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STC8051U-34K64-QFP44
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STC Micro Microcontrollers (MCU/MPU/SOC), LQFP-44(10x10). 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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README
markdownSTC8051U-34K64-QFP44
STC Micro · Microcontrollers (MCU/MPU/SOC) · LQFP-44(10x10)
STC8051U-34K64-QFP44 from STC Micro, in a LQFP-44(10x10). 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 | P1.5 | bidirectional | General-purpose I/O P1.5 with quasi-bidirectional, push-pull, high-impedance or open-drain mode selectable, also usable as ADC5, MOSI, SCL_2 or PWM7_2. |
| 2 | P1.6 | bidirectional | General-purpose I/O P1.6 with selectable port mode, also usable as ADC6, MISO, RxD_3 or QSPIIO1. |
| 3 | P1.7 | bidirectional | General-purpose I/O P1.7 with selectable port mode, also usable as ADC7, SCLK, TxD_3 or QSPICLK. |
| 4 | P4.7 | bidirectional | General-purpose I/O P4.7, which can be configured as the RST reset input (active low) through RSTCFG P47RST; it carries a 10K pull-up that is enabled for about 6.5 ms after power-up when used as I/O. |
| 5 | P3.0 | bidirectional | General-purpose I/O P3.0 that also serves as the USB D- line, RxD and INT4; it is weak-pull-up/quasi-bidirectional after power-up. |
| 6 | P4.3 | bidirectional | General-purpose I/O P4.3 with selectable port mode, also usable as CCP1_2, SCLK_3 or TxD2_2. |
| 7 | P3.1 | bidirectional | General-purpose I/O P3.1 that also serves as the USB D+ line and TxD; it is weak-pull-up/quasi-bidirectional after power-up. |
| 8 | P3.2 | bidirectional | General-purpose I/O P3.2 that also serves as INT0 and SCL_4; during power-up it is pulled up to read USB-ISP entry state when P3.0 and P3.1 are both low. |
| 9 | P3.3 | bidirectional | General-purpose I/O P3.3 that also serves as INT1, SDA_4 or MISO_4. |
| 10 | P3.4 | bidirectional | General-purpose I/O P3.4 that also serves as T0 (timer 0 external input), T1CLKO or MOSI_4. |
| 11 | P3.5 | bidirectional | General-purpose I/O P3.5 that also serves as T1 (timer 1 external input), T0CLKO, PWMFLT or SS_4. |
| 12 | P3.6 | bidirectional | General-purpose I/O P3.6 that also serves as INT2, WR_2 or RxD_2. |
| 13 | P3.7 | bidirectional | General-purpose I/O P3.7 that also serves as INT3, RD_2 or TxD_2. |
| 14 | P5.6 | bidirectional | General-purpose I/O P5.6 that also serves as XTALO (crystal output) or the MCLKO clock output; it is a high-impedance input in external clock mode. |
| 15 | P5.7 | bidirectional | General-purpose I/O P5.7 that also serves as XTALI (crystal/external clock input). |
| 16 | Gnd | power_in | Ground, shared with ADC_AGnd and ADC_Vref-; the datasheet recommends a short, thick trace between system ground and ADC analog ground. |
| 17 | P4.0 | bidirectional | General-purpose I/O P4.0 with selectable port mode, also usable as SS_3, ADCETR_2 or QSPINCS_2. |
| 18 | P2.0 | bidirectional | General-purpose I/O P2.0 that also serves as address bit A8, T11, CCP0_3 or PWM1P_3. |
| 19 | P2.1 | bidirectional | General-purpose I/O P2.1 that also serves as address bit A9, T11CLKO, CCP1_3 or PWM1N_3. |
| 20 | P2.2 | bidirectional | General-purpose I/O P2.2 that also serves as address bit A10, CCP2_3 or PWM2P_3. |
| 21 | P2.3 | bidirectional | General-purpose I/O P2.3 that also serves as address bit A11, SDA, ECI_3 or PWM2N_3. |
| 22 | P2.4 | bidirectional | General-purpose I/O P2.4 that also serves as address bit A12, SS_2, SCL or PWM3P_3. |
| 23 | P2.5 | bidirectional | General-purpose I/O P2.5 that also serves as address bit A13, MOSI_2, PWM3N_3 or QSPIIO0_3. |
| 24 | P2.6 | bidirectional | General-purpose I/O P2.6 that also serves as address bit A14, MISO_2, PWM4P_3 or QSPIIO1_3. |
| 25 | P2.7 | bidirectional | General-purpose I/O P2.7 that also serves as address bit A15, SCLK_2, PWM4N_3 or QSPICLK_3. |
| 26 | UCAP | passive | Internal regulator filter capacitor pin (shown as UCAP, also multiplexed with P4.4/RD/TxD_4/CCP2_2/PWMAPS5_2); it must be connected to an external capacitor as shown in the datasheet reference circuits. |
| 27 | P4.5 | bidirectional | General-purpose I/O P4.5 that also serves as ALE, CMPO or QSPIIO3_3. |
| 28 | P4.1 | bidirectional | General-purpose I/O P4.1 that also serves as CMPO_2, ECI_2, MOSI_3 or QSPIIO0_2. |
| 29 | P4.6 | bidirectional | General-purpose I/O P4.6 that also serves as the CMP+ comparator input or QSPIIO2_3. |
| 30 | P0.7 | bidirectional | General-purpose I/O P0.7 that also serves as AD7, T4CLKO, CMP+_2, PWM8 or PWMFLT_3. |
| 31 | P0.6 | bidirectional | General-purpose I/O P0.6 that also serves as ADC14, AD6, T4, CMP+_3 or PWM4P_2. |
| 32 | P0.5 | bidirectional | General-purpose I/O P0.5 that also serves as ADC13, AD5, T3CLKO, CMP- or PWM3N_2. |
| 33 | P0.4 | bidirectional | General-purpose I/O P0.4 that also serves as ADC12, AD4, T3 or PWM3P_2. |
| 34 | P0.3 | bidirectional | General-purpose I/O P0.3 that also serves as ADC11, AD3, TxD4, PWM2N_2 or PWM6. |
| 35 | P0.2 | bidirectional | General-purpose I/O P0.2 that also serves as ADC10, AD2, RxD4 or PWM2P_2. |
| 36 | P0.1 | bidirectional | General-purpose I/O P0.1 that also serves as ADC9, AD1, TxD3, PWM1N_2 or PWM5. |
| 37 | P0.0 | bidirectional | General-purpose I/O P0.0 that also serves as ADC8, AD0, RxD3 or PWM1P_2. |
| 38 | Vcc | power_in | Supply pin shared with AVcc and ADC_VRef+; the datasheet specifies a 1.9V to 5.5V operating range. |
| 39 | P4.2 | bidirectional | General-purpose I/O P4.2 that also serves as WR, RxD2_2, CCP0_2, MISO_3 or QSPIIO1_2. |
| 40 | P1.0 | bidirectional | General-purpose I/O P1.0 that also serves as ADC0, T2, PWM1P or ADC input for the comparator. |
| 41 | P1.1 | bidirectional | General-purpose I/O P1.1 that also serves as ADC1, CCP2, T2CLKO or PWM1N. |
| 42 | P1.2 | bidirectional | General-purpose I/O P1.2 that also serves as ADC2, RxD2, ECI, PWM2P or QSPIIO3. |
| 43 | P1.3 | bidirectional | General-purpose I/O P1.3 that also serves as ADC3, TxD2, CCP0, PWM2N or QSPIIO2. |
| 44 | P1.4 | bidirectional | General-purpose I/O P1.4 that also serves as ADC4, SS, SDA_2, CCP1, PWM3P or QSPINCS. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | STC Micro |
| Package | LQFP-44(10x10) |
| Category | Embedded Processors & Controllers |
| Pins | 44 |
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 | 155 | ℃ | 1185 | |||
| 工作温度 | -40 | 85 | ℃ | 使用内部高速 IRC 和外部晶振 | 1185 | ||
| 工作温度 | -40 | 125 | ℃ | 温度高于85℃时请使用外部晶振，且工作频率建议控制在24M以下 | 1185 | ||
| 工作电压 | 1.9 | 5.5 | V | 1185 | |||
| 工作电压 | 3 | V | 工作温度低于-40℃时 | 1185 | |||
| VDD对地电压 | VDD | -0.3 | 5.5 | V | 1185 | ||
| I/O口对地电压 | -0.3 | V | 1185 | ||||
| 普通工作模式电流 | ICC | 4 | 20 | mA | VSS=0V, VDD=5.0V, 测试温度=25℃ | 1185 | |
| 输入低电平 | VIL1 | 1.32 | V | 打开施密特触发 | 1185 | ||
| 输入低电平 | VIL1 | 1.48 | V | 关闭施密特触发 | 1185 | ||
| 输入高电平（普通 I/O） | VIH1 | 1.6 | V | 打开施密特触发 | 1185 | ||
| 输入高电平（普通 I/O） | VIH1 | 1.54 | V | 关闭施密特触发 | 1185 | ||
| 逻辑 0 输入电流 | IIL | 50 | uA | 端口电压 0V | 1185 | ||
| 逻辑 1 到 0 的转移电流 | ITL | 100 | 270 | 600 | uA | 端口电压 2.0V | 1185 |
| I/O 口上拉电阻 | RPU | 4.1 | 4.2 | 4.4 | KΩ | 1185 |
CAD (KiCad official)
- Symbol:
STC8051U-34K64-QFP44 - Footprint:
Package_QFP:LQFP-44_10x10mm_P0.8mm - 3D model: LQFP-44(10x10) (KiCad packages3D, STEP)
- 3D model files:
stc8051u-34k64-qfp44-etched.step/stc8051u-34k64-qfp44-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);stc8051u-34k64-qfp44.step/stc8051u-34k64-qfp44.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: STC Micro datasheet (1195 pp, sha256
a6715a28b4455f2b, retrieved 2026-10-27, 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).