Initial: knowledge base

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+# ESP32-S3 Specifications
+> **芯片：esp32-s3** | **类别：specs** | **信源：** [Espressif 官方文档](https://docs.espressif.com)
+
+## 1. Core Architecture
+- **CPU:** Dual-core Xtensa® LX7, 240 MHz.
+- **Wireless:** 802.11 b/g/n (Wi-Fi 4), BLE 5.0 (Mesh support).
+- **Acceleration:** AI Vector instructions for accelerated ML and complex GUI rendering.
+- **协处理器:** ULP-RISC-V 协处理器.
+- **Application:** High-performance IoT, AI on the edge, and multimedia GUIs.
+
+## 2. Memory & Storage
+- **SRAM:** 512 KB internal.
+- **RTC SRAM:** 16 KB（Deep-sleep 可保持）.
+- **ROM:** 384 KB.
+- **PSRAM:** Support for Octal SPI PSRAM (max 8 MB) — GPIO33–37 占用.
+- **外部 Flash:** max 16 MB QSPI/OPI.
+
+## 3. Peripheral Mapping
+- **GPIO Count:** 45（GPIO0–21, GPIO26–48）.
+- **ADC:** 20 channels, 12-bit SAR（ADC1: GPIO1–10, ADC2: GPIO11–20）.
+- **DAC:** **None.**（注意：S3 无 DAC！）
+- **Touch:** 14 capacitive touch channels.
+- **USB:** Native USB OTG (GPIO19/20) + USB Serial/JTAG（双 USB 控制器）.
+- **Hardware PWM:** LEDC 8ch and MCPWM ×2.
+- **UART:** 3 controllers.
+- **I2C:** 2 controllers.
+- **SPI:** 4 controllers.
+- **I2S:** 2 controllers.
+- **CAN (TWAI):** 2 controllers.
+- **LCD Interface:** Supports RGB, 8080, and I80 interfaces.
+- **DVP Camera:** 8–16 bit.
+
+## 4. Hardware Safety & Constraints
+- **ADC2/WiFi Conflict:** ADC2 readings are invalid when Wi-Fi is active. Use ADC1 (GPIO1–10).
+- **Flash Pins:** GPIO26–32.
+- **Strapping Pins:** 0, 3, 45, 46.
+- **Octal PSRAM:** May reserve GPIO33–37（SPIIO4–SPIIO7, SPIDQS）. S3R8/S3R8V 模组这些引脚不可用。
+- **JTAG:** GPIO39–42，不与 Strapping 冲突。
+- **供电:** 2.7–3.6V, 推荐 3.3V, 纹波 <75mVpp.
+- **峰值电流:** ~500 mA (WiFi TX).
+- **Deep-sleep:** ~7 µA.
+- **工作温度:** −40°C ~ +85°C.
+- **封装:** QFN56 (7×7mm).
+
+## 5. 与 ESP32/S2 的关键差异
+- 核心数：ESP32=双核, ESP32-S2=单核, ESP32-S3=双核
+- 蓝牙：ESP32=BR/EDR+BLE, ESP32-S2=❌, ESP32-S3=BLE 5.0
+- USB OTG：ESP32=❌, ESP32-S2=✅, ESP32-S3=✅
+- USB Serial/JTAG：ESP32=❌, ESP32-S2=❌, ESP32-S3=✅
+- AI 加速：ESP32=❌, ESP32-S2=❌, ESP32-S3=✅
+- Octal PSRAM：ESP32=❌, ESP32-S2=❌, ESP32-S3=✅
+- DAC：ESP32=✅, ESP32-S2=✅, ESP32-S3=❌
+- GPIO：ESP32=34, ESP32-S2=43, ESP32-S3=45