BU21181FS
Contents
General Description ................................................................................................................................................................1
Features .................................................................................................................................................................................1
Applications ............................................................................................................................................................................1
Key Specifications...................................................................................................................................................................1
Package .................................................................................................................................................................................1
Typical Application Circuit........................................................................................................................................................1
Pin Configuration ....................................................................................................................................................................3
Pin Description........................................................................................................................................................................3
Block Diagram ........................................................................................................................................................................5
Description of Block ................................................................................................................................................................5
Absolute Maximum Ratings .....................................................................................................................................................7
Thermal Resistance ................................................................................................................................................................7
Recommended Operating Conditions ......................................................................................................................................8
Electrical Characteristics .........................................................................................................................................................8
Interface Specification.............................................................................................................................................................9
2-wire Serial Bus Interface Electrical Characteristics.............................................................................................................9
2-wire Serial Bus Protocol.................................................................................................................................................. 10
Power-on Sequence / Reset Timing....................................................................................................................................... 11
Power-on Flowchart........................................................................................................................................................... 11
Power-on Timing ............................................................................................................................................................... 11
Power-restart Timing.......................................................................................................................................................... 12
Reset Timing ..................................................................................................................................................................... 12
External Capacitor Specification ............................................................................................................................................ 12
Register Map ........................................................................................................................................................................ 13
Register Description.............................................................................................................................................................. 18
I/O Equivalence Circuit.......................................................................................................................................................... 39
Operational Notes ................................................................................................................................................................. 40
Ordering Information ............................................................................................................................................................. 41
Marking Diagram................................................................................................................................................................... 41
Physical Dimension and Packing Information ......................................................................................................................... 42
Revision History.................................................................................................................................................................... 43
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