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RV5C387A
2-wire (I2C Bus) Serial Interface Real Time Clock (RTC)

Product Specifications

The RV5C387A is a CMOS real-time clock IC connected to the CPU by two signal, 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 for the RV5C387A 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 (Nch. open drain) 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. The 32-kHz clock circuit can be disabled by certain register settings. This model comes in a 10-pin SSOP-G.

FEATURES

Minimum Timekeeping supply voltage 1.45 V to 5.5 V
Supply Current TYP. 0.35 µA (VDD = 3V)
Connected to the CPU Two signal lines (SCL, SDA), I2C bus compatible, 400 kHz at VDD≥2.5V, address 7bits
Functions Time counters (counting hours, minutes, and seconds) and calendar counters (counting years, months, days, and weeks) (in BCD format)
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)
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
Clock Output 32-kHz (Nch. open drain output)
Built-in Circuits Oscillation stabilization capacitors (CG and CD)
High precision oscillation adjustment
Packages SSOP10G

PIN DESCRIPTION

SSOP10G

SSOP10G2.9 mm × 4.0 mm
1 32KOUT
2 SCL
3 SDA
4 INTRC
5 VSS
6 INTRA
7 INTRB
8 OSCOUT
9 OSCIN
10 VDD

RV5C387A for Consumer

APPLICATIONS

  • Home appliances such as refrigerators, rice cookers, and electric pots
  • Digital appliances such as laptops, digital TVs, DSCs, camcorders, mobile phones, and private LAN system
  • Office appliances such as copiers, printers, facsimiles, scanners, and projectors

SELECTION GUIDE

Product Name   Package Quantity per Reel
RV5C387A-E2-F Consumter SSOP10G 2,000

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Package *1 Reliability *2
SSOP10G RV5C387A

*1: The package file includes package dimensions, taping specifications, taping reels dimensions.
*2: Reliability file includes a reliability test report and a reflow profile.

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