I am using the OM23221ARD: NTAG I2C plus kit with a FRDM-KW41Z board. According to the pinout, the NFC energy-harvesting output VOUT is routed to the P5-9VIN pin on the KW41Z Arduino header. As the output voltage from the NFC energy harvesting pin on the I2C antenna is likely to be in the region of 2.7v, that would seem to be insufficient to power the KW41Z via the P5-9VIN pin. Am I right, or is there a way of powering the KW41Z via the I2C plus shield?
I know that I AM able to power the KW41Z board from the I2C antenna if I connect VOUT to J18 and set J23 accordingly but that requires an extra wire from the I2C board.
Hello,
You could connect the Vout to the MCU and power it but, do you want to power the complete board? Also, how will you generate the field? Will it be with a phone??
Please consider that there is a limit of the power delivered by the NTAG I2C, in ideal conditions the energy harvesting feature delivers up to 15 mW out of NFC field to power (parts of) host system, but it will depend on how you will generate the field and the system. For more details about this, please check the datasheet and this application note.
Regards,
Estephania
My question is not how to power the board but whether you could ever power the KW41Z board with 2.7v max into the P5-9VIN pin since that pin is the input to a low dropout regulator and requires at least 5v.
Hello,
No, that pin it's from 5 to 9
The FRDM-KW41Z can be powered by the following means:
Regards,
Estephania