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STC12C5616AD-35I-SOP28
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STC Micro Microcontrollers (MCU/MPU/SOC), SOIC-28-300mil. 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
markdownSTC12C5616AD-35I-SOP28
STC Micro · Microcontrollers (MCU/MPU/SOC) · SOIC-28-300mil
STC12C5616AD-35I-SOP28 from STC Micro, in a SOIC-28-300mil. 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 | P2.2 | bidirectional | Standard quasi-bidirectional I/O port 2 bit 2 (PORT2[2]), configurable per pin as quasi-bidirectional, push-pull, input-only (high-impedance) or open-drain. |
| 2 | P2.3 | bidirectional | Standard I/O port 2 bit 3 (PORT2[3]), configurable as quasi-bidirectional, push-pull, input-only or open-drain; each I/O sources or sinks up to 20 mA, with the whole chip not to exceed 55 mA per the port-mode section. |
| 3 | RST | input | Reset input; holding RST high for at least 24 clock cycles plus 10 µs puts the MCU into reset, and it starts from 0000H when RST is pulled low again. |
| 4 | P3.0/RxD | bidirectional | Standard I/O port 3 bit 0 that doubles as the UART serial data receive input RxD. |
| 5 | P3.1/TxD | bidirectional | Standard I/O port 3 bit 1 that doubles as the UART serial data transmit output TxD. |
| 6 | XTAL2 | output | Output of the internal clock inverting amplifier for the external crystal; when an external clock drives XTAL1 this pin may be left floating. |
| 7 | XTAL1 | input | Input to the internal clock inverting amplifier for the external crystal, and the external clock input when an external clock source is used directly. |
| 8 | P3.2/INT0 | bidirectional | Standard I/O port 3 bit 2 that doubles as external interrupt 0, triggered by falling edge or low level. |
| 9 | P3.3/INT1 | bidirectional | Standard I/O port 3 bit 3 that doubles as external interrupt 1, triggered by falling edge or low level. |
| 10 | P3.4/T0/ECI | bidirectional | Standard I/O port 3 bit 4 that doubles as external input of Timer/Counter 0 (T0) and the external pulse input of the PCA counter (ECI). |
| 11 | P3.5/T1/PCA1/PWM1 | bidirectional | Standard I/O port 3 bit 5 that doubles as external input of Timer/Counter 1 (T1), PCA module 1 output and PWM1 output. |
| 12 | P2.4/PCA3/PWM3 | bidirectional | Standard I/O port 2 bit 4 that doubles as PCA module 3 output and PWM3 output. |
| 13 | P2.5 | bidirectional | Standard I/O port 2 bit 5 (PORT2[5]), configurable as quasi-bidirectional, push-pull, input-only or open-drain. |
| 14 | Gnd | power_in | Power supply ground (negative supply terminal). |
| 15 | P2.6 | bidirectional | Standard I/O port 2 bit 6 (PORT2[6]), configurable as quasi-bidirectional, push-pull, input-only or open-drain. |
| 16 | P2.7 | bidirectional | Standard I/O port 2 bit 7 (PORT2[7]), configurable as quasi-bidirectional, push-pull, input-only or open-drain. |
| 17 | P3.7/PCA0/PWM0 | bidirectional | Standard I/O port 3 bit 7 that doubles as PCA module 0 output and PWM0 output. |
| 18 | P1.0/ADC0/CLKOUT0 | bidirectional | Standard I/O port 1 bit 0 that doubles as ADC input channel 0 and Timer 0 clock output CLKOUT0 when T0CLKO is enabled; when used as ADC it must be set to open-drain or input-only mode. |
| 19 | P1.1/ADC1/CLKOUT1 | bidirectional | Standard I/O port 1 bit 1 that doubles as ADC input channel 1 and Timer 1 clock output CLKOUT1 when T1CLKO is enabled; when used as ADC it must be set to open-drain or input-only mode. |
| 20 | P1.2/ADC2 | bidirectional | Standard I/O port 1 bit 2 that doubles as ADC input channel 2; when used as ADC it must be set to open-drain or input-only mode. |
| 21 | P1.3/ADC3 | bidirectional | Standard I/O port 1 bit 3 that doubles as ADC input channel 3; when used as ADC it must be set to open-drain or input-only mode. |
| 22 | P1.4/ADC4/SS | bidirectional | Standard I/O port 1 bit 4 that doubles as ADC input channel 4 and SPI slave select SS; when used as ADC it must be set to open-drain or input-only mode. |
| 23 | P1.5/ADC5/MOSI | bidirectional | Standard I/O port 1 bit 5 that doubles as ADC input channel 5 and SPI master-out/slave-in MOSI; when used as ADC it must be set to open-drain or input-only mode. |
| 24 | P1.6/ADC6/MISO | bidirectional | Standard I/O port 1 bit 6 that doubles as ADC input channel 6 and SPI master-in/slave-out MISO; when used as ADC it must be set to open-drain or input-only mode. |
| 25 | P1.7/ADC7/SCLK | bidirectional | Standard I/O port 1 bit 7 that doubles as ADC input channel 7 and SPI serial clock SCLK; when used as ADC it must be set to open-drain or input-only mode. |
| 26 | P2.0/PCA2/PWM2 | bidirectional | Standard I/O port 2 bit 0 that doubles as PCA module 2 output and PWM2 output. |
| 27 | P2.1 | bidirectional | Standard I/O port 2 bit 1 (PORT2[1]), configurable as quasi-bidirectional, push-pull, input-only or open-drain. |
| 28 | VCC | power_in | Positive power supply; the datasheet gives the operating range as 5.5 V to 3.5 V for this 5 V variant. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | STC Micro |
| Package | SOIC-28-300mil |
| Category | Embedded Processors & Controllers |
| Pins | 28 |
Electrical characteristics
Limits as printed in the datasheet (page.json metadata.characteristics carries them as data).
| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| Operating Voltage (VDD) | VDD | 3.5 | 5 | 5.5 | V | 530 | |
| Operating Current | ICC | 4 | 20 | mA | 5V | 530 | |
| Input Low Voltage (P0,P1,P2,P3) | VIL1 | 0.8 | V | 5V | 530 | ||
| Input Low Voltage (RESET, XTAL1) | VIL2 | 1.5 | V | 5V | 530 | ||
| Input High Voltage (P0,P1,P2,P3) | VIH1 | 2 | V | 5V | 530 | ||
| Input High Voltage (RESET) | VIH2 | 3 | V | 5V | 530 | ||
| Sourcing Current for output high (P0,P1,P2,P3) (Quasi-output) | IOH1 | 150 | 230 | uA | 5V | 530 | |
| Logic 0 input current (P0,P1,P2,P3) | IIL | 18 | 50 | uA | Vpin=0V | 530 | |
| Logic 1 to 0 transition current (P0,P1,P2,P3) | ITL | 270 | 600 | uA | Vpin=2.0V | 530 | |
| Storage temperature | TST | -55 | 125 | ℃ | 530 | ||
| Operating temperature (I) | TA | -40 | 85 | ℃ | 530 | ||
| DC power supply (5V) | VDD - VSS | -0.3 | 6 | V | 530 | ||
| Voltage on any pin | -0.5 | 5.5 | V | 530 |
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 | 172 |
CAD (KiCad official)
- Symbol:
STC12C5616AD-35I-SOP28 - Footprint:
Package_SO:SOIC-28W_7.5x17.9mm_P1.27mm - 3D model: SOIC-28-300mil (KiCad packages3D, STEP)
- 3D model files:
stc12c5616ad-35i-sop28-etched.step/stc12c5616ad-35i-sop28-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);stc12c5616ad-35i-sop28.step/stc12c5616ad-35i-sop28.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: STC Micro datasheet (572 pp, sha256
754c84a9d49c2e2d, retrieved 2026-10-21, 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).