semtech Corporation 

SX8722

High gain acquisition for sensor interface

ADVANCED COMMUNICATIONS & SENSING

Table of contents

DATASHEET

Section

Page

1. Specifications........................................................................................................................................................... 6

1.1. Absolute Maximum Ratings ............................................................................................................................. 6

1.2. Operating conditions ........................................................................................................................................ 6

1.3. ZoomingADC Specifications ............................................................................................................................ 7

2. Pin configuration and marking information ............................................................................................................ 10

2.1. Pin configuration ............................................................................................................................................ 10

2.2. Marking information ....................................................................................................................................... 10

3. Pin Description....................................................................................................................................................... 11

4. Timing Characteristics ........................................................................................................................................... 13

4.1. I2C timing Waveforms.................................................................................................................................... 13

4.2. Time specification without the 32.768 kHz Xtal ............................................................................................. 14

4.3. Start-up time with the 32.768 kHz Xtal presence........................................................................................... 14

4.4. Changing power mode by pin signal.............................................................................................................. 14

4.5. Changing power mode by I2C command....................................................................................................... 15

5. Circuit description .................................................................................................................................................. 16

5.1. Detailed bloc diagram .................................................................................................................................... 16

5.2. Functional description .................................................................................................................................... 16

5.3. ZoomingADC ................................................................................................................................................. 19

6. Access the SX8722 ............................................................................................................................................... 20

6.1. Description ..................................................................................................................................................... 20

6.2. SX8722 configuration..................................................................................................................................... 20

7. I2C Commands...................................................................................................................................................... 20

8. Serial communication ............................................................................................................................................ 21

8.1. Write data direct............................................................................................................................................. 21

8.2. Write data masked ......................................................................................................................................... 22

8.3. Read data ...................................................................................................................................................... 22

8.4. Other commands ........................................................................................................................................... 23

8.5. Unknown commands ..................................................................................................................................... 23

8.6. Reading data after a measurement. .............................................................................................................. 23

9. Predefined settings ................................................................................................................................................ 24

9.1. Introduction .................................................................................................................................................... 24

9.2. Features covered by predefined settings....................................................................................................... 24

9.3. Input multiplexers........................................................................................................................................... 25

9.3.1. Overview ................................................................................................................................................. 25

9.3.2. Input channel selection ........................................................................................................................... 25

9.3.3. Reference channel selection................................................................................................................... 26

9.3.4. Application example................................................................................................................................ 26

9.4. Programmable gain amplifier settings............................................................................................................ 28

9.4.1. Overview ................................................................................................................................................. 28

ACS - Revision 4.2

©2008 Semtech Corp.

October 2008

Page 2

www.semtech.com

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