Microchip Technology ATBTLC1000A-UU-T

Overview

ATBTLC1000A-UU-T from Microchip Technology (formerly Atmel) is an ultra-low-power Bluetooth Low Energy 4.1 System-on-Chip integrating ARM Cortex-M0 MCU, 2.4GHz transceiver, BLE protocol stack in ROM, hardware AES-128/SHA-256 accelerators, and fully integrated buck DC/DC converter. It operates from 1.8–4.3V, achieves -95dBm RX sensitivity, and delivers 3.0mA peak TX current at 0dBm - enabling compact wearable health monitors with multi-day battery life.

For engineers reviewing the ATBTLC1000A-UU-T datasheet, ATBTLC1000A-UU-T pinout, ATBTLC1000A-UU-T application, or ATBTLC1000A-UU-T equivalent, this page provides verified technical context, validated pin functions, confirmed low-power operating states, real-world BLE profile support (Heart Rate, Proximity), and accurate package-level design constraints for WLCSP layout and power sequencing.

Technical Context

The ATBTLC1000A-UU-T implements a dual-clock architecture: a 26MHz crystal oscillator for BLE timing compliance and ARM core operation, plus a 32.768kHz RTC XO for precise connection-event wakeup - reducing average advertising current to 9.7µA. Its BLE subsystem includes integrated PA, TR switch, and single-wire antenna interface, while the PMU integrates a buck converter requiring only two external inductors (4.7µH, 9.1nH) and one capacitor (4.7µF).

Hardware security is enforced via dedicated AES-128 and SHA-256 accelerators offloading encryption from the Cortex-M0; memory includes 128kB ROM (for certified BLE stack) and 128kB RAM (96kB user-accessible). The device supports three operational power domains: always-on GPIOs (e.g., AO_GPIO_0), switchable I/O (VDDIO_SWITCH), and RF/analog supplies (VDD_RF, VDD_AMS) with independent LDO regulation.

Key Specifications

Pinout & Package

The ATBTLC1000A-UU-T is housed in a 31-ball Wafer-Level Chip-Scale Package (WLCSP) measuring 2.262 × 2.142 mm with 0.35mm pitch and 0.2mm ball diameter. Package is RoHS/green compliant and requires no underfill for standard reflow profiles.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar BLE SoC applications.

Compared with Nordic nRF52810-QFAA and TI CC2640R2F, the ATBTLC1000A-UU-T offers lowest system-level BOM count due to integrated buck converter and ROM-based certified stack, making it optimal for cost-sensitive, ultra-low-power BLE peripherals where BLE 4.1 suffices and rapid time-to-certification is critical.

Availability

ATBTLC1000A-UU-T is available at Aetrix Electronics and suitable for wearable health monitors, smart home sensors, industrial asset trackers, wireless medical thermometers, and BLE beacon deployments requiring stable component supply across high-mix, low-volume production runs.

Supply support for ATBTLC1000A-UU-T 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 acquired Atmel in 2016 and maintains full support for legacy Atmel wireless products including the ATBTLC1000 family.

The ATBTLC1000 product line was designed specifically for ultra-low-power, small-form-factor BLE 4.1 applications where integrated power management, certified protocol stack, and minimal external components are mandatory - targeting wearables, medical sensors, and battery-operated IoT edge nodes.

FAQ

What is the minimum external component count required to operate ATBTLC1000A-UU-T as a standalone BLE device?

The ATBTLC1000A-UU-T requires only three external passive components for full operation: two inductors (4.7µH and 9.1nH) and one capacitor (4.7µF) for the integrated buck DC/DC converter. No external crystal load capacitors are needed for CL=8pF 26MHz crystals due to programmable on-chip capacitance (1.0–9.75pF). A 32.768kHz crystal is optional but recommended for BLE connection-event timing precision.

Does ATBTLC1000A-UU-T support over-the-air (OTA) firmware updates?

Yes, ATBTLC1000A-UU-T supports OTA firmware updates via its embedded BLE stack. The device implements the BLE Secure Connections Pairing and Device Firmware Update (DFU) service profiles. Application firmware stored in external SPI flash can be updated through authenticated GATT writes, leveraging the on-chip AES-128 engine for encrypted transfer integrity verification.

Can ATBTLC1000A-UU-T operate without an external 26MHz crystal?

Yes, ATBTLC1000A-UU-T can operate using its internal 26MHz RC oscillator for non-BLE MCU tasks, but BLE radio operation mandates the 26MHz crystal oscillator for timing compliance. The RC oscillator exhibits ±50% frequency variation over voltage, temperature, and process - insufficient for BLE packet timing. The crystal is required for any BLE advertising, scanning, or connection activity.

What is the function of the VDDIO_SWITCH pin on ATBTLC1000A-UU-T?

VDDIO_SWITCH is a digitally controlled power switch that enables or disables the I/O supply to external SPI flash memory. When asserted, it powers the flash VCC rail; when de-asserted, it isolates the flash to prevent leakage during deep sleep. This pin is essential for achieving the 1.1µA ultra-low-power state with 8KB RAM retention, as it eliminates standby current draw from unpowered peripherals.

How does the ATBTLC1000A-UU-T handle Brown-Out Detection and Power-On Reset?

ATBTLC1000A-UU-T integrates a dedicated Brown-Out Detector (BOD) with programmable threshold (1.73–1.92V typical) and a Power-On Reset (POR) circuit. The BOD monitors the bandgap reference voltage and asserts reset if supply drops below threshold; POR holds the chip in reset for ~8.2ms after VBATT_BUCK rises above 1.2V. Both functions are hardware-enforced and require no firmware initialization.