Guru
Joined: 11/02/2018
Location: AustraliaPosts: 3319
| Posted: 07:24am 30 Mar 2026 |
I expect a PFET would work if it doesn't have a body diode.
If the PFET has a body diode the anode (connected to the drain) would need to be connected to LCD_DO as that pin goes low when idle, The body diode needs to be reverse biased when idle.
The PFET would then be a source follower so its gate threshold voltage would need to be lower than the 1 to 0 transition voltage of the Pico.
I have found the diode plus resistor method to be very reliable and simple to implement.
It is just a matter of using a suitable diode, which can be from a wide range of common types.
Edited 2026-03-30 17:30 by phil99