3 wire interface Real-Time Clock ICs
The R2033K/T is a CMOS real-time clock IC connected to the CPU by three signal lines,
CE, SCLK, SIO, 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: R2033T) or FFP12 (2.0x2.0x1.0: R2033K), 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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Three
signal lines (CE, SCLK, and SIO) required for connection to the CPU.(Maximum clock frequency of 1MHz (with
VDD = 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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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 (4.0x2.9x1.0:
R2033T),
FFP12 (2.0x2.0x1.0:
R2033K) |
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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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R2033K/T
