First batch of DM15C Credit Card Sized Calculators Now Available

[AnnoyedOne]

This is a bit OT but relevant to this discussion IMHO.

The DM15C claims to use the same hardware/firmware as the DM15L. I haven't found any photo's to confirm this--yet.

However there are photo's of the DM15L internals online.

So the DM15L (and DM15C?) use the NXP LP1115 SoC. That part doesn't have a USB controller (unlike the ATSAM4LC2CA SoC in the 15C CE). It does have a UART (serial port) though. Looking at photo's the DM15L internals it has a Silicon Labs CP2102 USB-to-serial bridge. That part is USB 2.0 compliant and works up to 921600 baud. The LP1115 UART works up to 3.125 MBit/s. I have the PDF datasheets for both parts.

So, just like the 15C CE, this device is really serial (over USB). It is not native USB so not "fast". Not a problem but worth noting.

The USB 2.0 standard defines the mini-B connector. USB-C doesn't define any protocol.

A1