Vin ---- C1 ----+----+--------------------+----> VOUT | | | | IC1 D1 | (JYMC‑220BI) | | |--- SW (pin 3) ----+---|<---+ | | | | | L1 (integrated) | | | | | | +----+--- GND ---------+----------+ | | C3 C2 | | GND GND
+5V/12-24V DC IN │ ▼ [Voltage Regulator (3.3V)] ──▶ Logic VDD │ ▼ [STEP + DIR + UART RX/TX] ──▶ [TMC2209-like ASIC] │ │ ▼ ▼ [Charge Pump / Gate Driver] ◀── [Sense Resistors] │ ▼ [Power MOSFETs H-Bridge] ──▶ Motor Coils A+/A-, B+/B- │ ▼ [Current Sense / Overcurrent Protection] jymc220bi schematic full
Because "JY" usually refers to the manufacturer (Jingyi / JY-LCM) and specific schematics for these generic "eBay/AliExpress modules" are rarely officially published, this article reconstructs the based on the standard application circuit for the ILI9225 driver and the typical PCB layout found on these modules. Vin ---- C1 ----+----+--------------------+---->