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AS8525

Datasheet - Contents

Contents

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

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

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3 Applications...............................................................................................................................................................................

1

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

5

4.1 Pin Descriptions.................................................................................................................................................................................... 5

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

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

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6.1 Characteristics of Digital Inputs and Outputs ....................................................................................................................................... 8

6.2 Detailed System and Block Specifications ........................................................................................................................................... 9

6.2.1 Programmable Gain Amplifier (PGA)......................................................................................................................................... 10

6.2.2 VCMREF Generator .................................................................................................................................................................. 11

6.2.3 Voltage Attenuator..................................................................................................................................................................... 11

6.2.4 Voltage Regulators (LDO & ALDO) ........................................................................................................................................... 11

6.2.5 LIN Transceiver ......................................................................................................................................................................... 12

6.2.6 TX Timeout Watchdog ............................................................................................................................................................... 13

6.2.7 Temperature Limiter .................................................................................................................................................................. 13

6.2.8 Other Modules ........................................................................................................................................................................... 14

6.2.9 4-Wire Serial Port Interface ....................................................................................................................................................... 15

6.3 Timing Diagrams ................................................................................................................................................................................ 16

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

17

7.1 Programmable-Gain Amplifier (PGA) / Current-Sense Amplifier (CSA) ............................................................................................. 17

7.2 Voltage Attenuator.............................................................................................................................................................................. 17

7.3 Voltage Regulators (LDO & ALDO) .................................................................................................................................................... 17

7.4 LIN Transceiver .................................................................................................................................................................................. 18

7.5 Temperature Monitor / Limiter............................................................................................................................................................. 18

7.6 VSUP Under-Voltage Reset ............................................................................................................................................................... 18

7.7 RESET................................................................................................................................................................................................ 18

7.8 VCC Under-Voltage Reset.................................................................................................................................................................. 19

7.9 Window Watchdog (WWD)................................................................................................................................................................. 19

7.10 Timeout Watchdog (TWD)................................................................................................................................................................ 19

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

20

8.1 Operating Modes and States.............................................................................................................................................................. 20

8.1.1 Normal Mode ............................................................................................................................................................................. 20

8.1.2 Standby Mode............................................................................................................................................................................ 20

8.1.3 Sleep Mode................................................................................................................................................................................ 20

8.1.4 Temporary Shutdown Mode ...................................................................................................................................................... 20

8.1.5 Thermal Shutdown Mode........................................................................................................................................................... 20

8.2 State Transition Diagram.................................................................................................................................................................... 21

8.3 Initialization......................................................................................................................................................................................... 23

8.4 Wake-Up............................................................................................................................................................................................. 24

8.5 LIN BUS Transceiver.......................................................................................................................................................................... 24

8.5.1 Transmit Mode........................................................................................................................................................................... 24

8.5.2 Receive Mode............................................................................................................................................................................ 24