RV-3029 Datasheet, PDF (19/67 Pages) MICORO CRYSTAL SWITZERLAND – DTCXO Temperature Compensated Real Time Clock

Micro Crystal
DTCXO Temperature Compensated Real Time Clock / Calendar Module
RV-3029
3.8. EEPROM CONTROL PAGE REGISTER FUNCTION
The EEPROM Control Page contains 4 non-volatile EEPROM registers.
With Register EEPROM Control, the settings for Trickle-Charger (bit 7-4), the CLKOUT frequency (bit 3&2) and the
Thermometer (bit 1&0) can be controlled.
The registers XTAL Offset, XTAL Coef and XTAL T0 contain the factory calibrated, individual crystal parameters to
compensate the frequency deviation over the temperature range.
Please see section 4.3 EEPROM MEMORY ACCESS for detailed instructions how to handle EEPROM read / write
access.
3.8.1.EEPROM CONTROL (address 30h…bits description)
Address
30h
Function
EEPROM Control
Bit 7
R80k
Bit 6
R20k
Bit 5
R5k
Bit 4
R1k
Bit 3
FD1
Bit 2
FD0
Bit 1
ThE
Bit 0
ThP
Bit
Symbol
7
R80k
6
R20k
5
R5k
4
R1k
3
FD1
2
FD0
1
ThE
0
ThP
Value
0
1
0
1
0
1
0
1
00
01
10
11
0
1
0
1
Description
Disables 80 kΏ trickle charge resistor
Enables 80 kΏ trickle charge resistor
Disables 20 kΏ trickle charge resistor
Enables 20 kΏ trickle charge resistor
Disables 5 kΏ trickle charge resistor
Enables 5 kΏ trickle charge resistor
Disables 1.5 kΏ trickle charge resistor
Enables 1.5 kΏ trickle charge resistor
Selects Clock Frequency at CLKOUT pin
Disables Thermometer
Enables Thermometer
Set Temperature Scanning Interval:
Set Temperature Scanning Interval:
1 second
16 seconds
Reference
See section 4.1.
See section 4.9.
See section 5.2.1.
See section 5.2.1.
3.8.2.XTAL OFFSET (address 31h…bits description)
Address
31h
Bit
7
6 to 0
Function
XTAL Offset
Symbol
Sign
XTAL Offset¹⁾
Bit 7
sign
Bit 6
64
Bit 5
32
Bit 4
16
Bit 3
8
Bit 2
4
Value
0
1
0 to 121
Description
- Deviation (slower) of 32.768kHz frequency at T0
+ Deviation (faster) of 32.768kHz frequency at T0
Frequency Offset Compensation value
Bit 1
2
Bit 0
1
Reference
See section 5.2.2.
1) _{The XTAL Offset register value is factory programmed according to the crystal’s initial frequency-tolerance. For best time-accuracy, the}
content of this register must not be changed by the user.
3.8.3.XTAL TEMPERATUR COEFFICIENT (address 32h…bits description)
Address
32h
Bit
7 to 0
Function
XTAL Coef
Symbol
XTAL Coef¹⁾
Bit 7
128
Bit 6
64
Bit 5
32
Bit 4
16
Bit 3
8
Bit 2
4
Value
Description
0 to 255 Quadratic Coefficient of XTAL’s Temperature Drift
Bit 1
2
Bit 0
1
Reference
See section 5.2.2.
1) _{The XTAL Coef register value is factory programmed according to the crystal parameters over temperature. For best time-accuracy, the}
content of this register must not be changed by the user.
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