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CH552T

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WCH Jiangsu Qin Heng USB Converters, TSSOP-20. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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CH552T

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.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); ch552t.step / ch552t.glb are 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, primary claude-haiku-5-5 (text), consensus claude-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).

Datasheet PDF