BQ76PL455 What is the number of IC in stack? 16 or more?

user4704613

Prodigy 50 points

Hello,

I am studing on BQ76PL455 and I am wondering the max. number of IC in stack?

The datasheet describes this number as 16. Why we limited with 16 ?

Thanks for answers.

Best regards

over 8 years ago

0 Roger Hwang over 8 years ago

TI__Genius 10785 points

16 per IC not total. You can stack upto 256 channels.

0 user4704613 over 8 years ago in reply to Roger Hwang

Prodigy 50 points

I mean number of chips in daisy chain with twisted pair. Why this number is up to 16 ?

0 Stephen Holland over 8 years ago in reply to user4704613

TI__Intellectual 2795 points

The device was designed to support just 16 devices. The daisy-chain output to the next IC is just a re-amplified version of the input, so propagation delay either from internal or externally from the cable and isolation and filter circuits will limit the total number of ICs. It is thought that 16 was a sufficient number to support... 256 series LiMnNiCo cells would be over 1000V!

0 user4704613 over 8 years ago in reply to Stephen Holland

Prodigy 50 points

Thank you very much for your information. I have to use a chip with 11 cells because of physical limitations. Because of this reason, i have to use 24 chip for 264 cells which my target number of cells. Is this impossible with BQ76PL455 or just not-easy/ not-recommended ?

0 Stephen Holland over 8 years ago in reply to user4704613

TI__Intellectual 2795 points

Only 16 ICs in a stack can be supported. You will need to implement 2 stacks, with a PL455 configured as communication bridge on each stack (lower module stack and upper module stack) to support this...

0 user4704613 over 8 years ago in reply to Stephen Holland

Prodigy 50 points

Thank you very much for your interest

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BQ76PL455 What is the number of IC in stack? 16 or more?