ESP32-C6

The IoT all-rounder: Wi-Fi 6 + BLE 5.3 + 802.15.4 (Zigbee 3.0 / Thread 1.3 / Matter) in one chip, plus a low-power RISC-V core. The single-chip smart-home pick.

Espressif's own datasheet describes the ESP32-C6 as "a low-power and cost-effective 2.4 GHz Wi-Fi 6 + Bluetooth 5 (LE) + Thread/Zigbee SoC, with a 32-bit RISC-V core, for securely connected devices." It is the successor to the ESP32-C3 in Espressif's single-core RISC-V line, and the first Espressif chip to combine Wi-Fi 6 with an 802.15.4 radio, which makes it the reference part for Matter-over-Thread and Matter-over-Wi-Fi end devices that also need a classic Wi-Fi fallback.

CPU and memory

The ESP32-C6 carries two 32-bit RISC-V cores. The high-performance (HP) core is a 4-stage-pipeline design clocked up to 160 MHz and runs the main application, Wi-Fi/BLE/802.15.4 stacks, and ESP-IDF. A separate low-power (LP) core, a simpler 2-stage-pipeline RISC-V design clocked up to 20 MHz, can keep running sensor polling, timers, or simple logic while the HP core is powered down, which is what makes the chip's deep-sleep current so low. On-chip memory is 512 KB of HP SRAM plus a dedicated 16 KB LP SRAM (reachable by either core) for code and data, backed by 320 KB of mask ROM for boot and core routines.

Radio stack

All three radios share a single 2.4 GHz antenna (time-multiplexed, not simultaneous):

• Wi-Fi 6 (802.11ax), 2.4 GHz only, 1T1R, with data rates up to 150 Mbps and backward compatibility with 802.11b/g/n. Wi-Fi 6's Target Wake Time (TWT) lets battery-powered nodes negotiate wake schedules with the access point, which is the main reason Wi-Fi 6 lowers average power draw versus 802.11n on comparable traffic.
• Bluetooth LE 5.3 (certified), LE only — there is no Bluetooth Classic on this chip.
• IEEE 802.15.4-2015 radio, running either a Zigbee 3.0 or a Thread 1.3 network stack. Combined with the Wi-Fi and BLE radios, this is what lets the ESP32-C6 act as a Matter-compliant Wi-Fi end device or a Matter-over-Thread end device from the same silicon.

GPIO and peripherals

The standard QFN40 package exposes up to 30 GPIO pads (a smaller QFN32 variant exposes 22); a handful are reserved as strapping pins or tied to off-chip flash/USB signals — see reserved_pins in this record. Peripheral set: a 12-bit SAR ADC with up to 7 channels, two general-purpose UARTs plus an LP UART, a general SPI controller plus two dedicated SPI buses for external flash/PSRAM, I2C and LP I2C, I2S, two TWAI (CAN 2.0-compatible) controllers, an SDIO slave, LED PWM (up to 6 channels), MCPWM, RMT, and PARLIO. USB connectivity is via the native USB Serial/JTAG controller — flashing, console, and JTAG debugging over a single USB connection, no external USB-to-serial bridge chip required.

Low-power design

Alongside Active mode, the ESP32-C6 supports Modem-sleep, Light-sleep, and Deep-sleep. In Deep-sleep, Espressif specifies power consumption as low as 7 µA, with the LP core and LP SRAM still able to run and wake the HP core on a timer, GPIO, or other event. This power profile, combined with Wi-Fi 6 TWT and 802.15.4's naturally low duty cycles, is what Espressif targets at coin-cell and battery-powered sensor/end-node designs.

Security

Hardware security features include RSA-3072-based secure boot, AES-128/256-XTS flash encryption, ECC, HMAC, SHA, and an RSA digital-signature peripheral, plus a hardware RNG — see the security field above for the full list as tracked in this record. Cryptographic key material is backed by 4096 bits of eFuse (1792 bits available to users), Espressif's one-time-programmable storage for keys and device identity.

Typical use cases

Espressif's stated application targets for the ESP32-C6 include smart home, industrial automation, healthcare, consumer electronics, smart agriculture, POS machines, service robots, audio devices, and generic low-power IoT sensor hubs and data loggers. In practice the chip's combination of Wi-Fi 6, BLE, and 802.15.4 on one die makes it most common as a Matter/Thread border-adjacent end device or Zigbee end device in smart-home and building-automation products, and as a Wi-Fi sensor node where Target Wake Time and deep-sleep current matter for battery life.