16 Document Revision History

The document revision history describes the changes that were implemented in the document. The changes are listed by revision, starting with the most current publication


Revision	Date	Section	Changes
E	05/2025	Features	Added compatibility for Wi-Fi® 6/7 Access Points/Routers at 2.4 GHz Updated Superior MAC throughput Wi-Fi features
		Package Outline Drawings	Updated package outline drawings
		Digital I/O Pin Behavior During Power-Up Sequences	Editorial changes
		Memory Subsystem	Editorial changes
		MAC	Removed HCCA in the introduction section Removed HCCA, PCF, Traffic Scheduling Removed transmission feature in Advanced IEEE 802.11n
		WLAN Subsystem	Editorial changes
		Appendix A: Regulatory Approval	Updated the section.
D	04/2021	Document	Replaced Master/Slave with the new terminologies. For more details, see the following note.
		Ordering Information and Module Marking	Updated Figure 1-1 with tape and reel information.
		Europe	Updated EN 301 489 in EMC to EN 301 489-1 and EN 301 489-17.
C	12/2020	Document	Updated ATWINC3400-MR210CA to ATWINC3400-MR210xA Added ATWINC3400-MR210UA module information Minor edits
		Block Diagram	Updated Figure 2-1
		Pinout and Package Information	Updated Figure 3-1 Updated pin descriptions of Pin 8, 9, 14, 15, 22,27, 28,29, 30, 31, 32 and 37 Added Note
		Electrical Characteristics	Updated VBAT specification in Recommended Operating Conditions
		WLAN Subsystem	Added footnotes for Short GI feature
		SPI Timing	Updated Note Added description in I²C Client Interface
		ATWINC3400-MR210CA Module Placement and Routing Guidelines	Added ATWINC3400-MR210CA for the section name Updated Figure 13-2
		ATWINC3400-MR210UA Module Placement and Routing Guidelines	Added
		ATWINC3400-MR210UA Approved External Antennas	Added
		Ordering Information and Module Marking	Updated Table 1-1 Updated Figure 1-1
		UART Interface	Updated with Wi-Fi and Bluetooth® Low Energy data information
		Host Interface	Updated Figure 11-1
		Appendix A: Regulatory Approval	Updated Japan, Korea, Taiwan and China regulatory IDs for ATWINC3400-MR210CA Updated USA, Canada and Europe regulatory IDs for ATWINC3400-MR210UA Added Gain Table for Individual Regulatory Region Updated United States, Canada and Europe with the details of antennas used for approval Revamped Europe Updated module label information in Korea Updated expiry date information in China Updated contents of Other Regulatory Information
B	08/2018	Document	Updated from Bluetooth 4.0 to Bluetooth 5.0 throughout the document
		Features	Removed Bluetooth Host and Controller QD ID Added QD ID for an end product
		Ordering Information and Module Marking	Updated product web page link
		Table 10-1 and Table 10-2	Updated pin numbers
		Reflow profile information	Removed Reflow Profile information sections Added link to Solder Reflow Recommendation Application Note
		Appendix A: Regulatory Approval	Added PMN details under Canada/ISED
		Reference Documentation	Updated web links Added Solder Reflow Recommendation
		Radiation Pattern	Newly added
A	11/2017	Document	Initial Release

Note: Microchip is aware that some terminologies used in the technical documents and existing software codes of this product are outdated and unsuitable. This document may use these new terminologies, which may or may not reflect on the source codes, software GUIs, and the documents referenced within this document. The following table shows the relevant terminology changes made in this document.

Table 16-1. Terminology Related Changes
Old Terminology	New Terminology	Description
Master	Host	The following sections are updated with new terminology: Pinout and Package Information Interfacing with the Host Microcontroller SPI Client Interface Overview SPI Timing I²C Client Interface
Slave	Client