The C2 is a chip housed in a 4mm x 4mm package, with 272 kB of memory. It runs frameworks such as ESP-Jumpstart and ESP Rainmaker, and it also runs ESP-IDF. ESP-IDF is Espressif's open source real-time operating system for embedded IoT devices, trusted by users around the world. It is supported by the community of Espressif as well as all ESP32 chips. The ESP32-C2's ROM code has been optimized to reduce the need for flash memory, and the ESP32-C2 also continues Espressif's tradition of excellence in security standards, with features such as secure boot and flash encryption, while also providing a hardware root of trust for any application.
This design enhances RF performance due to reduced parasitics, a relatively small package and chip size. ESP32-C2 can transmit 802.11N MC7 packets (72.2 Mbps) at an output power of 18 dBm. The ESP32-C2 transmits low data rates with an FCC limit of 20 dBm. For 1 Mbps 802.11B packets, typical receiver sensitivity is between -97 and -100 dBm. Receive current is 58 mA.
Routers usually have better transmitters than client devices (here, devices connected to the router). However, client devices connected to the ESP32-C2 can deliver as much output power as the router itself. (Note: We're not talking about multi-antenna routers here.) For most client devices, the 20 dBm output power only supports the low data rate mode. However, in the case of the ESP32-C2, the 20 dBm output power also supports some high data rates, thus reducing transfer times and improving overall connection quality, especially when using many devices.
The maximum distance is determined by the maximum power the device can or is allowed to transmit at the lowest data rate, which is 20 dBm at 802.11b ± 1 Mbps (or 19.5 dBm, sometimes even lower, according to FCC certification standards). If your application requires maximum physical distance (which is the case for most applications), you should check the receive sensitivity and transmit power (802.11b ± 1 Mbps) of the device you are using. The ESP32-C2 takes full advantage of the limitations allowed.
material standard
The Matter standard is designed to run on any IP-capable networking stack. In an upcoming first release, Matter will support Wi-Fi, Thread, and Ethernet protocols.
Here are the pros and cons of using Matter Wi-Fi vs Matter Thread:
Advantages of Wi-Fi
1. Low latency, high throughput
2. Due to the high availability of Wi-Fi routers, most applications can be supported.
Wi-Fi disadvantages
High power consumption, difficult to support battery power
Without additional mesh protocols, the size of the network will be limited.
thread advantage
1. Low power consumption, support battery power supply
2. Support mesh network (up to 250 devices)
threading disadvantages
1. Requires a Thread Border router to run everything, still requires a Wi-Fi connection (or some other form of network connection).
2. Low throughput and high latency
Because wireless networking is ubiquitous in most places, the migration of existing Wi-Fi-based devices to the Matter Wi-Fi standard is likely to drive early adoption of the Matter standard. For this reason, the ESP32-C2, a low-cost Wi-Fi chip that supports the Matter standard, will certainly be considered particularly valuable.
Development board https://item.taobao.com/item.htm?spm=a2oq0.12575281.0.0.5c131debYR3xV9&ft=t&id=688271301869