component
CH552T
Public Made by Adomby adom
WCH Jiangsu Qin Heng USB Converters, TSSOP-20. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
3D Model
Open in new tab ↗
Loads when you scroll to it. Unloads after 5 minutes in the background.
Symbol & Footprint
Schematic Symbol
Open full view ↗Loads when you scroll to it. Unloads after 5 minutes in the background.
PCB Footprint
Open full view ↗Loads when you scroll to it. Unloads after 5 minutes in the background.
Datasheet
Open in new tab ↗Loads when you scroll to it. Unloads after 5 minutes in the background.
README
markdownCH552T
WCH Jiangsu Qin Heng · USB Converters · TSSOP-20
CH552T from WCH Jiangsu Qin Heng, in a TSSOP-20. 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 | P3.2/TXD1_/INT0/VBUS1/AIN3 | bidirectional | General-purpose I/O P3.2 with alternate functions TXD1_, INT0, VBUS1 (USB type-C bus voltage detect input) and AIN3 (ADC input channel 3); other GPIO pins default to internal pull-up resistors. |
| 2 | P1.4/T2_/CAP1_/SCS/TIN2/UCC1/AIN1 | bidirectional | General-purpose I/O P1.4 with alternate functions T2_, CAP1_, SCS (SPI0 chip select, active low), TIN2 (touch-key input), UCC1 (USB type-C configuration channel) and AIN1 (ADC input); a selected analog input pin must be set to high-impedance input or open-drain output high with pull-ups disabled. |
| 3 | P1.5/MOSI/PWM1/TIN3/UCC2/AIN2 | bidirectional | General-purpose I/O P1.5 with alternate functions MOSI (SPI0), PWM1 output, TIN3 (touch-key input), UCC2 (USB type-C configuration channel) and AIN2 (ADC input); as an analog input it must be set to high-impedance input or open-drain output high with pull-ups disabled. |
| 4 | P1.6/MISO/RXD1/TIN4 | bidirectional | General-purpose I/O P1.6 with alternate functions MISO (SPI0), RXD1 (UART1 receive) and TIN4 (touch-key input); it is the default MISO pin for in-circuit programming. |
| 5 | P1.7/SCK/TXD1/TIN5 | bidirectional | General-purpose I/O P1.7 with alternate functions SCK (SPI0 clock), TXD1 (UART1 transmit) and TIN5 (touch-key input); it is the required SCK pin for in-circuit programming. |
| 6 | RST/T2EX_/CAP2_ | input | External reset input, active high, with an internal pull-down resistor; a reset requires a high level longer than Trst (70 ns minimum) and is only enabled when the En_RST_RESET configuration bit is set. |
| 7 | P1.0/T2/CAP1/TIN0 | bidirectional | General-purpose I/O P1.0 with alternate functions T2 (Timer2 external count input/clock output), CAP1 (Timer2 capture input 1) and TIN0 (touch-key input). |
| 8 | P1.1/T2EX/CAP2/TIN1/VBUS2/AIN0 | bidirectional | General-purpose I/O P1.1 with alternate functions T2EX (Timer2 reload/capture input), CAP2 (Timer2 capture input 2), TIN1 (touch-key input), VBUS2 (USB type-C bus voltage detect input) and AIN0 (ADC input); as an analog input it must be set to high-impedance input or open-drain output high. |
| 9 | P3.1/PWM2_/TXD | bidirectional | General-purpose I/O P3.1 with alternate functions PWM2_ output and TXD (UART0 serial data output). |
| 10 | P3.0/PWM1_/RXD | bidirectional | General-purpose I/O P3.0 with alternate functions PWM1_ output and RXD (UART0 serial data input). |
| 11 | P3.3/INT1 | bidirectional | General-purpose I/O P3.3 with alternate function INT1 (external interrupt 1 input). |
| 12 | P3.4/PWM2/RXD1_/T0 | bidirectional | General-purpose I/O P3.4 with alternate functions PWM2 output, RXD1_ (UART1 receive) and T0 (Timer0 external input). |
| 13 | P3.5/T1 | bidirectional | General-purpose I/O P3.5 with alternate function T1 (Timer1 external input). |
| 14 | P3.6/UDP | bidirectional | General-purpose I/O P3.6 with alternate function UDP (USB D+); it uses V33 as I/O supply so high output can only reach V33 and it is not 5V tolerant, and no series resistor may be placed on it when used for USB. |
| 15 | P3.7/UDM | bidirectional | General-purpose I/O P3.7 with alternate function UDM (USB D-); it uses V33 as I/O supply so high output can only reach V33 and it is not 5V tolerant, and no series resistor may be placed on it when used for USB. |
| 16 | P1.3/XO/TXD_ | bidirectional | General-purpose I/O P1.3 with alternate functions XO (external crystal inverting output, used when the external oscillator is enabled) and TXD_ (UART0 alternate transmit). |
| 17 | P1.2/XI/RXD_ | bidirectional | General-purpose I/O P1.2 with alternate functions XI (external crystal input, or external clock input) and RXD_ (UART0 alternate receive). |
| 18 | GND/VSS | power_in | Common ground (VSS) for the device. |
| 19 | VCC/VDD | power_in | Power supply input for the device, which requires an external 0.1uF decoupling capacitor; the VCC pin is specified for an external voltage of 3V to 5V, and the absolute maximum rating is -0.4 V to 5.8 V. |
| 20 | V33 | power_out | Output of the internal USB power regulator (3.3V) and input for the internal USB power; connect to VCC when the supply is below 3.6V, or decouple with at least 0.1uF to GND when the supply is above 3.6V. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | WCH Jiangsu Qin Heng |
| Package | TSSOP-20 |
| Category | Interface |
| Pins | 20 |
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 | TA | -40 | 85 | ℃ | 49 | ||
| 储存时的环境温度 | TS | -55 | 125 | ℃ | 49 | ||
| 电源电压(VCC 接电源，GND 接地) | VCC | -0.4 | 5.8 | V | 49 | ||
| 除 P3.6/P3.7 之外其它输入或者输出引脚上的电压 | VIO | -0.4 | V | 49 | |||
| P3.6/P3.7 输入或者输出引脚上的电压 | VIOU | -0.4 | V | 49 | |||
| VCC 引脚电源电压 V33 仅外接电容 | VCC5 | 3.7 | 5 | 5.5 | V | TA=25℃，VCC=5V，Fsys=6MHz | 49 |
| 内部 USB 电源调整器输出电压 | V33 | 3.14 | 3.27 | 3.4 | V | TA=25℃，VCC=5V，Fsys=6MHz | 49 |
| Fsys=24MHz 工作时的总电源电流 | ICC24M5 | 8 | 11 | mA | TA=25℃，VCC=5V，Fsys=6MHz | 49 | |
| Fsys=6MHz 工作时的总电源电流 | ICC6M5 | 4 | 6 | mA | TA=25℃，VCC=5V，Fsys=6MHz | 49 | |
| Fsys=750KHz 工作时的总电源电流 | ICC750K5 | 2 | 3 | mA | TA=25℃，VCC=5V，Fsys=6MHz | 49 | |
| 睡眠后的总电源电流 | ISLP5 | 0.1 | 0.2 | mA | TA=25℃，VCC=5V，Fsys=6MHz | 49 | |
| VCC=V33=5V，且选用外部晶体时钟，且 bLDO3V3_OFF=1 关闭 LDO，完全睡眠后的总电源电流 | ISLP5L | 0.008 | 0.025 | mA | TA=25℃，VCC=5V，Fsys=6MHz | 49 | |
| ADC 模数转换模块工作电流 | IADC5 | 200 | 800 | uA | TA=25℃，VCC=5V，Fsys=6MHz | 49 | |
| 电压比较器模块工作电流 | ICMP5 | 100 | 500 | uA | TA=25℃，VCC=5V，Fsys=6MHz | 49 | |
| 触摸按键电容检测模块工作电流 | ITKEY5 | 150 | 250 | uA | TA=25℃，VCC=5V，Fsys=6MHz | 49 | |
| 低电平输入电压 | VIL5 | -0.4 | 1.2 | V | TA=25℃，VCC=5V，Fsys=6MHz | 49 | |
| 高电平输入电压 | VIH5 | 2.4 | V | TA=25℃，VCC=5V，Fsys=6MHz | 49 | ||
| 低电平输出电压(12mA 吸入电流) | VOL5 | 0.4 | V | TA=25℃，VCC=5V，Fsys=6MHz | 49 | ||
| 无上拉输入端的输入电流 | IIN | -5 | 0 | 5 | uA | TA=25℃，VCC=5V，Fsys=6MHz | 49 |
| 带下拉电阻输入端的输入电流 | IDN5 | -35 | -70 | -140 | uA | TA=25℃，VCC=5V，Fsys=6MHz | 49 |
| 带上拉电阻输入端的输入电流 | IUP5 | 35 | 70 | 140 | uA | TA=25℃，VCC=5V，Fsys=6MHz | 49 |
| 带上拉输入端由低向高翻转时的输入电流 | IUP5X | 250 | 400 | 600 | uA | TA=25℃，VCC=5V，Fsys=6MHz | 49 |
| 电源上电复位的门限电压 | Vpot | 2.1 | 2.3 | 2.5 | V | TA=25℃，VCC=5V，Fsys=6MHz | 49 |
| VCC 引脚电源电压 V33 短接到 VCC，开启 USB | VCC3 | 3 | 3.3 | 3.6 | V | TA=25℃，VCC=V33=3.3V，Fsys=6MHz | 49 |
| VCC 引脚电源电压 V33 短接到 VCC，关闭 USB | VCC3 | 2.8 | 3.3 | 3.6 | V | TA=25℃，VCC=V33=3.3V，Fsys=6MHz | 49 |
| Fsys=12MHz 工作时的总电源电流 | ICC12M3 | 3 | 5 | mA | TA=25℃，VCC=V33=3.3V，Fsys=6MHz | 49 | |
| Fsys=6MHz 工作时的总电源电流 | ICC6M3 | 2 | 4 | mA | TA=25℃，VCC=V33=3.3V，Fsys=6MHz | 49 | |
| Fsys=750KHz 工作时的总电源电流 | ICC750K3 | 1 | 2 | mA | TA=25℃，VCC=V33=3.3V，Fsys=6MHz | 49 | |
| 睡眠后的总电源电流 | ISLP3 | 0.07 | 0.15 | mA | TA=25℃，VCC=V33=3.3V，Fsys=6MHz | 49 | |
| bLDO3V3_OFF=1 关闭 LDO，完全睡眠后的总电源电流 | ISLP3L | 0.004 | 0.015 | mA | TA=25℃，VCC=V33=3.3V，Fsys=6MHz | 50 | |
| ADC 模数转换模块工作电流 | IADC3 | 150 | 500 | uA | TA=25℃，VCC=V33=3.3V，Fsys=6MHz | 50 | |
| 电压比较器模块工作电流 | ICMP3 | 70 | 300 | uA | TA=25℃，VCC=V33=3.3V，Fsys=6MHz | 50 | |
| 触摸按键电容检测模块工作电流 | ITKEY3 | 130 | 200 | uA | TA=25℃，VCC=V33=3.3V，Fsys=6MHz | 50 | |
| 低电平输入电压 | VIL3 | -0.4 | 0.8 | V | TA=25℃，VCC=V33=3.3V，Fsys=6MHz | 50 | |
| 高电平输入电压 | VIH3 | 1.9 | V | TA=25℃，VCC=V33=3.3V，Fsys=6MHz | 50 | ||
| 低电平输出电压(8mA 吸入电流) | VOL3 | 0.4 | V | TA=25℃，VCC=V33=3.3V，Fsys=6MHz | 50 | ||
| 无上拉输入端的输入电流 | IIN | -5 | 0 | 5 | uA | TA=25℃，VCC=V33=3.3V，Fsys=6MHz | 50 |
| 带下拉电阻输入端的输入电流 | IDN3 | -15 | -30 | -60 | uA | TA=25℃，VCC=V33=3.3V，Fsys=6MHz | 50 |
| 带上拉电阻输入端的输入电流 | IUP3 | 15 | 30 | 60 | uA | TA=25℃，VCC=V33=3.3V，Fsys=6MHz | 50 |
| 带上拉输入端由低向高翻转时的输入电流 | IUP3X | 100 | 170 | 250 | uA | TA=25℃，VCC=V33=3.3V，Fsys=6MHz | 50 |
| 电源上电复位的门限电压 | Vpot | 2.1 | 2.3 | 2.5 | V | TA=25℃，VCC=V33=3.3V，Fsys=6MHz | 50 |
| 外部晶体频率或者 XI 输入时钟频率 | Fxt | 6 | 24 | 25 | MHz | TA=25℃，VCC=5V 或 VCC=V33=3.3V，Fsys=6MHz | 50 |
| 经校准后的内部时钟频率 | Fosc | 23.52 | 24 | 24.48 | MHz | V33=3V～3.6V | 50 |
| 经校准后的内部时钟频率 | Fosc28 | 23 | 24 | 24.72 | MHz | V33=2.8V～3V | 50 |
| 经校准后的内部时钟频率 | Fosc27 | 21 | 24 | 25 | MHz | V33<2.8V | 50 |
| 内部倍频后的 PLL 频率 | Fpll | 24 | 96 | 100 | MHz | TA=25℃，VCC=5V 或 VCC=V33=3.3V，Fsys=6MHz | 50 |
| 使用 USB 设备功能时，USB 采样时钟频率 | Fusb4x | 47.04 | 48 | 48.96 | MHz | TA=25℃，VCC=5V 或 VCC=V33=3.3V，Fsys=6MHz | 50 |
| 系统主频时钟频率（VCC>=4.5V） | Fsys | 0.1 | 6 | 24 | MHz | VCC>=4.5V | 50 |
| 系统主频时钟频率（4.5V>VCC>=3.8V） | Fsys | 0.1 | 6 | 16 | MHz | 4.5V>VCC>=3.8V | 50 |
| 系统主频时钟频率（VCC<3.8V） | Fsys | 0.1 | 6 | 12 | MHz | VCC<3.8V | 50 |
| 电源上电复位延时 | Tpor | 9 | 11 | 15 | mS | TA=25℃，VCC=5V 或 VCC=V33=3.3V，Fsys=6MHz | 50 |
| 从 RST 外部输入有效复位信号的宽度 | Trst | 70 | nS | TA=25℃，VCC=5V 或 VCC=V33=3.3V，Fsys=6MHz | 50 | ||
| 热复位延时 | Trdl | 30 | 45 | 60 | uS | TA=25℃，VCC=5V 或 VCC=V33=3.3V，Fsys=6MHz | 50 |
| 检测 USB 自动挂起时间 | Tusp | 4 | 5 | 6 | mS | TA=25℃，VCC=5V 或 VCC=V33=3.3V，Fsys=6MHz | 50 |
| 芯片睡眠后唤醒完成时间 | Twak | 1 | 2 | 10 | uS | TA=25℃，VCC=5V 或 VCC=V33=3.3V，Fsys=6MHz | 50 |
CAD (KiCad official)
- Symbol:
CH552T - Footprint:
Package_SO:TSSOP-20_4.4x6.5mm_P0.65mm - 3D model: TSSOP-20 (KiCad packages3D, STEP)
- 3D model files:
ch552t-etched.step/ch552t-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);ch552t.step/ch552t.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: WCH Jiangsu Qin Heng datasheet (53 pp, sha256
b3995c47a6c00a9f, 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).