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AFE1594EVM: AFE1594EVM daughter board pinout

Elettra Giacomin
Prodigy 30 points

Part Number: AFE1594EVM
Other Parts Discussed in Thread: AFE1594, AFE159RP4

I'm trying to drive the smaller daughter board of the AFE1594 evaluation board (the one housing the two AFE159RP4 chips) using my own MCU and I would like to ask for clarifications regarding the wiring on the four header strips on its underside:

WhatsApp Image 2026-08-06 at 16.23.04.jpeg

Firstly, how are they oriented compared to the reference schematic in the manual? I want to avoid accidentally shorting the circuit.

Screenshot 2026-08-06 at 16.19.10.png

Secondly, I'd like to ask for clarification regarding some of the listed pins:

  • What is the OUT 4M pin on J1.6?
  • On headers J3 and J4, some pairs of pins (such as J3.1 and J3.2) are wired together and marked with a zero-ohm (?) resistor between them and the external connection. Is this signaling that the user should take care to wire the two pins together and not put any resistance in front of them?
  • What is the VREF pin on J3.5?
  • What is the AFE VDD 1P8 (twin) pin on J4.8/J4.9?

Thank you for your attention

  • 0
    TI__Guru 69246 points

    Hi Elettra,

    If you look at the top side of the daughterboard, pin 1 of each row for J1-J4 is indicated by a square through-hole.

    OUT_4M is an optional external clock input (see related nets throughout the schematic).

    There are provisions on the J1-J4 headers which are specific to their use with the provided MCU capture card. The important thing is that the two AFEs receive the proper supply voltages (IOVDD, AFE_3.3V or AFE_5V, and AFE_VDD_1P8). You may use any header connections which are routed to those nets.

    You do not need VREF. This is just an optional voltage rail brought to the AFE board for testing options.

    Please read the AFE159RP4 datasheet for 1.8V supply connection and usage.

    Regards,

    Ryan