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ADIN2111 single-supply idling power consumption

Category: Hardware
Product Number: ADIN2111

I am measuring power consumption on the AVDD_H, AVDD_L, and VDDIO rails for the EVAL-ADIN2111, and am seeing higher-than-expected consumption. I'd like to understand why this is the case, and get help lowering the power consumption.

I have the ADIN2111 connected to a STM32L496 nucleo board, with the processor onboard the ADIN2111 held in reset. With all 3 buses (AVDD_H, AVDD_L, and VDDIO) powered from 3V3, and the system idling (both PHY activated, and connected in loopback from link 1 to link 2, but not sending or receiving any data), I am seeing a total of 232mW -- 120mW on AVDD_H, 100mW on AVDD_L, and 12mW on VDDIO. This total of 232mW somewhat exceeds the spec given in the datasheet for single-supply, 2.4Vp-p operation at "100% data throughput, full activity" -- the datasheet lists a max power consumption in that state of 215mW. Moreover, given that no data is being sent or received, I would expect a power consumption significantly lower than the spec of 215mW.

1. What is the expected power consumption for an ADIN2111 when the links are active, but not sending or receiving data?

2. Why is my consumption higher than levels described in the datasheet, and what can I do to lower it?

Attached photos: hardware setup. Yellow arrow to show where I am probing power (joulescope inputs replace jumper P14).


  • For added context and comparison, I also tried putting the system into the 1.0 Vp-p transmit setting (by changing the dip-switch), and setting AVDD_H and AVDD_L down to 1.8V (I kept VDDIO at 3V3 because the system stops working when I move it to 1V8; another mystery which I'm putting on the back burner for now). With this setting, the power consumption was lower than before, but still higher than what's listed in the datasheet.

    The ADIN2111 datasheet says to expect 77mW in this state when sending data full-blast; however I am measuring 107mW (39mW on AVDD_H, 54mW on AVDD_L, and 14mW on VDDIO). This measurement was taken in a loopback configuration with both links active, but not sending or receiving any data. Any thoughts on why I'm seeing higher-than-expected consumption?

  • Can you please send me a relationship of the jumpers on the ADIN2111 board and their configuration?



  • Sure! Attaching photo for reference.

    Jumper settings:

    J101; P22: jumper between "SH" and earth GND.

    P4: all 3 jumpers present (USB, EXT, GND).

    P11: VCCuC to 3V3.

    P10: "PULSE SKIP" to "BURST".

    J2: jumper installed.

    P13 - P15: power buses connected either to 1v8 or 3v3, as described in scenarios above.

    DLDO_1V1_B to DLO_1V1

    DLDO_1V1_A to DLO_1V1

    P25: RESET_N

    P8: GND

    Dip-switch settings:

    S2: both off or both on depending on Vp-p signal setting as described in scenarios above.

    S3: P1_SWPD_EN_N on, P2_SWPD_EN_N off

    S1: SPI_CFG0 on, API_CFG1 off

    S4: 0 off, 1 on, 2 on, 3 off

    Let me know if I missed any of interest, or if you need more info!

  • Hi,

    I have reviewed the measurements we performed at the laboratory, and we did not find a significant difference in power consumption when the link is established but idle, and when the link is established and actively sending data. The difference is around 4 mW, and the reason for this is that even though there is no data being transmitted, there is activity on the link once it is established.

    The specification given in the datasheet is an average of the measurements we took, even though the typical value is 215 mW, we had units going up to ~230mW and some going down to ~190mW.

    Regarding the VDDIO at 1.8V not working, this voltage determines the voltage used on the digital interfaces of the ADIN2111. In this case it makes the SPI on the ADIN2111 to work on 1.8V. Can you please confirm if you changed the voltage on the microcontroller side to have the SPI working at 1.8V there as well?