RV-3049 datasheet(19/65 Pages) MICROCRYSTAL

19 / 65 page

Micro Crystal

DTCXO Temperature Compensated Real Time Clock / Calendar Module

RV-3049

19/65

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

Function

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

30h

EEPROM Control

R80k

R20k

R5k

R1k

FD1

FD0

ThE

ThP

Bit

Symbol

Value

Description

Reference

R80k

Disables 80 kΏ trickle charge resistor

See section 4.1.

Enables 80 kΏ trickle charge resistor

R20k

Disables 20 kΏ trickle charge resistor

Enables 20 kΏ trickle charge resistor

R5k

Disables 5 kΏ trickle charge resistor

Enables 5 kΏ trickle charge resistor

R1k

Disables 1.5 kΏ trickle charge resistor

Enables 1.5 kΏ trickle charge resistor

FD1

Selects Clock Frequency at CLKOUT pin

See section 4.9.

FD0

ThE

Disables Thermometer

See section 5.2.1.

Enables Thermometer

ThP

Set Temperature Scanning Interval:

1 second

See section 5.2.1.

Set Temperature Scanning Interval:

16 seconds

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

Address

Function

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

31h

XTAL Offset

sign

Bit

Symbol

Value

Description

Reference

Sign

- Deviation (slower) of 32.768kHz frequency at T0

See section 5.2.2.

+ Deviation (faster) of 32.768kHz frequency at T0

6 to 0

XTAL Offset

0 to 121

Frequency Offset Compensation value

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

Function

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

32h

XTAL Coef

128

Bit

Symbol

Value

Description

Reference

7 to 0

XTAL Coef

0 to 255

Quadratic Coefficient of XTAL’s Temperature Drift

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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