Jymc220bi Schematic 2021 — Extended

The 2021 board revisions feature several potentiometers for fine-tuning performance: Sets the maximum motor speed. Adjusts the minimum speed (threshold).

Through trial and error, repair forums found that the 2021 output voltage follows: jymc220bi schematic 2021

| Pin | Name | Function in 2021 Rev | |-----|----------|-----------------------------------------------| | 1 | BAT | Battery positive (direct connection) | | 2 | GND | Power ground | | 3 | CHRG | Open-drain charge indicator (active low) | | 4 | FULL | Open-drain full indicator | | 5 | KEY1 | Single button input (pull-up internal) | | 6 | LED1-4 | Multiplexed LED outputs (sink current) | | 7 | SW | Inductor pin for boost converter (to 2.2µH) | | 8 | VOUT | 5V boosted output | | 9 | ISET | Charge current set (resistor to GND) | | 10 | NTC | Battery thermistor input (10k NTC typical) | The 2021 board revisions feature several potentiometers for