RV-3049 datasheet(24/65 Pages) MICROCRYSTAL

24 / 65 page

Micro Crystal

DTCXO Temperature Compensated Real Time Clock / Calendar Module

RV-3049

24/65

Minimum Supply Voltage and Low Voltage Detection

VDD

VLOW 2

1.3 V

VLOW 1

2.1 V

0 V

1.0 V

2.0 V

3.0 V

4.0 V

5.0 V

5.5 V

VDD max

5.5 V

Supply

Voltage

VPROG

2.2 V

Timekeeping

Function

SPI Interface

Function

Temperature

Compensation /

Thermometer

EEPROM

Function

At first power-up, the supply voltage has to exceed VLOW1 threshold to enable and correctly setup all function of

the device.

Timekeeping Function:

Keeping track of Time & Date depends on the 32.768kHz oscillator operates safely over the specified

temperature range. Timekeeping function is guaranteed for a supply voltage down to VLOW2 threshold, below this

voltage the 32.768kHz oscillator may stop and the time & date information might be corrupted.

Temperature Compensation:

The Frequency Compensation Unit “FCU” operates with supply voltages down to VLOW2 threshold. The

Thermometer requires a supply voltage of ≥ VLOW1 threshold. Supply voltages below VLOW1 threshold will

automatically disable the Thermometer; the last correct temperature reading is frozen in the register

“Temperature”. The Frequency Compensation Unit continues to operate with the last temperature-reading down

to a supply voltage ≥ VLOW1 threshold.

SPI interface:

The SPI interface operates with max. SCL clock rate down to a supply voltage of ≥ VLOW1 threshold. Between

VLOW1 and VLOW2 threshold, the interface still operates at reduced SCL clock rate.

EEPROM read / write access:

EEPROM read access is possible down to a supply voltage of ≥ VLOW2 threshold.

EEPROM write cycle requires a minimum supply voltage of ≥ VPROG of 2.2V.

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