R2043K/T Series Specifications
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The R2043K/T is a CMOS real-time clock IC connected to the CPU by four signal lines,
CE, SCLK, SI, SO, 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. 0.45 µA 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 (N-channel open drain 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 crystal oscillator.
Since the package for these ICs are TSSOP10G (4.0x2.9x1.0:R2043T)
or FFP12 (2.0x2.0x1.0:
R2043K), high density mounting of ICs on boards is possible.
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 Minimum
Timekeeping supply voltage |
TYP:0.66 to 5.5v (Worst: 1.00V to 5.5v); VDD pin |
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| Low
power consumption |
0.45 ľA TYP at VDD=3V (1.00ľA MAX.) |
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| four
signal lines (CE, SCLK, SI, and SO) 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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Power-on flag to prove that the power supply starts from 0V |
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| 32-kHz
clock output pin (Nch open drain output) |
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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 |
FFP12 (2.0mm
x 2.0mm x 1.0mm: R2043K)
TSSOP10G (4.0mm x 2.9mm x 1.0mm: R2043T ) |
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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)
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Product Catalog
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| Selection guide is available for download in PDF format. |
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