SKEAZ64 CAN

[suntaoisme]

I'm using the SKEAZ64MLH4  for 500kbit/s CAN communication. The configuration sampling point is only up to 80% and the my customer needs a sampling point greater than 85%, Please kindy assist in confirming if there is a feasible configuration?微信图片_20250513102641.gif

[Celeste_Liu]

Hello @suntaoisme ,

Thanks for your post.

sample point= (1+TSEG1)/(1+TSEG1+TSEG2), So, according to your configuration, the sample point is calculated as follows:

sample point = (1+ 7) /(1+7+2) = 80%

If you want to achieve a sample point greater than 85%, you need to increase TSEG1. For example, if TSEG1 is increased to 13, the sample point can reach 87.5%.

Hope it can help you.

BRs,

Celeste

[RalphLIU]

Dear Celeste, 

 thanks for your support, but if only improve Time SEG1, is there some way to  guarantee 500K bit rate?    

[suntaoisme]

suntaoisme_0-1747442733253.png

Thanks for your reply. Would modifying T1 alone be ineffective, and would it provide a solution to validate that it works? Thanks.

[Celeste_Liu]

Hello @suntaoisme ,

I'm curious about which IDE you used for the configuration page. I'm using Processor Expert in CodeWarrior v11.1 for configuration, and the interface seems different from yours.

Celeste_Liu_0-1747639932041.png

Moreover, we have the CAN timing calculator that refers to AN1798(AN1798: CAN Bit Timing Requirements) to set the communication speed and then calculates all the necessary timing parameters.

Celeste_Liu_1-1747640083432.png

I think there is no issue with the MSCAN configuration in Processor Expert (PE) of CodeWarrior v11.1. You can use this tool to derive all the appropriate parameters.

BRs,

Celeste

[suntaoisme]

Hi Celeste Liu,

suntaoisme_2-1747788315734.png

It's my CW version.

T1=5, T2=8,  sampling point =42% ，and 499.332 Kbit/S is not 500Kbit/S by the customer。

Do you have a better idea of the correct combination of parameters? Thanks.

[Celeste_Liu]

Hello @suntaoisme ,

Thanks for your reply.

You can refer to the following configuration, use the external clock with 10MHz, and let TSG1=16, TSG2=3, then the speed can be 500kbit/s and sampling point = 85%.

Celeste_Liu_0-1748244177738.png

Celeste_Liu_1-1748244333957.png

BRs,

Celeste