CE0Q7PV0

Voltage expansion IO board

Overview

Design background:
Recently, when using the development board demo, we often encounter the problem that the external modules have large currents and different voltages and need independent power supply, which leads to the need to use multiple power supplies. Later, we directly draw the 5V and 3.3V LOD chips into the board according to the commonly used power supplies of 5V and 3.3V for the development board.
Engineering principles and functions:
(1) The board can be powered by USB and socket power supply. The socket power supply voltage is 7V-12V. After being stepped down by LM1084S-5.0/TR and LM1084R-3.3, it can output 8 5V and 8 3.3V voltages at the same time to power the development board and other modules at the same time.
(2) The board provides 5 pull-up circuit switches and 5 pull-down circuit switches and IO ports. The voltage of the pull-up/pull-down circuit can be selected according to the actual situation, and the selection is made using a shorting cap.
Related pictures:

Design Files

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Update:2025-06-28 13:06:00

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