Micro Crystal

DTCXO Temperature Compensated Real Time Clock / Calendar Module

RV-3049

2/65

TABLE OF CONTENTS

1. OVERVIEW ........................................................................................................................................................ 5

1.1. GENERAL DESCRIPTION......................................................................................................................... 5

1.2. APPLICATIONS ......................................................................................................................................... 5

2. BLOCK DIAGRAM............................................................................................................................................. 6

2.1. PINOUT ...................................................................................................................................................... 7

2.2. PIN DESCRIPTION .................................................................................................................................... 8

2.3. FUNCTIONAL DESCRIPTION................................................................................................................... 8

2.4. DEVICE PROTECTION DIAGRAM ........................................................................................................... 9

3. REGISTER ORGANIZATION .......................................................................................................................... 10

3.1. REGISTER OVERVIEW ........................................................................................................................... 10

3.2. CONTROL PAGE REGISTER FUNCTION.............................................................................................. 11

3.2.1. CONTROL_1 (address 00h…bits description).................................................................................. 11

3.2.2. CONTROL_INT (address 01h…bits description) .............................................................................. 11

3.2.3. CONTROL_INT FLAG (address 02h…bits description) ................................................................... 12

3.2.4. CONTROL_STATUS (address 03h…bits description) ..................................................................... 12

3.2.5. CONTROL_RESET (address 04h…bits description)........................................................................ 13

3.3. WATCH PAGE REGISTER FUNCTION .................................................................................................. 13

3.3.1. SECONDS, MINUTES, HOURS, DAYS, WEEKDAYS, MONTHS, YEARS REGISTER ................. 13

3.3.2. DATA FLOW OF TIME AND DATE FUNCTION............................................................................... 15

3.4. ALARM PAGE REGISTER FUNCTION .................................................................................................. 16

3.4.1. SECONDS, MINUTES, HOURS, DAYS, WEEKDAYS, MONTHS, YEARS ALARM REGISTER.... 16

3.5. TIMER PAGE REGISTER FUNCTION .................................................................................................... 18

3.6. TEMPERATURE PAGE REGISTER FUNCTION .................................................................................... 18

3.7. EEPROM DATA PAGE REGISTER FUNCTION..................................................................................... 18

3.8. EEPROM CONTROL PAGE REGISTER FUNCTION ............................................................................. 19

3.8.1. EEPROM CONTROL (address 30h…bits description) ..................................................................... 19

3.8.2. XTAL OFFSET (address 31h…bits description) ............................................................................... 19

3.8.3. XTAL TEMPERATUR COEFFICIENT (address 32h…bits description) ........................................... 19

3.8.4. XTAL TURNOVER TEMPERATUR COEFFICIENT T0 (address 33h…bits description)................. 20

3.9. RAM DATA PAGE REGISTER FUNCTION ............................................................................................ 20

4. DETAILED FUNCTIONAL DESCRIPTION ..................................................................................................... 21

4.1. POWER-UP, POWER MANAGEMENT AND BATTERY SWITCHOVER .............................................. 21

4.1.1. POWER UP SEQUENCE ................................................................................................................. 22

4.1.2. SUPPLY VOLTAGE OPERATING RANGE AND LOW VOLTAGE DETECTION ............................ 23

4.2. RESET ...................................................................................................................................................... 25

4.2.1. POWER-UP RESET, SYSTEM RESET AND SELF-RECOVERY RESET ...................................... 25

4.2.2. REGISTER RESET VALUES............................................................................................................ 26

4.3. EEPROM MEMORY ACCESS ................................................................................................................. 28