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Yuri_Mobulus

Post on

Jan 6, 2025

AX88179B internal buck pins and SPI flash

Hi, Team,


We previously designed around the AX88179 chip. Since it became obsolete, we decided to migrate to the AX88179B. We have a couple of questions we hope you can help us with:


  1. 1.Internal Buck
    What should we do with the internal buck pins (pin 17: AVDD33_BUCK, pin 16: LX) if we are not using the internal buck (because we have an external source for the DVDD11 rail)? Should these pins be terminated in some specific way, or is leaving them unconnected (NC) sufficient?


  2. 2.External SPI Flash
    Could you please confirm that the external SPI flash must support a 40 MHz SCLK for read operations and have a capacity greater than 1 Mbit? What would be the drawbacks of using a slower flash with less memory capacity?

Regards,
Yuri


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  • Sin
    Reply on

    Jan 6, 2025

    Hi Yuri,

    Consider utilizing the AX88179B as a substitute for the AX88179. The Pin16 of the AX88179B serves as a 1.1V output, which can seamlessly power its corresponding 1.1V input pin. Moreover, the AX88179B has the advantage of not requiring an external Flash memory.

    For in-depth information about the AX88179B, kindly refer to the following link:

    AX88179B Product Page

    Thanks.