What is the reason for the "C33" capacitor specification of the dc1653a should be 630V?
The capacitor is rated to take a full battery-stack potential (say 400V) in the event that a safety plug was disconnected that would otherwise keep the bias near zero. Actual experience indicates that the hookup is best made between the grounds of the ICs rather than from bottom to top of the cell groups as in the demo. This cap helps minimize noise in the single-ended signaling of the daisy chain. In most applications 100V would do.
I would suggest that if a daisy-chain is being contemplated that the higher performing LTC6804 or LTC6811 be considered (for up to 12 cells) as the twisted-pair isoSPI links of those parts will vastly outperform in the presence of system noise on the pack or if testing will subject the links to Bulk Current Injection(BCI) testing.
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I have to move your question to the Power by Linear group. Thank you very much.
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