ch376t

@@ -0,0 +1,60 @@+# CH376T++**WCH Jiangsu Qin Heng** · USB Converters · SSOP-20-208mil++CH376T from WCH Jiangsu Qin Heng, in a SSOP-20-208mil. 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, active low, built-in pull-up resistor. Asserted to notify the MCU of USB/SD/file-system events (device connect, transfer complete, etc.). |+| 2 | RSTI | input | External reset input, active low, built-in pull-down resistor. Drive low to force a hardware reset of the chip. |+| 3 | SPI# | input | Interface-mode configuration input latched during chip internal reset, built-in pull-up resistor. Selects between SPI device interface (low at reset) and UART serial interface (high at reset) for MCU communication. |+| 4 | TXD | bidirectional | Dual-function pin: at chip internal reset it acts as an interface-configuration strap input (built-in pull-up); after reset it is the asynchronous serial (UART) transmit data output. |+| 5 | RXD | input | Asynchronous serial (UART) receive data input, built-in pull-up resistor. Baud rate is programmable up to 3 Mbps via the SET_BAUDRATE command. |+| 6 | SD_DI | input | Serial data input of the SD card SPI host interface (data from SD card to CH376), built-in pull-up resistor. |+| 7 | V3 | power_in | Internal 3.3 V regulator node. Tie to VCC when operating at 3.3 V supply; connect an external 0.01 uF decoupling capacitor when operating at 5 V supply. |+| 8 | UD+ | bidirectional | USB bus D+ data line. Connects directly to the USB connector D+ pin (host or device mode). |+| 9 | UD- | bidirectional | USB bus D- data line. Connects directly to the USB connector D- pin (host or device mode). |+| 10 | GND | power_in | Common ground reference; must be tied to the ground wire of the USB bus. |+| 11 | XI | input | Crystal oscillator input terminal. Connect a 12 MHz crystal (with the usual load capacitors) between XI and XO. |+| 12 | XO | output | Inverted crystal oscillator output terminal. Connect a 12 MHz crystal between XI and XO. |+| 13 | SCS | input | SPI device interface chip-select input from the MCU, active low, built-in pull-up resistor. |+| 14 | SCK | input | SPI device interface serial clock input from the MCU, built-in pull-up resistor. Supports SPI rates up to 24 MHz. |+| 15 | SDI | input | SPI device interface serial data input (MOSI) from the MCU, built-in pull-up resistor. |+| 16 | SDO | tri_state | SPI device interface serial data output (MISO) to the MCU. Three-state output; high-impedance when SCS is deasserted. |+| 17 | SD_CS | output | SD card SPI host interface chip-select output, active low, open-drain with built-in pull-up resistor. |+| 18 | SD_DO/RST | output | Dual-function pin. In SD card mode it is the SPI serial data output (SD_DO, data from CH376 to SD card). Before entering SD card mode it acts as a power-on/external reset output (RST), active high. |+| 19 | SD_CK | output | SD card SPI host interface serial clock output (up to 6 MHz). |+| 20 | VCC | power_in | Positive power supply input. Supports 5 V, 3.3 V, or 3 V operation; requires an external 0.1 uF decoupling capacitor to GND. |++## Key specifications++| Parameter | Value |+|---|---|+| Manufacturer | WCH Jiangsu Qin Heng |+| Package | SSOP-20-208mil |+| Category | Interface |+| Pins | 20 |++## Ordering variants++- `CH376T`+- `CH376TCH376S`++## CAD (KiCad official)++- Symbol: `CH376T`+- Footprint: `Package_SO:SSOP-20_5.3x7.2mm_P0.65mm`+- 3D model: SSOP-20-208mil (KiCad packages3D, STEP)++## Provenance++Data extracted from the manufacturer datasheet, not a distributor listing:++- **Datasheet:** [WCH Jiangsu Qin Heng datasheet](docs/ch376t-datasheet.pdf) (None 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/ch376t-datasheet.pdf)

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