nRF9160 ENABLE Pin Maximum Voltage Specification

RE: nRF9160 ENABLE Pin Maximum Voltage Specification

ketiljo — Wed, 26 Jun 2019 10:13:43 GMT

If the enable pin voltage exceeds VDD, you should use a series resistor to limit the current, 10k should be fine. Absolute max voltage is 7 V.

RE: nRF9160 ENABLE Pin Maximum Voltage Specification

Pertti Kasanen — Tue, 25 Jun 2019 15:13:24 GMT

I'm still not confident about what we can do and what we should not:

Variant 1: So if we use VDD=5.5V, we can safely use 5.5V for ENABLE?

Variant 2: If we use e.g. VDD=3.3V (from separate power management IC), can the ENABLE voltage be higher than the 3.3V VDD? Can we use a higher voltage (that could be 4.2V from a Li-Po or 5.0V from a USB?)

Variant 3: if we supply the nRF9160 from a Li-Po battery (=VDD range 3.0V-4.2V), could we still use a USB voltage 5.0V for ENABLE?

RE: nRF9160 ENABLE Pin Maximum Voltage Specification

ketiljo — Tue, 25 Jun 2019 13:42:21 GMT

The enable pin is referenced to VDD. Vih,min = 1.2 V and Vil,max = 0.4 V.