MCU Suggestion

[Nico3]

Hello Friends,

I am looking for MCU. Kindly suggest. Below are the minimum requirements

1. Need two SPI.  Need to read data of two sensors via SPI simultaneosly & continously.
2. Need one UART 
3. Need smallest possible foot print.  WLCSP12/TSSOP20/UFQFPN20
4. Do not want to use external cyrstal for clock. Want to use internal clock
5. Robust for shock, vibration.  Pricing is no issue.

Kindly suggest..

   

[Andrew Neil]

STM32 MCU Product Selector:

https://www.st.com/content/st_com/en/stm32-mcu-product-selector.html

 

Distributors often have good parametric search facilities

 

You could also try asking Sidekick:

 

2. Need one UART

5. Do not want to use external cyrstal for clock. Want to use internal clock

Those 2 will not play well together ...

[mƎALLEm]

Hello,

This is what STM32 Sidekick has recommended:

Recommended STM32 MCUs for Small Footprint with Two SPI and One UART

1. STM32G051x6/x8 Series

• Package Options: TSSOP20, WLCSP20
• Peripheral Features:
  • Two SPI interfaces (one multiplexed with I2S)
  • Two USARTs (can be used as UARTs)
• Application Suitability: Supports simultaneous and continuous reading of two sensors via SPI, plus UART communication.
• Footprint: Among the smallest available, ideal for space-constrained designs.

2. STM32C031x4/x6 Family

• Package Options: TSSOP20, UFQFPN28, LQFP32, UFQFPN32, LQFP48, UFQFPN48
• Peripheral Features:
  • At least two SPI interfaces
  • One UART
• Application Suitability: Suitable for simultaneous SPI sensor reading and UART communication.
• Footprint: TSSOP20 and UFQFPN28 are the smallest options.

3. STM32G061x6/x8 Series

• Package Options: TSSOP20, UFQFPN20, WLCSP20
• Peripheral Features:
  • Two SPI interfaces
  • Two USARTs (can be used as UARTs)
• Application Suitability: Supports simultaneous SPI sensor reading and UART communication.
• Footprint: Compact packages suitable for your requirements.

Summary

For your requirements (two SPI, one UART, smallest footprint such as WLCSP12/TSSOP20/UFQFPN20), the STM32G051x6/x8 and STM32G061x6/x8 in TSSOP20, UFQFPN20, and WLCSP20 packages are the most suitable options. The STM32C031x4/x6 also offers TSSOP20 and UFQFPN28 packages with the required peripherals. All these MCUs support simultaneous SPI sensor reading and UART communication in very compact footprints.

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I did the exercise with CubeMx / STM32G051 TSSOP-20 and indeed you can use Two SPIs + one UART at the same time.

 

[Nico3]

Thanks,   

There are lot of mathmatical caculation expected, so I think it is better if MCU has FPU also.

I see C5 series has FPU but  I am afraid of its supply chain as I see very few units on distributors. Once end product is approved, I might need more than 10K units.   

[mƎALLEm]

Thanks,   

There are lot of mathmatical caculation expected, so I think it is better if MCU has FPU also. 

You should indicate that in your first post.

I see C5 series has FPU but  I am afraid of its supply chain as I see very few units on distributors. Once end product is approved, I might need more than 10K units.   

Indeed C5 could be an option but the availability is another subject that you need to check with your local distributor.  

 

[Andrew Neil]

Need two SPI.  Need to read data of two sensors via SPI simultaneosly & continously

Do you really need 2 separate SPIs for that ?

[Nico3]

I am not sure how I can get two sensors reading at same time..so said two SPIs.  In my design, there are two Inertial Measurement Unit (IMU) and I do not want any time lag  between those two readings, so afraid of reading one by one both IMU from single SPI.   

[mƎALLEm]

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