R2051K02 RICOH Co.,Ltd., R2051K02 Datasheet

R2051K02

Manufacturer Part Number

R2051K02

Description

Manufacturer

RICOH Co.,Ltd.

Datasheet

1.R2051K02.pdf (52 pages)

Specifications of R2051K02

Date_code

05+

Packing_info

2520

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Rev.1.01

The R2051 is a CMOS real-time clock IC connected to the CPU by two signal lines, SCL and SDA, and configured

to perform serial transmission of time and calendar data to the CPU. Further, battery backup switchover circuit and

a voltage detector. The periodic interrupt circuit is configured to generate interrupt signals with six selectable

interrupts ranging from 0.5 seconds to 1 month. The 2 alarm interrupt circuits generate interrupt signals at preset

times. As the oscillation circuit is driven under constant voltage, fluctuation of the oscillator frequency due to supply

voltage is small, and the time keeping current is small (TYP. 0.4 A at 3V). The oscillation halt sensing circuit can

be used to judge the validity of internal data in such events as power-on; The supply voltage monitoring circuit is

configured to record a drop in supply voltage below two selectable supply voltage monitoring threshold settings. The

32-kHz clock output function (CMOS output) is intended to output sub-clock pulses for the external microcomputer.

The oscillation adjustment circuit is intended to adjust time counts with high precision by correcting deviations in

the oscillation frequency of the crystal oscillator. Battery backup switchover function is the automatic switchover

circuit between a main power supply and a backup battery of primary or secondary battery. Switchover is executed

by monitoring the voltage of a main power supply, therefore the voltage of a backup battery voltage is not relevant.

This model comes in an ultra-compact FFP12 (Height 0.85mm, 2.0mm 2.0mm).

OUTLINE

FEATURES

PIN CONFIGURATION

Minimum Timekeeping supply voltage Typ. 0.75V (Max. 1.00V); VDD pin

Low power consumption

Built-in Backup switchover circuit (can be used for a primary battery, a secondary battery, or an electric double

layer capacitor)

Only two signal lines (SCL and SDA) required for connection to the CPU.

Time counters (counting hours, minutes, and seconds) and calendar counters (counting years, months, days,

and weeks) (in BCD format)

Interrupt circuit configured to generate interrupt signals (with interrupts ranging from 0.5 seconds to 1 month) to

the CPU and provided with an interrupt flag and an interrupt halt

2 alarm interrupt circuits (Alarm_W for week, hour, and minute alarm settings and Alarm_D for hour and minute

alarm settings)

Built-in voltage detector with delay

With Power-on flag to prove that the power supply starts from 0V

32-kHz clock output pin (CMOS output. “H” level is always equal to VCC.)

Supply voltage monitoring circuit with two supply voltage monitoring threshold settings

Automatic identification of leap years up to the year 2099

Selectable 12-hour and 24-hour mode settings

High precision oscillation adjustment circuit

CMOS process

( I

C-Bus Interface, 400kHz)

0.4 A TYP (1.0 A MAX.) at VDD=3V

/VDCC

CIN

VSS

R2051K(FFP12)

TOP VIEW

- 1 -

R2051 Series

l Built-in oscillation stabilization capacitors (CG and CD)

l Ultra-compact FFP12

with Battery Backup switch-over Function

C-Bus Real-Time Clock ICs

VDD

VCC

VSB

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’02.09.25

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