TCAN4550: VCCOUT is for what block inside TCAN4550

[FAE] Andrew Wang

Genius 10685 points

Part Number: TCAN4550

Hi Team,

As topic, which block in TCAN4550 is VCCOUT supplied to? Thanks.

Andrew

over 6 years ago

0 Eric Hackett over 6 years ago

TI__Guru 74252 points

Andrew,

The VCCout block powers the integrated CAN transceiver and has a total current capability of 125mA. It can be used to power an external load, but consideration has to be taken for how much current the integrated CAN transceiver can consume at any given time when calculating the max external load the output can handle.

Does this answer your question?

Regards,

0 [FAE] Andrew Wang over 6 years ago in reply to Eric Hackett

TI__Genius 10685 points

Hi Eric,

Thanks! Please correct me if I am wrong.

VIO supplies the SPI interface, and cannot directly connect to VCCOUT, VIO must settle before VCCOUT, therefore must use separate source for VIO, correct?

Andrew

0 Eric Hackett over 6 years ago in reply to [FAE] Andrew Wang

TI__Guru 74252 points

Andrew,

There shouldn't be an issue tying VCCout to VIO, there isn't any timing requirement on either supply. Was there something you read that said otherwise?

Regards,

0 [FAE] Andrew Wang over 6 years ago in reply to Eric Hackett

TI__Genius 10685 points

Hi Eric,

Maye I mis-understood, so I don't need to follow Figure 15. Power Up Timing ?

It showed VIO settled before VCCout. Thanks!

Andrew

0 Eric Hackett over 6 years ago in reply to [FAE] Andrew Wang

TI__Guru 74252 points

Andrew,

The VCCout timing in that plot is purely based on the timing of VSUP crossing the wake up threshold and the how long VCCout takes to ramp from that time. VIO is powered up at a seemingly random time because it is system dependent, and is only there to show the timing of it ramping up and then the CLKIN signal beginning to work. They are independent of each other.

Does this make sense?

Regards,

0 [FAE] Andrew Wang over 6 years ago in reply to Eric Hackett

TI__Genius 10685 points

Yes, thanks for your help!

Andrew

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TCAN4550: VCCOUT is for what block inside TCAN4550