Microchip's ATWINC3400 is an IEEE 802.11 b/g/n plus Bluetooth 5 Core Specification, Internet of Things (IoT) network controller module. It is the ideal add-on to existing microcontroller (MCU) solutions, offering Wi-Fi® and Bluetooth® Low Energy (BLE) network capabilities through a SPI-to-Wi-Fi interface. The ATWINC3400 connects to any Microchip PIC® or SAM MCU with minimal resource requirements.  A MCU host driver can be found in the Advanced Software Framework (ASF). 

The ATWINC3400’s most advanced mode is a single-stream 1 x 1 802.11n mode. The ATWINC3400 features a fully integrated power amplifier, LNA, switch and power management. The ATWINC3400 also features an on-chip processor and integrated Flash memory for system software with built-in coexistence mechanism for concurrent Wi-Fi and BLE functionality. The only external clock source needed for the ATWINC3400 is a high-speed crystal or oscillator. The ATWINC3400 is available in a 36-pin module with dimensions of 22.4 x 14.7 mm.

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Firmware Release Summery
Latest released firmware version: v1.3.1, which is available in ASF 3.47 and later. 

Module part number with latest released firmware:
ATWINC3400-MR210CA131
ATWINC3400-MR210CA131-T (T for Tape and reel)

For product comparison, please consider: ATWINC1500, ATWILC1000, ATWILC3000

• IEEE 802.11 b/g/n 20MHz (1x1) Wi-Fi plus Bluetooth 5
• Network features: TCP, UDP, DHCP, ARP, HTTP, SSL, and DNS
• Superior Sensitivity and Range
• Security protocols supported: WPA/WPA2 Personal, WPA/WPA2 Enterprise, TLS, SSL
• Bluetooth 5 Certified
• Agency Certified in the US, Canada, Europe, Japan, Korea, China, India and Taiwan
• Single spatial stream in 2.4GHz ISM band
• Integrated PA and T/R Switch
• Superior Sensitivity and Range via advanced PHY signal processing
• Operating temperature range of -40C to +85C
• Integrated Network IP stack to minimize host CPU requirements
• On-Chip Network Stack to offload MCU
• Class 2 transmission and Adaptive Frequency Hopping
• Integrated PA and T/R Switch