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PDF ACE5372 Data sheet ( Hoja de datos )
| Número de pieza | ACE5372 | |
| Descripción | Low Power Real-Time Clock | |
| Fabricantes | ACE Technology | |
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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
TSSOP-8
1
2
3
4
8
7
6
5
SOP-8 / TSSOP-8 Description
Function
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
VER 1.4 1
1 page  
ACE5372
Low Power Real-Time Clock (RTC)
Alarm function and Periodic Interrupt
Alarm Function:
The ACE5372 has an alarm function that outputs an interrupt signal from INTRA or INTRB output pins
to the CPU when the day of the week, hour or minute corresponds to the setting. These two systems of
alarms (ALARM-A, ALARM-B), each may output interrupt signal separately at a specific time. The alarm
may be selectable between on and off for each day of the week, thus allowing outputting alarm everyday
or on a specific day of the week. The ALARM-A is output from theINTRA pin while the ALARM-B is
output from either the INTRA or theINTRB pins. Polling is possible separately for each alarm function.
Periodic Interrupt:
The ACE5372 can output periodic interrupt pulses in addition to alarm function from the INTRA
andINTRB pins. This frequency may be selected from 2Hz, 1Hz, 1/60Hz, 1/3600Hz and monthly by
controlling register (at lower 3 bits of internal address EH) output selectively.
Output waveform for periodic interrupt may be selected from regular pulse waveform (2Hz and 1Hz) and
waveforms (every second, every minute, every hour and every month) that are appropriate for CPU level
Oscillation Halt Sensing
The oscillation halt sending function uses a register (XSTP bit at internal address FH) to store oscillation
halt information. This function may be used to determine if the ACE 5372 supply power has been booted
from 0V and if it has been backed up. This function is useful for determining if clock data is valid or invalid.
Clock Output
The ACE5372 may output oscillation frequency from INTRB pin. This clock output is set for output by
default, which is set to on or off by setting the register (internal address FH bit CLEN). It can also choose
different crystal oscillator (32.768KHz or 32.000KHz) by setting the register (internal address 7H at bit
XSL), and output clock pulses with two different frequencies.
Registers
1. Clock Counter ( at internal address 0-2H )
*Time digit display ( in BCD code )
Second digits: Range from 00 to 59 and carried to minute digits when incremented from 59 to 00.
Minute digits: Range from 00 to 59 and carried to hour digits when incremented from 59 to 00.
Hour digits: See descriptions on the12/24 bit (Section 7). Carried to day and day-of-the week digits
when incremented from 11 p.m. to 12 a.m. or 23 to 00.
Any registered imaginary time should be replaced with correct time as carrying to such registered
imaginary time digits from lower-order ones cause the clock counter malfunction.
Second digit register ( at internal address 0H)
D7 D6 D5 D4 D3 D2 D1 D0 Operation
- S40 S20 S10
S8
S4
S2
S1 Write
0 S40 S20 S10
S8
S4
S2
S1 Read
0 Undefined Undefined Undefined Undefined Undefined Undefined Undefined Default
VER 1.4 5
5 Page 
ACE5372
Low Power Real-Time Clock (RTC)
CT2, CT1, CT0
Periodic interrupt cycle select bit
Description
CT2 CT1 CT0
Wave Form
Mode
Cycle and INTRA（INTRB）Falling Timing
000
-
INTRA（INTRB）at high level
001
-
INTRA（INTRB）at low level
010
Pulse Mode
2Hz（Duty 50%）
011
Pulse Mode
1Hz（Duty 50%）
100
Level Mode
Every second（synchronized with second count up）
101
Level Mode
Every minute（00 second of every minute）
110
Level Mode
Every hour（00 minute 00 second of every hour）
111
Level Mode
Every month（the 1st day 00 A.M. 00 minute 00 second of every
month）
1) Pulse mode: Outputs 2Hz, 1Hz clock pulses. For relationships with counting up of seconds see the
diagram below.
In the 2Hz clock pulse mode, 0.496s clock pulses and 0.504s clock pulses are output alternatively.
Duty cycle for 1Hz clock pulses becomes 50.4%.
2) Level mode: One second, one minute or one month may be selected for an interrupt cycle. Counting up
of seconds is matched with falling edge of interrupt output.
3) When the time trimming circuit is used, periodic interrupt cycle changes every 20 seconds.
Pulse mode:“L” duration of output pulses may change in the maximum range of ±3.784ms (±3.875ms
when 32KHz crystal is used).
For example, Duty will be 50±0.3784% (or 50±0.3875% when 32KHz crystal is used) at 1Hz.
Level Mode: Frequency is one second may change in the maximum range of ±3.784ms (±3.875ms
when 32KHz crystal is used).
Relation Between Mode Waveforms and CRFG Bit
Pulse mode
VER 1.4 11
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet ACE5372.PDF ] | |
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