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7 月底，乐鑫官方宣布 ESP32-S31 正式量产上架。这颗芯片是乐鑫 2026 年机型矩阵里最受关注的一颗——双核 RISC-V、Wi-Fi 6、蓝牙 5.4、千兆以太网、SIMD 指令集，全都塞进了一片 SoC 里。如果你正在做智能家居中枢、智能音箱或者边缘智能设备，这篇文章帮你把 S31 的底细和整个 ESP32 家族的选型思路一次理清。
S31 到底强在哪？
先看核心规格。ESP32-S31 搭载双核 32 位 RISC-V 处理器，主频最高 320 MHz，其中一个内核兼容 128 位宽数据通路和 SIMD 指令集——这意味着音频滤波、基础视觉处理这类计算密集任务可以显著提速。芯片还集成了一颗 40 MHz 低功耗协处理器，主核休眠时让它盯传感器和按键，是典型的"大小核"省电架构。
存储维度，片上 512 KB SRAM，兼容 250 MHz DDR PSRAM 高速扩展，对外引出 60 个 GPIO。对做中控屏、面板类机型的工程师来说，这个规格跑 GUI 加业务逻辑是比较宽裕的。
连接能力是 S31 的重头戏：Wi-Fi 6（2.4 GHz）、蓝牙 5.4（兼容 LE Audio 和经典 BR/EDR）、IEEE 802.15.4（Zigbee/Thread）三合一，还集成了千兆以太网 MAC，并原生兼容基于 Wi-Fi 和 Thread 的 Matter 协议。一套芯片同时覆盖无线三协议加有线以太网，做全屋智能网关基本不用外挂第二颗通信芯片。
人机交互外围也很齐：DVP 摄像头接口、多种 LCD 接口、最多 14 路电容触摸、硬件 JPEG 编解码器、2D 图形加速器，双 I2S 控制器还能做硬件级蓝牙音频同步。做智能音箱、带屏面板这类机型，外围几乎不用加东西。
放到全家桶里看：2026 选型地图
单看一颗芯片容易迷路，把它放回 ESP32 家族就清晰了：
- ESP32-P4：家族算力天花板，双核 400 MHz RISC-V，主打 HMI、多媒体和轻量边缘视觉，兼容 H.264、MIPI 摄像头和表明屏。注意它没有射频，无线要外挂一颗协处理器（常见组合是 P4 + C5 双芯片）。合适高表现带屏终端，不合适简单节点——杀鸡用牛刀只会增加 BOM 成本和双固件维护负担。
- ESP32-S31：本次主角，算力、多媒体、多协议无线全都要，单芯片思路的首选。售价自然也高一档。
- ESP32-C5：2025 年量产，单核 240 MHz，家族里第一颗双频 Wi-Fi 6（2.4G + 5G）SoC，带 BLE 5 和 802.15.4。2.4G 频段拥挤的情形（公寓、商场）里 5G 频段是真刚需，性价比高。
- ESP32-E22：今年 6 月刚拿到 Wi-Fi 6E 认证的新星，三频 Wi-Fi 6E（2.4/5/6 GHz），2×2 MU-MIMO、160 MHz 带宽、速率最高 2.4 Gbps。它定位是无线连接协处理器（RCP），借助 PCIe 或 SDIO 挂在主处理器旁边，还配套开源 Linux 驱动——给 Linux 网关和路由类机型升级无线时值得重点关注。
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ESP32-H4 / H21：低功耗路线，蓝牙 5.4 LE + 802.15.4，集成 DC-DC，主打电池供电设备和 Matter over Thread 终端。做传感器、开关、门锁选这条线。
一句话总结选型逻辑：看带宽和算力需要往哪个台阶落——电池节点选 H 系列，双频 Wi-Fi 选 C5，单芯片全能旗舰选 S31，重度 HMI/视觉选 P4（加协处理器），Linux 网关升级无线挂 E22。
背后的牌局
从乐鑫半年报也能看出节奏：上半年营收 14.81 亿元、同比增长 18.88%，归母净利润 3.34 亿元、增长 27.93%，二季度单季创历史新高；研发投入 3.3 亿元、同比增长 22.9%，在研项目集中在 RISC-V 端侧 AI 芯片和 Wi-Fi 7 平台。按官方目标，2027 年年中将具备 Wi-Fi 7 能力。
还有一个信号值得注意：乐鑫业绩增长"并非由单一机型周期驱动"，而是机型组合变宽、开发者生态变大。M5Stack 系列已有超过 400 款机型、保持每周上新。对工程师来说这是好事——选型不怕冷门，社区资料和长期供货都相对有保障。
总结一句：S31 的量产标志着乐鑫把"单芯片跑满 AIoT 全家桶"这条路走通了。如果你的下一款机型带屏、带音频、还要多协议组网，S31 值得先进你的候选清单；选型时记得对照自家机型的带宽和算力台阶，别为用不上的表现买单。
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At the end of July, Espressif officially announced the mass production and launch of the ESP32-S31. This chip is the most anticipated device in the 2026 model lineup — featuring dual-core RISC-V, Wi-Fi 6, Bluetooth 5.4, Gigabit Ethernet, and SIMD instruction set, all packed into a single SoC. If you are working on smart home hubs, intelligent speakers, or edge computing devices, this article will break down the details of the S31 and the broader ESP32 family selection strategy.
S31 到底强在哪？
Let’s start with the core specifications. The ESP32-S31 comes with dual 32-bit RISC-V processors clocked up to 320 MHz, with one core supporting a 128-bit wide data path and SIMD instruction set — meaning compute-intensive tasks like audio filtering and basic vision processing can be significantly accelerated. It also includes a 40 MHz low-power coprocessor for monitoring sensors and buttons while the main core is idle, forming a typical “big-little” architecture for power saving.
In terms of memory, the chip features 512 KB of on-chip SRAM and supports high-speed expansion via a 250 MHz DDR PSRAM interface, plus 60 external GPIO pins. For engineers working on control panels or display-centric devices, this memory configuration provides ample room for running a GUI alongside application logic.
Connectivity is where the S31 truly shines: it integrates Wi-Fi 6 (2.4 GHz), Bluetooth 5.4 (compatible with LE Audio and classic BR/EDR), and IEEE 802.15.4 (Zigbee/Thread), alongside a Gigabit Ethernet MAC. The chip also natively supports Matter, allowing for seamless integration of both wireless and wired communication protocols in a single package — ideal for building full-house smart hubs without needing extra transceivers.
On the human-computer interaction front, the S31 is fully equipped: it supports DVP cameras, multiple LCD interfaces, up to 14 capacitive touch channels, hardware JPEG encoding/decoding, 2D graphics acceleration, and dual I2S controllers for synchronized Bluetooth audio. For applications like smart speakers or touchscreen panels, almost no additional peripherals are required.
Comparing the S31 to the broader family: the 2026 selection map
Looking at a single chip in isolation can be confusing; placing the S31 within the ESP32 ecosystem clarifies its position.
The ESP32-P4 represents the performance pinnacle of the family, featuring dual 400 MHz RISC-V cores optimized for HMI, multimedia, and lightweight edge vision tasks. However, it lacks built-in radio frequency capability — meaning wireless functions require pairing with an external coprocessor (typically the C5). This setup is best suited for high-performance terminals requiring intensive graphics or vision processing, but not for simple nodes where the extra cost and dual-firmware maintenance would be overkill.
The ESP32-S31, as discussed, is the all-in-one solution that covers both compute and wireless connectivity, making it the go-to choice for single-chip designs — though naturally, this versatility comes at a higher price point.
The ESP32-C5, released in 2025, offers single-core 240 MHz performance with dual-band Wi-Fi 6 (2.4G + 5G) and BLE 5. The availability of the 5G band is a significant advantage in crowded environments (like apartments or malls), providing a high-value option for cost-sensitive yet high-performance requirements.
The ESP32-E22 is a newcomer (June 2024 certified) specializing in Wi-Fi 6E with tri-band support (2.4, 5, 6 GHz), MU-MIMO, and up to 2.4 Gbps throughput. It is designed as a Wireless Connectivity Processor (WCP), connecting via PCIe or SDIO to a main processor — perfect for upgrading existing Linux gateways or routers without replacing the entire compute platform.
The ESP32-H4 / H21 series focuses on low-power operation, combining Bluetooth 5.4 LE and 802.15.4 with integrated DC-DC converters. These are targeted toward battery-operated devices and Matter-over-Thread terminals, such as sensors, switches, and lock mechanisms.
In summary, the selection logic depends on the required bandwidth and compute power: battery-powered nodes should use the H series; dual-band Wi-Fi needs point to the C5; the S31 is the flagship for all-in-one designs; heavy HMI/vision workloads benefit from the P4 (with coprocessor); and Linux gateway upgrades call for the E22.
背后的牌局
Looking at Espressif’s financial report, the company’s growth is clearly driven by this expanding product portfolio rather than a single hit device. With over 400 M5Stack-compatible modules available and a steady stream of new models, developers have a rich ecosystem to choose from — ensuring both availability and community support for long-term projects.
The bottom line: the ESP32-S31 successfully marries the full range of AIoT functions into a single chip. If your next project demands screen interaction, audio processing, and multi-protocol networking, the S31 should be at the top of your shortlist — just remember to weigh its capabilities against your actual needs to avoid over-specifying.
Bottom line: S31’s mass production shows Espressif has cracked the "single-chip AIoT full-stack" puzzle. If your next device needs a screen, audio, and multi-protocol networking, S31 should be on your shortlist — but remember to match its capabilities with your actual product requirements to avoid paying for unneeded performance.