INDEX
1. Overview ....................................................................................................................... 2
2. Block Diagram ............................................................................................................... 2
3. Terminal Description .................................................................................................... 3
3.1. Terminal Connections ................................................................................................................. 3
3.2. Pin Functions ............................................................................................................................. 3
4. Connection Example ..................................................................................................... 4
4.1. Battery Switchover connection Examples .................................................................................... 4
5. External Dimensions / Marking Layout ........................................................................... 6
5.1. External Dimensions................................................................................................................... 6
5.2. Marking Layout........................................................................................................................... 6
6. Absolute Maximum Ratings ........................................................................................... 7
7. Recommended Operating Conditions ............................................................................ 7
8. Frequency Characteristics ............................................................................................. 7
9. Electrical Characteristics ............................................................................................... 8
9.1. DC Characteristics..................................................................................................................... 8
9.1.1.DC Characteristics 1 ..................................................................................................... 8
9.1.2. Chargeable Current Characteristics ............................................................................... 9
9.1.3.Reference Value Of Switching Element. ......................................................................... 9
9.2. AC Characteristics ...................................................................................................................10
9.2.1. AC Characteristics 1 ....................................................................................................10
9.2.2. AC Characteristics 2 ....................................................................................................10
10. Power Supply Sequence ........................................................................................... 11
10.1. Power Supply Sequence ..........................................................................................................11
10.2. The behavior and operation restriction at power-ON in RTC ......................................................12
10.3. Reset By Software ...................................................................................................................13
11. Reference information ............................................................................................... 13
11.1. Reference Data .....................................................................................................................13
12. Application Notes ....................................................................................................... 14
13. Overview of Functions and Description Of Registers ................................................ 15
13.1. Overview Of Functions ............................................................................................................15
13.2. Register Table .........................................................................................................................16
13.2.1. Register Table ...........................................................................................................16
13.3. Description Of Registers ..........................................................................................................20
13.3.1. Clock and Calendar Counter (10h 16h) ....................................................................20
13.3.2. Wake-up Timer (Down Counter) (1Ah 1Ch, 2Dh) ......................................................20
13.3.3. Alarm Registers (17h 19h) .......................................................................................20
13.3.4. Function-Related Register (1Dh 1Fh) .......................................................................20
13.3.5. Battery Backup Switchover Function Related Register (32h) .......................................21
13.3.6. Time Stamp Register .................................................................................................21
13.3.7. Operation Status Detection Register (33h) ..................................................................21
13.3.8. User Register (40h 7Fh) ..........................................................................................21
14. How to use ................................................................................................................ 22
14.1. Clock Calendar Function ..........................................................................................................22
14.1.1. Clock Counter ............................................................................................................22
14.1.2. Week Counter............................................................................................................23
14.1.3. Calendar Counter ......................................................................................................23
14.2. Wake-up Timer Interrupt Function ............................................................................................24
14.2.1. Related registers for function of wake-up timer interrupt function .................................24
14.2.2. Wake-up timer start timing..........................................................................................26
14.2.3. Wake-up timer interrupt interval ..................................................................................27
14.2.4. Diagram of wake-up timer interrupt function ................................................................27
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