[NXP Rapid IoT Review] Standby current of Rapid IoT Studio online IDE generated projects

littleshrimp

[NXP Rapid IoT Review] Standby current of Rapid IoT Studio online IDE generated projects [Copy link]

I recently downloaded a project generated by Rapid IoT Studio online IDE to the development board. It runs out of power after a short time after it is fully charged. Today I removed the outer shell and measured the current at VCC3V2 (TP4) and VCC_BAT (TP5). After the program was run, the current at both locations was basically around 48mA (it is continuous and will not change due to reading sensors or updating the screen). It is impossible to use such a high current with battery power. The backlight is off and other modules are not processed. I did not find other low-power settings in Rapid IoT Studio online IDE. NXP is such a large manufacturer that these functions may not be tested when the module leaves the factory. Does anyone from the manufacturer know how to solve this low-power problem?

littleshrimp

If you add enter_vlls1() before the Init_all_sensors() function, the current will drop to about 28mA. If you add it after Init_all_sensors(), the current will not drop significantly.

cruelfox

I also want to measure the working current of this thing, but I didn't find a suitable place to start after looking at the board. The battery plug is too small, and I don't have a suitable connector. Did you bypass the LDO when measuring it this way?

littleshrimp

cruelfox posted on 2019-1-2 13:03 I also want to measure the working current of this thing. I looked at the board but didn't find a suitable place to start. The battery plug is too small and I don't have a suitable connector. You...

There are two through-hole pads next to the battery interface, which are GND and VCC_BAT. You can use flying wires and test them. There are too many devices on the board with high integration and high power consumption. The manufacturer does not provide a solution. It is very troublesome to find it yourself.