LTC6820 datasheet(2/92 Pages) AD

2 / 92 page

LTC6811-1/LTC6811-2

Rev. C

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TABLE OF CONTENTS

Features............................................................................................................................ 1

Applications ....................................................................................................................... 1

Typical Application ............................................................................................................... 1

Description......................................................................................................................... 1

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

Pin Configuration ................................................................................................................. 3

Order Information................................................................................................................. 4

Electrical Characteristics........................................................................................................ 4

Typical Performance Characteristics .........................................................................................10

Pin Functions .....................................................................................................................16

Block Diagram....................................................................................................................17

Differences Between the LTC6804 and the LTC6811 .......................................................................19

Operation..........................................................................................................................20

State Diagram....................................................................................................................................................... 20

Core LTC6811 State Descriptions......................................................................................................................... 20

isoSPI State Descriptions ..................................................................................................................................... 21

Power Consumption ............................................................................................................................................. 21

ADC Operation ...................................................................................................................................................... 22

Data Acquisition System Diagnostics ................................................................................................................... 29

Watchdog and Discharge Timer............................................................................................................................ 35

Reset Behaviors.................................................................................................................................................... 37

S Pin Pulse Width Modulation for Cell Balancing.................................................................................................. 38

I2C/SPI Master on LTC6811 Using GPIOs............................................................................................................. 39

S Pin Pulsing Using the S Control Register Group................................................................................................ 43

Serial Interface Overview...................................................................................................................................... 44

4-Wire Serial Peripheral Interface (SPI) Physical Layer........................................................................................ 44

2-Wire Isolated Interface (isoSPI) Physical Layer................................................................................................. 45

Data Link Layer..................................................................................................................................................... 52

Network Layer....................................................................................................................................................... 53

Applications Information .......................................................................................................67

Providing DC Power.............................................................................................................................................. 67

Internal Protection and Filtering............................................................................................................................ 69

Cell Balancing ....................................................................................................................................................... 71

Discharge Control During Cell Measurements ...................................................................................................... 73

Digital Communications........................................................................................................................................ 75

Enhanced Applications.......................................................................................................................................... 86

Reading External Temperature Probes.................................................................................................................. 89

Package Description ............................................................................................................90

Revision History .................................................................................................................91

Typical Application ..............................................................................................................92

Related Parts .....................................................................................................................92

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