STC15W408AS-35I-SOP28

@@ -0,0 +1,76 @@+# STC15W408AS-35I-SOP28++**STC Micro** · Microcontrollers (MCU/MPU/SOC) · SOP-28-300mil++STC15W408AS-35I-SOP28 from STC Micro, in a SOP-28-300mil. 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 | P2.6/CCP1_3 | bidirectional | Standard I/O PORT2[6]. Alternate function CCP1_3: PCA/CCP capture, high-speed pulse output and PWM channel 1 (alternate mux group 3). |+| 2 | P2.7/CCP2_3 | bidirectional | Standard I/O PORT2[7]. Alternate function CCP2_3: PCA/CCP capture, high-speed pulse output and PWM channel 2 (alternate mux group 3). |+| 3 | P1.0/ADC0/CCP1 | bidirectional | Standard I/O PORT1[0]. Muxed with ADC channel 0 input and CCP1 (PCA capture / high-speed pulse output / PWM channel 1). |+| 4 | P1.1/ADC1/CCP0 | bidirectional | Standard I/O PORT1[1]. Muxed with ADC channel 1 input and CCP0 (PCA capture / high-speed pulse output / PWM channel 0). |+| 5 | P1.2/ADC2/SS/ECI/CMPO | bidirectional | Standard I/O PORT1[2]. Alt-functions: ADC channel 2 input; SPI slave-select (SS); PCA external clock input (ECI); comparator output (CMPO). |+| 6 | P1.3/ADC3/MOSI | bidirectional | Standard I/O PORT1[3]. Muxed with ADC channel 3 input and SPI MOSI (master-out slave-in). |+| 7 | P1.4/ADC4/MISO | bidirectional | Standard I/O PORT1[4]. Muxed with ADC channel 4 input and SPI MISO (master-in slave-out). |+| 8 | P1.5/ADC5/SCLK | bidirectional | Standard I/O PORT1[5]. Muxed with ADC channel 5 input and SPI SCLK clock. |+| 9 | P1.6/ADC6/RxD_3/XTAL2/SysClkO_2 | bidirectional | Standard I/O PORT1[6]. Muxed with ADC channel 6, UART RxD (mux group 3), external crystal output XTAL2, and system-clock output SysClkO_2 (SysClk/1, /2, /4). |+| 10 | P1.7/ADC7/TxD_3/XTAL1 | bidirectional | Standard I/O PORT1[7]. Muxed with ADC channel 7, UART TxD (mux group 3), and external crystal input XTAL1 (or external clock input). |+| 11 | P5.4/RST/SysClkO/CMP- | bidirectional | Standard I/O PORT5[4]. Alt-functions: active-high external RESET input (RST, ISP-configurable); system-clock output SysClkO (SysClk/1, /2, /4); comparator negative input CMP- (set as high-Z input when used as comparator). |+| 12 | VCC | power_in | Positive supply. Operating range 2.4 V to 5.5 V. Decouple to GND with a 100 nF ceramic close to the pin. |+| 13 | P5.5/CMP+ | bidirectional | Standard I/O PORT5[5]. Alt-function CMP+: comparator positive input (set the port to high-impedance input when used as CMP+). |+| 14 | GND | power_in | Ground / supply negative reference. |+| 15 | P3.0/RxD/INT4/T2CLKO | bidirectional | Standard I/O PORT3[0]. Muxed with UART RxD (primary), external interrupt INT4 (falling-edge only, supports power-down wake-up), and Timer2 clock output T2CLKO (via INT_CLKO[2]). |+| 16 | P3.1/TxD/T2 | bidirectional | Standard I/O PORT3[1]. Muxed with UART TxD (primary) and Timer2 external clock input T2. |+| 17 | P3.2/INT0 | bidirectional | Standard I/O PORT3[2]. External interrupt 0 (INT0): both edges when IT0=0, falling edge only when IT0=1. Supports power-down wake-up. |+| 18 | P3.3/INT1 | bidirectional | Standard I/O PORT3[3]. External interrupt 1 (INT1): both edges when IT1=0, falling edge only when IT1=1. Supports power-down wake-up. |+| 19 | P3.4/T0/ECI_2 | bidirectional | Standard I/O PORT3[4]. Muxed with Timer0 external clock input T0 and PCA external clock input ECI_2 (mux group 2). |+| 20 | P3.5/T0CLKO/CCP0_2 | bidirectional | Standard I/O PORT3[5]. Alt-functions: Timer0 clock output T0CLKO (via INT_CLKO[0]) and CCP0 (mux group 2) capture / high-speed pulse output / PWM channel 0. |+| 21 | P3.6/INT2/RxD_2/CCP1_2 | bidirectional | Standard I/O PORT3[6]. Alt-functions: external interrupt INT2 (falling-edge only, wake-from-power-down); UART RxD alternate mux group 2; CCP1 mux group 2. |+| 22 | P3.7/INT3/TxD_2/CCP2/CCP2_2 | bidirectional | Standard I/O PORT3[7]. Alt-functions: external interrupt INT3 (falling-edge only, wake-from-power-down); UART TxD alternate mux group 2; CCP2 (primary) and CCP2_2 capture / high-speed pulse output / PWM channel 2. |+| 23 | P2.0/RSTOUT_LOW | bidirectional | Standard I/O PORT2[0]. After power-on and during reset the pin drives low (RSTOUT_LOW). Firmware may then drive it high or low; to read an external state, first set it high before reading. |+| 24 | P2.1/SCLK_2 | bidirectional | Standard I/O PORT2[1]. Alt-function SPI SCLK on alternate mux group 2. |+| 25 | P2.2/MISO_2 | bidirectional | Standard I/O PORT2[2]. Alt-function SPI MISO on alternate mux group 2. |+| 26 | P2.3/MOSI_2 | bidirectional | Standard I/O PORT2[3]. Alt-function SPI MOSI on alternate mux group 2. |+| 27 | P2.4/ECI_3/SS_2 | bidirectional | Standard I/O PORT2[4]. Alt-functions: PCA external clock input ECI mux group 3, and SPI slave-select SS mux group 2. |+| 28 | P2.5/CCP0_3 | bidirectional | Standard I/O PORT2[5]. Alt-function CCP0 (mux group 3): PCA capture / high-speed pulse output / PWM channel 0. |++## Key specifications++| Parameter | Value |+|---|---|+| Manufacturer | STC Micro |+| Package | SOP-28-300mil |+| Category | MCU |+| Pins | 28 |++## Ordering variants++- `STC15W408AS-35I-SOP28`+- `STC15W408AS-35I-SOP28-35I-TSSOP28`+- `STC15W408AS-35I-SOP28-35I-SKDIP28`+- `STC15W408AS-35I-SOP28-35I-QFN28`+- `STC15W408AS-35I-SOP28-35I-SOP20`+- `STC15W408AS-35I-SOP28-35I-TSSOP20`+- `STC15W408AS-35I-SOP28-35I-DIP20`+- `STC15W408AS-35I-SOP28-35I-SOP16`+- `STC15W408AS-35I-SOP28-35I-DIP16`++## CAD (KiCad official)++- Symbol: `STC15W408AS-35I-SOP28`+- Footprint: `Package_SO:SOP-28_8.4x18.16mm_P1.27mm`+- 3D model: SOP-28-300mil (KiCad packages3D, STEP)++## Provenance++Data extracted from the manufacturer datasheet, not a distributor listing:++- **Datasheet:** [STC Micro datasheet](docs/stc15w408as-35i-sop28-datasheet.pdf) (1219 pp, sha256 `cc8c299c891646e0`, retrieved 2026-08-17, 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:** `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/stc15w408as-35i-sop28-datasheet.pdf)

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