RV-3029 Datasheet, PDF (24/67 Pages) MICORO CRYSTAL SWITZERLAND – DTCXO Temperature Compensated Real Time Clock

Micro Crystal
DTCXO Temperature Compensated Real Time Clock / Calendar Module
RV-3029
Minimum Supply Voltage and Low Voltage Detection
V_DD
5.5 V
5.0 V
V_{DD max}
5.5 V
Supply
Voltage
Timekeeping
Function
Temperature
Compensation /
Thermometer
I²C Interface
Function
EEPROM
Function
4.0 V
3.0 V
V_{LOW 1}
2.0 V 2.1 V
V_{LOW 2}
1.0 V ^{1.3 V}
V_PROG
2.2 V
0V
At first power-up, the supply voltage has to exceed V_LOW1 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 V_LOW2 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 V_LOW2 threshold. The
Thermometer requires a supply voltage of ≥ V_LOW1 threshold. Supply voltages below V_LOW1 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 ≥ V_LOW1 threshold.
I²C interface:
The I²C interface operates with max. SCL clock rate down to a supply voltage of ≥ V_LOW1 threshold. Between
V_LOW1 and V_LOW2 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 ≥ V_LOW2 threshold.
EEPROM write cycle requires a minimum supply voltage of ≥ V_PROG of 2.2V.
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