Electrical characteristics

Power supply

The modules power supply is 3.3 V (+/- 0.1V)

Power consumption

Power consumption depends on the configuration:

Base Board and WLAN Trailor: 280 mA (at 3.3V) with no power save activated

Base Board and WLAN Trailor: 90 mA (at 3.3V) with power save activated.

Base Board and SD Trailor: 90 mA (at 3.3V)

Signal level

Output signal levels are 3,3V (precisely: Vcc - 0.4V). Maximum output current is 4 mA. The short-circuit current is 45 mA (only for short period of time. Short circuit will damage the output driver).

Input signal levels can be 3,3V - 5V - thus a mixed voltage (3.3/5V) PCB is straight forward since no signals needs to be converted. An input draws 3µA at high and at low level. A high level is defined for voltages above 2V, a low signal is smaller than 0.8 V.

Power considerations for the Real Time Clock

The V_BAT supply range to power the Real Time Clock is 2.0V to 4.6V. Recommended operating range is 2.4V to 3.6V. Typically, RTC fails when voltage drops below 1.6V.

Power consumption of the Real Time Clock at V_BAT is 20µA.

There is a reported issue with the real time clock power consumption. See here  for details provided by NXP. In real life, this is not an issue - just during production.