STM32L432Kx Flash Size

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FidoKey rev. a - top view.jpg

The STM32L432Kx is available with two different flash sizes. The STM32L432KB has got 128 kB while the STM32L432KC has got 256 kB. I recently created a USB "key" using the STM32L432. The reason for using this specific STM32 MCU was twofold:

  1. It is small
  2. It's got a built-in 48 MHz oscillator precise enough to use USB without an external crystal

Unfortunately, while I wanted the 256 kB version, only the 128 kB version was available.