RV-4162 Datasheet, PDF (2/39 Pages) MICORO CRYSTAL SWITZERLAND – Ultra Small Real Time Clock

Micro Crystal
Ultra Small Real Time Clock / Calendar Module
RV-4162
TABLE OF CONTENTS
1. OVERVIEW ........................................................................................................................................................ 4
1.1. GENERAL DESCRIPTION......................................................................................................................... 4
1.2. APPLICATIONS ......................................................................................................................................... 4
2. BLOCK DIAGRAM ............................................................................................................................................. 5
2.1. PINOUT ...................................................................................................................................................... 6
2.2. PIN DESCRIPTION .................................................................................................................................... 6
2.3. FUNCTIONAL DESCRIPTION................................................................................................................... 6
2.4. DEVICE PROTECTION DIAGRAM ........................................................................................................... 7
3. REGISTER ORGANIZATION ............................................................................................................................ 8
3.1. REGISTER ACCESS ................................................................................................................................. 8
3.2. BUFFER / TRANSFER REGISTERS......................................................................................................... 9
3.3. REGISTER OVERVIEW ........................................................................................................................... 10
3.4. CLOCK SECTION .................................................................................................................................... 11
3.5. CONTROL SECTION ............................................................................................................................... 13
3.6. DATA FLOW OF TIME AND DATE FUNCTION ..................................................................................... 15
3.7. REGISTER RESET VALUE ..................................................................................................................... 15
4. DETAILED FUNCTIONAL DESCRIPTION ..................................................................................................... 16
4.1. CLKOUT FREQUENCY SELECTION ..................................................................................................... 16
4.2. FREQUENCY OFFSET COMPENSATION ............................................................................................. 17
4.2.1. FREQUENCY OFFSET COMPENSATION METHOD ..................................................................... 18
4.2.2. DEFINING FREQUENCY COMPENSATION VALUE ...................................................................... 19
4.3. WATCHDOG TIMER ................................................................................................................................ 20
4.4. ALARM FUNCTION ................................................................................................................................. 21
4.5. CENTURY BITS ....................................................................................................................................... 22
4.6. LEAP YEAR ............................................................................................................................................. 22
4.7. OSCILLATOR STOP DETECTION.......................................................................................................... 23
4.8. OUTPUT DRIVER PIN ............................................................................................................................. 23
5. CHARACTERISTICS OF THE I²C BUS .......................................................................................................... 24
5.1. BIT TRANSFER ....................................................................................................................................... 24
5.2. START AND STOP CONDITIONS .......................................................................................................... 24
5.3. SYSTEM CONFIGURATION.................................................................................................................... 25
5.4. ACKNOWLEDGE ..................................................................................................................................... 25
6. I²C BUS PROTOCOL....................................................................................................................................... 26
6.1. ADDRESSING .......................................................................................................................................... 26
6.2. CLOCK AND CALENDAR READ AND WRITE CYCLES ...................................................................... 26
6.2.1. WRITE MODE ................................................................................................................................... 26
6.2.2. READ MODE AT SPECIFIC ADDRESS........................................................................................... 27
6.2.3. READ MODE..................................................................................................................................... 27
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