ACE5372

Low Power Real-Time Clock (RTC)

VER 1.2

1 

Description

The ACE5372 is a CMOS type real-time clock, which is connected to the CPU via two wires and capable

of serial transmission of clock to the CPU. The ACE5372 can generate various periodic interrupt clock

pulses lasting for long period (one month), and alarm interrupt can be made 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 (TYP. 400nA @ 5V)

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

occasions. 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 from 32KHz or 32.768KHz types.

It adopts 8-pin SOP or TSSOP package.

Features

years, months, days, and days of the week) in BCD codes.

Packaging Type

SOP-8

TSSOP-8

Pin

Symbol

Definition

Value

In/Out

1

INTRB

Interrupt Output B

0~12V

Out

2

SCL

Serial Clock Line

0~5.5V

In

3

SDA

Serial Data Line

0~5.5V

In/Out

4

GND

Ground Power

0V

Power

5

INTRA

Interrupt Output A

0~12V

Out

6

OSCOUT Oscillator Circuit Output

0~1.5V

Out

7

OSCIN

Oscillator Circuit Input

0~1.5V

IN

8

VDD

Supply Voltage

1.8~5.5V Power

1

          8 

2

          7 

3

          6 

4

          5 

1

                8

2

                7 

3

                6 

4

                5