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PDF SM8578BV Data sheet ( Hoja de datos )
| Número de pieza | SM8578BV | |
| Descripción | Real-time Clock IC | |
| Fabricantes | Nippon Precision Circuits Inc | |
| Logotipo |  |
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SM8578BV
Real-time Clock IC
OVERVIEW
The SM8578BV is a serial interface, real-time clock IC that uses a 32.768 kHz crystal oscillator for its refer-
ence timing. It comprises second-counter to year-counter clock and calendar circuits that feature automatic
leap-year adjustment, alarm and timer interrupt functions, as well as oscillator stop, timer reloading, and other
detection functions. Data is transferred to and from an external controller using a 3-wire serial interface. It is
available in compact 8-pin VSOP packages, making it ideal for use in all types of portable, hand-held equip-
ment.
FEATURES
I 1.6 to 5.5V wide operating voltage range
I 0.5µA (typ.) current consumption
(VDD = 3.0V, CE = Low)
I 3-wire serial interface control
I Day, day-of-week, hour, and minute alarm inter-
rupt function
I 1/4096 seconds to 255 minutes presettable interval
timer interrupt function
I Time update detection function
I Abnormal oscillation detection function
I Automatic leap-year adjustment function
(Western and Japanese calendars)
I Oscillator capacitor CD built-in
I Molybdenum-gate CMOS process
I Miniature 8-pin VSOP package
ORDERING INFORMATION,
Device
SM8578BV
Package
8-pin VSOP
PINOUT
(Top view)
INTN 1
XTN
XT
VSS 4
PACKAGE DIMENSIONS
(Unit: mm)
8 VDD
DATA
CLK
5 CE
0 to 10°
0.585typ
3.12 ± 0.3
+
0.15 −
0.1
0.05
0.65
0.22 ± 0.1
NIPPON PRECISION CIRCUITS INC.—1
1 page  
Timing Diagrams
SM8578BV
CLK
CE
tCS
50%
tCLK
tWL tWH
50%
tCH tCKH
tCR
Data write
Data read
CLK
50%
t DH
DATA
50%
t DS
CE 50%
t CS
t RF
CLK 50%
DATA
CE
t RF
90%
10%
t RD
50%
50%
t RZ
90%
Hi−Z
10%
NIPPON PRECISION CIRCUITS INC.—5
5 Page 
SM8578BV
INTERRUPT HANDLING
Alarm Interrupt
I If AIE = 1 when the alarm occurs, output INTN goes LOW. If AIE = 0, INTN is in high impedance state.
I The alarm interrupt is output when the 10s seconds digit carries over to the minutes digit.
AIE bit
INTN output
AF bit
"1"
"0"
No output while AIE is "0"
Hi−Z
LOW−level
Data 0 written to AF
"1"
"0"
Alarm interrupt
timing
Timer Interrupt
I The TI/TP bit setting selects either level interrupt mode or periodic interrupt mode output (with the AIE and
FE bits set to “0”).
(1) Level interrupt mode (TI/TP = “0”)
I If TIE = “1” when the interrupt occurs, output INTN goes LOW. If TIE = “0”, INTN is in high imped-
ance state.
TIE bit
INTN output
TF bit
No output
while TIE is "0"
Data 0 written to TF
"1"
"0"
Hi−Z
LOW−level
"1"
"0"
Timer interrupt
timing
NIPPON PRECISION CIRCUITS INC.—11
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet SM8578BV.PDF ] | |
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