BOB-16281 SparkFun

RV-8803-C7 Application Manual Application Manual RV-8803-C7 DTCXO Temp. Compensated Real-Time Clock Module 2 with I C-Bus Interface May 2019 1/74 Rev. 1.6 Micro Crystal 2 DTCXO Temp. Compensated Real-Time Clock Module with I C-Bus Interface RV-8803-C7 TABLE OF CONTENTS 1. OVERVIEW ..................................................................................................................................................... 5 1.1. GENERAL DESCRIPTION ......................................................................................................................... 5 1.2. APPLICATIONS ......................................................................................................................................... 6 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 OVERVIEW ........................................................................................................................... 11 3.2. CLOCK REGISTERS ............................................................................................................................... 13 3.3. CALENDAR REGISTERS ........................................................................................................................ 14 3.4. ALARM REGISTERS ............................................................................................................................... 16 3.5. PERIODIC COUNTDOWN TIMER CONTROL REGISTERS .................................................................. 18 3.6. EXTENSION REGISTER .......................................................................................................................... 19 3.7. FLAG REGISTER ..................................................................................................................................... 20 3.8. CONTROL REGISTER ............................................................................................................................. 21 3.9. OFFSET REGISTER ................................................................................................................................ 22 3.10. CAPTURE BUFFER/EVENT CONTROL REGISTERS ........................................................................... 23 3.11. REGISTER RESET VALUES SUMMARY ............................................................................................... 25 4. DETAILED FUNCTIONAL DESCRIPTION .................................................................................................. 26 4.1. POWER ON RESET (POR) ...................................................................................................................... 26 4.2. POWER MANAGEMENT ......................................................................................................................... 26 4.3. CLOCK SOURCE ..................................................................................................................................... 26 4.4. INTERRUPT OUTPUT ............................................................................................................................. 27 4.4.1. SERVICING INTERRUPTS .............................................................................................................. 28 4.5. PERIODIC COUNTDOWN TIMER INTERRUPT FUNCTION ................................................................. 29 4.5.1. PERIODIC COUNTDOWN TIMER DIAGRAM.................................................................................. 29 4.5.2. USE OF THE PERIODIC COUNTDOWN TIMER ............................................................................. 30 4.5.3. FIRST PERIOD DURATION ............................................................................................................. 31 4.6. PERIODIC TIME UPDATE INTERRUPT FUNCTION ............................................................................. 32 4.6.1. PERIODIC TIME UPDATE DIAGRAM .............................................................................................. 32 4.6.2. USE OF THE PERIODIC TIME UPDATE INTERRUPT ................................................................... 33 4.7. ALARM INTERRUPT FUNCTION............................................................................................................ 34 4.7.1. ALARM DIAGRAM ............................................................................................................................ 34 4.7.2. USE OF THE ALARM INTERRUPT .................................................................................................. 35 4.8. EXTERNAL EVENT FUNCTION .............................................................................................................. 36 May 2019 2/74 Rev. 1.6