R2051K02E2 RICOH Co.,Ltd., R2051K02E2 Datasheet

R2051K02E2

Manufacturer Part Number

R2051K02E2

Description

QFN

Manufacturer

RICOH Co.,Ltd.

Datasheet

1.R2051K02E2.pdf (58 pages)

Specifications of R2051K02E2

Date_code

04+

Current page: 1 of 58
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OUTLINE

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

circuit and a voltage detector are incorporated. 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. 0.4µA 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 32.768kHz 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 quartz crystal unit. 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. Since the package for these ICs is SSOP16 (5.0x6.4x1.25:

R2051Sxx), FFP12 (2.0x2.0x1.0: R2051Kxx), or TSSOP10G (4.0x2.9x1.0: R2051Txx), high density mounting of

ICs on boards is possible.

FEATURES

•

2 wire interface Real-Time Clock ICs with Battery Backup switch-over Function

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

layer capacitor)

and weeks) (in BCD format)

to the CPU and provided with an interrupt flag and an interrupt halt (except R2051Txx)

minute alarm settings) (except R2051Txx)

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

Low power consumption 0.4µA TYP (1.0µA MAX.) at V

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

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

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

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

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

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

Built-in oscillation stabilization capacitors (CG and CD)

CMOS process

Package SSOP16 (5.0mm x 6.4mm x 1.25mm : R2051Sxx), FFP12 (2.0mm x 2.0mm x 1.0mm : R2051Kxx)

TSSOP10G (4.0x2.9x1.0: R2051Txx)

=3V

R2051 SERIES

C-Bus Interface, 400kHz)

NO.EA-104-070626

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