SPI

[Can Chen]

Posted on January 01, 2017 at 04:35

Hello!

I want to design a pump station with 12 channels, each channel drive by a stepper motor. And the system, I plan to use STM32F205+L6470,  but  some issues need help.

1. Can 

STM32F205 

synchronously 

drive 12pcs 

L6470 by SPI interface with daisy chain?

2. The CK, CS, SDO, SDI 

drive capability is enough? If not enough, how to solve?   #the-stm32f205-spi-interface-can-drive-12pcs-l647* #the-stm32f205-spi-interface-can-drive-12pcs

[Oliver Beirne]

Posted on January 03, 2017 at 11:29

Hello

Chen.Can.001

I have moved your post to

https://community.st.com/community/automotive-mcus-community/spc5-automotive-mcus?sr=search&ampsearchId=39bd4ceb-cc1e-4dba-b0f8-6eda635e3b22&ampsearchIndex=0

forum where product-related queries are asked. 

Happy new year

[Can Chen]

Posted on January 05, 2017 at 09:41

Hi Oliver Beirne,

Thanks a lot. 

But no one reply my question till now, do you know any ST engineer on line?  I want to ask them directly, cause my time is tight. The project is started.

Looking forward to you reply.

Happy new year.

Best regards.

[Oliver Beirne]

Posted on January 05, 2017 at 14:56

Sure thing,

&

Yvin.Erwan.001

Please could you help out here or know someone that can?

Thanks!

[Erwan YVIN]

Posted on January 05, 2017 at 16:52

Hello Oliver ,

You should move this post in

https://community.st.com/community/stm32-community

 

there is a nice reactivity and bigger community.

We take care SPC5 MCUs (Based on PowerPC Core)

    Best regards

                Erwan

[Oliver Beirne_2]

Posted on January 05, 2017 at 16:55

Hi Erwan

Can you refresh and check if you have moderator rights please? You should be able to move the post now.

[Erwan YVIN]

Posted on January 06, 2017 at 09:44

Hello Can Chen ,

i have moved this post in STM32 MCUs Forum

oliverbeirne

‌ , Admin rights issue issolved,

Thank you for your support.

Best regards

Erwan

[Jeroen3]

Posted on January 06, 2017 at 11:22

I can try to answer.

1. Yes, it looks like you can create a string of 12 spi devices. The L6470 supports daisy chained mode. In the master you would have to perform multiple writes during one CS session to daisy chain, depending on the amount of data you want to write. I'd suggest you put on some bypass jumpers during software development.

You could perhaps split the chain in 2x6 or 3x3. Your choice.

2. I can't find maximum capacitive load for IO pins in the datasheet. But a few of those small SC-88 configurable gates are cheap to scatter around if you encounter problems. Be aware of additional delays.