# STC8C2K32S2-36I-LQFP44

**STC Micro** · Microcontroller Units (MCUs/MPUs/SOCs) · LQFP-44

STC8C2K32S2-36I-LQFP44 from STC Micro, in a LQFP-44. 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 I/O port P1.0, also RxD2 (UART2 receive). Port is high-impedance input after power-up except P3.0/P3.1. |
| 2 | P1.1 | bidirectional | Standard I/O port P1.1, also TxD2 (UART2 transmit output). |
| 3 | P1.2 | bidirectional | Standard I/O port P1.2, also SS (SPI slave select), T2 external clock input. |
| 4 | P1.3 | bidirectional | Standard I/O port P1.3, also MOSI (SPI master out) and T2CLKO (Timer 2 clock output). |
| 5 | P1.4 | bidirectional | Standard I/O port P1.4, also MISO (SPI master in) and I2C SDA data line. |
| 6 | P4.4 | bidirectional | Standard I/O port P4.4, also external bus RD read strobe and TxD_4 (UART1 transmit alternate). |
| 7 | P1.5 | bidirectional | Standard I/O port P1.5, also SPI clock SCLK and I2C clock SCL. |
| 8 | P1.6 | bidirectional | Standard I/O port P1.6, also RxD_3 (UART1 receive alternate), XTALO external crystal output and MCLKO_2 main clock output. |
| 9 | P1.7 | bidirectional | Standard I/O port P1.7, also TxD_3 (UART1 transmit alternate) and XTALI external crystal/clock input. |
| 10 | P4.5 | bidirectional | Standard I/O port P4.5, also ALE on external bus. |
| 11 | P4.6 | bidirectional | Standard I/O port P4.6. |
| 12 | P4.7 | bidirectional | Standard I/O port P4.7. |
| 13 | P5.4 | bidirectional | Standard I/O port P5.4, also RST reset input (active low when configured as reset pin) and MCLKO main clock output. |
| 14 | Vcc | power_in | Power supply pin, operating voltage 1.9V to 5.5V. |
| 15 | P5.5 | bidirectional | Standard I/O port P5.5. |
| 16 | Gnd | power_in | Ground pin. |
| 17 | P4.0 | bidirectional | Standard I/O port P4.0, also WR_3 external bus write strobe and RxD2_2 (UART2 receive alternate). |
| 18 | P3.0 | bidirectional | Standard I/O port P3.0, also RxD (UART1 receive) and external interrupt INT4; weak-pull-up/quasi-bidirectional after power-up. |
| 19 | P3.1 | bidirectional | Standard I/O port P3.1, also TxD (UART1 transmit); weak-pull-up/quasi-bidirectional after power-up. |
| 20 | P3.2 | bidirectional | Standard I/O port P3.2, also external interrupt INT0, SPI SCLK_4 and I2C SCL_4; must not be held low together with P3.0 and P3.1 at power-up if USB ISP is not used. |
| 21 | P3.3 | bidirectional | Standard I/O port P3.3, also external interrupt INT1, SPI MISO_4 and I2C SDA_4. |
| 22 | P3.4 | bidirectional | Standard I/O port P3.4, also Timer 0 external clock input T0, T1CLKO output, SPI MOSI_4 and comparator output CMPO. |
| 23 | P3.5 | bidirectional | Standard I/O port P3.5, also Timer 1 external clock input T1, T0CLKO output and SPI SS_4. |
| 24 | P3.6 | bidirectional | Standard I/O port P3.6, also external interrupt INT2, external bus WR_2, RxD_2 and comparator negative input CMP-. |
| 25 | P3.7 | bidirectional | Standard I/O port P3.7, also external interrupt INT3, external bus RD_2, TxD_2 and comparator positive input CMP+. |
| 26 | P4.1 | bidirectional | Standard I/O port P4.1, also ALE on external bus and comparator output CMPO_2. |
| 27 | P2.0 | bidirectional | Standard I/O port P2.0, also external bus address line A8. |
| 28 | P2.1 | bidirectional | Standard I/O port P2.1, also external bus address line A9. |
| 29 | P2.2 | bidirectional | Standard I/O port P2.2, also external bus address line A10 and SPI SS_2. |
| 30 | P2.3 | bidirectional | Standard I/O port P2.3, also external bus address line A11 and SPI MOSI_2. |
| 31 | P2.4 | bidirectional | Standard I/O port P2.4, also external bus address line A12, SPI MISO_2 and I2C SDA_2. |
| 32 | P2.5 | bidirectional | Standard I/O port P2.5, also external bus address line A13, SPI SCLK_2 and I2C SCL_2. |
| 33 | P2.6 | bidirectional | Standard I/O port P2.6, also external bus address line A14. |
| 34 | P2.7 | bidirectional | Standard I/O port P2.7, also external bus address line A15. |
| 35 | P0.0 | bidirectional | Standard I/O port P0.0, also external bus address/data AD0 and UART3 receive RxD3. |
| 36 | P0.1 | bidirectional | Standard I/O port P0.1, also external bus address/data AD1 and UART3 transmit TxD3. |
| 37 | P0.2 | bidirectional | Standard I/O port P0.2, also external bus address/data AD2 and UART4 receive RxD4. |
| 38 | P0.3 | bidirectional | Standard I/O port P0.3, also external bus address/data AD3 and UART4 transmit TxD4. |
| 39 | P0.4 | bidirectional | Standard I/O port P0.4, also external bus address/data AD4 and Timer 3 external clock input T3. |
| 40 | P0.5 | bidirectional | Standard I/O port P0.5, also external bus address/data AD5 and Timer 3 clock output T3CLKO. |
| 41 | P0.6 | bidirectional | Standard I/O port P0.6, also external bus address/data AD6 and Timer 4 external clock input T4. |
| 42 | P0.7 | bidirectional | Standard I/O port P0.7, also external bus address/data AD7 and Timer 4 clock output T4CLKO. |
| 43 | P1.0 | bidirectional | Standard I/O port P1.0, also RxD2 (UART2 receive). |
| 44 | P1.1 | bidirectional | Standard I/O port P1.1, also TxD2 (UART2 transmit output). |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | STC Micro |
| Package | LQFP-44 |
| Category | Single Chip Microcomputer/Microcontroller |
| 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 |
|---|---|---|---|---|---|---|---|
| Storage temperature |  | -55 |  | 150 | ℃ |  | 786 |
| Operating temperature |  | -40 |  | 85 | ℃ |  | 786 |
| Operating voltage |  | 1.9 |  | 5.5 | V |  | 786 |
| VDD to ground voltage | VDD | -0.3 |  | 5.5 | V |  | 786 |
| I/O to ground voltage |  | -0.3 |  |  | V | max printed as VDD+0.3 V | 786 |
| Input low voltage, Schmitt trigger open | VIL1 |  |  | 0.99 | V | VDD=3.3V, 25℃; 打开施密特触发 | 787 |
| Input low voltage, Schmitt trigger closed | VIL1 |  |  | 1.07 | V | VDD=3.3V, 25℃; 关闭施密特触发 | 787 |
| Input high voltage (normal I/O), Schmitt trigger open | VIH1 | 1.18 |  |  | V | VDD=3.3V, 25℃; 打开施密特触发 | 787 |
| Input high voltage (normal I/O), Schmitt trigger closed | VIH1 | 1.09 |  |  | V | VDD=3.3V, 25℃; 关闭施密特触发 | 787 |
| Logic 0 input current | IIL |  |  | 50 | uA | VDD=3.3V, 25℃; 端口电压 0V | 787 |
| Logic 1 to 0 transition current | ITL | 100 | 270 | 600 | uA | VDD=3.3V, 25℃; 端口电压 2.0V | 787 |
| I/O pull-up resistance | RPU | 5.8 | 5.9 | 6 | KΩ | VDD=3.3V, 25℃ | 787 |
| Comparator maximum speed |  |  |  | 10 | MHz | 关闭所有模拟和数字滤波 | 787 |
| Output low sink current | IOL1 |  | 20 |  | mA | VDD=3.3V, 25℃; 端口电压 0.45V | 787 |
| Output high source current, push-pull | IOH2 |  | 20 |  | mA | VDD=3.3V, 25℃; 端口电压 2.4V | 787 |
| Output high current, bidirectional mode | IOH1 |  | 110 |  | uA | VDD=3.3V, 25℃; 双向模式 | 787 |
| Power-down mode current | IPD |  | 0.4 |  | uA | VDD=3.3V, 25℃ | 787 |
| Power-down wake-up timer current | IWKT |  | 1.4 |  | uA | VDD=3.3V, 25℃ | 787 |
| Low-voltage detection module current | ILVD |  | 10 |  | uA | VDD=3.3V, 25℃ | 787 |
| Comparator current | ICMP |  | 90 |  | uA | VDD=3.3V, 25℃ | 787 |
| Idle mode current (internal 32KHz) | IIDL |  | 0.48 |  | mA | VDD=3.3V, 25℃ | 787 |
| Idle mode current (6MHz) | IIDL |  | 0.88 |  | mA | VDD=3.3V, 25℃ | 787 |
| Idle mode current (12MHz) | IIDL |  | 1 |  | mA | VDD=3.3V, 25℃ | 787 |
| Idle mode current (24MHz) | IIDL |  | 1.16 |  | mA | VDD=3.3V, 25℃ | 787 |
| Normal mode current (internal 32KHz) | INOR |  | 0.48 |  | mA | VDD=3.3V, 25℃ | 787 |
| Normal mode current (500KHz) | INOR |  | 0.88 |  | mA | VDD=3.3V, 25℃ | 787 |
| Normal mode current (1MHz) | INOR |  | 0.94 |  | mA | VDD=3.3V, 25℃ | 787 |
| Normal mode current (2MHz) | INOR |  | 1.05 |  | mA | VDD=3.3V, 25℃ | 787 |
| Normal mode current (3MHz) | INOR |  | 1.17 |  | mA | VDD=3.3V, 25℃ | 787 |
| Normal mode current (4MHz) | INOR |  | 1.26 |  | mA | VDD=3.3V, 25℃ | 787 |
| Normal mode current (5MHz) | INOR |  | 1.4 |  | mA | VDD=3.3V, 25℃ | 787 |
| Normal mode current (6MHz) | INOR |  | 1.49 |  | mA | VDD=3.3V, 25℃ | 787 |
| Normal mode current (12MHz) | INOR |  | 2.09 |  | mA | VDD=3.3V, 25℃ | 787 |
| Normal mode current (24MHz) | INOR |  | 3.16 |  | mA | VDD=3.3V, 25℃ | 787 |

## 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 | 419 |

## CAD (KiCad official)

- Symbol: `STC8C2K32S2-36I-LQFP44`
- Footprint: `Package_QFP:LQFP-44_10x10mm_P0.8mm`
- 3D model: LQFP-44 (KiCad packages3D, STEP)
- 3D model files: `stc8c2k32s2-36i-lqfp44-etched.step` / `stc8c2k32s2-36i-lqfp44-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `stc8c2k32s2-36i-lqfp44.step` / `stc8c2k32s2-36i-lqfp44.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [STC Micro datasheet](docs/stc8c2k32s2-36i-lqfp44-datasheet.pdf) (956 pp, sha256 `f8fa5bab02998432`, 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`, primary `claude-haiku-5-5` (text), consensus `off` (skipped (clean text read)), 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/stc8c2k32s2-36i-lqfp44-datasheet.pdf)