# STC32G12K64-35I-LQFP48

**STC Micro** · Microcontrollers (MCU/MPU/SOC) · LQFP-48(7x7)

STC32G12K64-35I-LQFP48 from STC Micro, in a LQFP-48(7x7). 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 | P5.3 | bidirectional | Standard I/O port P5.3 (quasi-bidirectional, push-pull, open-drain or high-impedance input modes, optional 4K pull-up); alternates TxD4_2 (UART4 TX), CAN2_TX_2 and LIN_TX_2. |
| 2 | P0.5 | bidirectional | Standard I/O port P0.5 with alternates AD5 (address/data bus), ADC13 (ADC input channel 13) and T3CLKO (Timer 3 clock divided output). |
| 3 | P0.6 | bidirectional | Standard I/O port P0.6 with alternates AD6, ADC14 (ADC input channel 14), T4 (Timer 4 external clock input) and PWM external fault/trigger input PWMETI2_2 (listed as PWMFLT2_2 in the pin table). |
| 4 | P0.7 | bidirectional | Standard I/O port P0.7 with alternates AD7 (address/data bus) and T4CLKO (Timer 4 clock divided output). |
| 5 | P1.0 | bidirectional | Standard I/O port P1.0 with alternates ADC0 (ADC input channel 0), PWM1P (PWM1 capture input / pulse output positive) and RxD2 (UART2 receive). |
| 6 | P1.1 | bidirectional | Standard I/O port P1.1 with alternates ADC1 (ADC input channel 1), PWM1N (PWM1 pulse output negative) and TxD2 (UART2 transmit). |
| 7 | P4.7 | bidirectional | Standard I/O port P4.7 with alternates TxD2_2 (UART2 transmit), CAN2_TX_3 and LIN_TX_3. |
| 8 | P1.4 | bidirectional | Standard I/O port P1.4 with alternates ADC4 (ADC input channel 4), PWM3P, MISO/S1MISO/S2MISO (SPI master-in slave-out) and SDA (I2C data). |
| 9 | P1.5 | bidirectional | Standard I/O port P1.5 with alternates ADC5 (ADC input channel 5), PWM3N, SCLK/S1SCLK/S2SCLK (SPI clock) and SCL (I2C clock). |
| 10 | P1.6 | bidirectional | Standard I/O port P1.6 with alternates ADC6, RxD_3 (UART1 receive), PWM4P, MCLKO_2 (master clock divided output) and XTALO (external crystal output). |
| 11 | P1.7 | bidirectional | Standard I/O port P1.7 with alternates ADC7, TxD_3 (UART1 transmit), PWM4N, PWM5_2 and XTALI (external crystal / external clock input). |
| 12 | P1.3 | bidirectional | Standard I/O port P1.3 with alternates ADC3, MOSI/S1MOSI/S2MOSI (SPI master-out slave-in), PWM2N and T2CLKO (Timer 2 clock divided output). |
| 13 | UCAP | passive | USB core power regulator stabilization pin; connect the decoupling capacitor shown in the datasheet reference circuits. |
| 14 | P5.4/nRST | bidirectional | Standard I/O port P5.4 after factory default; can be set through ISP as the active-low reset input nRST (reset level low), and also alternates MCLKO, SS, ADC2 and T2. |
| 15 | Vcc/AVcc | power_in | Main supply input, 1.9 V to 5.5 V (operation below -40 °C requires at least 3.0 V); AVcc is the ADC supply. |
| 16 | ADC_VRef+ | input | ADC external reference voltage input; must be connected to an external reference between 2.4 V and MCU-VCC, since floating causes leakage current. |
| 17 | Gnd/AGnd | power_in | Ground; AGnd is the ADC analog ground. |
| 18 | P4.0 | bidirectional | Standard I/O port P4.0 with alternates MOSI_3, S1MOSI_3 and S2MOSI_3 (SPI master-out slave-in). |
| 19 | P3.0 | bidirectional | Standard I/O port P3.0 with USB D- data line, RxD (UART1 receive) and INT4; quasi-bidirectional with weak pull-up at power-up and used for USB/serial ISP download and emulation. |
| 20 | P3.1 | bidirectional | Standard I/O port P3.1 with USB D+ data line and TxD (UART1 transmit); quasi-bidirectional with weak pull-up at power-up and used with P3.0 for ISP download and emulation. |
| 21 | P3.2 | bidirectional | Standard I/O port P3.2 with INT0, SCLK_4, SCL_4 and PWM external trigger inputs PWMETI/PWMETI2; held high at power-on reset and pulled low to select USB download mode. |
| 22 | P3.3 | bidirectional | Standard I/O port P3.3 with INT1, MISO_4, SDA_4, PWM4N_4 and PWM7_2. |
| 23 | P3.4 | bidirectional | Standard I/O port P3.4 with T0 external clock input, T1CLKO, MOSI_4, PWM4P_4, PWM8_2 and CMPO (comparator output). |
| 24 | P5.0 | bidirectional | Standard I/O port P5.0 with RxD3_2 (UART3 receive), CMP+_2 (comparator positive input) and CAN_RX_2. |
| 25 | P5.1 | bidirectional | Standard I/O port P5.1 with TxD3_2 (UART3 transmit), CMP+_3 (comparator positive input) and CAN_TX_2. |
| 26 | P3.5 | bidirectional | Standard I/O port P3.5 with T1 external clock input, T0CLKO, SS_4 (SPI slave select) and PWMFLT (PWM external fault input). |
| 27 | P3.6 | bidirectional | Standard I/O port P3.6 with INT2, RxD_2 (UART1 receive alternate) and CMP- (comparator negative input). |
| 28 | P3.7 | bidirectional | Standard I/O port P3.7 with INT3, TxD_2 (UART1 transmit alternate) and CMP+ (comparator positive input). |
| 29 | P4.1 | bidirectional | Standard I/O port P4.1 with MISO_3, S1MISO_3, S2MISO_3, CMPO_2 and PWMETI_2. |
| 30 | P4.2 | bidirectional | Standard I/O port P4.2 with WR (external bus write strobe) and CAN_RX_3. |
| 31 | P4.3 | bidirectional | Standard I/O port P4.3 with RxD_4 (UART4 receive), SCLK_3, S1SCLK_3 and S2SCLK_3. |
| 32 | P4.4 | bidirectional | Standard I/O port P4.4 with RD (external bus read strobe) and TxD_4 (UART4 transmit). |
| 33 | P2.0 | bidirectional | Standard I/O port P2.0 with A8 (address bus), PWM1P_2 and PWM5. |
| 34 | P2.1 | bidirectional | Standard I/O port P2.1 with A9 (address bus), PWM1N_2 and PWM6. |
| 35 | P2.2 | bidirectional | Standard I/O port P2.2 with A10 (address bus), PWM2P_2, PWM7, SS_2, S1SS_2 and S2SS_2. |
| 36 | P2.3 | bidirectional | Standard I/O port P2.3 with A11 (address bus), PWM2N_2, PWM8, MOSI_2, S1MOSI_2 and S2MOSI_2. |
| 37 | P2.4 | bidirectional | Standard I/O port P2.4 with A12 (address bus), PWM3P_2, SDA_2, MISO_2, S1MISO_2 and S2MISO_2. |
| 38 | P2.5 | bidirectional | Standard I/O port P2.5 with A13 (address bus), PWM3N_2, SCL_2, SCLK_2, S1SCLK_2 and S2SCLK_2. |
| 39 | P2.6 | bidirectional | Standard I/O port P2.6 with A14 (address bus) and PWM4P_2. |
| 40 | P2.7 | bidirectional | Standard I/O port P2.7 with A15 (address bus) and PWM4N_2. |
| 41 | P4.5 | bidirectional | Standard I/O port P4.5 with ALE (address latch enable) and CAN_TX_3. |
| 42 | P4.6 | bidirectional | Standard I/O port P4.6 with LIN_RX_3, CAN2_RX_3 and RxD2_2 (UART2 receive alternate). |
| 43 | P0.0 | bidirectional | Standard I/O port P0.0 with AD0 (address/data bus), ADC8, RxD3 (UART3 receive), PWM5_3, T3_2 and CAN_RX. |
| 44 | P0.1 | bidirectional | Standard I/O port P0.1 with AD1 (address/data bus), ADC9, TxD3 (UART3 transmit), PWM6_3, T3CLKO_2 and CAN_TX. |
| 45 | P0.2 | bidirectional | Standard I/O port P0.2 with AD2 (address/data bus), ADC10, RxD4 (UART4 receive), PWM7_3, T4_2, CAN2_RX and LIN_RX. |
| 46 | P0.3 | bidirectional | Standard I/O port P0.3 with AD3 (address/data bus), ADC11, TxD4 (UART4 transmit), PWM8_3, T4CLKO_2, CAN2_TX and LIN_TX. |
| 47 | P0.4 | bidirectional | Standard I/O port P0.4 with AD4 (address/data bus), ADC12 and T3 (Timer 3 external clock input). |
| 48 | P5.2 | bidirectional | Standard I/O port P5.2 with RxD4_2 (UART4 receive), CAN2_RX_2 and LIN_RX_2. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | STC Micro |
| Package | LQFP-48(7x7) |
| Category | Embedded Processors & Controllers |
| Pins | 48 |

## 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 | ℃ |  | 1656 |
| 工作温度（内部高速 IRC 和外部晶振） |  | -40 |  | 85 | ℃ | 使用内部高速 IRC 和外部晶振 | 1656 |
| 工作温度（高温） |  | -40 |  | 125 | ℃ | 高于 85℃时请使用外部耐高温晶振，且工作频率建议控制在 24M 以下 | 1656 |
| 工作电压 |  | 1.9 |  | 5.5 | V | 工作温度低于-40℃时，工作电压不得低于 3.0V | 1656 |
| VDD 对地电压 | VDD | -0.3 |  | 5.5 | V |  | 1656 |
| I/O 口对地电压 |  | -0.3 |  |  | V | 最大值原文为 VDD+0.3 V | 1656 |
| 内部 IRC 温漂（-20℃~65℃） |  | -0.88 |  | 1.05 | % | -20℃~65℃，参考温度 25℃ | 1656 |
| 内部 IRC 温漂（-40℃~85℃） |  | -1.38 |  | 1.42 | % | -40℃~85℃，参考温度 25℃ | 1656 |
| 内部 IRC 温漂（-40℃~125℃） |  | -3 |  | 3 | % | -40℃~125℃，参考温度 25℃ | 1656 |
| 普通工作模式电流 | ICC |  | 4 | 20 | mA |  | 1657 |
| 输入低电平（打开施密特触发） | VIL1 |  |  | 1.32 | V | 打开施密特触发 | 1657 |
| 输入低电平（关闭施密特触发） | VIL1 |  |  | 1.48 | V | 关闭施密特触发 | 1657 |
| 输入高电平（普通 I/O，打开施密特触发） | VIH1 | 1.6 |  |  | V | 打开施密特触发 | 1657 |
| 输入高电平（普通 I/O，关闭施密特触发） | VIH1 | 1.54 |  |  | V | 关闭施密特触发 | 1657 |
| 逻辑 0 输入电流 | IIL |  |  | 50 | uA | 端口电压 0V | 1657 |
| 逻辑 1 到 0 的转移电流 | ITL | 100 | 270 | 600 | uA | 端口电压 2.0V | 1657 |
| I/O 口上拉电阻 | RPU | 4.1 | 4.2 | 4.4 | KΩ |  | 1657 |
| 低压复位门槛电压 POR | POR |  | 1.9 |  | V | 测试温度 25℃ | 1656 |
| 低压复位门槛电压 LVR0 | LVR0 |  | 2 |  | V | 测试温度 25℃ | 1656 |
| 低压复位门槛电压 LVR1 | LVR1 |  | 2.4 |  | V | 测试温度 25℃ | 1656 |
| 低压复位门槛电压 LVR2 | LVR2 |  | 2.7 |  | V | 测试温度 25℃ | 1656 |
| 低压复位门槛电压 LVR3 | LVR3 |  | 3 |  | V | 测试温度 25℃ | 1656 |

## CAD (KiCad official)

- Symbol: `STC32G12K64-35I-LQFP48`
- Footprint: `Package_QFP:LQFP-48_7x7mm_P0.5mm`
- 3D model: LQFP-48(7x7) (KiCad packages3D, STEP)
- 3D model files: `stc32g12k64-35i-lqfp48-etched.step` / `stc32g12k64-35i-lqfp48-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `stc32g12k64-35i-lqfp48.step` / `stc32g12k64-35i-lqfp48.glb` are the bare package body.

## Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

- **Datasheet:** [STC Micro datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8756362851173326848) (1887 pp, sha256 `59bba1d366cc8d33`, retrieved 2026-10-20, 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](docs/stc32g12k64-35i-lqfp48-datasheet.pdf)