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UCD90160 - pin assignment for current and temperature

JulianE
Prodigy 170 points
Other Parts Discussed in Thread: UCD90160, UCD90120, INA197, UCD9090

Hello,

i am using the UCD90160 to monitor eight voltages and their currents. I am using shunt resistors and INA197 OpAmp to measure current scaled to 2.5V max. input voltage for the UCD90xxx ADC. Why is the current and temperature assignment on the Pin Assignment tab in Fusion Digital Power Manager Software not available for UCD90160 device? Starting a project with the UCD90120 showed that the current and temperature assignment options are available for that device.

Are there any main functional differences between the UCD90120 and the UCD90160? I couldnt find any on the datasheets.

  • 0
    TI__Genius 9845 points
    Hello Julian,
    The UCD90160 device was not designed to have current/temperature sensing capability. That is the reason why GUI does not read current and temperature.
    Thanks,Zhiyuan
  • 0
    TI__Genius 13700 points
    Unfortunately, we do not have a UCD90xxx sequencer that will support monitoring 8 voltages and 8 currents in a single device. The UCD90160 was developed to monitor 16 voltage rails only, it does not support current or temperature measurements. To acheive 8 voltage and 8 current measurements your best option would be to use two UCD9090 sequencers. If you have already commited to the UCD90160, it could be fooled into monitoring the current values but they would need to be entered into the Fusion GUI as if they were voltage rails without enables. You would not have the same fault monitoring capabilities as you would with two UCD9090s and accessing the current monitoring would use the READ_VOUT command. And you could attempt to format the scaling for the current measurements to provide an output that might be reasonably easy to evaluate.
  • 0 in reply to Brad
    Prodigy 170 points

    Thanks for your explanations. But if you say: "You would not have the same fault monitoring capabilities as you would with two UCD9090s", where are the differences? Maybe i could live with using the READ_VOUT command and use scaling formats for current measurement, this are the main drawbacks?