ACE5372
Low Power Real-Time Clock (RTC)
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.
Features
Lowest supply current: 400nA Typ.@5V
Connected to the CPU via only 2-wires (MAX. 100KHz)
A clock counter (counting hours. Minutes. and seconds) and a calendar counter (counting leap years,
years, months, days, and days of the week) in BCD codes.
Two system output of alarm functions
Oscillation halt sensing to judge internal data validity
Clock output of 32.768KHz (32KHz) (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
High precision time trimming circuit
Oscillator of 32.768KHz or 32KHz may be used
CMOS logic
Packaging Type
SOP-8
1
2
3
4
8
7
6
5
1
2
3
4
TSSOP-8
8
7
6
5
SOP-8 / TSSOP-8 Description
1
2
3
4
5
6
7
8
INTRB
SCL
SDA
GND
INTRA
OSCOUT
OSCIN
VDD
Function
Interrupt Output B
Serial Clock Line
Serial Data Line
Ground Power
Interrupt Output A
Oscillator Circuit Output
Oscillator Circuit Input
Supply Voltage
Value
0~12V
0~5.5V
0~5.5V
0V
0~12V
0~1.5V
0~1.5V
1.8~5.5V
In/Out
Out
In
In/Out
Power
Out
Out
IN
Power
VER 1.3
1
ACE [ ACE TECHNOLOGY CO., LTD. ]
