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TIDA-01627: Need for SPI Chip + Reference design in parallel

Part Number: TIDA-01627

Hi

I have two questions regarding the new TIDA-01627 Reference design:

1. On Page 4 (Section 2.2.1) it says "The TPS65983B has been specifically chosen because it provides higher memory along with an endpoint to add a state machine, which controls the BQ25703A device and allows the user to update the firmware, respectively"

Nowhere else in the document is any reference to the SPI Flash seen in the schematic. So the TPS65983B doesn't have any memory (if I am not mistaken) and uses the SPI Flash?!

2. Is it possible to create a device using two of these reference designs? If yes,

-are they both simply connected to the same battery and only allow one sink at a time

-can they make use of BQ25703A's PowerPath management to reduce battery wear

Can you save on parts (f.e. just one 3.3V DCDC Converter or maybe even just one BC25703A)?

Thank you so much,

Karim

  • Hi Karim,

    Thanks for your interest in this reference design.

    Answers to your queries are as follows:
    1. TPS65983B doesn't have a flash memory, it downloads the program contents from SPI flash to it's RAM and executes it from RAM. SPI flash holds the program until TPS65983B needs it.

    2. Yes it's possible.
    a. Yes, you can connect both of them to the same battery but need to ensure that the both the ports shouldn't charge the battery at the same time. You can use some external logic to ensure that if a PD power adaptor is connected to one of the port then you disable the second port in the design.

    b. In the current design we already use BQ25703A's power path to charge or draw power from the battery.

    c. Yes, you can remove some of the redundant parts like regulator, some basic passives etc.

    Thanks,
    Rahul