- USB Type C - On the edge of the board is the USB Type C connector. It has 5.1k CC resistors so it will work with any computer or power supply to get 5V and up to 1A.
- VIN - This is the solar panel or DC power input to the bq25185. Connect a 5 to 18V power supply. If the input is a solar panel, the charging chip will adjust the current draw so that the voltage does not dip below the battery, thus optimizing the solar power input.
- VU - This is the power input from the USB connector.
- G - common ground.
At the top of the board is the JST battery connector. By default, the output is 3.7V nominal / 4.2V max battery chemistry/voltage for all modern 1-cell LiPoly or LiIon batteries with a default charge rate of 1A.
This output is available on the bottom of the board as well, labeled BAT on the board silk. You can use this secondary output to monitor the voltage on the battery with a multimeter.
- - - This is common ground.
- + - This is the regulated 5V output from the separate buck converter. It takes the load output from the bq25185 and switches it to 5V at 1 Amp max load. This output is available on the bottom of the board as well, labeled 5V on the board silk.
Note the TP61023 cannot turn on/off high loads; it will stall over 200mA. That means it's not going to like it if you have a high current load that instantly draws full current on power up, like a resistive dummy load. The vast number of microcontroller projects will start up with <200mA and then a half second later will turn on high current items like LEDs, motors, WiFi/radios, or displays so the restriction won't affect it.
- EN - This is the enable pad for the 5V output from the boost converter. Bring this pin low to disable the 5V output.
On the back of the board is the charge rate jumper. You can cut this jumper to change the charge rate from 1A to 500mA.
- 5V Output LED - In the bottom right corner of the board, below the terminal block, is the 5V output LED. It is the green LED. It will be lit if the 5V output is enabled.
- Charge LED - In the top left corner of the board is the charge status LED. It is the orange LED. It is labeled C on the board silk. It will be lit while a battery is charging.
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Fault LED - Directly below the charge status LED is the fault status LED. It is the red LED. It is labeled F on the board silk. It will be lit if the board experiences a fault condition. The bq25185 has integrated fault protection for a few conditions:
- Input overvoltage protection
- Battery undervoltage protection
- Battery short protection
- Battery overcurrent protection
- Input current limit protection
- Thermal regulation and thermal shutdown
- Battery thermal fault protection
- Safety timer fault
- ISET and ILIM/VSET pin short/open protection.
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