Good practices of system power supply

AN4218

10/26

DocID024014 Rev 2

2

Good practices of system power supply

2.1

This section shows the measurements done on a system-basis-chip L99PM62GXP, which

In addition to the microcontroller power supply this device provides also an NRESET output,

which should be used to drive the microcontroller NRESET input for achieving maximum

reliability of the microcontroller power-up state.

The measurements have been taken from the STMicroelectronics In-Application-Validation-

Report of the L99PM62GXP. This document is available on request.

2.1.1

L99PM62GXP block diagram

Figure 8 shows a typical ST system-basis chip, which contains voltage regulators to

generate the supply for the microcontroller (output V1). Additionally it provides physical

layer interfaces (LIN, CAN), a serial-parallel interface and various high-side and low-side

drivers.