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AI8H2K12U-45I-TSSOP20
Public Made by Adomby adom
STC Micro Microcontrollers (MCU/MPU/SOC), TSSOP-20. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
3D Model
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Symbol & Footprint
Schematic Symbol
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PCB Footprint
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Datasheet
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Contents
README
markdownAI8H2K12U-45I-TSSOP20
STC Micro · Microcontrollers (MCU/MPU/SOC) · TSSOP-20
AI8H2K12U-45I-TSSOP20 from STC Micro, 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 | P1.4 | bidirectional | General-purpose I/O port P1.4; supports quasi-bidirectional, push-pull, open-drain and high-impedance input modes. |
| 2 | P1.5 | bidirectional | General-purpose I/O port P1.5; supports quasi-bidirectional, push-pull, open-drain and high-impedance input modes. |
| 3 | P1.6 | bidirectional | General-purpose I/O port P1.6; an external crystal can be fitted on P1.6/P1.7. |
| 4 | P1.7 | bidirectional | General-purpose I/O port P1.7; an external crystal can be fitted on P1.6/P1.7. |
| 5 | P1.3 | bidirectional | General-purpose I/O port P1.3. |
| 6 | UCap | passive | UCap pin, connected to an external capacitor (0.1u shown in the reference schematic). |
| 7 | P5.4 | bidirectional | P5.4 I/O, default I/O function, configurable as active-low reset nRST; drives MCU_VCC power control in the auto power-cycle ISP circuit. |
| 8 | Vcc | power_in | Positive power supply pin. |
| 9 | Vref+ | power_in | Reference supply pin (VRef+), wired to Vcc in the reference schematic. |
| 10 | Gnd | power_in | Ground pin. |
| 11 | D-/P3.0 | bidirectional | USB D- data line, shared with P3.0 (RxD); used for ISP download and debug interface. |
| 12 | D+/P3.1 | bidirectional | USB D+ data line, shared with P3.1 (TxD); used for ISP download and debug interface. |
| 13 | P3.2 | bidirectional | General-purpose I/O port P3.2; pulled low at power-up together with P3.0/P3.1 selects USB ISP download mode. |
| 14 | P3.3 | bidirectional | General-purpose I/O port P3.3. |
| 15 | P3.4 | bidirectional | General-purpose I/O port P3.4; shown as push-pull output in the dual-UART schematic. |
| 16 | P3.5 | bidirectional | General-purpose I/O port P3.5; outputs low at power-up to keep MCU_VCC powered in the auto power-cycle ISP circuit. |
| 17 | RxD/P3.6 | bidirectional | P3.6 I/O, UART1 receive (RxD), second serial port for communication. |
| 18 | TxD/P3.7 | bidirectional | P3.7 I/O, UART1 transmit (TxD), second serial port for communication. |
| 19 | TxD2/P1.1 | bidirectional | P1.1 I/O, UART2 transmit (TxD2). |
| 20 | RxD2/P1.0 | bidirectional | P1.0 I/O, UART2 receive (RxD2). |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | STC Micro |
| Package | TSSOP-20 |
| Category | Embedded Processors & Controllers |
| 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 |
|---|---|---|---|---|---|---|---|
| 存储温度 | -55 | 150 | ℃ | 1826 | |||
| 工作温度 | -40 | 125 | ℃ | 1826 | |||
| 工作电压 | 1.9 | 5.5 | V | 1826 | |||
| VDD 对地电压 | VDD | -0.3 | 5.5 | V | 1826 | ||
| I/O 口对地电压 | -0.3 | V | 1826 | ||||
| 输入低电平（打开施密特触发） | VIL1 | 0.99 | V | VSS=0V, VDD=3.3V, 测试温度=25℃; 打开施密特触发 | 1827 | ||
| 输入低电平（关闭施密特触发） | VIL1 | 1.07 | V | VSS=0V, VDD=3.3V, 测试温度=25℃; 关闭施密特触发 | 1827 | ||
| 输入高电平（普通 I/O，打开施密特触发） | VIH1 | 1.18 | V | VSS=0V, VDD=3.3V, 测试温度=25℃; 打开施密特触发 | 1827 | ||
| 输入高电平（普通 I/O，关闭施密特触发） | VIH1 | 1.09 | V | VSS=0V, VDD=3.3V, 测试温度=25℃; 关闭施密特触发 | 1827 | ||
| 逻辑 0 输入电流 | IIL | 50 | uA | VSS=0V, VDD=3.3V, 测试温度=25℃; 端口电压 0V | 1827 | ||
| 逻辑 1 到 0 的转移电流 | ITL | 100 | 270 | 600 | uA | VSS=0V, VDD=3.3V, 测试温度=25℃; 端口电压 2.0V | 1827 |
| I/O 口上拉电阻 | RPU | 5.8 | 5.9 | 6 | KΩ | VSS=0V, VDD=3.3V, 测试温度=25℃ | 1827 |
Materials and finish
As the datasheet states them (page.json metadata.appearance; the 3D model's colours follow it).
| Part | Material | Colour / plating | Datasheet says | Page |
|---|---|---|---|---|
| housing | PC | Accumulator contents and the contents of a sixteen-bit base register, which may be either the Data Pointer or the PC. In the latter case, the PC is incremented to the address of the following | 1021 |
CAD (KiCad official)
- Symbol:
AI8H2K12U-45I-TSSOP20 - Footprint:
Package_SO:TSSOP-20_4.4x6.5mm_P0.65mm - 3D model: TSSOP-20 (KiCad packages3D, STEP)
- 3D model files:
ai8h2k12u-45i-tssop20-etched.step/ai8h2k12u-45i-tssop20-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);ai8h2k12u-45i-tssop20.step/ai8h2k12u-45i-tssop20.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: STC Micro datasheet (2160 pp, sha256
3d1a528ec8100d28, retrieved 2026-11-07, 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-sonnet-5-5(text+vision), consensusclaude-opus-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).