Zilog Z8PE002 Manual de usuario descargar pdf (Pagina 45)

Z8PE002

ZiLOG Z8Plus OTP Microcontroller

DS008700-Z8X0799 P R E L I M I N A R Y 45

INPUT PROTECTION

All I/O pins feature diode input protection. There is a diode

from the I/O pad to

and

(Figure 43).

However, the PB5 pin features only the input protection di-

ode, from the pad to

(Figure 44).

The high-side input protection diode was removed on this

pin to allow the application of high voltage during the OTP

programming mode.

For better noise immunity in applications that are exposed

to system EMI, a clamping diode to

from this pin should

be used to prevent entering the OTP programming mode or

to prevent high voltage from damaging this pin.

Figure 43. I/O Pin Diode Input Protection

Figure 44. PB5 Pin Input Protection

PB5

1 2 ... 40 41 42 43 44 45 46 47 48

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Zilog Z8PE002 Manual de usuario Pagina 45