component
CH9111L
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WCH(Jiangsu Qin Heng) USB Converters, LQFP-48(7x7). Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
3D Model
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Symbol & Footprint
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Datasheet
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README
markdownCH9111L
WCH(Jiangsu Qin Heng) · USB Converters · LQFP-48(7x7)
CH9111L from WCH(Jiangsu Qin Heng), in a LQFP-48(7x7). Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.
Pinout
| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | XI | input | Crystal oscillator input; an external 24MHz clock or crystal (with XO) is required for normal operation, and tying XI to GND selects the internal clock. |
| 2 | XO | output | Crystal oscillator inverting output, connected to a 24MHz crystal between XI and XO (chip has 12pF built-in load capacitance). |
| 3 | VDD33 | power_in | 3.3V positive supply input (3.0V to 3.6V) that needs decoupling; when VDD5 is below 3.6V it is tied to VDD5 with external 3.3V supply, and when VDD5 is above 3.6V it is driven by the internal regulator and needs 4.7uF plus 0.1uF decoupling. |
| 4 | GND | power_in | Common ground, must be connected to the USB bus ground. |
| 5 | NC | unconnected | No connection; leave floating. |
| 6 | UD- | bidirectional | USB D- data line connected directly to the USB bus; no series resistor may be added. |
| 7 | UD+ | bidirectional | USB D+ data line connected directly to the USB bus; no series resistor may be added. |
| 8 | NC | unconnected | No connection; leave floating. |
| 9 | GND | power_in | Common ground, must be connected to the USB bus ground. |
| 10 | GND | power_in | Common ground, must be connected to the USB bus ground. |
| 11 | GND | power_in | Common ground, must be connected to the USB bus ground. |
| 12 | NC | unconnected | No connection; leave floating. |
| 13 | TXD0 | output | UART0 serial data output, idle high. |
| 14 | RXD0 | input | UART0 serial data input with built-in pull-up resistor (idle high). |
| 15 | RTS0/GPIO0 | bidirectional | UART0 RTS modem output, active low, also general-purpose GPIO0; if an external pull-down is detected at power-up, the internal EEPROM parameters are disabled and default chip parameters are used. |
| 16 | CTS0/GPIO1 | bidirectional | UART0 CTS modem input, active low (used for hardware flow control when enabled), also general-purpose GPIO1. |
| 17 | DTR0/GPIO2 | bidirectional | UART0 DTR modem output, active low, also general-purpose GPIO2. |
| 18 | DSR0/GPIO3 | bidirectional | UART0 DSR modem input, active low, also general-purpose GPIO3. |
| 19 | DCD0/GPIO4 | bidirectional | UART0 DCD modem input (carrier detect), active low, also general-purpose GPIO4. |
| 20 | RI0/GPIO5 | bidirectional | UART0 RI modem input (ring indicator), active low, also general-purpose GPIO5. |
| 21 | TNOW0/GPIO6 | bidirectional | UART0 RS485 transmit/receive control pin (TX now status), also general-purpose GPIO6. |
| 22 | GND | power_in | Common ground, must be connected to the USB bus ground. |
| 23 | GND | power_in | Common ground, must be connected to the USB bus ground. |
| 24 | VIO | power_in | I/O supply input for all non-USB pins, 3.3V, 2.5V, 1.8V or 1.2V (1.1V to 3.6V per electrical table), with 0.1uF or 1uF capacitor and should share supply with the SPI host and serial peripheral. |
| 25 | GPIO7/RX_S2 | bidirectional | Mode 0: general-purpose GPIO7; Mode 1: serial receive status output (RX_S2) pulsing for 200ms while data is being received. |
| 26 | GPIO8/TX_S2 | bidirectional | Mode 0: general-purpose GPIO8; Mode 1: serial transmit status output (TX_S2) pulsing for 200ms while data is being sent. |
| 27 | RX_S/SCS | bidirectional | 5V-tolerant pin; Mode 0: serial receive status output (RX_S); Mode 1: SPI chip select input (SCS). |
| 28 | TX_S/SCK | bidirectional | 5V-tolerant pin; Mode 0: serial transmit status output (TX_S); Mode 1: SPI clock input (SCK, alias DCK), supporting SPI mode 0 or mode 3 up to 40MHz. |
| 29 | GPIO9/MISO | bidirectional | 5V-tolerant pin; Mode 0: general-purpose GPIO9; Mode 1: SPI data output (MISO, alias DOUT or SDO). |
| 30 | GPIO10/MOSI | bidirectional | 5V-tolerant pin with built-in pull-up; Mode 0: general-purpose GPIO10; Mode 1: SPI data input (MOSI, alias DIN or SDI). |
| 31 | PWR_DET | input | 5V-tolerant USB VBUS state detection input with built-in pull-down resistor. |
| 32 | ACT | output | USB configuration complete status output, active low; high at power-up until the USB host configures the device. |
| 33 | SUSP | output | USB suspend status output, active low; high during normal operation and low when suspended. |
| 34 | RESET | input | External reset input, active low, with built-in pull-up resistor; reset delay is 15 to 45 ms after power-up or external reset. |
| 35 | GND | power_in | Common ground, must be connected to the USB bus ground. |
| 36 | GND | power_in | Common ground, must be connected to the USB bus ground. |
| 37 | NC | unconnected | No connection; leave floating. |
| 38 | VDDK | power_in | Core power supply pin; connect at least 0.1uF decoupling capacitor, 1uF recommended. |
| 39 | NC | unconnected | No connection; leave floating. |
| 40 | VDD5 | power_in | 5V positive supply input (4.0V to 5.25V) that needs decoupling capacitor; feeds the internal regulator that generates VDD33 when above 4.0V. |
| 41 | GND | power_in | Common ground, must be connected to the USB bus ground. |
| 42 | NC | unconnected | No connection; leave floating. |
| 43 | CFG0/GPIO11/RDNE | bidirectional | 5V-tolerant configuration pin 0; if an external pull-down is present at power-up, hardware flow control is enabled; Mode 0: general-purpose GPIO11; Mode 1: SPI TX FIFO not-empty output (RDNE), low when data can be read. |
| 44 | CFG1/GPIO12/WRNF | bidirectional | 5V-tolerant configuration pin 1; a pull-down at power-up enables Mode 1, otherwise Mode 0; Mode 0: general-purpose GPIO12; Mode 1: SPI RX FIFO not-full output (WRNF), low when space is available for writing. |
| 45 | CFG2/GPIO13/RWS | bidirectional | 5V-tolerant configuration pin 2; Mode 0: general-purpose GPIO13; Mode 1: SPI read/write status input (RWS), low for read and high for write. |
| 46 | VIO | power_in | I/O supply input for all non-USB pins, 3.3V, 2.5V, 1.8V or 1.2V, with 0.1uF or 1uF capacitor. |
| 47 | GND | power_in | Common ground, must be connected to the USB bus ground. |
| 48 | GND | power_in | Common ground, must be connected to the USB bus ground. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | WCH(Jiangsu Qin Heng) |
| Package | LQFP-48(7x7) |
| Category | Interface |
| Pins | 48 |
Electrical characteristics
Limits as printed in the datasheet (page.json metadata.characteristics carries them as data).
| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| 工作时的环境温度 Operating ambient temperature (TA) | TA | -40 | 85 | ℃ | 7 | ||
| 储存时的环境温度 Storage ambient temperature (TS) | TS | -40 | 105 | ℃ | 7 | ||
| 工作电源电压 VDD5 supply voltage (VDD5-GND) | VDD5-GND | -0.4 | 5.5 | V | 7 | ||
| 工作电源电压 VDD33 supply voltage (VDD33-GND) | VDD33-GND | -0.4 | 4 | V | 8 | ||
| I/O 电源电压 VIO supply voltage (VIO-GND) | VIO-GND | -0.4 | 4 | V | 8 | ||
| USB 信号引脚上的电压 Voltage on USB signal pins (VUSB) | VUSB | -0.4 | V | Printed max is VDD33+0.4; not a numeric limit | 8 | ||
| 耐受 5V 的 I/O 引脚上的电压 Voltage on 5V-tolerant I/O pins (VIO5V) | VIO5V | -0.4 | 5.5 | V | 8 | ||
| 串口及其它引脚上的电压 Voltage on UART and other pins (VUART) | VUART | -0.4 | V | Printed max is VIO+0.4; not a numeric limit | 8 | ||
| 电源电压 VDD5 supply voltage | VDD5 | 4 | 5 | 5.25 | V | TA = 25℃, VDD33 = 3.3V, excl. USB pins; VDD5 pin supplied, GND grounded | 8 |
| 电源电压 VDD33 supply voltage | VDD33 | 3 | 3.3 | 3.6 | V | TA = 25℃, VDD33 = 3.3V, excl. USB pins; VDD33 pin supplied, GND grounded | 8 |
| I/O 引脚供电电压 I/O supply voltage (VIO) | VIO | 1.1 | 3.3 | 3.6 | V | TA = 25℃, VDD33 = 3.3V, excl. USB pins | 8 |
| 芯片正常工作时的电源电流 Operating supply current (ICC) | ICC | 20 | 30 | 40 | mA | TA = 25℃, VDD33 = 3.3V, excl. USB pins | 8 |
| USB 挂起时的电源电流 Suspend supply current (ISLP) | ISLP | 200 | 300 | 450 | uA | TA = 25℃, VDD33 = 3.3V, excl. USB pins | 8 |
| 低电平输入电压 Low-level input voltage (VIL) | VIL | 0 | 0.8 | V | VIO = 3.3V | 8 | |
| 低电平输入电压 Low-level input voltage (VIL) | VIL | 0 | 0.6 | V | VIO = 1.8V | 8 | |
| 低电平输入电压 Low-level input voltage (VIL) | VIL | 0 | 0.4 | V | VIO = 1.2V | 8 | |
| 高电平输入电压 High-level input voltage (VIH) | VIH | 2.2 | V | VIO = 3.3V; printed max is VIO (expression, not numeric) | 8 | ||
| 高电平输入电压 High-level input voltage (VIH) | VIH | 1.2 | V | VIO = 1.8V; printed max is VIO (expression, not numeric) | 8 | ||
| 高电平输入电压 High-level input voltage (VIH) | VIH | 0.8 | V | VIO = 1.2V; printed max is VIO (expression, not numeric) | 8 | ||
| 耐受 5V 引脚的高电平输入电压 High-level input voltage, 5V-tolerant pins (VIH5) | VIH5 | 2.2 | 5 | V | VIO = 3.3V | 8 | |
| 耐受 5V 引脚的高电平输入电压 High-level input voltage, 5V-tolerant pins (VIH5) | VIH5 | 1.2 | 5 | V | VIO = 1.8V | 8 | |
| 耐受 5V 引脚的高电平输入电压 High-level input voltage, 5V-tolerant pins (VIH5) | VIH5 | 0.8 | 5 | V | VIO = 1.2V | 8 | |
| 输出低电压 Output low voltage (VOL) | VOL | 0.4 | 0.6 | V | 单个引脚吸入 5mA 电流 (sink 5mA per pin) | 8 | |
| 内置上拉的等效电阻 Built-in pull-up equivalent resistance (RPU) | RPU | 30 | 40 | 55 | KΩ | 8 | |
| VDD33上电/掉电复位的阈值电压 Power-on/power-down reset threshold (VPOR/VPDR) | VPOR/VPDR | 2.55 | 2.7 | 2.85 | V | 8 | |
| ESD静电耐受电压 ESD withstand voltage (VESD) | VESD | 6 | KV | HBM人体模型，非接触式 (HBM, non-contact) | 8 | ||
| 内部时钟的误差 Internal clock error (FD) | FD | -1.2 | 1.7 | % | TA = 0℃～70℃ | 8 | |
| 内部时钟的误差 Internal clock error (FD) | FD | -2.2 | 2.2 | % | TA = -40℃～85℃ | 8 | |
| 电源上电或外部复位输入后的复位延时 Reset delay after power-on or external reset (TRSTD) | TRSTD | 15 | 30 | 45 | mS | TA = 25℃, VDD33 = 3.3V | 8 |
| 检测 USB 自动挂起时间 USB auto-suspend detection time (TSUSP) | TSUSP | 3 | 5 | 9 | mS | TA = 25℃, VDD33 = 3.3V | 8 |
| 芯片睡眠后唤醒完成时间 Wake-up completion time after sleep (TWAKE) | TWAKE | 0.3 | 0.5 | 4 | mS | TA = 25℃, VDD33 = 3.3V | 8 |
| SPI 时钟频率 SPI clock frequency (fSCK) | fSCK/tSCK | 40 | MHz | Load C = 30pF | 7 | ||
| SPI 时钟上升和下降时间 SPI clock rise/fall time (tr(SCK)/tf(SCK)) | tr(SCK)/tf(SCK) | 11 | ns | Load C = 30pF | 7 | ||
| SCS 建立时间 SCS setup time (tSU(SCS)) | tSU(SCS) | 33 | ns | Load C = 30pF | 7 | ||
| SCS 保持时间 SCS hold time (th(SCS)) | th(SCS) | 33 | ns | Load C = 30pF | 7 | ||
| 数据输入建立时间 Data input setup time (tSU(SI)) | tSU(SI) | 4 | ns | Load C = 30pF | 7 | ||
| 数据输入保持时间 Data input hold time (th(SI)) | th(SI) | 2 | ns | Load C = 30pF | 7 | ||
| 数据输出访问时间 Data output access time (ta(SO)) | ta(SO) | 0 | 17 | ns | Load C = 30pF | 7 | |
| 数据输出禁止时间 Data output disable time (tdis(SO)) | tdis(SO) | 0 | 10 | ns | Load C = 30pF | 7 | |
| 数据输出有效时间 Data output valid time (tV(SO)) | tV(SO) | 15 | ns | Load C = 30pF | 7 | ||
| 数据输出保持时间 Data output hold time (th(SO)) | th(SO) | 5 | ns | Load C = 30pF | 7 |
CAD (KiCad official)
- Symbol:
CH9111L - Footprint:
Package_QFP:LQFP-48_7x7mm_P0.5mm - 3D model: LQFP-48(7x7) (KiCad packages3D, STEP)
- 3D model files:
ch9111l-etched.step/ch9111l-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);ch9111l.step/ch9111l.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: WCH(Jiangsu Qin Heng) datasheet (10 pp, sha256
905628f053edd482, retrieved 2026-10-18, 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: parts-factory
2.0.0/extract_pins 0.3, primaryclaude-haiku-5-5(text), consensusclaude-sonnet-5-5(agreed), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish. - CAD: KiCad official libraries (CC-BY-SA 4.0).