tiwari.sachin
Full Member level 6
Hello,
I have two power source
3.3V/20mA and
3.3V/1amp
I can control 3.3V/1amp ON/OFF while 3.3V/20mA is always ON
These two are tied together and voltage goes to microcontroller.
3.3V/1amp goes to other peripherals too... Like LCD, switches, and some other devices.
Note: 3.3V/20mA (in series with 3.3V/1amp) is only connected to MCU
Operation details are as follows
when 3.3V/1amp and 3.3V/20mA are tied together, all the devices are ON and everything works properly.
What I need is
There are certain situations where MCU should turn off the 3.3V/1amp and go in sleep mode operating on 3.3V/20mA
In this sleep mode, all peripherals should be off (ie 3.3V/1amp should be disconnected to all teh devices beyond MCU
I am trying to have a p channel MOSFET to do the switching but due to the internal diode seems to create some issues ( I donot want 3.3V/20mA to power any other devices beyond MCU)
How can I achieve this switching.
Hope my explanation was clear
Attached is the image for what I am trying to do.
I have two power source
3.3V/20mA and
3.3V/1amp
I can control 3.3V/1amp ON/OFF while 3.3V/20mA is always ON
These two are tied together and voltage goes to microcontroller.
3.3V/1amp goes to other peripherals too... Like LCD, switches, and some other devices.
Note: 3.3V/20mA (in series with 3.3V/1amp) is only connected to MCU
Operation details are as follows
when 3.3V/1amp and 3.3V/20mA are tied together, all the devices are ON and everything works properly.
What I need is
There are certain situations where MCU should turn off the 3.3V/1amp and go in sleep mode operating on 3.3V/20mA
In this sleep mode, all peripherals should be off (ie 3.3V/1amp should be disconnected to all teh devices beyond MCU
I am trying to have a p channel MOSFET to do the switching but due to the internal diode seems to create some issues ( I donot want 3.3V/20mA to power any other devices beyond MCU)
How can I achieve this switching.
Hope my explanation was clear
Attached is the image for what I am trying to do.