Datasheet
Table Of Contents
- Product Overview
- 1 ESP32-C3 Series Comparison
- 2 Pin Definition
- 3 Functional Description
- 3.1 CPU and Memory
- 3.2 System Clocks
- 3.3 Analog Peripherals
- 3.4 Digital Peripherals
- 3.4.1 General Purpose Input / Output Interface (GPIO)
- 3.4.2 Serial Peripheral Interface (SPI)
- 3.4.3 Universal Asynchronous Receiver Transmitter (UART)
- 3.4.4 I2C Interface
- 3.4.5 I2S Interface
- 3.4.6 Remote Control Peripheral
- 3.4.7 LED PWM Controller
- 3.4.8 General DMA Controller
- 3.4.9 USB Serial/JTAG Controller
- 3.4.10 TWAI® Controller
- 3.5 Radio and Wi-Fi
- 3.6 Bluetooth LE
- 3.7 Low Power Management
- 3.8 Timers
- 3.9 Cryptographic Hardware Accelerators
- 3.10 Physical Security Features
- 3.11 Peripheral Pin Configurations
- 4 Electrical Characteristics
- 5 Package Information
- 6 Related Documentation and Resources
- Revision History
3 Functional Description
• antenna matching
These built-in calibration routines reduce the cost, time, and specialized equipment required for product
testing.
3.5.3 Clock Generator
The clock generator produces quadrature clock signals of 2.4 GHz for both the receiver and the transmitter. All
components of the clock generator are integrated into the chip, including inductors, varactors, filters, regulators
and dividers.
The clock generator has built-in calibration and self-test circuits. Quadrature clock phases and phase noise are
optimized on chip with patented calibration algorithms which ensure the best performance of the receiver and the
transmitter.
3.5.4 WiFi Radio and Baseband
ESP32-C3 Wi-Fi radio and baseband support the following features:
• 802.11b/g/n
• 802.11n MCS0-7 that supports 20 MHz and 40 MHz bandwidth
• 802.11n MCS32
• 802.11n 0.4 µs guard interval
• data rate up to 150 Mbps
• RX STBC (single spatial stream)
• adjustable transmitting power
• antenna diversity
ESP32-C3 supports antenna diversity with an external RF switch. This switch is controlled by one or more
GPIOs, and used to select the best antenna to minimize the effects of channel imperfections.
3.5.5 WiFi MAC
ESP32-C3 implements the full 802.11 b/g/n Wi-Fi MAC protocol. It supports the Basic Service Set (BSS) STA
and SoftAP operations under the Distributed Control Function (DCF). Power management is handled
automatically with minimal host interaction to minimize the active duty period.
ESP32-C3 Wi-Fi MAC applies the following low-level protocol functions automatically:
• 4 × virtual Wi-Fi interfaces
• infrastructure BSS in Station mode, SoftAP mode, Station + SoftAP mode, and promiscuous mode
• RTS protection, CTS protection, Immediate Block ACK
• fragmentation and defragmentation
• TX/RX A-MPDU, TX/RX A-MSDU
• transmit opportunity (TXOP)
• Wi-Fi multimedia (WMM)
• GCMP, CCMP, TKIP, WAPI, WEP, BIP, WPA2-PSK/WPA2-Enterprise, and WPA3-PSK/WPA3-Enterprise
• automatic beacon monitoring (hardware TSF)
Espressif Systems 25
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ESP32-C3 Series Datasheet v1.2