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TMDSEMU110-U: TMDSEMU110-U & TMDSEMU110-ETH Connectivity and Measurements on a subsystem power supplied by external source

Alberto Gentile Cina
Prodigy 10 points
Part Number: TMDSEMU110-U
Other Parts Discussed in Thread: ENERGYTRACE

Hi everybody.

I want to make real-time current consumption measurements on an NB-IoT module of u-blox company. Its current consumption varies in function of the state of the module, and it can take from 3 µA (sleep mode)  to 270 mA maximum (active mode). Here is where the measurement is made : 

This module is powered by an external source, and its input voltage is typically 3.8V with minimum input 3.2V and maximum 4.2V. Eventually, it is possible to make the measurements with an external DC power supplier with current consumption measurement capabilities.

In order to make the current consumption measurement I would like to use the XDS110 Debug Probe + XDS110 Energy Trace HDR system as it supports the current range I need to observe (from 1 µA to 800 mA). 

According to the datasheet of the XDS110 EnergyTrace HDR Debug Probe Add-On user's guide, it is possible to connect to the target device via different ways, for example through the GPIO connectivity, as shown right below here :

 

My concern is that I am not sure whether it would be possible to make the connection to my NB-IoT module. I will only need to use Energy Trace in standalone mode and not in debug mode, thus I was wondering if only by using the GPIO the measurements would be successful. In fact, the module does not present any JTAG interface and I would like to keep the external power source for the target device, without having to power the target through the XDS110. 

Thanks for your support and do not hesitate to ask for additional information.

Best regards,

Alberto

  • 0
    TI__Guru**** 159715 points

    Alberto,

    In the diagram the UART/POWER/GPIO label is showing that these connections are happening via the Target auxiliary Connection. That is done using the little breakout board that comes with the unit.

    Alberto Gentile Cina said:
    I will only need to use Energy Trace in standalone mode and not in debug mode, thus I was wondering if only by using the GPIO the measurements would be successful. In fact, the module does not present any JTAG interface and I would like to keep the external power source for the target device, without having to power the target through the XDS110. 

    In order for EnergyTrace to work the XDS110/HDR needs to be supplying power to the target.

    Regards,

    John