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Datasheet

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Contents

Pinout
Key specifications
CAD (KiCad official)
Provenance

README

markdown

STC32G12K128-35I-QFN32

STC Micro · Microcontrollers (MCU/MPU/SOC) · QFN-32(4x4)

STC32G12K128-35I-QFN32 from STC Micro, in a QFN-32(4x4). 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	P1.0	bidirectional	Standard bidirectional GPIO that can also serve as ADC0 analog input, PWM1P capture/output positive, and UART2 RxD; it supports quasi-bidirectional, push-pull, open-drain and high-impedance input modes and is high-impedance after power-up until its mode is set.
2	P1.1	bidirectional	Standard bidirectional GPIO that can also serve as ADC1 analog input, PWM1N complementary output and UART2 TxD; it is high-impedance after power-up until its mode is set.
3	P1.4	bidirectional	Standard bidirectional GPIO that can also serve as ADC4 input, PWM3P output, SPI MISO/USART SPI MISO, or I2C SDA; it is high-impedance after power-up until its mode is set.
4	P1.5	bidirectional	Standard bidirectional GPIO that can also serve as ADC5 input, PWM3N output, SPI SCLK or I2C SCL; it is high-impedance after power-up until its mode is set.
5	P1.6	bidirectional	Standard bidirectional GPIO that can also serve as ADC6 input, UART1 RxD, PWM4P, main clock output MCLKO_2 and the external crystal output XTALO; it is high-impedance after power-up until its mode is set.
6	P1.7	bidirectional	Standard bidirectional GPIO that can also serve as ADC7 input, UART1 TxD, PWM4N, PWM5 and the external crystal/clock input XTALI; it is high-impedance after power-up until its mode is set.
7	P1.3	bidirectional	Standard bidirectional GPIO that can also serve as ADC3 input, SPI MOSI, PWM2N, Timer 2 clock output T2CLKO and I2S data; it is high-impedance after power-up until its mode is set.
8	UCap	passive	USB core power regulator pin, which the datasheet describes as the USB core supply stabilization pin (connect per the application circuit; the text gives no further electrical limit).
9	P5.4	bidirectional	Standard I/O by default; it can be configured as the active-low reset input nRST through ISP (requires a power cycle to take effect), and when used as a reset pin its internal 4K pull-up stays on, while as a plain I/O it stays on for about 6.5 ms after power-up.
10	Vcc/AVcc	power_in	Main supply pin for the MCU and the ADC supply; the part operates from 1.9 V to 5.5 V (below -40 °C the supply must not be under 3.0 V).
11	ADC_VRef+	power_in	External ADC reference voltage input that must be connected to a reference between 2.4 V and MCU-VCC, since leaving it floating causes leakage current.
12	Gnd/AGnd	power_in	Ground pin for digital and analog (ADC) circuits.
13	P3.0	bidirectional	Bidirectional GPIO that is weak-pull-up/quasi-bidirectional after power-up and also serves as USB D- data line, UART1 RxD and external interrupt INT4; during power-up P3.0 and P3.1 both low triggers USB download mode.
14	P3.1	bidirectional	Bidirectional GPIO that is weak-pull-up/quasi-bidirectional after power-up and also serves as USB D+ data line and UART1 TxD; it is used with P3.0 for ISP/emulation.
15	P3.2	bidirectional	Bidirectional GPIO that also serves as external interrupt INT0, SPI SCLK_4, I2C SCL_4 and PWM external trigger inputs PWMETI/PWMETI2; it is driven high during power-up and is the USB download-mode select pin when held low at power-up.
16	P3.3	bidirectional	Bidirectional GPIO that also serves as external interrupt INT1, SPI MISO_4, I2C SDA_4, PWM4N_4 and PWM7_2 output.
17	P3.4	bidirectional	Bidirectional GPIO that also serves as Timer 0 external clock input T0, Timer 1 clock output T1CLKO, SPI MOSI_4, PWM4P_4, PWM8_2 and comparator output CMPO.
18	P3.5	bidirectional	Bidirectional GPIO that also serves as Timer 1 external clock input T1, Timer 0 clock output T0CLKO, SPI SS_4 and the enhanced-PWM external fault input PWMFLT.
19	P3.6	bidirectional	Bidirectional GPIO that also serves as external interrupt INT2, UART1 RxD_2 and comparator negative input CMP-.
20	P3.7	bidirectional	Bidirectional GPIO that also serves as external interrupt INT3, UART2 TxD_2 and comparator positive input CMP+.
21	P2.0	bidirectional	Bidirectional GPIO that also serves as address bus A8 (external bus), PWM1P_2 and PWM5 output.
22	P2.1	bidirectional	Bidirectional GPIO that also serves as address bus A9 (external bus), PWM1N_2 and PWM6 output.
23	P2.2	bidirectional	Bidirectional GPIO that also serves as address bus A10 (external bus), PWM2P_2, PWM7, and SPI SS_2 / USART SPI slave select.
24	P2.3	bidirectional	Bidirectional GPIO that also serves as address bus A11 (external bus), PWM2N_2, PWM8, and SPI MOSI_2 / USART SPI MOSI.
25	P2.4	bidirectional	Bidirectional GPIO that also serves as address bus A12 (external bus), PWM3P_2, I2C SDA_2 and SPI MISO_2 / USART SPI MISO.
26	P2.5	bidirectional	Bidirectional GPIO that also serves as address bus A13 (external bus), PWM3N_2, I2C SCL_2 and SPI SCLK_2 / USART SPI clock.
27	P2.6	bidirectional	Bidirectional GPIO that also serves as address bus A14 (external bus) and PWM4P_2 output.
28	P2.7	bidirectional	Bidirectional GPIO that also serves as address bus A15 (external bus) and PWM4N_2 output.
29	P0.0	bidirectional	Bidirectional GPIO that also serves as address/data bus AD0, ADC8 input, UART3 RxD, PWM5_3, Timer 3 external clock T3_2 and CAN RX.
30	P0.1	bidirectional	Bidirectional GPIO that also serves as address/data bus AD1, ADC9 input, UART3 TxD, PWM6_3, Timer 3 clock output T3CLKO_2 and CAN TX.
31	P0.2	bidirectional	Bidirectional GPIO that also serves as address/data bus AD2, ADC10 input, UART4 RxD, PWM7_3, Timer 4 external clock T4_2, CAN2 RX and LIN RX.
32	P0.3	bidirectional	Bidirectional GPIO that also serves as address/data bus AD3, ADC11 input, UART4 TxD, PWM8_3, Timer 4 clock output T4CLKO_2, CAN2 TX and LIN TX.
33	EP	passive	Exposed pad (from the footprint; not named in the datasheet pin table).

Key specifications

Parameter	Value
Manufacturer	STC Micro
Package	QFN-32(4x4)
Category	Embedded Processors & Controllers
Pins	33

CAD (KiCad official)

Symbol: STC32G12K128-35I-QFN32
Footprint: Package_DFN_QFN:QFN-32-1EP_4x4mm_P0.4mm_EP2.9x2.9mm
3D model: QFN-32(4x4) (KiCad packages3D, STEP)
3D model files: stc32g12k128-35i-qfn32-etched.step / stc32g12k128-35i-qfn32-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); stc32g12k128-35i-qfn32.step / stc32g12k128-35i-qfn32.glb are the bare package body.

Provenance

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

Datasheet: STC Micro datasheet (1887 pp, sha256 59bba1d366cc8d33, retrieved 2026-10-09, 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