Datasheet > RS5C372B-E2

RS5C372B-E2

更新时间： 2024-02-17 23:31:24

品牌	Logo	应用领域
理光 - RICOH		时钟
页数	文件大小	规格书
39页	473K
描述
I2C-bus Serial Interface Real Time Clock (8pin SSOP)

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RS5C372B-E2 数据手册

Dec. 15 ’97

I²C-bus Serial Interface

Real Time Clock (8pin SSOP)

RS5C372B

■ OUTLINE

The RS5C372B is a CMOS type real-time clock which is connected to the CPU via 2-wire and capable of serial

transmission of clock and calendar data to the CPU. The RS5C372B 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 (0.5µA at 3V). It also

provides an oscillator halt sensing function applicable for data validation at power-on and other occasions and

32kHz clock output (CMOS output) for an external micro computer. 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 between 32.768kHz or

32.000kHz types. Integrated into an ultra compact and ultra thin 8 pin SSOP package, the RS5C372B is the

optimum choice for equipment requiring small sized and low power consuming products.

■ Features

● Time keeping voltage 1.45V to 6.0V

● Lowest supply current 0.5µA TYP (0.9µA MAX) at 3V(25°C)

(0.9µA MAX) at 3V(-40 to +85°C)

● Connected to the CPU via only 2-wire (I²C-bus interface, max.400KHz, address 7bits)

● A clock counter (hours, minutes, and seconds) and a calendar counter (leap years, years, months, days,

and days of the week) in BCD codes

● Interrupt to the CPU (period of one month to half second, with interrupt flag, interrupt halt function)

(/INTR)

● Two systems of alarm functions (days of the week, hours, and minutes) (/INTR)

● Oscillation halt sensing to judge internal data validity

● Clock output of 32.768kHz(32.000kHz) ( output controllable via a register)

(32KOUT:CMOS push-pull output)

● Second digit adjustment by ±30 seconds

● Automatic leap year recognition up to the year 2099

● 12-hour or 24-hour time display selectable

● Oscillation stabilizing capacity (CG, CD) incorporated

● High precision clock error adjustment circuit

● Oscillator of 32.768kHz or 32.000kHz may be used

● CMOS logic

● Package:8pin SSOP

*) I²C-bus is a trademark of PHILIPS ELECTRONICS N.V.

■ Block Diagram

ALARM_A REGISTER

COMPARATOR_A

(WEEK,MIN,HOUR)

32kHz OUTPUT

32KOUT

CONTROL

VDD

VSS

ALARM_B REGISTER

(WEEK,MIN,HOUR)

COMPARATOR_B

OSCIN

TIME COUNTER

(SEC,MIN,HOUR,WEEK,DAY,MONTH,YEAR)

DIVIDER

CORREC

-TION

DIV

OSC

OSCOUT

OSC

DETECT

ADDRESS

DECODER

ADDRESS

SCL

I/O

CONTROL

INTERRUPT CONTROL

SHIFT REGISTER

SDA

/INTR

- 1 -

12 3 4 5 6 7...39

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