Choosing among nrf52840 nrf5340 and nrf54L15

[Usama Shafiq]

Hi i am currently, doing development on nrf52840. where I have 48 number of GPIO's available. for my application, I have peripherals like Touch screen RGB display, UART based Modem, 4x4 keypad matrix. In short, I have so much to configure with my board.
So I want to know how many GPIO's are available on nrf5340 and nrf54L15. and which will be suitable option for my application. And one last thing Can we use GPIO expanders to increase the GPIO's on nrf5340 ?

[Edvin]

Hello,

Both the nRF52840 and nRF5340 devices have 48 GPIOs, where the pins are very flexible (meaning you can use all GPIOs for almost all peripherals). There are some limitations, such as NFC being locked to two pins, and if you want to use an external LFXTAL, that takes two GPIOS (P0.00 and P0.01). 

The nRF54l15 has 32 GPIOs, and it has some more restrictions on what pins that can be used for what. Please see:

nRF52840

nRF5340

nRF54L15

Best regards,

Edvin