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.
main
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{
"schema_version": 1,
"type": "component",
"slug": "ch552t",
"title": "CH552T",
"brief": "WCH Jiangsu Qin Heng USB Converters, TSSOP-20. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",
"version": "0.1.0",
"license": "CC-BY-SA-4.0",
"tags": [
"component",
"interface",
"ch552t",
"factory-2.0.0",
"extractor-text"
],
"component": {
"mpn": "CH552T",
"manufacturer": "WCH Jiangsu Qin Heng",
"package": "TSSOP-20",
"pin_count": 20,
"category": "Interface",
"subcategory": "USB Converters",
"datasheet": "https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8618866389520302080",
"parts": {
"symbol": "ch552t.kicad_sym",
"footprint": "ch552t.kicad_mod",
"model_3d": "ch552t-hero.glb",
"model_3d_plain": "ch552t-etched.glb",
"model_3d_step": "ch552t-etched.step",
"model_3d_step_plain": "ch552t.step",
"lbr": "ch552t.lbr"
},
"distributor_links": {
"lcsc": "C111367"
},
"distributor_check": {
"checked_at": "2026-10-18T00:36:02Z",
"source": "Component Ocean /api/assign-pns",
"digikey": {
"pn": null,
"status": "no match"
},
"mouser": {
"pn": null,
"status": "no match"
}
},
"pins": [
{
"number": "1",
"name": "P3.2/TXD1_/INT0/VBUS1/AIN3",
"type": "bidirectional",
"description": "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."
},
{
"number": "2",
"name": "P1.4/T2_/CAP1_/SCS/TIN2/UCC1/AIN1",
"type": "bidirectional",
"description": "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."
},
{
"number": "3",
"name": "P1.5/MOSI/PWM1/TIN3/UCC2/AIN2",
"type": "bidirectional",
"description": "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."
},
{
"number": "4",
"name": "P1.6/MISO/RXD1/TIN4",
"type": "bidirectional",
"description": "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."
},
{
"number": "5",
"name": "P1.7/SCK/TXD1/TIN5",
"type": "bidirectional",
"description": "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."
},
{
"number": "6",
"name": "RST/T2EX_/CAP2_",
"type": "input",
"description": "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."
},
{
"number": "7",
"name": "P1.0/T2/CAP1/TIN0",
"type": "bidirectional",
"description": "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)."
},
{
"number": "8",
"name": "P1.1/T2EX/CAP2/TIN1/VBUS2/AIN0",
"type": "bidirectional",
"description": "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."
},
{
"number": "9",
"name": "P3.1/PWM2_/TXD",
"type": "bidirectional",
"description": "General-purpose I/O P3.1 with alternate functions PWM2_ output and TXD (UART0 serial data output)."
},
{
"number": "10",
"name": "P3.0/PWM1_/RXD",
"type": "bidirectional",
"description": "General-purpose I/O P3.0 with alternate functions PWM1_ output and RXD (UART0 serial data input)."
},
{
"number": "11",
"name": "P3.3/INT1",
"type": "bidirectional",
"description": "General-purpose I/O P3.3 with alternate function INT1 (external interrupt 1 input)."
},
{
"number": "12",
"name": "P3.4/PWM2/RXD1_/T0",
"type": "bidirectional",
"description": "General-purpose I/O P3.4 with alternate functions PWM2 output, RXD1_ (UART1 receive) and T0 (Timer0 external input)."
},
{
"number": "13",
"name": "P3.5/T1",
"type": "bidirectional",
"description": "General-purpose I/O P3.5 with alternate function T1 (Timer1 external input)."
},
{
"number": "14",
"name": "P3.6/UDP",
"type": "bidirectional",
"description": "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."
},
{
"number": "15",
"name": "P3.7/UDM",
"type": "bidirectional",
"description": "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."
},
{
"number": "16",
"name": "P1.3/XO/TXD_",
"type": "bidirectional",
"description": "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)."
},
{
"number": "17",
"name": "P1.2/XI/RXD_",
"type": "bidirectional",
"description": "General-purpose I/O P1.2 with alternate functions XI (external crystal input, or external clock input) and RXD_ (UART0 alternate receive)."
},
{
"number": "18",
"name": "GND/VSS",
"type": "power_in",
"description": "Common ground (VSS) for the device."
},
{
"number": "19",
"name": "VCC/VDD",
"type": "power_in",
"description": "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."
},
{
"number": "20",
"name": "V33",
"type": "power_out",
"description": "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."
}
],
"provenance": {
"extractor": "extract_pins 0.3",
"factory_chain": {
"factory": "2.0.0",
"extractor": "extract_pins 0.3",
"primary_model": "claude-haiku-5-5",
"primary_mode": "text",
"consensus_model": "claude-sonnet-5-5",
"consensus": "agreed",
"guards": "pin_guards 0.1: passed",
"guard_notes": [
"extractor flagged: V33 is documented both as an internal regulator output and as an input that must be tied to VCC when; P3.6/P3.7 are powered from V33 and are not 5V tolerant (high level limited to V33); this limit is re; These pins carry analog (ADC/comparator) functions; the datasheet requires the pin be high-impedance"
],
"pages_sent": 48,
"cost_usd": 0.2891,
"at": "2026-10-18T00:34:12"
},
"datasheet": {
"url": "https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8618866389520302080",
"pages": 53,
"sha256": "b3995c47a6c00a9f",
"source_tier": "lcsc"
},
"cad": "KiCad official (CC-BY-SA 4.0)",
"pins": {
"total": 20,
"described": 20,
"cites_pages": true,
"refuses_to_fabricate": true
}
},
"viewers": {
"symbol": "viewers/symbol.html",
"footprint": "viewers/footprint.html"
},
"models_3d": [
{
"file": "ch552t.step",
"role": "plain",
"up": "Z",
"units": "mm",
"origin": "footprint origin = pad-pattern centre",
"seat": "z = 0",
"extents_mm": [
6.4,
6.5,
1.2
],
"zmin_mm": 0,
"centre_offset_mm": 0,
"footprint_binding": "identity",
"sha256": "97339947f3a7196470ec2f1d9f9b92bb2fc2ab66ad53be0cf105192585ef3c9a",
"checked": "2026-10-18",
"checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
},
{
"file": "ch552t-etched.step",
"role": "eda",
"up": "Z",
"units": "mm",
"origin": "footprint origin = pad-pattern centre",
"seat": "z = 0",
"extents_mm": [
6.4,
6.5,
1.2
],
"zmin_mm": 0,
"centre_offset_mm": 0,
"footprint_binding": "identity",
"sha256": "7fad5c8c1deba44bb6591234d5d4e172725250ba23e6b9be763a10fe38212c21",
"checked": "2026-10-18",
"checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
}
]
},
"metadata": {
"specs": {
"Manufacturer": "WCH Jiangsu Qin Heng",
"Package": "TSSOP-20",
"Category": "Interface",
"Pins": "20"
},
"characteristics": {
"version": 1,
"source": "datasheet",
"datasheet_sha256": "b3995c47a6c00a9f9fd4de5c7fb7d6ee890a1b1cd86bf9f207ee12389f3e46fb",
"rows": [
{
"name": "工作时的环境温度",
"symbol": "TA",
"kind": "absolute_maximum",
"unit": "℃",
"min": -40,
"typ": null,
"max": 85,
"conditions": "",
"source_page": 49,
"source": "datasheet"
},
{
"name": "储存时的环境温度",
"symbol": "TS",
"kind": "absolute_maximum",
"unit": "℃",
"min": -55,
"typ": null,
"max": 125,
"conditions": "",
"source_page": 49,
"source": "datasheet"
},
{
"name": "电源电压(VCC 接电源，GND 接地)",
"symbol": "VCC",
"kind": "absolute_maximum",
"unit": "V",
"min": -0.4,
"typ": null,
"max": 5.8,
"conditions": "",
"source_page": 49,
"source": "datasheet"
},
{
"name": "除 P3.6/P3.7 之外其它输入或者输出引脚上的电压",
"symbol": "VIO",
"kind": "absolute_maximum",
"unit": "V",
"min": -0.4,
"typ": null,
"max": null,
"conditions": "",
"source_page": 49,
"source": "datasheet"
},
{
"name": "P3.6/P3.7 输入或者输出引脚上的电压",
"symbol": "VIOU",
"kind": "absolute_maximum",
"unit": "V",
"min": -0.4,
"typ": null,
"max": null,
"conditions": "",
"source_page": 49,
"source": "datasheet"
},
{
"name": "VCC 引脚电源电压 V33 仅外接电容",
"symbol": "VCC5",
"kind": "electrical",
"unit": "V",
"min": 3.7,
"typ": 5,
"max": 5.5,
"conditions": "TA=25℃，VCC=5V，Fsys=6MHz",
"source_page": 49,
"source": "datasheet"
},
{
"name": "内部 USB 电源调整器输出电压",
"symbol": "V33",
"kind": "electrical",
"unit": "V",
"min": 3.14,
"typ": 3.27,
"max": 3.4,
"conditions": "TA=25℃，VCC=5V，Fsys=6MHz",
"source_page": 49,
"source": "datasheet"
},
{
"name": "Fsys=24MHz 工作时的总电源电流",
"symbol": "ICC24M5",
"kind": "electrical",
"unit": "mA",
"min": null,
"typ": 8,
"max": 11,
"conditions": "TA=25℃，VCC=5V，Fsys=6MHz",
"source_page": 49,
"source": "datasheet"
},
{
"name": "Fsys=6MHz 工作时的总电源电流",
"symbol": "ICC6M5",
"kind": "electrical",
"unit": "mA",
"min": null,
"typ": 4,
"max": 6,
"conditions": "TA=25℃，VCC=5V，Fsys=6MHz",
"source_page": 49,
"source": "datasheet"
},
{
"name": "Fsys=750KHz 工作时的总电源电流",
"symbol": "ICC750K5",
"kind": "electrical",
"unit": "mA",
"min": null,
"typ": 2,
"max": 3,
"conditions": "TA=25℃，VCC=5V，Fsys=6MHz",
"source_page": 49,
"source": "datasheet"
},
{
"name": "睡眠后的总电源电流",
"symbol": "ISLP5",
"kind": "electrical",
"unit": "mA",
"min": null,
"typ": 0.1,
"max": 0.2,
"conditions": "TA=25℃，VCC=5V，Fsys=6MHz",
"source_page": 49,
"source": "datasheet"
},
{
"name": "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",
"symbol": "ISLP5L",
"kind": "electrical",
"unit": "mA",
"min": null,
"typ": 0.008,
"max": 0.025,
"conditions": "TA=25℃，VCC=5V，Fsys=6MHz",
"source_page": 49,
"source": "datasheet"
},
{
"name": "ADC 模数转换模块工作电流",
"symbol": "IADC5",
"kind": "electrical",
"unit": "uA",
"min": null,
"typ": 200,
"max": 800,
"conditions": "TA=25℃，VCC=5V，Fsys=6MHz",
"source_page": 49,
"source": "datasheet"
},
{
"name": "电压比较器模块工作电流",
"symbol": "ICMP5",
"kind": "electrical",
"unit": "uA",
"min": null,
"typ": 100,
"max": 500,
"conditions": "TA=25℃，VCC=5V，Fsys=6MHz",
"source_page": 49,
"source": "datasheet"
},
{
"name": "触摸按键电容检测模块工作电流",
"symbol": "ITKEY5",
"kind": "electrical",
"unit": "uA",
"min": null,
"typ": 150,
"max": 250,
"conditions": "TA=25℃，VCC=5V，Fsys=6MHz",
"source_page": 49,
"source": "datasheet"
},
{
"name": "低电平输入电压",
"symbol": "VIL5",
"kind": "electrical",
"unit": "V",
"min": -0.4,
"typ": null,
"max": 1.2,
"conditions": "TA=25℃，VCC=5V，Fsys=6MHz",
"source_page": 49,
"source": "datasheet"
},
{
"name": "高电平输入电压",
"symbol": "VIH5",
"kind": "electrical",
"unit": "V",
"min": 2.4,
"typ": null,
"max": null,
"conditions": "TA=25℃，VCC=5V，Fsys=6MHz",
"source_page": 49,
"source": "datasheet"
},
{
"name": "低电平输出电压(12mA 吸入电流)",
"symbol": "VOL5",
"kind": "electrical",
"unit": "V",
"min": null,
"typ": null,
"max": 0.4,
"conditions": "TA=25℃，VCC=5V，Fsys=6MHz",
"source_page": 49,
"source": "datasheet"
},
{
"name": "无上拉输入端的输入电流",
"symbol": "IIN",
"kind": "electrical",
"unit": "uA",
"min": -5,
"typ": 0,
"max": 5,
"conditions": "TA=25℃，VCC=5V，Fsys=6MHz",
"source_page": 49,
"source": "datasheet"
},
{
"name": "带下拉电阻输入端的输入电流",
"symbol": "IDN5",
"kind": "electrical",
"unit": "uA",
"min": -35,
"typ": -70,
"max": -140,
"conditions": "TA=25℃，VCC=5V，Fsys=6MHz",
"source_page": 49,
"source": "datasheet"
},
{
"name": "带上拉电阻输入端的输入电流",
"symbol": "IUP5",
"kind": "electrical",
"unit": "uA",
"min": 35,
"typ": 70,
"max": 140,
"conditions": "TA=25℃，VCC=5V，Fsys=6MHz",
"source_page": 49,
"source": "datasheet"
},
{
"name": "带上拉输入端由低向高翻转时的输入电流",
"symbol": "IUP5X",
"kind": "electrical",
"unit": "uA",
"min": 250,
"typ": 400,
"max": 600,
"conditions": "TA=25℃，VCC=5V，Fsys=6MHz",
"source_page": 49,
"source": "datasheet"
},
{
"name": "电源上电复位的门限电压",
"symbol": "Vpot",
"kind": "electrical",
"unit": "V",
"min": 2.1,
"typ": 2.3,
"max": 2.5,
"conditions": "TA=25℃，VCC=5V，Fsys=6MHz",
"source_page": 49,
"source": "datasheet"
},
{
"name": "VCC 引脚电源电压 V33 短接到 VCC，开启 USB",
"symbol": "VCC3",
"kind": "electrical",
"unit": "V",
"min": 3,
"typ": 3.3,
"max": 3.6,
"conditions": "TA=25℃，VCC=V33=3.3V，Fsys=6MHz",
"source_page": 49,
"source": "datasheet"
},
{
"name": "VCC 引脚电源电压 V33 短接到 VCC，关闭 USB",
"symbol": "VCC3",
"kind": "electrical",
"unit": "V",
"min": 2.8,
"typ": 3.3,
"max": 3.6,
"conditions": "TA=25℃，VCC=V33=3.3V，Fsys=6MHz",
"source_page": 49,
"source": "datasheet"
},
{
"name": "Fsys=12MHz 工作时的总电源电流",
"symbol": "ICC12M3",
"kind": "electrical",
"unit": "mA",
"min": null,
"typ": 3,
"max": 5,
"conditions": "TA=25℃，VCC=V33=3.3V，Fsys=6MHz",
"source_page": 49,
"source": "datasheet"
},
{
"name": "Fsys=6MHz 工作时的总电源电流",
"symbol": "ICC6M3",
"kind": "electrical",
"unit": "mA",
"min": null,
"typ": 2,
"max": 4,
"conditions": "TA=25℃，VCC=V33=3.3V，Fsys=6MHz",
"source_page": 49,
"source": "datasheet"
},
{
"name": "Fsys=750KHz 工作时的总电源电流",
"symbol": "ICC750K3",
"kind": "electrical",
"unit": "mA",
"min": null,
"typ": 1,
"max": 2,
"conditions": "TA=25℃，VCC=V33=3.3V，Fsys=6MHz",
"source_page": 49,
"source": "datasheet"
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