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PDF NJU6350 Data sheet ( Hoja de datos )
| Número de pieza | NJU6350 | |
| Descripción | SERIAL I/O REAL TIME CLOCK | |
| Fabricantes | New Japan Radio | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de NJU6350 (archivo pdf) en la parte inferior de esta página. Total 9 Páginas | ||
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NJU6350
SERIAL I/O REAL TIME CLOCK
s GENERAL DESCRIPTION
s PACKAGE OUTLINE
The NJU6350 is a serial I/O Real Time Clock suitable for
4 bits micro-processor.
It contains quartz crystal oscillator, counter, shift register,
voltage regulator, voltage detector, and interface controller.
The NJU6350 required only 3-port of microprocessor for
data transfer, and the microprocessor can receive the data
at any time when the microprocessor requires.
The operating voltage is as wide as 2.0V to 5.5V,
consequently, the NJU6350 can count accurate time data
even if the back up period.
Furthermore, the long time back up is available as the
current consumption during the back up period is less than
2µA.
NJU6350R
NJU6350C
s FEATURES
q Operating Voltage
: 3.0V ± 20%
2.0V to 5.5V ( The clock operation )
q Low operating current : 0.8 µA ( Typ. ) at 2.0V
2.0 µA ( Max. ) at 2.0V
q BCD Counts of Seconds, Minutes, Hours, Days of Week,
Date, Month and Year
q Required only 3-port ( DATA, CLK and CE )
q Low Battery Detector ( Low voltage alarm signal output )
q Automatic Leap Year Compensation : Up to AD 2099
q Package Outline
: VSP 8 / Chip
q C-MOS Technology
s PIN CONFIGURATION
FOUT 1
XT 2
XT 3
VSS 4
8 XDD
7 DATA
6 CLK
5 CE
1 page  
NJU6350
< Reading timer data >
In case of
The DATA terminal is changed over from Output to Input
CE
Input data CLK
1 2 3 4 5 6 7 8 9 10 11 12
DATA 0 0 1 0 1 0 0 0 1 0 0 0
RW C0 C1 C2
M0 M1 M2 M3 M4 0 0 0
System control writing data
Timer reading data
The DATA terminal is changed over from Input to Output at the arrow.
( Note5 ) The first 8 bits of timer data are effective. (In case of Days of week, the first 4 bits are effective.)
4. Voltage Detect Function
The NJU6350 incorporates the low battery detector. If the supply voltage reduce to the detection level,
Detector check flag is " 1 " as warning code for the CPU. When power on reset or data writing operation, the
Detector check flag is set “ 0 “. The low battery detector operates one time per 1 second.
5. Data Access
The NJU6350 can operate from 2.0V to 5.5V. However, the data access must operate in the range of
3V±20%.
6. Crystal Oscillator Circuit
The crystal oscillator circuit in the NJU6350 incorporates the capacitors. Therefore, it can operate with only
external crystal for 32.768kHz.
However, the external capacitors are required to get the matching between the incorporated oscillator and a
external crystal in accordance with the characteristics of crystal.
32.768kHz
Rf = 20MΩ (TYP)
XT
Cg = 31pF (TYP)
XT Ro = 320kΩ (TYP)
Cd = 18pF (TYP)
5 Page | ||
| Páginas | Total 9 Páginas | |
| PDF Descargar | [ Datasheet NJU6350.PDF ] | |
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