RV-3049 datasheet(8/65 Pages) MICROCRYSTAL

8 / 65 page

Micro Crystal

DTCXO Temperature Compensated Real Time Clock / Calendar Module

RV-3049

8/65

2.2. PIN DESCRIPTION

Symbol

Pin #

Description

VDD

Positive supply voltage; positive or negative steps in supply voltage may affect oscillator

performance, recommend 10 nF decoupling capacitor close to device

CLKOUT

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

Chip Enable Input pin; active HIGH

SCL

Serial Clock Input pin; may float when CE inactive

SDO

Serial Data Output pin; push-pull; high impedance when not driving; can be connected to SDI for

single wire data line

VSS

Ground

INT

Interrupt Output pin; open-drain; active LOW

VBACKUP

Backup Supply Voltage; tie to GND when not using backup supply voltage

SDI

Serial Data Input pin; may float when CE inactive

CLKOE

CLKOUT enable/disable pin; enable is active HIGH; tie to GND when not using CLKOUT

2.3. FUNCTIONAL DESCRIPTION

The RV-3049 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-3049 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 SPI 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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