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Mistakes in the BQ25505 reference design?

Wensi Wang
Prodigy 50 points
Other Parts Discussed in Thread: BQ25505, TIDA-00100

Hi,

Are the eq (2) and eq(3) on page 12 of the BQ25505 reference design (indoor solar power BLE) correct in this document you provided?

http://www.ti.com/lit/ug/tidu235/tidu235.pdf

On this reference design webpage http://www.ti.com/tool/TIDA-00100

you gave a bill of material, is this complete? http://www.ti.com/lit/df/tidr490/tidr490.pdf

Many items seem missing. Any particular reason or just typos?

Can you provide a reference design to use the indoor solar cell along with coin cell (back up) battery? With  possibly a SPDT and voltage detector? 

Wensi

  • 0
    TI__Intellectual 1360 points

     

    Thanks for pointing out - The Bill of material on the link has been fixed

    Equations 2 and 3, there was a typo which is getting fixed. Please refer to the BQ25505 datasheet for the correct equations.

    We dont have a TI Design with a backup battery but you can easily connect as shown in Figure 2 of the BQ25505 datasheet as well as explained in section Figure 30 of the internal management of the BQ device on how it manages the 2 sources of reservoirs. You dont need a voltage detector as BQ device will monitor the secondary source (supercap) and switch to primary if needed