CH376S

@@ -0,0 +1,68 @@+# CH376S++**WCH Jiangsu Qin Heng** · USB Converters · SOP-28-300mil++CH376S from WCH Jiangsu Qin Heng, in a SOP-28-300mil. 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 | INT# | output | Interrupt request output to the MCU, active low, with built-in pull-up resistor. Signals events such as USB connect/disconnect, command completion, or file-system status. |+| 2 | RSTI | input | External hardware reset input, active low, with built-in pull-down resistor. Tie high or leave floating for normal operation; pull low to force a hardware reset. |+| 3 | WR# | input | Write strobe input of the 8-bit passive parallel port, active low, with built-in pull-up resistor. Latches data on the D0-D7 bus into CH376 when PCS# is asserted. |+| 4 | RD# | input | Read strobe input of the 8-bit passive parallel port, active low, with built-in pull-up resistor. Drives the D0-D7 bus with CH376 output data when PCS# is asserted. |+| 5 | TXD | bidirectional | Dual-function pin: interface-mode selection input during power-on reset (with internal pull-up), then serial data output of the asynchronous UART after reset. |+| 6 | RXD | input | Serial data input of the asynchronous UART, with built-in pull-up resistor. Idle-high; receives serial commands from the MCU at up to 3 Mbps. |+| 7 | SD_DI | input | SD-card SPI host MISO input (data from SD card to CH376), with built-in pull-up resistor. Sampled by CH376 on the SD_CK edge. |+| 8 | A0 | input | Parallel-port address input with built-in pull-up resistor. A0=1 selects the command/status register, A0=0 selects the data register. |+| 9 | V3 | power_in | 3.3 V core rail. Tie directly to VCC when powered from 3.3 V; add an external 0.01 uF decoupling capacitor when VCC is 5 V (built-in LDO supplies the core). |+| 10 | UD+ | bidirectional | USB bus D+ data line. Connects directly to the USB connector D+ pin; no external series resistor is required. |+| 11 | UD- | bidirectional | USB bus D- data line. Connects directly to the USB connector D- pin; no external series resistor is required. |+| 12 | GND | power_in | Common ground reference. Must be tied to the USB bus ground and to the local system ground. |+| 13 | XI | input | Crystal oscillator input. Connect an external 12 MHz crystal between XI and XO with the standard load capacitors to ground. |+| 14 | XO | output | Inverted crystal oscillator output. Connect an external 12 MHz crystal between XI and XO with the standard load capacitors to ground. |+| 15 | D0 | bidirectional | Bit 0 of the 8-bit bidirectional parallel data bus, three-state, with built-in pull-up resistor. Driven by CH376 during reads and by the MCU during writes. |+| 16 | D1 | bidirectional | Bit 1 of the 8-bit bidirectional parallel data bus, three-state, with built-in pull-up resistor. |+| 17 | D2 | bidirectional | Bit 2 of the 8-bit bidirectional parallel data bus, three-state, with built-in pull-up resistor. |+| 18 | SCS/D3 | bidirectional | Muxed pin. In SPI slave mode: SPI chip-select input, active low, with built-in pull-up resistor. In parallel mode: bit 3 of the D0-D7 bus. |+| 19 | BZ/D4 | bidirectional | Muxed pin. In SPI slave mode: BZ busy-status output, active high, indicating CH376 is processing. In parallel mode: bit 4 of the D0-D7 bus. |+| 20 | SCK/D5 | bidirectional | Muxed pin. In SPI slave mode: SPI serial clock input, with built-in pull-up resistor. In parallel mode: bit 5 of the D0-D7 bus. |+| 21 | SDI/D6 | bidirectional | Muxed pin. In SPI slave mode: SPI MOSI serial data input, with built-in pull-up resistor. In parallel mode: bit 6 of the D0-D7 bus. |+| 22 | SDO/D7 | bidirectional | Muxed pin. In SPI slave mode: SPI MISO serial data output, three-state (may also serve as an interrupt output via CMD_SET_SDO_INT). In parallel mode: bit 7 of the D0-D7 bus. |+| 23 | SD_CS | output | SD-card SPI host chip-select output, open-drain, active low, with built-in pull-up resistor. Drives the CS pin of the attached SD/MMC/TF card. |+| 24 | ACT# | output | Open-drain status output, active low, with built-in pull-up resistor. Indicates USB-device connection in host mode, SD-card SPI transfer success in SD host mode, or completion of USB-device configuration in device mode with built-in firmware. Typically drives an activity LED. |+| 25 | SD_DO/RST | output | Muxed pin. Before SD-card mode is entered: RST power-on reset output, active high, usable to reset the external MCU. After SD-card mode is entered: SD_DO SPI-host serial data output (MOSI) to the SD card. |+| 26 | SD_CK | output | SD-card SPI host serial clock output. Drives the SCLK pin of the attached SD/MMC/TF card at up to 6 MHz. |+| 27 | PCS# | input | Parallel-port chip-select input, active low, with built-in pull-up resistor. Enables the 8-bit passive parallel interface when asserted. |+| 28 | VCC | power_in | Positive supply input, nominally 5 V, 3.3 V, or 3 V. Requires an external 0.1 uF decoupling capacitor placed close to the pin. |++## Key specifications++| Parameter | Value |+|---|---|+| Manufacturer | WCH Jiangsu Qin Heng |+| Package | SOP-28-300mil |+| Category | Interface |+| Pins | 28 |++## Ordering variants++- `CH376S`+- `CH376SCH376T`++## CAD (KiCad official)++- Symbol: `CH376S`+- Footprint: `Package_SO:SOP-28_8.4x18.16mm_P1.27mm`+- 3D model: SOP-28-300mil (KiCad packages3D, STEP)++## Provenance++Data extracted from the manufacturer datasheet, not a distributor listing:++- **Datasheet:** [WCH Jiangsu Qin Heng datasheet](docs/ch376s-datasheet.pdf) (34 pp, sha256 `a5b56270d8a36d93`, retrieved 2026-08-17, tier: lcsc)+- **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/ch376s-datasheet.pdf)

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