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RV5C386A Datasheet(PDF) 1 Page - RICOH electronics devices division

Part No. RV5C386A
Description  I2C bus SERIAL INTERFACE REAL-TIME CLOCK IC WITH VOLTAGE MONITORING FUNCTION
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Manufacturer  RICOH [RICOH electronics devices division]
Direct Link  http://www.ricoh.com
Logo RICOH - RICOH electronics devices division

RV5C386A Datasheet(HTML) 1 Page - RICOH electronics devices division

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1
I
2C bus SERIAL INTERFACE REAL-TIME CLOCK IC
WITH VOLTAGE MONITORING FUNCTION
RV5C386A
OUTLINE
The RV5C386A is a CMOS real-time clock IC connected to the CPU by two signal lines, SCL and 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 circuits generate interrupt signals at preset times. The oscillation circuit is driven under constant voltage so
that fluctuations in oscillation frequency due to voltage are small and supply current is also small (TYP. 0.35µA at 3
volts). 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-kHz clock output function (CMOS push-pull) is intended to
output sub-clock pulses for the external microcomputer. The 32-kHz clock circuit can be disabled by certain input
pin. The oscillation adjustment circuit is intended to adjust time counts with high precision by correcting deviations
in the oscillation frequency of the crystal oscillator. This model comes in an ultra-compact 10-pin SSOP-G (with a
height of 1.20mm and a pin pitch of 0.5mm).
FEATURES
• Timekeeping supply voltage ranging from 1.45 to 5.5 volts
• Low supply current: TYP. 0.35µA (MAX. 0.8µA) at 3 volts
• Only two signal lines (SCL, SDA) required for connection to the CPU.
(I
2C bus compatible, 400kHz at VDD
≥2.5V, address 7bits)
• Time counters (counting hours, minutes, and seconds) and calendar counters (counting years, months, days,
and weeks) (in BCD format)
• 1900/2000 identification bit for Year 2000 compliance
• 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 circuit
•2 alarm circuits (Alarm_W for week, hour, and minute alarm settings and Alarm_D for hour and minute
alarm settings)
• 32-kHz clock circuit (CMOS output, equipped with a control pin)
• Oscillation halt sensing circuit which can be used to judge the validity of internal data
• 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
• Built-in oscillation stabilization capacitors (CG and CD)
• High precision oscillation adjustment circuit
• CMOS process
• Ultra-compact 10-pin SSOP-G(with a height of 1.20mm and size 4.0mm
×2.9mm)
NO.EA-079-0208


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