TCAN4550-Q1: TCAN4550-Q1

Ju_We

Part Number: TCAN4550-Q1
Other Parts Discussed in Thread: TCAN4550

Hi All,

I understand everything in the related thread, just one thing bothers me. Why does the datahseet not reflect the fact that values programmed in register 0x100C are interpreted as + 1. For register 0x101C it's mentioned explicitly. I know it has to be correct, the driver software shows it. Also DBRP=0 wouldn't make sense or at least it should be marked as an invalid value if register 0x100C would behave differently compared to register 0x101C.

Best Regards

Juergen

over 2 years ago

+1 Eric Schott1 over 2 years ago

TI__Guru 53575 points

Hi Juergen,

I agree this could be made more explicit in the datasheet. I'm not sure why we were able to include this excerpt for 0x101C and not 0x100C.

The MCAN document for this device is based off Bosch MCAN which provides more explicit information on many of the controller specific functions. Bosch's user's manual (linked below) for instance includes that "The actual interpretation by the hardware of this value is such that one more than the programmed value is used" for the bit timing configuration.
https://www.bosch-semiconductors.com/media/ip_modules/pdf_2/m_can/mcan_users_manual_v330.pdf

Similar information is included in the TCAN4550 software user's guide where we were able to be more verbos on some of the device function description, stating "The TCAN45xx registers for the CAN bit timing interpret values greater than the raw register value".
https://www.ti.com/lit/ug/sllu270/sllu270.pdf?ts=1679319660326&ref_url=https%253A%252F%252Fwww.google.com%252F

I hope these resources help to clarify any other uncertainties you have from the datasheet descriptions. Let us know if there's any other information we can help provide.

Regards,
Eric Schott

Interface

Interface forum

TCAN4550-Q1: TCAN4550-Q1