Microchip Technology ATWINC1500B-MU-T042

Overview

ATWINC1500B-MU-T042 from Microchip Technology is a fully integrated IEEE 802.11b/g/n Wi-Fi SoC with on-chip Cortus APS3 32-bit processor, 4 Mb Flash, and hardware-accelerated TLS/TCP/IP stack. It delivers up to 72 Mbps PHY rate in 2.4 GHz ISM band, supports Soft-AP mode, and operates from -40°C to +85°C with 2.7–3.6 V I/O voltage. It interfaces via SPI and requires only a 26 MHz crystal oscillator.

For engineers reviewing the ATWINC1500B-MU-T042 datasheet, ATWINC1500B-MU-T042 pinout, ATWINC1500B-MU-T042 application, or ATWINC1500B-MU-T042 equivalent, key selection criteria include integrated flash size (4 Mb), MAC ID assignment status, tape-and-reel packaging, power-down current (<4 µA), and SPI host interface compatibility with resource-constrained MCUs.

Technical Context

The ATWINC1500B-MU-T042 integrates RF transceiver, baseband, MAC, and network stack into a single QFN package. Its WLAN subsystem uses dedicated datapath engines for FCS checking and AES-CCMP encryption, hardwired logic for EDCA/QoS timing and block ACK control, and firmware-executed functions for association management and beacon processing.

It implements a dual-power architecture: VBATT (3.0–4.2 V) powers the DC/DC converter and PA stages, while VDDIO (2.7–3.6 V) supplies digital I/Os. The chip includes an on-chip 32 kHz low-power oscillator and supports external RTC clock input on GPIO1/RTC_CLK, though current firmware does not require it.

Key Specifications

Pinout & Package

The ATWINC1500B-MU-T042 is housed in a 40-pin QFN package (5 mm × 5 mm, 0.4 mm pitch) with exposed thermal paddle connected to system ground. Pin functions are validated per Microchip DS70005374B, pages 6–8.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar Wi-Fi SoC applications.

Compared with ATWINC1510B-MU-T042, ATWINC1500B-MU-T042 offers identical RF performance and power modes but halves Flash capacity-sufficient for certified WPA2/WPA3 stacks and lightweight HTTP clients. Versus ESP32-WROOM-32, it trades dual-radio flexibility for guaranteed hardware-accelerated TLS and zero-host-network-stack design, reducing BOM count and certification effort.

Availability

ATWINC1500B-MU-T042 is available at Aetrix Electronics and suitable for smart home sensor hubs, industrial wireless gateways, medical wearables, asset tracking beacons, and battery-powered IoT endpoints requiring stable component supply and long-term lifecycle support.

Supply support for ATWINC1500B-MU-T042 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Microchip Technology Inc. is a U.S.-based semiconductor manufacturer specializing in microcontrollers, analog devices, and connectivity solutions for industrial, automotive, and IoT markets.

The ATWINC15x0B product line was designed as a certified, low-power Wi-Fi SoC family targeting resource-constrained embedded systems needing secure, standards-compliant wireless connectivity with minimal host MCU involvement.

FAQ

What distinguishes ATWINC1500B-MU-T042 from other variants in the ATWINC15x0B family?

The ATWINC1500B-MU-T042 is a specific ordering variant of the ATWINC1500B with 4 Mb Flash, pre-programmed MAC address (indicated by "042" suffix), and shipped in tape-and-reel packaging. It shares identical RF performance, power characteristics, and pinout with ATWINC1500B-MU-Y042 (tray-packaged) and ATWINC1500B-MU-T (no MAC ID), but differs from ATWINC1510B-MU-T042 which contains 8 Mb Flash.

Does ATWINC1500B-MU-T042 support WPA3 or only WPA2 security protocols?

The ATWINC1500B-MU-T042 supports WPA2 (802.11i) with AES-CCMP and TKIP out-of-the-box. WPA3 support requires firmware version 19.7.1 or later and is enabled via OTA update; the hardware includes all necessary cryptographic accelerators (AES, SHA-256, ECC) to execute WPA3-SAE handshake and encryption without host intervention.

Can ATWINC1500B-MU-T042 operate without an external 26 MHz crystal?

No - the ATWINC1500B-MU-T042 requires an external 26 MHz crystal connected to XO_P and XO_N pins. The internal oscillator lacks the stability needed for 802.11 timing compliance. While the datasheet mentions bypass capability for an external 26 MHz clock signal, this still requires a precision AC-coupled source meeting jitter (<1 psec RMS) and phase noise (-130 dBc/Hz @ 10 kHz) specs - not a generic MCU clock output.

Is the SPI interface of ATWINC1500B-MU-T042 compatible with standard 3.3 V logic levels?

Yes - ATWINC1500B-MU-T042 operates with VDDIO between 2.7 V and 3.6 V, making it directly compatible with standard 3.3 V SPI peripherals. All digital I/O pins (SPI_SSN, SPI_SCK, SPI_TXD, SPI_RXD, GPIO2/IRQN) are 3.3 V tolerant and do not require level shifters when interfaced with common ARM Cortex-M or PIC MCU families.

How is the MAC address stored and managed in ATWINC1500B-MU-T042?

The ATWINC1500B-MU-T042 has its MAC address pre-programmed into Bank 1 of the 768-bit eFuse memory during manufacturing - confirmed by the "042" suffix indicating assigned MAC ID. The firmware reads this value at boot and uses it for 802.11 association. Customers may program alternate MAC addresses into unused eFuse banks (e.g., Bank 2 or 3) for field reconfiguration, provided the original bank is invalidated first.