| The RS5C372A is a CMOS type real-time clock which is connected to the CPU via 2-wires
and capable of serial transmission of clock and calendar data to the CPU.
The RS5C372A can generate various periodic interrupt clock pulses lasting for long
period (one month), and alarm interrupt can be made by days of the week, hours, and minutes by two incorporated
systems. Since an oscillation circuit is driven at a constant voltage, it undergoes fluctuations of few
voltage and consequently offers low current consumption (TYP. 0.5µA at 3V). It also provides an oscillator
halt sensing function applicable for data validation at power-on and other occasions and 32-kHz clock output
for an external micro computer. (Nch. open drain output) The product also incorporates a time trimming
circuit that adjusts the clock with higher precision by adjusting any errors in crystal oscillator frequencies
based on signals from the CPU. The crystal oscillator may be selected from 32.768kHz or 32.000kHz types.
Integrated into an ultra compact and ultra thin 8
pin SSOP package, the RS5C372A is the optimum choice for equipment requiring
small sized and low power consuming products.
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 Time
keeping voltage |
1.3V to 6.0V |
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| Lowest
supply current |
0.5µA TYP.
(0.9µA MAX.) : 3V (25°C)
(1.0µA MAX.) : 3V (-40 to +85°C) |
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Connected
to the CPU via only 2-wires (I2C bus Interface, MAX.400kHz, address 7bit) |
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| A
clock counter (counting hours, minutes, and seconds) and a calendar counter (counting leap years, years, months,
days, and days of the week) in BCD codes |
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| Interrupt
to the CPU (period of one month to one second, interrupt flag, interrupt halt function) (INTRA, INTRB) |
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| Two
systems of alarm functions (days of the week, hours, and minutes) (INTRA, INTRB) |
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| Oscillation
halt sensing to judge internal data validity |
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Clock
output of 32.768kHz(32.000kHz)
(output controllable via a register) |
(Nch. open drain output) |
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| Second
digit adjustment by ±30 seconds |
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| Automatic
leap year recognition up to the year 2099 |
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| 12-hour
or 24-hour time display selectable |
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| Oscillation
stabilizing capacity (CG, CD) incorporated |
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| High
precision time trimming circuit |
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| Oscillator
of 32.768kHz or 32.000kHz may be used |
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| CMOS
logic |
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| Package |
8pin
SSOP |
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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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