PIM449 Pimoroni

RV-3028-C7 Application Manual Application Manual RV-3028-C7 Extreme Low Power Real-Time Clock Module 2 with I C-Bus Interface November 2021 1/116 Rev. 1.4 Micro Crystal Extreme Low Power Real-Time Clock Module RV-3028-C7 TABLE OF CONTENTS 1. OVERVIEW ....................................................................................................................................................... 6 1.1. GENERAL DESCRIPTION ......................................................................................................................... 6 1.2. APPLICATIONS ......................................................................................................................................... 7 1.3. ORDERING INFORMATION ...................................................................................................................... 7 2. BLOCK DIAGRAM ............................................................................................................................................ 8 2.1. PINOUT ...................................................................................................................................................... 9 2.2. PIN DESCRIPTION .................................................................................................................................... 9 2.3. FUNCTIONAL DESCRIPTION ................................................................................................................. 10 2.4. DEVICE PROTECTION DIAGRAM ......................................................................................................... 10 3. REGISTER ORGANIZATION ......................................................................................................................... 11 3.1. REGISTER CONVENTIONS .................................................................................................................... 11 3.2. REGISTER OVERVIEW ........................................................................................................................... 12 3.3. CLOCK REGISTERS ............................................................................................................................... 14 3.4. CALENDAR REGISTERS ........................................................................................................................ 16 3.5. ALARM REGISTERS ............................................................................................................................... 18 3.6. PERIODIC COUNTDOWN TIMER CONTROL REGISTERS .................................................................. 20 3.7. STATUS AND CONTROL REGISTERS .................................................................................................. 22 3.8. EVENT CONTROL REGISTER ............................................................................................................... 26 3.9. TIME STAMP REGISTERS ...................................................................................................................... 27 3.10. UNIX TIME REGISTERS .......................................................................................................................... 30 3.11. RAM REGISTERS .................................................................................................................................... 31 3.12. PASSWORD REGISTERS ....................................................................................................................... 32 3.13. EEPROM MEMORY CONTROL REGISTERS ........................................................................................ 33 3.14. ID REGISTER ........................................................................................................................................... 35 3.15. CONFIGURATION EEPROM WITH RAM MIRROR REGISTERS .......................................................... 35 3.15.1. EEPROM RESERVED ...................................................................................................................... 35 3.15.2. EEPROM PASSWORD ENABLE REGISTER .................................................................................. 35 3.15.3. EEPROM PASSWORD REGISTERS ............................................................................................... 36 3.15.4. EEPROM CLKOUT REGISTER ........................................................................................................ 37 3.15.5. EEPROM OFFSET REGISTER ........................................................................................................ 38 3.15.6. EEPROM BACKUP REGISTER ....................................................................................................... 39 3.16. USER EEPROM ....................................................................................................................................... 40 3.17. RESERVED EEPROM ............................................................................................................................. 40 3.18. REGISTER RESET VALUES SUMMARY ............................................................................................... 41 4. DETAILED FUNCTIONAL DESCRIPTION .................................................................................................... 44 4.1. POWER ON RESET (POR) ...................................................................................................................... 44 4.2. AUTOMATIC BACKUP SWITCHOVER FUNCTION............................................................................... 45 4.2.1. SWITCHOVER DISABLED ............................................................................................................... 46 November 2021 2/116 Rev. 1.4