Microchip Technology ATWILC1000B-UU-Y

Overview

ATWILC1000B-UU-Y from Microchip Technology is a single-chip IEEE 802.11b/g/n Wi-Fi link controller SoC with integrated PA, LNA, T/R switch, and power management. It delivers up to 72 Mbps PHY rate in 1×1 2.4 GHz ISM band operation, supports SPI and SDIO host interfaces, and operates from −40°C to +85°C with VDDIO 1.62–3.6 V and VBATT 3.0–4.2 V.

For engineers reviewing the ATWILC1000B-UU-Y datasheet, ATWILC1000B-UU-Y pinout, ATWILC1000B-UU-Y application, or ATWILC1000B-UU-Y equivalent, this page provides verified package mapping (3.24 × 3.24 mm WLCSP), confirmed 40-terminal pin assignment, real-world power states (<1 μA deep power-down), hardware-accelerated A-MSDU/A-MPDU aggregation, and Wi-Fi Direct®/Soft-AP support - all specific to the ATWILC1000B-UU-Y variant.

Technical Context

The ATWILC1000B-UU-Y integrates a Cortus APS3 32-bit processor managing MAC functions including association, authentication, security key handling, and MSDU aggregation/de-aggregation. Its WLAN subsystem implements OFDM channel estimation/equalization, advanced carrier/timing synchronization, and hardware-accelerated two-level frame aggregation with Block Acknowledgment.

It uses an external 26 MHz crystal (±100 ppm initial offset, 50–150 Ω ESR) for primary clocking and includes an internal 32 kHz ring oscillator (±10,000 ppm accuracy) for beacon monitoring sleep timing. Power architecture features integrated buck converter (VBATT_BUCK input, VSW switching output, VREG_BUCK core supply) and multi-rail domain separation (VDD_BATT_PA, VDD_RF_RX, VDD_AMS, VDD_SXDIG).

Key Specifications

Pinout & Package

ATWILC1000B-UU-Y is packaged in a 3.24 × 3.24 mm Wafer Level Chip Scale Package (WLCSP) with 40 solder balls. The package uses 0.35 mm pitch and 0.20 mm ball diameter, requiring fine-pitch PCB layout and reflow-compatible assembly.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ESP32-WROOM-32 and CYW43438, ATWILC1000B-UU-Y delivers lower system-level power (sub-μA deep sleep), smaller footprint (3.24 mm² WLCSP), and guaranteed hardware-accelerated security - making it optimal for space-constrained, battery-sensitive, and certification-driven designs where host offload is critical.

Availability

ATWILC1000B-UU-Y is available at Aetrix Electronics and suitable for smart home sensor nodes, industrial telemetry gateways, medical wearable monitors, and POS peripheral modules requiring stable component supply across production lifecycles.

Supply support for ATWILC1000B-UU-Y 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 is a U.S.-based semiconductor manufacturer specializing in microcontrollers, analog devices, and connectivity solutions with ISO 9001-certified global operations.

The ATWILC1000B product line targets ultra-low-power, cost-sensitive Wi-Fi IoT endpoints - delivering certified 802.11n connectivity with minimal external components and host processing burden.

FAQ

What is the package type and dimensions of ATWILC1000B-UU-Y?

ATWILC1000B-UU-Y uses a 3.24 × 3.24 mm Wafer Level Chip Scale Package (WLCSP) with 0.35 mm ball pitch and 0.20 mm ball diameter. This package is distinct from the QFN variant (ATWILC1000B-MU) and requires fine-pitch PCB layout and controlled reflow profiles. The WLCSP pinout matches the documented 40-ball assignment in Microchip's DS70005386C datasheet Figure 2-3.

Does ATWILC1000B-UU-Y include a MAC address, and how is it provisioned?

ATWILC1000B-UU-Y ships without a factory-programmed MAC address (as indicated by "No MAC ID" in ordering table). MAC address provisioning is performed via eFuse banks - specifically Bank 0 (default) or Banks 1–3 - using the 768-bit one-time-programmable memory. Each bank contains dedicated MAC Addr and Mac Addr Used bit fields; programming requires setting the Used bit to '1' to validate the address for firmware use.

What host interfaces does ATWILC1000B-UU-Y support, and how is selection handled?

ATWILC1000B-UU-Y supports both SDIO and SPI host interfaces, selected at power-up via the SDIO_SPI_CFG pin: tied to GND for SDIO mode, pulled to VDDIO (via 1 MΩ resistor) for SPI mode. The interface choice determines signal routing for SD_DATx/SD_CMD/SD_CLK (SDIO) or SPI_TXD/SPI_RXD/SPI_SCK/SPI_SSN (SPI), and affects driver stack requirements on the host side.

What are the power consumption characteristics of ATWILC1000B-UU-Y in low-power modes?

ATWILC1000B-UU-Y offers three defined low-power states: Deep Power-Down (<1 μA at 3.3 V I/O), Doze mode (380 μA with chip settings preserved for beacon monitoring), and active sleep using the on-chip 32 kHz oscillator. These values are measured per Microchip DS70005386C Section 8.4 and enable multi-year battery operation in intermittent transmission applications.

Is ATWILC1000B-UU-Y compatible with Wi-Fi Direct® and Soft-AP functionality?

Yes, ATWILC1000B-UU-Y supports Wi-Fi Direct® and Soft-AP functionality as confirmed in the official datasheet Features section. This capability is implemented in firmware and enables peer-to-peer communication and local access point operation without requiring external protocol stacks - allowing standalone device networking independent of infrastructure APs.