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James Jo

James Jo

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Based off the following spreadsheet, the 12-cell layout will cost the overall AFE system approximately $86.76 while the 18-cell layout will cost $57.84, allowing us to save $28.92 on the entire system. The spreadsheet does not include the prices of major ICs such as the battery cell monitors or MUXs as there is the possibility for us to acquire samples through the manufacturers.The LTC6811 costs $34.93 while the LTC6813 costs $44.47. Also, the MUXs have yet to be chosen so their associated costs have yet to be determined. The cost breakdown does not include the connectors, though they are included in the spreadsheet, as final harnessing and the necessary connectors are undecided and can differ substantially in comparison to the current revision.

 Pros and Cons

Pros

Cons

LTC6811

  • Firmware development is mostly complete

  • More compact board sizes

  • Lower total measurement error (1.2mV)

  • More debugging and assembly required which can increase error likelihood

  • Increased isoSPI distances which can increase error, though impact may be negligible

LTC6813

  • Reduces the number of boards to two

  • Connections can be robust

  • Less assembly required

  • More GPIO pins available

  • Need to develop firmware for extra battery groups and MUX

  • Greater overall board size

  • Greater planning required for wiring

  • Higher total measurement error (2.2mV)

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