RE: nRF9151 DEC0 capacitance

Bendik Heiskel — Thu, 23 Jul 2026 06:53:08 GMT

Hi,

The capacitor on DEC0 must be 4.7uF, as this is a decoupling for the internal regulator, not following the values in the reference design will result in unexpected behavior.

[quote user=""]Power was provided by a 50mA current limited 4.2V supply through the VBAT pin of the nPM1300 (which also provides a regulated 1.8V for the VDD_GPIO domain), which passes that out through VSYS and to VDD of the nRF9151. [/quote]

50mA supply for to the nRF9151 is not enough, the maximum current draw of the nRF9151 is close to 500mA(worst case, transmitting at maximum output power) so a 50mA supply will result in the nRF9151 resetting due to the voltage dropping on the VDD net.

Best regards,

Bendik