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CC1310: Output level

Part Number: CC1310

Hi team,

Supply 1.9V. The power mode uses the internal DCDC mode.

The DIO5 is pulled high during the current test and the DIO level is found to be at 1.9V. There is a certain probability that the DIO level will only pull high to 1.44V during the repeated power-on breakpoint test. According to page 29 of the manual, the output voltage should be around 1.54V when supplying 1.8V.

1) Normally, the output level of the IO port should be related to its input level. Why is the DIO output level about 0.3 V lower than the input level?

2) If the output level is normal at 1.44V as per the manual, why is DIO pulled high to 1.9V? 

Could you help check this case? Thanks.

Best Regards,

Cherry

  • Hi,

    The output level of the IO port is typically VDDS - 0.3V

  • Note that the levels are given when the DIO is sourcing a given amount of current. The output stage is basically an inverter. The PMOS/ NMOS will be able to drive the output very close to the rails if the DIO is not loaded. When the current load increase, the output voltage will have a larger delta from the rail and if the load is too high the output will not a valid CMOS level. A different way to read the datasheet is how much current you can source from the DIO and still have a valid COMS level.