CCS/BQ76PL455A-Q1: Regarding UART communication of the IC with the host

kishor jayaram

Part Number: BQ76PL455A-Q1

Tool/software: Code Composer Studio

Hi,

I am using piccolo-2000(28027F) as a host for the BMS IC BQ76PL455A-Q1. VIO pin of the Bq76pl455a-q1 ic is powered by the same power supply as of host controller ie. 3.3V.

but when i monitor the waveform during the UART communication of the ic and the host controller. the RX of IC signal has 3.3V peak to peak( min:0 and Max:3.3v) and TX of IC has 2.0v peak to peak (Min: 1.4 Max:3.3v)

Attached is the screenshot of monitored signals in oscilloscope for BQ76pl455a-q1 ic pins

channel 1- yellow - TX

channel 2- blue- RX

My Question is why am i getting different logic low levels for the TX & RX

over 8 years ago

0 David Wiest Jr over 8 years ago

TI__Genius 11480 points

Kishor,

I am assuming that you are working with Indrajet, as his post contains the same problem description and data. It appears that the code is not interacting with the bq76PL455AQ1 correctly. I have asked him to provide more detail regarding your guy's setup and code.

0 kishor jayaram over 8 years ago in reply to David Wiest Jr

Prodigy 130 points

David W,
Thank you for the reply. I was not aware that he posted the same question I apologize for repeating the same question.
I will get updated with this solution via indrajet .
Regards
Kishor

0 David Wiest Jr over 8 years ago in reply to kishor jayaram

TI__Genius 11480 points

Kishor,

It is no problem... I just wanted to be sure. Please feel free to reach out if you have questions!

Power management

Power management forum

CCS/BQ76PL455A-Q1: Regarding UART communication of the IC with the host