RTC - 4543 SA/SB

32-kHz Output Serial RTC Module

RTC - 4543 SA/SB

zBuilt-in crystal permits operation without requiring adjustment

zBuilt-in time counters (seconds, minutes, hours) and calendar counters (days, days of the week months, years)

zOperating voltage range: 2.5 V to 5.5 V

zSupply voltage detection voltage: 1.7 ± 0.3 V

zLow current consumption: 1.0 ∝ A/2.0 V (Max.)

zAutomatic processing for leap years

zOutput selectable between 32.768 kHz/1 Hz

1. Overview

This module is a real-time clock with a serial interface and a built-in crystal oscillator. This module is also equipped with clock and calendar circuits, an automatic leap year compensation function, and a supply voltage detection function.

In addition, this module has a 32.768 kHz/1 Hz selectable output function for hardware control that is independent of the RTC circuit.

This module is available in a compact SOP 14-pin package (RTC-4543SA) and a thin SOP 18-pin package (RTC-4543SB).

2. Block diagram

32.768 kHz

 

OSC

DIVIDER

CLOCK AND CALENDAR

FOUT

OUTPUT

 

FSEL

 

CONTROLLER

SHIFT REGISTER

FOE

 

 

DATA

 

VOLTAGE

I / O

DETECT

CLK

 

CONTROLLER

CONTROL

WR

CE

 

CIRCUIT

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