RS5C372B RICOH Co.,Ltd., RS5C372B Datasheet

RS5C372B

Manufacturer Part Number

RS5C372B

Description

TSSOP8

Manufacturer

RICOH Co.,Ltd.

Datasheets

1.RS5C372B.pdf (59 pages)

2.RS5C372B.pdf (59 pages)

3.RS5C372B.pdf (39 pages)

Specifications of RS5C372B

Date_code

05+

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RS5C372B

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.

Block Diagram

OUTLINE

Features

32KOUT

OSCIN

OSCOUT

and days of the week) in BCD codes

(/INTR)

(32KOUT:CMOS push-pull output)

*) I

/INTR

Time keeping voltage 1.45V to 6.0V

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

Connected to the CPU via only 2-wire (I

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

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

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)

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

C-bus is a trademark of PHILIPS ELECTRONICS N.V.

OSC

DETECT

OSC

32kHz OUTPUT

CONTROL

CORREC

DIVIDER

-TION

INTERRUPT CONTROL

(0.9µA MAX) at 3V(-40 to +85 C)

DIV

COMPARATOR_A

COMPARATOR_B

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

DECODER

ADDRESS

C-bus interface, max.400KHz, address 7bits)

- 1 -

Real Time Clock (8pin SSOP)

TIME COUNTER

SHIFT REGISTER

C-bus Serial Interface

ALARM_A REGISTER

ALARM_B REGISTER

ADDRESS

(WEEK,MIN,HOUR)

CONTROL

I/O

Dec. 15 ’97

VDD

VSS

SCL

SDA

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