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R2061K Datasheet

  • R2061K

  • real-time clock ICs

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  • ETC

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OUTLINE
鈥?2.10.18
3 wire interface Real-Time Clock ICs
with Battery Backup switch-over Function
R2061 Series
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. 0.4碌A(chǔ) 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 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脳2.0mm).
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FEATURES
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Minimum Timekeeping supply voltage Typ. 0.75V (Max. 1.00V); VDD pin
Low power consumption
0.4碌A(chǔ) TYP (1.0碌A(chǔ) MAX.) 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
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Built-in oscillation stabilization capacitors (CG and CD)
High precision oscillation adjustment circuit
CMOS process
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Ultra-compact FFP12
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PIN CONFIGURATION
R2061K(FFP12)
OSCOUT
8
OSCIN
/INTR
9
7
CIN
VSS
CE
10
11
12
1
2
3
6
5
4
VDD
VCC
VSB
SIO
TOP VIEW
/VDCC
SCLK
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Rev. 1.00
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