Micro Crystal

DTCXO Temperature Compensated Real Time Clock / Calendar Module

RV-3049

3/65

4.4. TIMER FUNCTION ................................................................................................................................... 29

4.4.1. TIMER INTERRUT ............................................................................................................................ 31

4.5. ALARM FUNCTION ................................................................................................................................. 32

4.5.1. ALARM INTERRUPT ........................................................................................................................ 33

4.6. INTERRUPT OUTPUT INT....................................................................................................................... 34

4.7. WATCH ENABLE FUNCTION ................................................................................................................. 35

4.8. SELF-RECOVERY SYSTEM ................................................................................................................... 35

4.9. CLOCK OUTPUT CLKOUT ..................................................................................................................... 36

5. COMPENSATION OF FREQUENCY DEVIATION AND FREQUENCY DRIFT vs TEMPERATURE ............ 37

5.1. TEMPERATURE CHARACTERISTICS TUNING FORK CRYSTAL....................................................... 37

5.2. COMPENSATION PRINCIPLE ................................................................................................................ 38

5.2.1. THERMOMETER AND TEMPERATURE VALUE ............................................................................ 39

5.2.2. SETTING THE FREQUENCY COMPENSATION PARAMETERS .................................................. 40

5.3. METHOD OF COMPENSATING THE FREQUENCY DEVIATION ......................................................... 41

5.3.1. CORRECT METHOD FOR TESTING THE TIME ACCURACY ....................................................... 42

5.3.2. TESTING THE TIME ACCURACY USING CLKOUT OUTPUT........................................................ 42

5.3.3. TESTING THE TIME ACCURACY USING INTERRUPT OUTPUT 1 Hz ......................................... 43

5.4. TIME ACCURACY OPT: A / OPT: B ....................................................................................................... 45

6. SPI INTERFACE .............................................................................................................................................. 47

6.1. SPI INTERFACE SYSTEM CONFIGURATION ....................................................................................... 47

6.2. SPI INTERFACE DATA TRANSMISSION............................................................................................... 49

6.2.1. COMMAND BYTE DEFINITION ....................................................................................................... 49

6.2.2. SPI INTERFACE READ / WRITE EXAMPLES ................................................................................. 50

7. ELECTRICAL CHRACTERISTICS .................................................................................................................. 52

7.1. ABSOLUTE MAXIMUM RATINGS .......................................................................................................... 52

7.2. FREQUENCY AND TIME CHARACTERISTICS ..................................................................................... 52

7.3. STATIC CHARACTERISTICS ................................................................................................................. 53

7.4. SPI INTERFACE TIMING CHARACTERISTICS ..................................................................................... 54

7.5. SPI INTERFACE DYNAMIC CHARACTERISTICS ................................................................................. 55

8. APPLICATION INFORMATION ....................................................................................................................... 56

8.1. RECOMMENDED REFLOW TEMPERATURE (LEADFREE SOLDERING) .......................................... 57

9. PACKAGES ..................................................................................................................................................... 58

9.1. DIMENSIONS AND SOLDERPADS LAYOUT ........................................................................................ 58

9.2. MARKING AND PIN #1 INDEX................................................................................................................ 59

10.PACKING INFORMATION............................................................................................................................... 60

10.1. CARRIER TAPE ....................................................................................................................................... 60

10.2. PARTS PER REEL................................................................................................................................... 61

10.3. REEL 13 INCH FOR 12 mm TAPE.......................................................................................................... 62

10.4. REEL 7 INCH FOR 12 mm TAPE............................................................................................................ 63