AN4057

Overview

Doc ID 022842 Rev 2

5/13

1

Overview

These SPC560Pxx /SPC56APxx microcontrollers are members of a new microcontroller

voltage supply, which can be either 5 V or 3.3 V depending on application requirements.

Internally the chip operates with 2 supply voltages, namely the main supply (5 V or 3.3 V)

and the core logic supply (1.2 V).

This document provides guideline for the recommended configuration of the high and low

voltage supply for the internal regulator in order to ensure the correct power up sequence of

the microcontroller.

mitigating circuitries to ensure reliable power up in case of these fault conditions. The

standard supply circuitry and sequence that use in the recommended conditions of initial

SPC560Pxx/SPC56APxx data sheet (for further details see Section Appendix A: Additional

information).

described in the following list:

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1.1

Power up sequencing

Preventing an overstress event or a malfunction within and outside the device, the

SPC560Pxx/SPC56APxx implements a specific power up sequence, as described in the

data sheet, to ensure each module is started only when all conditions for switching it ON are

available.

In case of a fault condition on the application board, that sequence may not be respected,

causing the device not to exit the power up.

Two possible fault conditions are described in the following sections. However, if the fault

cause is removed, the device (while within the absolute maximum ratings) works again,

without getting damaged, powering up properly.