CH552E

@@ -0,0 +1,53 @@+# CH552E++**WCH Jiangsu Qin Heng** · Microcontrollers (MCU/MPU/SOC) · MSOP-10++CH552E from WCH Jiangsu Qin Heng, in a MSOP-10. Pinout and pin descriptions extracted from the manufacturer datasheet by ds2sf; symbol, footprint, and 3D from KiCad-official CAD.++## Pinout++| Pin | Name | Type | Function |+|---|---|---|---|+| 1 | P1.4/T2_/CAP1_/SCS/TIN2/UCC1/AIN1 | bidirectional | Port 1 bit 4 general-purpose I/O with internal pull-up by default. Muxed alternate functions: Timer 2 external count input (T2_ inverted mapping), Timer 2 capture 1 input (CAP1_), SPI0 slave chip-select (SCS), Touch-Key channel TIN2 input, USB type-C configuration channel UCC1, and ADC channel AIN1 analog input. |+| 2 | P1.5/MOSI/PWM1/TIN3/UCC2/AIN2 | bidirectional | Port 1 bit 5 general-purpose I/O with internal pull-up by default. Muxed alternate functions: SPI0 MOSI (master output / slave input), PWM1 output, Touch-Key channel TIN3, USB type-C configuration channel UCC2, and ADC channel AIN2 analog input. |+| 3 | P1.6/MISO/RXD1/TIN4 | bidirectional | Port 1 bit 6 general-purpose I/O with internal pull-up by default. Muxed alternate functions: SPI0 MISO (master input / slave output), UART1 serial data receive (RXD1), and Touch-Key channel TIN4. |+| 4 | P1.7/SCK/TXD1/TIN5 | bidirectional | Port 1 bit 7 general-purpose I/O with internal pull-up by default. Muxed alternate functions: SPI0 serial clock (SCK), UART1 serial data transmit (TXD1), and Touch-Key channel TIN5. |+| 5 | RST/T2EX/CAP2_ | input | External reset input, active high. Internal pull-down resistor on RST. Alternate functions: Timer 2 reload / capture trigger input (T2EX) and Timer 2 capture 2 input (CAP2_ alternate mapping). |+| 6 | P3.6/UDP | bidirectional | Port 3 bit 6 general-purpose I/O; alternate function is the USB D+ (UDP) signal. When used as USB, no external series resistor is allowed. P3.6 uses V33 as its I/O supply, so digital high level is limited to V33 and does not support 5V logic. |+| 7 | P3.7/UDM | bidirectional | Port 3 bit 7 general-purpose I/O; alternate function is the USB D− (UDM) signal. When used as USB, no external series resistor is allowed. P3.7 uses V33 as its I/O supply, so digital high level is limited to V33 and does not support 5V logic. |+| 8 | GND | power_in | Common ground (VSS) return for the chip. |+| 9 | VCC | power_in | Main power supply input (VDD), 3.3 V or 5 V. Requires an external 0.1 µF decoupling capacitor to GND placed close to the pin. |+| 10 | V33 | power_in | Internal USB LDO regulator output and internal USB supply input. When VCC < 3.6 V, tie V33 to VCC externally. When VCC > 3.6 V (5 V operation), connect a 0.1 µF decoupling capacitor from V33 to GND and let the internal LDO produce 3.3 V. |++## Key specifications++| Parameter | Value |+|---|---|+| Manufacturer | WCH Jiangsu Qin Heng |+| Package | MSOP-10 |+| Category | MCU |+| Pins | 10 |++## Ordering variants++- `CH552E`+- `CH552ECH552T`+- `CH552ECH552G`+- `CH552ECH552P`++## CAD (KiCad official)++- Symbol: `CH552E`+- Footprint: `Package_SO:MSOP-10_3x3mm_P0.5mm`+- 3D model: MSOP-10 (KiCad packages3D, STEP)++## Provenance++Data extracted from the manufacturer datasheet, not a distributor listing:++- **Datasheet:** [WCH Jiangsu Qin Heng datasheet](docs/ch552e-datasheet.pdf) (53 pp, sha256 `b3995c47a6c00a9f`, retrieved 2026-08-17, tier: lcsc)+- **Datasheet language:** Chinese. Pin names, descriptions, and specs on this page were extracted and translated to English by ds2sf; the linked PDF is the manufacturer original.+- **Extractor:** `ds2sf` (Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate.+- **CAD:** KiCad official libraries (CC-BY-SA 4.0).++[Datasheet PDF](docs/ch552e-datasheet.pdf)

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