user
An STM32 with at least 128KB of Flash, easy soldering, few pins, low power consumption, I²C interfaces and CAN BUS.
alphonsio
The STM32L431KB MCU may be the best choice
Based on your requirements:
An STM32 with:
- At least 128KB of Flash
- Easy soldering
- Few pins
- Low power consumption
- I²C interfaces
- CAN bus
Let's compare the options:
| Part Number | Flash (kB) | Pins (Package) | CAN | I2C | Low Power (µA) | Notes |
|---|---|---|---|---|---|---|
| STM32L431KB | 128 | 32 (UFQFPN) | ✅ | ✅ | 0.01 | ✔️ Minimum flash, meets all |
| STM32L431KC | 256 | 32 (UFQFPN) | ✅ | ✅ | 0.01 | ✔️ Higher flash, same package |
| STM32L432KB | 128 | 32 (UFQFPN) | ✅ | ✅ | 0.01 | ✔️ |
| STM32L432KC | 256 | 32 (UFQFPN) | ✅ | ✅ | 0.01 | ✔️ Best balance |
| STM32L442KC | 256 | 32 (UFQFPN) | ✅ | ✅ | 0.01 | ✔️ Similar to above |
Best Choice : STM32L431KB
- STM32L431KB: has the minimum required 128KB Flash
Best Performance Choice: STM32L432KC
- 256KB Flash (better than 128KB minimum)
- Low pin count (32) in UFQFPN, which is reasonably solderable (especially compared to BGA)
- CAN 2.0 and I²C support
- Very low power consumption
- Same size and specs as others but more memory than STM32L431KB/432KB
For prototyping, you can buy a Nucleo-32 development board with STM32L432KC MCU that supports Arduino nano connectivity: