TXW818

The TXW818 is a low-power, high-performance, highly integrated 2.4GHz Wi-Fi and small wireless multi-mode IoT SOC chip. It integrates IEEE 802.11 b/g/n baseband and RF circuits, including a power amplifier (PA), low noise amplifier (LNA), RF balun, antenna switch, and power management module.

The TXW818 Wi-Fi baseband implements Orthogonal Frequency Division Multiplexing (OFDM) technology, compatible with Direct Sequence Spread Spectrum (DSSS) and Complementary Code Keying (CCK) technologies, supporting the IEEE 802.11 b/g/n protocol. It supports a standard bandwidth of 20MHz and narrow bandwidths of 5MHz/10MHz, providing a maximum physical layer rate of 72.2Mbit/s.

The TXW818 chip integrates a high-performance 32-bit microprocessor with built-in MJPEG (supporting VGA/720P) and offers a rich set of peripheral interfaces, including DVP, LCD, USB2.0 High Speed Host/Device, SDMMC Host, SDIO2.0 Slave, RMII MAC, SPI Master & Device, UART, IIC, IIS, PDM, IR Send/Receive, PWM, GPIO, and standard and audio ADC/DACs.

Features

Wi-Fi MAC & PHY

• Supports IEEE 802.11 b/g/n standards
• Supports 1T1R mode with data rates up to 72.2Mbps
• Excellent transmission power and reception sensitivity
• Built-in PA, LNA, and RF switch
• Supports STA, AP, AP+STA (relay), STA+STA functions
• Frame aggregation (TX/RX A-MPDU, RX A-MSDU)
• Supports RX STBC (Space Time Block Coding)
• Supports WPA/WPA2/WPA3

BLE

• Supports fast Bluetooth network configuration
• Supports Wi-Fi/BLE PTA coexistence

Video

• Supports video data sources via DVP, UVC, SPI camera input
• One MJPEG encoder, supporting a maximum resolution of 1920*1080 @ 30fps
• One MJPEG codec, supporting a maximum resolution of 1920*1080 @ 30fps
• Supports time watermark, colorful photo frame, motion detection, and optical flow algorithm hardware acceleration

Audio

• Supports single-ended and differential input high-performance analog microphones with built-in PGA.
• 1 delta-sigma audio ADC.
• 1 delta-sigma audio DAC.
• Supports sampling rates of 8/11.025/12/16/22.05/24/32/44.1/48 kHz.

LCD

• Supports RGB interface, MCU8080 interface, and MCU6800 interface for LCD screen display.
• Supports image scaling, 90/180/270-degree rotation, and horizontal and vertical mirroring.
• Supports image OSD (On-Screen Display) and alpha blending.
• Supports CCM (Color Correction Matrix), gamma correction, saturation, and contrast adjustment.

MCU

• CK803 CPU, maximum clock speed 240MHz
• 272KB SRAM
• Supports various external frequency crystal oscillators and shared crystal oscillator input with the system main control chip
• Supports RTC
• Supports 32KHz crystal oscillator
• 17 timers
• Supports ULP and LP low power modes with ULP mode current < 28uA @25°C, and multiple IO wake-up support
• Built-in temperature sensor
• Built-in LVD detection
• Built-in watchdog
• 48-bit unique chip ID (UID)

Peripherals

• 20 programmable GPIOs, support edge or level triggered interrupts
• One 12-bit ADC, can be multiplexed as DAC
• One 12-bit analog comparator
• One QSPI, support external SPI FLASH and PSRAM
• 2 I2S/PCM
• 1 PDM
• 1 SDIO2.0 High Speed Device
• 1 SD Host Controller
• 1 USB2.0 High Speed Device
• 3 SPI interfaces Master/Slave (2 configurable as IIC Master/Slave)
• 3 UART interfaces (1 supports flow control and RS485)
• 2 infrared transmitters (1 supports IrDA) and multiple receivers
• 14 PWM outputs (multiplexed with timer), including 4 independent 16-bit PWM, support low power mode PWM

Boot Interfaces

• SDIO2.0 Device、USB2.0 Device、SPI Slave、UART
• SPI FLASH

Data Security

• Support for AES 128/192/256 ECB/CBC/CTR encryption and decryption
• Support for SHA256
• Support for 5/7/8/16/32-bit CRC checking
• Support for SPI Flash firmware encryption protection
• TRNG (True Random Number Generator)

Temperature Range

• -40°C to 85°C

Package Options

Model	Package	SRAM	Flash	PSRAM	USB2.0	DVP	MJPEG Codec	SDIO	LCD	Low Power
TXW818-C04L	QFN68	272KB		4MB	✔️	✔️	✔️	✔️	✔️	✔️
TXW818-C08L	QFN68	272KB		8MB	✔️	✔️	✔️	✔️	✔️	✔️