STM8T142-EVAL evaluation board: ESD tests

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STM8T142-EVAL evaluation board: ESD tests

The STM8T142-EVAL evaluation board was tested against ESD stress using some of the

protection methods described in Section 3: Protecting against ESD.

4.1

Test setup

Two ESD protection methods were tested: spark gaps and adding resistance (by testing a

small serial resistor).

During the test, the STM8T142-EVAL evaluation board was supplied by a small 12 V lead-

acid battery through an L7805 regulator (see Figure 5).

Figure 5.

Test set up

The STM8T142-EVAL evaluation board was not originally designed to take ESD stress into

account:

●

The onboard serial resistor (size 0603) is voltage undersized.

●

The insulation distance between the electrode and the neighbouring PCB tracks is too

small so that discharges can be seen directly on the device.