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sre avatar sre commented on September 26, 2024

The purpose of J4 is supplying the CFF with power, so yes VCC on J3 and J4 are the same. With R8 soldered in you should remove the battery from the CFF. Then J3 should be supplied with 3.3V on the Vcc pin. Don't apply 5V, since that can fry the MRF89XA on the CFF (it is only specified for up to 3.6V).

from cff3000-pcb.

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