RV-3029 Datasheet, PDF (8/67 Pages) MICORO CRYSTAL SWITZERLAND – DTCXO Temperature Compensated Real Time Clock

Micro Crystal
DTCXO Temperature Compensated Real Time Clock / Calendar Module
RV-3029
2.2. PIN DESCRIPTION
Symbol
VDD
Pin #
C2
C3
1
2
CLKOUT
N.C.
SCL
SDA
VSS
INT
VBACKUP
N.C.
CLKOE
2
3
3
8
4
4
5
5
6
6
7
7
8
9
9
10
10
1
Description
Positive supply voltage; positive or negative steps in supply voltage may affect oscillator
performance, recommend 10 nF decoupling capacitor close to device
Clock Output pin; CLKOUT or INT function can be selected.(Control_1; bit7; Clk/Int)
CLKOUT output push-pull / INT function open-drain requiring pull-up resistor
Not Connected; internally used for test, do not connect other signals than ground
Serial Clock Input pin; requires pull-up resistor
Serial Data Input-Output pin; open-drain; requires pull-up resistor
Ground
Interrupt Output pin; open-drain; active LOW
Backup Supply Voltage; tie to GND when not using backup supply voltage
Not Connected; internally used for test, do not connect other signals than ground
CLKOUT enable/disable pin; enable is active HIGH; tie to GND when not using CLKOUT
2.3. FUNCTIONAL DESCRIPTION
The RV-3029 is a highly accurate real-time clock/calendar module due to integrated temperature compensation
circuitry. The built-in Thermometer and Digital Temperature Compensation circuitry (DTCXO) provides improved
time-accuracy; achieved by measuring the temperature and calculating an expected correction value based on
precise, factory-calibrated Crystal parameters. The compensation of the frequency deviation @ 25°C and the
Crystal’s frequency-drift over the temperature range are obtained by adding or subtracting 32.768 kHz oscillator
clock-pulses. Beyond standard RTC-functions like year, month, day, weekday, hours, minutes, seconds
information, the RV-3029 offers highly versatile Alarm and Timer-Interrupt function, programmable Clock-Output
and Voltage-Low-Detector and a Main-Supply to Backup-Battery Switchover Circuitry and a 400 kHz I²C interface.
The CMOS IC contains thirty 8-bit RAM registers organized in 6 memory pages; the address counter is
automatically incremented within the same memory page. All sixteen registers are designed as addressable 8-bit
parallel registers, although, not all bits are implemented.
• Memory page #00 contains of five registers (memory address 00h and 04h) used as control registers
• Memory page #01 addresses 08h through 0Eh are used as counters for the clock function (seconds up to
years). The Seconds, Minutes, Hours, Days, Weekdays, Months and Years registers
are all coded in Binary-Coded-Decimal (BCD) format. When one of the RTC registers is
read, the content of all counters is frozen to prevent faulty reading of the clock/calendar
registers during a carry condition
• Memory page #02 addresses 10h through 16h define the alarm condition
• Memory page #03 addresses 18h and 19h are used for Timer function
• Memory page #04 address 20h provides the thermometer reading value
• Memory page #07 addresses 38h through 3Fh are available for user data
Additionally, the CMOS-IC contains six non-volatile 8-bit EEPROM registers organized in 2 memory pages; the
address counter is automatically incremented within the same memory page.
• EEPROM page #05 addresses 28h and 29h are available for EEPROM user data
• EEPROM page #06 contains of four registers (memory address 30h through 33h) used as non-volatile
control registers. These registers contain the factory programmed parameters of the
Crystal’s thermal characteristics, the frequency-deviation @ ambient temperature and
the Thermometer’s calibration values. In favour for the best time-accuracy, the factory
programmed registers (memory address 31h through 33h) shall not be changed by
the user without carefully studying its function
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