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NJU6350C

SERIAL I/O REAL TIME CLOCK

Japan Radio Corporation  

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

1000 1000

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)

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