... should cause issues because I have basically two power inputs now by simply splitting the USB input? One routed to the onboard USB-C and one coming from the battery?
... best solution because data and power is separated?
Would be very thankful about feedback.
*one thing I want to change is to move the "PWR Switch" to the positive line connecting to the WT32-SC01 PLUS board. So that this way I can charge the battery with the device itself being turned off
... both can be used for power input "Extended IO Interface" as well as "RS485". For me the direction the RS485 is facing towards is beneficial for my case placement.
Just tracked this boost/charge board down and found the following, so no short circuit or over discharge protection.
For my most recent project, this could not be used as the completed only draw 20mA (by a lot of hard design)
USB Lithium Battery Charging Protection Board Type-C 5V 2A Boost Converter
Basic parameters
Input voltage range: 5-5.5V
Charging cut-off voltage: (4.2V/4.35V) ±0.5%:
Charging current: 2.4A±5%
Boost output voltage: 5V 5.15V (wire loss compensation)
Boost output voltage ripple: 100mV
Boost output current: 2A
Boost conversion efficiency: 92.5% (3.6V input, 5V2A Output)
Battery end quiescent current: 30uA
"Features
The output will be turned off when the load current is continuously less than 50mA.
Supports external buttons, connect the button to point K and the negative output, short press to turn on the power display and turn on the 5V output, and two short presses will turn off the power display and turn off the 5V output.
When the charging current drops to 100mA after reaching the final float voltage, the charging cycle will be automatically terminated.
When the battery voltage drops below 4.1V, the charging cycle restarts.
If the battery voltage is lower than 2.8V, the battery will be precharged with a current of 180mA.
The USB-A female socket welding position is provided on the back of the product, and the female socket can be manually installed.
Supports charging and discharging"
When using your project, will it be necessary to load the code several times?
Or only during development and some correction?
This pin K turn ON and OFF module +5V output.
" It supports the external key, which is connected to the K point and the output negative pole.
Short press to turn on the power display and turn on the 5V output. Two consecutive
short presses will turn off the power display and turn off the 5V output. "
If your battery looks like the one in the picture, it probably has protection circuits built in. If so, that charger/boost module would be all you need.
Edit: But to connect the USB data lines, you would need to plug USB into the processor's USB port if it has one. The charger module only uses the USB power lines.
" It supports the external key, which is connected to the K point and the output negative pole.
Short press to turn on the power display and turn on the 5V output. Two consecutive
short presses will turn off the power display and turn off the 5V output. "
Ah ok ... but it would basically be the same to have a physical switch between 5V booster and microcontroller like I planned?
Since I am not quite sure what happens when I connect both USB-C ports (one from the charger module and one from the microcontroller board) to one USB-C output port I have my final circuit like this:
Basically use magnetic charging for the battery. The USB-C port that I put on the case will lead to the USB-C from the microcontroller to flash the board. When I do that I disconnect the battery/module with the ON/OFF switch.
ATTENTION, the slots marked +5V are only module output, not input.
The module has one output in the slots and another in the USB type A connector.
But the module input is only through the microUSB connector.
The battery is only charged if the module is powered by the microUSB connector (pin 1 of IP5306).
See the module schematic below.
