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AM2611-Q1: Why the reference design don't follow the hardware desgin user guide

Shuqing Zhou
Expert 4295 points

Part Number: AM2611-Q1
Other Parts Discussed in Thread: LP-AM261, TIDA-010979

Hi team,

We have the AM26x Hardware Design Guidelines: www.ti.com/.../sprabj8d.pdf

it recommends it should place 13 0.1uF cap

image.png

but in our LP-AM261 reference desgin, it just places 9 0.1uF cap

why it's not same? 

Customer use ZNC package now, do we recommend them place 18 0.1uF cap around the 1.25v core? In our TIDA-010979, we also not follow this user guide

BRs

Shuqing

 

  • +1
    TI__Expert 3630 points

    Hi Shuqing,

    As per the same hardware design guideline, the capacitor numbers mentioned "are reasonable starting points for any AM263x, AM263Px, or AM261x PCB design. However, due to specific PCB routing differences and the resulting plane capacitance and decoupling mounting inductances and other parasitics, TI highly recommends that designers simulate and measure the specific power distribution network performance". So based on these PDN simulations(also covered in the same document), we have different numbers in our EVMs

    Hope this makes it clear.

    Thanks,
    Tejas Kulakarni