Part Number:BQ76PL455A
Hi team,
I have a customer who is designing a system around the Bq76PL455A, and has questions about cabling:
I wanted to understand the daisy-chain specification a little bit more. I just want confirmation that the length imposed in equation 13 in datasheet is between two IC’s, not the total length of bus length of all the IC’s tied together. I suspect it’s the former, based on the first sentence of section 8.1.2.2.3, but just want confirmation in my understanding.
- Are shielded cables recommended? My understanding is that shielded cables aren’t recommended because of the added capacitance. Is this true?
- If we were to use a shielded cable, which capacitive value would we choose to use for the formula? The cable to shield capacitance, conductor to conductor? Overall capacitance?
- If we were to use a shielded cable, which potential do we tie the shield to?
- If we’re going to stack the BQ’s up to a 1000V using the up/down connection, how would we define the cable insulation?
- In figures 33 and 34 in datasheet, how were the capacitances of the dual common mode choke setup determined? In the EVM user-guide it says that its 40pf. The datasheets don’t really mention a capacitance. We’re using the recommended parts, but would like to understand this interface more.
Does the cable have to be 120 ohm impedance? Or can it be others. I understand the recommendation is to use CAN Cabling. Which would mean we could use RS485 cabling as well?
I can set up a call if that is easier.
Thanks!
Brian