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AS8520

Preliminary Data Sheet - C o n t e n t s

Contents

1 General Description.................................................................................................................................................................... 1

2 Key Features ............................................................................................................................................................................... 1

3 Applications ................................................................................................................................................................................ 1

4 Pin Assignments......................................................................................................................................................................... 4

4.1 Pin Descriptions........................................................................................................................................................................................ 4

5 Absolute Maximum Ratings....................................................................................................................................................... 6

6 Electrical Characteristics........................................................................................................................................................... 7

6.1 Detailed System and Block Specifications ............................................................................................................................................... 8

6.1.1 Low Dropout Regulator................................................................................................................................................................. 8

6.1.2 LIN Transceiver ............................................................................................................................................................................ 9

7 Detailed Description ................................................................................................................................................................. 14

7.1 Block Description.................................................................................................................................................................................... 14

7.1.1 Voltage Regulator (LDO) ............................................................................................................................................................ 14

7.1.2 Temperature Limiter ................................................................................................................................................................... 14

7.1.3 VSUP Undervoltage Reset ......................................................................................................................................................... 14

7.1.4 RESET........................................................................................................................................................................................ 14

7.1.6 Window Watchdog (WWD) ......................................................................................................................................................... 15

7.1.7 Resistive Divider ......................................................................................................................................................................... 16

7.1.8 HV Low Side Relay Driver Switches........................................................................................................................................... 16

7.1.9 LIN Transceiver .......................................................................................................................................................................... 16

7.2 Operating Modes and States.................................................................................................................................................................. 16

7.2.1 Normal Mode .............................................................................................................................................................................. 16

7.2.2 Standby Mode............................................................................................................................................................................. 17

7.2.3 Sleep Mode................................................................................................................................................................................. 17

7.2.4 Temporary Shutdown Mode ....................................................................................................................................................... 17

7.2.5 Thermal Shutdown State ............................................................................................................................................................ 17

7.3 State Diagram......................................................................................................................................................................................... 19

8 Application Information............................................................................................................................................................ 20

8.1 Initialization............................................................................................................................................................................................. 20

8.2 Wake-Up................................................................................................................................................................................................. 21

8.3 Over-Temperature Shutdown ................................................................................................................................................................. 21

8.4 LIN BUS Transceiver.............................................................................................................................................................................. 21

8.4.1 Transmit Mode............................................................................................................................................................................ 21

8.4.2 Receive Mode............................................................................................................................................................................. 21

8.5 RX and TX Interface............................................................................................................................................................................... 22

8.5.1 Input TX ...................................................................................................................................................................................... 22

8.5.2 Output RX................................................................................................................................................................................... 22

8.6 MODE Input EN...................................................................................................................................................................................... 23

8.7 Serial Port Interface................................................................................................................................................................................ 25

8.7.1 Device Configuration using 4-Wire Serial Port ........................................................................................................................... 25

8.8 Control and Diagnosis Registers ............................................................................................................................................................ 29

8.8.1 Definition of Control and Status Registers.................................................................................................................................. 29

8.9 ESD/EMC REMARKS ............................................................................................................................................................................ 31