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Programming nRF52 at 1.8V ?

Hi All,

We received a new design with a nRF52 powered at 1.8V. We are using a JLINK probe with the SW protocol for the burnin code. When we apply 1.8V we can’t program / burn in our code, even by using your example code. But when we apply the power supply up to 3.3V we can program / burn in our code. Moreover the firmware is running at 1.8V

Does it possible to program the device at 1.8V?

Regards,

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0 AmbystomaLabs over 7 years ago

No product with cmos gpio can have communications when the sending unit has a significantly different gpio voltage.

Referring to the nRF product spec for gpio you will see that Vinput_low is max 0.3xVdd and Vinput_high is max Vdd (ie, 1.8V). The only way to program it is either run the nRF at 3-3.3V, use a level shifter to convert from 3.3 gpio to 1.8V gpio, or buy a SWD/Jlink with 1.8V logic.

Or, if you take the time to do the ohm's law calculations you could probably come up with a resistance configuration tied to 3.3v to effect a level shifter.
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0 AmbystomaLabs over 7 years ago

No product with cmos gpio can have communications when the sending unit has a significantly different gpio voltage.

Referring to the nRF product spec for gpio you will see that Vinput_low is max 0.3xVdd and Vinput_high is max Vdd (ie, 1.8V). The only way to program it is either run the nRF at 3-3.3V, use a level shifter to convert from 3.3 gpio to 1.8V gpio, or buy a SWD/Jlink with 1.8V logic.

Or, if you take the time to do the ohm's law calculations you could probably come up with a resistance configuration tied to 3.3v to effect a level shifter.
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