R2061L03-E2 datasheet(1/60 Pages) RICOH

Part #	R2061L03-E2

Description	3 Wire Interface Real-Time Clock ICs with Battery Backup Switch-Over Function

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Manufacturer	RICOH [RICOH electronics devices division]

Direct Link	http://www.ricoh.com

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R2061x SERIES

3 Wire Interface Real-Time Clock ICs with Battery Backup Switch-Over Function

NO.EA-112-160701

1

* R2061K (FFP12) is the discontinued product as of July, 2016.

OUTLINE

The R2061x is a CMOS real-time clock IC connected to the CPU by three signal lines, CE, SCLK, and SIO, 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 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: R2061Sxx)

and QFN023023-16(2.3×2.3×0.4:R2061Lxx), high density mounting of ICs on boards is possible.

FEATURES

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

 Low power consumption

Typ. 0.4

A (Max. 1.0A) at VDD=3V

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

double layer capacitor)

 Three signal lines (CE, SCLK, and SIO) required for connection to the CPU.

(Maximum clock frequency of 1MHz (with VCC = 3V) )

 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

 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

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

 High precision oscillation adjustment circuit

 CMOS process

 Package SSOP16 (5.0mm x 6.4mm x 1.25mm : R2061Sxx)

FFP12(2.0mm x 2.0mm x 1.0mm :R2061Kxx)

QFN023023-16(2.3mm x 2.3mm x 0.4mm :R2061Lxx)

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