STC8G1K08-38I-TSSOP20

@@ -0,0 +1,61 @@+# STC8G1K08-38I-TSSOP20++**STC Micro** · Microcontrollers (MCU/MPU/SOC) · TSSOP-20++STC8G1K08-38I-TSSOP20 from STC Micro, in a TSSOP-20. Pinout and pin descriptions extracted from the manufacturer datasheet by ds2sf; symbol, footprint, and 3D from KiCad-official CAD.++## Pinout++| Pin | Name | Type | Function |+|---|---|---|---|+| 1 | P1.2/ADC2/SS/T2/ECI | bidirectional | General-purpose I/O P1.2. Muxed alt-functions: ADC channel 2 (analog input), SPI slave-select SS (I/O), Timer 2 external clock input (T2), and PCA external pulse input (ECI). Post-reset state: high-impedance input. |+| 2 | P1.3/ADC3/T2CLKO/MOSI | bidirectional | General-purpose I/O P1.3. Muxed alt-functions: ADC channel 3, Timer 2 clock-divider output (T2CLKO), and SPI master-out/slave-in (MOSI, I/O). |+| 3 | P1.4/ADC4/MISO/SDA | bidirectional | General-purpose I/O P1.4. Muxed alt-functions: ADC channel 4, SPI master-in/slave-out (MISO, I/O), and I2C data line (SDA, I/O, open-drain when used as I2C). |+| 4 | P1.5/ADC5/SCLK/SCL | bidirectional | General-purpose I/O P1.5. Muxed alt-functions: ADC channel 5, SPI clock (SCLK, I/O), and I2C clock line (SCL, I/O). |+| 5 | P1.6/ADC6/RxD_3/MCLKO_2/XTALO | bidirectional | General-purpose I/O P1.6. Muxed alt-functions: ADC channel 6, UART1 RxD alternate mapping 3, master-clock divider output (MCLKO_2), and external crystal output (XTALO) when using an external HSE crystal. |+| 6 | P1.7/ADC7/TxD_3/XTALI | bidirectional | General-purpose I/O P1.7. Muxed alt-functions: ADC channel 7, UART1 TxD alternate mapping 3, and external crystal input (XTALI) when using an external HSE crystal. |+| 7 | P5.4/NRST/MCLKO | bidirectional | General-purpose I/O P5.4. Alt-functions: active-low external reset input (NRST, low-level reset) when configured as reset pin, or master-clock divider output (MCLKO). When used as reset, the internal ~4 kΩ pull-up stays on; when used as I/O, that pull-up still enables for ~6.5 ms on power-up before auto-disable. |+| 8 | Vcc/AVcc/ADC_VRef+ | power_in | Combined chip power supply (Vcc), analog ADC supply (AVcc) and ADC positive reference (ADC_VRef+). Operating supply 2.7-5.5 V typical for the STC8G family; this -38I variant is characterised over the 3.8-5.5 V industrial range. ADC_VRef+ must be tied to an external reference between 2.4 V and Vcc (floating causes leakage). Decouple with 10 µF bulk + 0.1 µF close to the pin. |+| 9 | P5.5 | bidirectional | General-purpose I/O P5.5, no alt-functions on this package. Post-reset state: high-impedance input. |+| 10 | Gnd/AGnd | power_in | Combined digital and analog ground return. Digital Gnd and analog AGnd are bonded to a single package pin on TSSOP20. |+| 11 | P3.0/RxD/ADC8/INT4 | bidirectional | General-purpose I/O P3.0. Muxed alt-functions: UART1 receive (RxD), ADC channel 8, and external interrupt 4 (INT4). After power-on P3.0 comes up in weak-pull-up / quasi-bidirectional mode (unlike other pins). |+| 12 | P3.1/TxD/ADC9 | bidirectional | General-purpose I/O P3.1. Muxed alt-functions: UART1 transmit (TxD, output) and ADC channel 9. After power-on P3.1 comes up in weak-pull-up / quasi-bidirectional mode. |+| 13 | P3.2/INT0/ADC10/SCL_4/SCLK_4 | bidirectional | General-purpose I/O P3.2. Muxed alt-functions: external interrupt 0 (INT0), ADC channel 10, I2C clock alternate mapping 4 (SCL_4), and SPI clock alternate mapping 4 (SCLK_4). |+| 14 | P3.3/INT1/ADC11/SDA_4/MISO_4 | bidirectional | General-purpose I/O P3.3. Muxed alt-functions: external interrupt 1 (INT1), ADC channel 11, I2C data alternate mapping 4 (SDA_4), and SPI MISO alternate mapping 4 (MISO_4). |+| 15 | P3.4/T0/T1CLKO/ADC12/ECI_2/CMPO/MOSI_4 | bidirectional | General-purpose I/O P3.4. Muxed alt-functions: Timer 0 external clock input (T0), Timer 1 clock-divider output (T1CLKO), ADC channel 12, PCA external pulse input alternate 2 (ECI_2), comparator output (CMPO), and SPI MOSI alternate mapping 4 (MOSI_4). |+| 16 | P3.5/T1/T0CLKO/ADC13/CCP0_2/SS_4 | bidirectional | General-purpose I/O P3.5. Muxed alt-functions: Timer 1 external clock input (T1), Timer 0 clock-divider output (T0CLKO), ADC channel 13, PCA CCP0 capture/compare/PWM alternate mapping 2 (CCP0_2), and SPI slave-select alternate mapping 4 (SS_4). |+| 17 | P3.6/INT2/RxD_2/ADC14/CCP1_2/CMP- | bidirectional | General-purpose I/O P3.6. Muxed alt-functions: external interrupt 2 (INT2), UART1 RxD alternate mapping 2, ADC channel 14, PCA CCP1 alternate mapping 2 (CCP1_2), and comparator negative input (CMP-). |+| 18 | P3.7/INT3/TxD_2/CCP2/CCP2_2/CMP+ | bidirectional | General-purpose I/O P3.7. Muxed alt-functions: external interrupt 3 (INT3), UART1 TxD alternate mapping 2, PCA CCP2 capture/compare/PWM (default and alternate 2 mappings), and comparator positive input (CMP+). Also serves as internal ADC15 reference tap (1.19 V bandgap) when configured for internal-reference measurements. |+| 19 | P1.0/RxD2/ADC0/CCP1 | bidirectional | General-purpose I/O P1.0. Muxed alt-functions: UART2 receive (RxD2), ADC channel 0, and PCA CCP1 capture/compare/PWM (default mapping). |+| 20 | P1.1/TxD2/ADC1/CCP0 | bidirectional | General-purpose I/O P1.1. Muxed alt-functions: UART2 transmit (TxD2), ADC channel 1, and PCA CCP0 capture/compare/PWM (default mapping). |++## Key specifications++| Parameter | Value |+|---|---|+| Manufacturer | STC Micro |+| Package | TSSOP-20 |+| Category | MCU |+| Pins | 20 |++## Ordering variants++- `STC8G1K08-38I-TSSOP20`+- `STC8G1K08-38I-TSSOP20STC8G1K08-38I-QFN20`+- `STC8G1K08-38I-TSSOP20STC8G1K08-38I-SOP16`++## CAD (KiCad official)++- Symbol: `STC8G1K08-38I-TSSOP20`+- Footprint: `Package_SO:TSSOP-20_4.4x6.5mm_P0.65mm`+- 3D model: TSSOP-20 (KiCad packages3D, STEP)++## Provenance++Data extracted from the manufacturer datasheet, not a distributor listing:++- **Datasheet:** [STC Micro datasheet](docs/stc8g1k08-38i-tssop20-datasheet.pdf) (1240 pp, sha256 `7d5e82c9f651aa92`, retrieved 2026-08-17, tier: lcsc)+- **Extractor:** `ds2sf` (Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate.+- **CAD:** KiCad official libraries (CC-BY-SA 4.0).++[Datasheet PDF](docs/stc8g1k08-38i-tssop20-datasheet.pdf)

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