Z8PE003 Datasheet, PDF(45/48 Page) Zilog, Inc. – FEATURE-ENHANCED Z8PLUS 1K ROM ONE-TIME PROGRAMMABLE (OTP) MICROCONTROLLER

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Z8PE003 Datasheet, PDF (45/48 Pages) Zilog, Inc. – FEATURE-ENHANCED Z8PLUS 1K ROM ONE-TIME PROGRAMMABLE (OTP) MICROCONTROLLER

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ZiLOG

Z8PE003

Z8Plus OTP Microcontroller

INPUT PROTECTION

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

from the I/O pad to VCC and VSS (Figure 43).

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

ode, from the pad to VSS (Figure 44).

VCC

PB5

VSS

Figure 43. I/O Pin Diode Input Protection

VSS

Figure 44. PB5 Pin Input Protection

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 VSS from this pin should

be used to prevent entering the OTP programming mode or

to prevent high voltage from damaging this pin.

DS007500-Z8X0399

PRELIMINARY

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