3 wire interface Real-Time Clock ICs with Battery Backup switch-over Function
The R2061 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. 0.4µA
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 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 FFP12 (2.0x2.0x1.0: R2061Kxx), high density mounting of ICs on boards is possible. |
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Minimum
Timekeeping supply voltage |
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Typ. 0.75V (Max. 1.00V); VDD pin |
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| Low
power consumption |
0.4µA TYP (1.0µA MAX.) at VDD=3V |
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Built-in
Backup switchover circuit (can be used for a primary battery, a secondary battery, or an electric double layer
capacitor) |
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Three
signal lines (CE, SCLK, and SIO) required for connection to the CPU.(Maximum clock frequency of 1MHz (with
VCC = 3V)) |
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Time
counters (counting hours, minutes, and seconds) and calendar counters (counting years, months, days,and weeks)
(in BCD format) |
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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 |
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2
alarm interrupt circuits (Alarm_W for week, hour, and minute alarm settings and Alarm_D for hour and minute
alarm settings) |
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| Built-in
voltage detector with delay |
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Power-on flag to prove that the power supply starts from 0V |
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Supply
voltage monitoring circuit with two supply voltage monitoring threshold settings |
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| Automatic
identification of leap years up to the year 2099 |
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| Selectable
12-hour and 24-hour mode settings |
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| Built-in
oscillation stabilization capacitors (CG and CD) |
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| High
precision oscillation adjustment circuit |
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| CMOS
process |
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| Package |
SSOP16 (5.0mm
x 6.4mm x 1.25mm : R2061Sxx)
FFP12 (2.0mm
x 2.0mm x 1.0mm : R2061Kxx) |
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Communication devices(multi function phone, portable phone, PHS
or pager) |
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OA devices(fax, portable fax)
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Computer(desk-top and mobile PC, portable word-processor, PDA, electric note
or video game) |
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AV components (portable audio unit, video camera, camera, digital camera or remote
controller) |
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Home appliances(rice cooker, electric oven) |
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Other(car navigation system, multi-function watch) |
Data Sheet
(PDF) |
Package Info.
(PDF) |
Mark Info.
(PDF) |
Quality Assurance Data
(PDF) |
 R2061S/K
EA-112-070427 (730KB) |
SSOP-16 |
to be prepared |
to be prepared |
to be prepared |
| FFP-12 |
to be prepared |
Reliability |
to be prepared |
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| * All PDF files are less than 1MB unless otherwise stated. |
| * If you don't have Adobe Reader, you can download free. |
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Product Catalog
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| Selection guide is available for download in PDF format. |
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