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Original question:

TPS6594EVM: EVM Not Working

TPS6594EVM: TPS65941212EVM Not Working

AB
Prodigy 50 points
Part Number: TPS6594EVM

Hello Ti Team,

We are seeking for support, in order to detect devices on the GUI.

The first problem is that the GUI doesn't detect devices from the EVM and show this error: "Connected to AEVM Controller, but failed to connect to device TPSG694x_2p0_external on DUTWITHI2C @0x48"

- V3V3 and V_SYS are connected on J15, the card is powered by USB, moreover D4, D5,D6 are on, whereas D3 is off.

 - We measure VCCA, we get 0V. -> PMIC doesn't answer on the I2C bus because of this, right ?

- On J15, pin 6 VSYS_SENSE, we get 0V. -> We think that VCCA is at 0V because of this.

- Testing on R21, we get 3.3V

- Testing on R39, we get 5V (very weird). But we suspect that R39 is maybe wrong named because it's placed far from R20 and R21.

   R39 measured 0R, so the part is ok.

- There is none R27, on the board.

Thank you in advance for your help,

AB

  • 0
    TI__Expert 4480 points

    Hi AB,

    Could you confirm that the jumpers on J37 and J47 are connecting pins 2 and 3, meaning they are set to the Master configuration? The TPS65941212EVM is intended to be used in a stack with the TPS65941111EVM, where the TPS65941212EVM is configured as a Master device, and the TPS65941111EVM is configured as a Slave device. 

    The master configuration on J37 allows for the EVM to control the ENABLE signal, while the slave configuration on J37 allows the ENABLE signal to be controlled externally by the master device. If your TPS65941212EVM has J37 set to the slave configuration, this would be why your EN_DRV LED (D3) is off. The master configuration on J47 connects the 3.3 V and 5 V regulators on the device to the USB connection (+VBUS). If your EVM has J47 set to the slave configuration, this would be why your VSYS_SENSE is also measuring 0V. Were you also measuring 0V on V3V3 and VSYS?

    Regards,
    Megan