Recommended Touchscreen for nRF52810

[Jeremysee]

Hello,

I am designing a wearable using the nRF52810 chip and would like to ask if there are any recommended touchscreens to be used? My main concerns are

• SPI bus (at 8MHz) is fast enough to drive a suitable refresh rate
• Size, looking for something around a 1 inch diagonal/diameter
• Touch interface that is compatible with the chip

Thank you!

[Jeremysee]

The screen I'm looking at uses a dual SPI interface, to use it a 60Hz refresh rate requires a 45Mbps data rate.

[awneil]

Jeremysee said:

using the nRF52810 chip

Note that the nRF52810 is cut-down version of the nRF52832;  it has limited Flash and RAM - so may not be a great choice if you're thinking of adding an HMI with graphics and touch ...

There is no specific touch interface.

[Jeremysee]

To overcome the limitations of the 8Mbps SPI interface, I intend to buffer the data I send to the screen. Would that be enough or switching to a more powerful chip like the nRF52832 or nRF52840 be more advisable?

[Jørgen Holmefjord]

If you want to use Dual SPI mode, you will have to move to nRF52840. This has a QSPI peripheral, supporting single/dual/quad line SPI.

[Jeremysee]

Should I be worried about any hardware bottlenecks for a 60Hz refresh rate on a 240x240 panel?