2-wire Serial Interface Real Time Clock IC
| The R2023K/T is a CMOS real-time clock IC connected to the CPU by two signal lines,
SCL, SDA, and configured
to perform serial transmission of time and calendar data to the CPU. 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. 0.45µA 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
with control pin) 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.
Since
the package for these ICs are TSSOP10G (4.0x2.9x1.0:
R2023T) or FFP12 (2.0x2.0x1.0:
R2023K), high density mounting of ICs on boards is possible. |
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Minimum
Timekeeping supply voltage |
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TYP:0.66 to 5.5v (Worst: 1.00V to 5.5v); VDD pin |
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| Low
power consumption |
0.45µA TYP at VDD=3V (1.00µA MAX.) |
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Two
signal lines (SCL, SDA) required for connection to the CPU. |
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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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With
Power-on flag to prove that the power supply starts from 0V |
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32-kHz
clock output pin (CMOS push-pull output with control pin) |
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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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| High
precision oscillation adjustment circuit |
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| Built-in
oscillation stabilization capacitors (CG and CD) |
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| Package |
TSSOP10G (4.0mm
x 2.9mm x 1.0mm: R2023T)
FFP12 (2.0mm
x 2.0mm x 1.0mm: R2023K) |
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| CMOS
process |
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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) |
| * 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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R2023K/T
