WCH CH32M030K9U7

The boost module of the CH32M030K9U contains a two-stage charge pump. The first-stage charge pump is driven by the push-pull output of PB14 and requires an external capacitor C1; the second-stage charge pump is driven by the push-pull output of PB12 and requires an external capacitor C2. The boosted voltage V_HVCP, equivalent to V_HV plus twice V_DD5, is output from the HVCP pin and requires an external energy-storage capacitor C3. The device provides five high-voltage open-drain output pins — PB7, PB9, PB11, PB13, and PB15 — supporting the V_HVCP voltage range. Among these, PB9, PB11, PB13, and PB15 each feature two-level open-drain output drive capability: one level is standard drive, and the other is current-limited drive with an internal series resistor, which can be used in combination with an external pull-up resistor to generate a non-full-swing voltage output.

• Controls external N-type MOSFET power transistor
• Generates divided voltage output to reduce external drive voltage
• Dynamically selects matched gate voltage to optimize power transistor on-resistance