TCAN334: RL open in dominant mode

user4782171

Part Number: TCAN334

Hi Team,

My customer wants to know what's the voltage level on CANH&CANL would be if it's under RL=open and in dominant mode condition?

Best regards,

Albert Lee.

over 3 years ago

0 Max Robertson over 3 years ago

TI__Guru 62910 points

Hi Albert,

You could consider VCC to be a conservative upper limit on the steady-state dominant differential output voltage when there is no resistive loading. To get a better idea of the typical behavior, you could reference Figure 4 and 5 in the datasheet. These show that for 0 mA load current the CANH high level is typically about 3.25 V and the CANL low level is typically about 0.5 V, giving a differential magnitude of 2.75 V.

Max

0 Winston Chen over 3 years ago in reply to Max Robertson

Prodigy 20 points

Hi Max,

Then for the low level of CANL, I think the voltage under 0.5V (0 ~ 0.5V) for the condition RL=0 is reasonable, is it correct?

Winston

Thanks~

0 Max Robertson over 3 years ago in reply to Winston Chen

TI__Guru 62910 points

Hi Winston,

Yes, variation across silicon process and with temperature could cause CANL voltages below 0.5 V, although it would be unlikely to be as low as 0 V due to circuitry in low-side driver intended to block reverse current flow.

Regards,
Max

0 Winston Chen over 3 years ago in reply to Max Robertson

Prodigy 20 points

Hi Max,

Got it, thanks for your confirmation.

Winston

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TCAN334: RL open in dominant mode