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AN4057 Datasheet(PDF) 5 Page - STMicroelectronics |
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AN4057 Datasheet(HTML) 5 Page - STMicroelectronics |
5 / 13 page AN4057 Overview Doc ID 022842 Rev 2 5/13 1 Overview These SPC560Pxx /SPC56APxx microcontrollers are members of a new microcontroller family built on the Power Architecture®. The device is supplied externally with a single 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. The note describes application fault conditions that may offset VDD_HV_REG significantly and 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 power up on VDD_HV_REG pin starting from ground level are described in the SPC560Pxx/SPC56APxx data sheet (for further details see Section Appendix A: Additional information). Possible causes of fault conditions injecting an offset voltage on VDD_HV_REG pin are described in the following list: ● Supply microcontrollers I/O VIN while the microcontroller is switched off with shorted supply for VDD_HV_REG and VDD_HV_IO pins ● Offset voltage injected on VDD_HV_REG by external signal(s) shorted to battery. 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. |
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