NEC PD75P308 Manual do Utilizador descarregar pdf (Página 9)

PD75P308

TYPE M-C

data

output

disable

P.U.R.

enable

P.U.R.

IN/OUT

P–ch

N-ch

P.U.R. : Pull–Up Resistor

1.4 NOTES ON USING P00/INT4 AND RESET PINS

In addition to the functions shown in sections 1.1 and 1.2, the P00/INT4 and RESET pins also have a function

to set a test mode (for IC testing) in which the internal operations of the

PD75P308 are tested.

When a voltage higher than V

DD is applied to either of these pins, the test mode is set. This means that, even

during ordinary operation, the

PD75P308 may be set in the test mode if a noise exceeding VDD is applied.

For example, if the wiring length of the P00/INT4 or RESET pin is too long, noise superimposed on the wiring

line of the pin may cause the above problem.

Therefore, keep the wiring length of these pins as short as possible to suppress the noise; otherwise, take noise

preventive measures as shown below by using external components.

• Connect diode with low V

F between VDD

and P00/INT4, RESET pin

• Connect capacitor between V

and P00/INT4, RESET pin

V DD V DD

V DDV DD

P00/INT4, RESET

Diode with

low V

P00/INT4, RESET

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NEC PD75P308 Manual do Utilizador Página 9