• IC feature page.
  • Main features: Wifi embedded + 160Mhz ARM M3 + 448KB RAM, rich interface and great extensive capability
  • Run UC-OS II system
  • NL6621M is a SOC of high integration, dedicated to wireless LAN products of high data throughput and low cost. It integrates MCU,MAC,1T1R baseband and RF transceiver with amplifier onto one chip.
  • NL6621M supports 802.11b/ g n and Wi-Fi direct(SDIO network card mode),BSS STA,soft AP,WiFi protection setup. Also it supports WMM-PS and WPA/ WPA2 security protocol.
  • NL6621M can serve as slave controlled by main processor, or independent WLAN device needing no other processors.
  • The general purpose interfaces it supported include QuadSPI,standard SPI,I2C,UART,GPIO,I2S audio and PWM audio.
  • NL6621M can be directly connected to plentiful peripheral equipment such as sound box,pick-up head,flash memory and LCD, etc. Plentiful internet protocols such as TCP/ IP, UPD and HTTP, etc. have been integrated to nl6621m. With high-performance transmission over radio, plentiful interfaces and protocols,
  • NL6621M is a best choice for monolithic chip solution such as wireless audio, wireless video, wireless wisdom household and wireless medical treatment, etc.
  • Secondary development: Complete open source, Standar_SDK,Wifi-Uart_SDK,Apple Homekit_SDK,Gizwits_SDK (mostly in Chinese for now)
  • SDK mostly in C, and complied in Keil.
  • Default firmware is AT commands


  • The basic frequency can be configured as: 160M,120M,80M,40M;
  • 448KB RAM(CODE RAM is 192K)to be used by WLAN and application custom-built by client

Wi-Fi network operation mode:

  • 1.BSS STA
  • 2.Soft BSS AP
  • 3.WIFI direct(SDIO net card mode)
  • 4.Ad hoc
  • 5.DirectConfig Quick configuration by one key

Speed Protocol Supported:

  • 1.802.11b: 1,2,5.5,11Mbps
  • 2.802.11g: 6,9,12,18,24,36,48,54Mbps
  • 3.802.11n:  6.5Mbps-65Mbps, 7.2Mbps-72.2Mb


  • UART, which can be used as high speed data or control interface
  • I2C, which can externally connect EEPROM storage chip
  • SPI interface, which can externally connect display module of SPI interface
  • 32 GPIO interfaces at most (but NOT all lead out on this one)
  • Integrate 2 channels of PWM
  • 1 hardware timer and 1 hardware watchdog

Application area

  • Smart security guard
  • Internet household appliances
  • Smart toys
  • WIFI lamp
  • Smart card terminal
  • WIFI sound box

Basic setup and wiring:

Use only a USB to TTL, are 3.3V, GND, UTXD, URXD, the power module can work normally. The default baud rate is 115200.


Additional information

Weight 0.01 kg

1 review for NL6621 Wifi Module

  1. 5 out of 5

    narioinc89 (verified owner)

    works like a charm with arduino. got connected quickly with a little help from google and forums and was running POST and GET requests to my web server. I am yet to download their firmware SDK and take it for a spin. Hopefully its as good as the one from espressif for the almighty 8266

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