Checkpoint LAB USB-RS232 Manuel d'utilisateur télécharger pdf (Page 15)

NOISE IMMUNITY

OVER-VOLTAGE PROTECTION

Fuse

1N5339 (5.6V for a 5.0V input)

input port

–

(+)

(–)

Zener diode

(also MOV)

Helps against

transients and over

voltage protection.

Unfortunately fuses

may not be

sufficiently fast to

protect your circuit.

Understand the

incoming

environmental

conditions.

NOISE IMMUNITY

TRANSIENT PROTECTION FOR DIGITAL INPUTS

Many digital devices

including microcontrollers

include diodes on their

GPIO to protect from

transients. Check the

manufacturer’s spec sheet.

Add if transients may be

an issue to protect CMOS

inputs (or any input

circuit).

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Checkpoint LAB USB-RS232 Manuel d'utilisateur Page 15