[NXP Rapid IoT Review] + Preliminary Study on Power Consumption of Some Devices[Copy link]
This post was last edited by anananjjj on 2019-1-7 23:22 I plan to study application methods this weekend. Today, I took advantage of some time to test the power consumption of some devices. I originally planned to test the power consumption of Bluetooth, NFC and some sensors. However, after the last hardware schematic analysis, it can be seen that https://bbs.eeworld.com.cn/forum. ... &tid=1065947&extra=, after the Bluetooth module and sensor module are powered on, the default power supply mode cannot be shielded. From the schematic diagram, some so-called analog switches only control I2C to High Z mode:
Therefore, the Bluetooth and sensor off and on functions of the device, that is, software functions, cannot affect the changes in power consumption. The following figure is a complete normal device power consumption:
The power consumption when connected to USB is about 1.207W (4.93V, 0.245A) The last time I performed a programming test, I only turned on the LCD screen and backlight functions, and the power consumption was 0.820W
Therefore, when the other modules are in normal operation, the total power consumption is about 0.387W. After all, we cannot physically isolate each module, so this part is vague and uncertain! Next, let's remove the battery part and see how much power the charging circuit and the battery part consume:
Unplug the battery socket (PS. Mom no longer has to worry about shutting down after the battery is exhausted!), then restore and power on: At the beginning of the program startup:
The power consumption is very small, and the starting current has been rising continuously. After stabilization, it is as shown in the figure below: It can be observed that the power consumption has dropped to about 0.452W (4.97V, 0.091A)
By comparison, it can be obtained that the charging circuit and the battery part require a power consumption of 0.755W! Turn on the RGB LED and you get: 397200 The power consumption is 0.468W and the current has increased by 0.02A, so there is a certain increase in power consumption! Next, on this basis, remove the back cover and touch:
It is found that the power consumption has not changed significantly, and this part of the power consumption is indeed relatively small; Next, remove the LCD backlight (PS. Without backlight, there is no color!):
The power consumption continues to drop to 0.417W, and the backlight power consumption is 0.035W; Then remove the LCD screen cable and find that the power consumption is almost unchanged, and the power consumption of the LCD screen itself is not obvious:
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