BOB-14558 SparkFun

RV-1805-C3 Application Manual Date: January 2015 Revision N: 2.1 1/99 Headquarters: Micro Crystal AG Tel. +41 32 655 82 82 Mhlestrasse 14 Fax +41 32 655 82 83 CH-2540 Grenchen Internet www.microcrystal.com Switzerland Email sales microcrystal.com Micro Crystal Extrem Low Power Real Time Clock / Calendar Module RV-1805-C3 TABLE OF CONTENTS 1. OVERVIEW ........................................................................................................................................................ 6 1.1. GENERAL DESCRIPTION ......................................................................................................................... 6 1.2. APPLICATIONS ......................................................................................................................................... 7 2. BLOCK DIAGRAM ............................................................................................................................................. 8 2.1. PINOUT ...................................................................................................................................................... 9 2.2. PIN DESCRIPTION .................................................................................................................................. 10 2.3. FUNCTIONAL DESCRIPTION ................................................................................................................. 11 2.4. DEVICE PROTECTION DIAGRAM ......................................................................................................... 11 3. REGISTER ORGANIZATION .......................................................................................................................... 12 3.1. REGISTER OVERVIEW ........................................................................................................................... 12 3.2. TIME AND DATE REGISTERS ................................................................................................................ 14 3.3. ALARM REGISTERS ............................................................................................................................... 17 3.4. CONFIGURATION REGISTERS.............................................................................................................. 20 3.5. CALIBRATION REGISTERS ................................................................................................................... 25 3.6. SLEEP CONTROL REGISTER ................................................................................................................ 27 3.7. TIMER REGISTERS ................................................................................................................................. 28 3.8. OSCILLATOR REGISTERS..................................................................................................................... 31 3.9. MISCELLANEOUS REGISTERS ............................................................................................................. 32 3.10. ANALOG CONTROL REGISTERS ......................................................................................................... 33 3.11. ID REGISTERS ........................................................................................................................................ 35 3.12. RAM REGISTERS .................................................................................................................................... 37 3.13. REGISTER RESET VALUES SUMMARY ............................................................................................... 39 4. DETAILED FUNCTIONAL DESCRIPTION ..................................................................................................... 40 2 4.2. I C INTERFACE ....................................................................................................................................... 41 4.2.1. BUS NOT BUSY ................................................................................................................................ 41 4.2.2. BIT TRANSFER ................................................................................................................................ 41 4.2.3. START AND STOP CONDITIONS ................................................................................................... 41 4.2.4. DATA VALID ..................................................................................................................................... 42 4.2.5. SYSTEM CONFIGURATION ............................................................................................................ 42 4.2.6. ACKNOWLEDGE .............................................................................................................................. 42 4.2.7. ADDRESSING ................................................................................................................................... 43 4.2.8. WRITE OPERATION ......................................................................................................................... 44 4.2.9. READ OPERATION AT SPECIFIC ADDRESS ................................................................................ 44 4.2.10. READ OPERATION .......................................................................................................................... 45 4.3. XT OSCILLATOR ..................................................................................................................................... 45 4.4. RC OSCILLATOR .................................................................................................................................... 45 4.5. RTC COUNTER ACCESS ........................................................................................................................ 45 4.6. HUNDREDTHS SYNCHRONIZATION .................................................................................................... 46 2/99