65 lines
2.6 KiB
Markdown
65 lines
2.6 KiB
Markdown
# ESP32-S2 Specifications
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> **芯片：esp32-s2** | **类别：specs** | **信源：** [Espressif 官方文档](https://docs.espressif.com)
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## 1. Core Architecture
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- **CPU:** Single-core Xtensa® LX7, 240 MHz.
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- **Wireless:** 802.11 b/g/n (Wi-Fi 4). **Note: No Bluetooth support.**
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- **协处理器:** ULP-RISC-V 协处理器
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- **Application:** Ultra-low power designs and projects requiring native USB OTG/HID.
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## 2. Memory & Storage
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- **SRAM:** 320 KB internal.
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- **ROM:** 128 KB.
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- **RTC SRAM:** 16 KB（Deep-sleep 可保持）
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- **PSRAM:** Supports external PSRAM via SPI/QPI, max 8 MB.
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- **外部 Flash:** max 16 MB QSPI.
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## 3. Peripheral Mapping
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- **GPIO Count:** 43.
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- **ADC:** 20 channels, 12-bit（ADC1: GPIO1–10, ADC2: GPIO11–20）.
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- **DAC:** 2 channels, 8-bit（GPIO17/18）.
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- **Touch:** 14 capacitive touch channels.
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- **USB OTG:** Full-Speed USB 2.0（GPIO19=D-, GPIO20=D+）.
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- **Hardware PWM:** LEDC 8ch + MCPWM ×2.
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- **UART:** 2 controllers.
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- **I2C:** 2 controllers.
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- **SPI:** 4 controllers.
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- **I2S:** 1 controller.
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- **CAN (TWAI):** 1 controller.
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- **LCD 接口:** 8-bit i80 / RGB.
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- **DVP Camera:** 8-bit.
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## 4. Hardware Safety & Constraints
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- **ADC2/WiFi Conflict:** ADC2 readings are invalid when Wi-Fi is active. Use ADC1 (GPIO1–10).
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- **无蓝牙:** 这是与 ESP32 最大的区别，选型时注意。
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- **Flash Pins:** GPIO26–32（模组内部占用）。
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- **Strapping Pins:** GPIO0（启动模式）, GPIO45（VDD_SPI电压）, GPIO46（仅输入+日志控制）。
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- **GPIO46:** 仅输入，不能做输出。
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- **USB Pins:** Reserve GPIO19/20 if using native USB functionality.
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- **供电:** 2.7–3.6V, 推荐 3.3V, 纹波 <75mVpp.
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- **工作温度:** −40°C ~ +85°C.
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- **封装:** QFN56 (7×7mm).
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### 功耗详情（3.3V, 25°C）
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- Active TX 802.11b：条件=20MHz, 1Mbps, +19.5dBm, 电流=**310 mA**
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- Active TX 802.11g：条件=20MHz, 54Mbps, +15dBm, 电流=220 mA
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- Active TX 802.11n：条件=20MHz, MCS7, +13dBm, 电流=200 mA
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- Active RX：条件=802.11b/g/n, 20MHz, 电流=**63 mA**
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- Modem-sleep：条件=CPU 240MHz idle, 外设时钟关, 电流=20 mA
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- Modem-sleep：条件=CPU 160MHz idle, 外设时钟关, 电流=14 mA
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- Light-sleep：电流=**750 µA**
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- Deep-sleep：条件=RTC timer + RTC memory, 电流=**22 µA**
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- Deep-sleep：条件=RTC timer only, 电流=**25 µA**
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- Shutdown：条件=CHIP_PU 拉低, 电流=**20 µA**
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### TX 功率
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- 802.11b：最大 TX Power=+19.5 dBm
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- 802.11n：最大 TX Power=+18.0 dBm
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## 5. 与 ESP32 的关键差异
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- 核心数：ESP32=双核, ESP32-S2=单核
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- 蓝牙：ESP32=BR/EDR+BLE, ESP32-S2=❌ 无
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- USB OTG：ESP32=❌, ESP32-S2=✅
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- GPIO 总数：ESP32=34, ESP32-S2=43
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