The **Ambiq Apollo2 Blue** is an ultra-low power microcontroller (MCU) featuring an integrated Bluetooth Low Energy (BLE) radio. It is specifically designed for battery-powered wearable devices, IoT sensors, and smart home products where power consumption is the most critical factor. --- ## 1. Core Architecture & CPU The Apollo2 Blue is built on the proprietary **SPOT™ (Subthreshold Power Optimized Technology)** platform, which allows transistors to operate at voltage levels below the standard threshold. | Feature | Specification | | :--- | :--- | | **Core** | 32-bit ARM® Cortex®-M4F | | **Clock Speed** | Up to 48 MHz | | **FPU** | Integrated Floating Point Unit | | **Process Tech** | 40nm with SPOT™ Technology | --- ## 2. Memory Configuration The chip provides sufficient memory for complex BLE stacks and user applications while maintaining a small physical footprint. * **Flash Memory:** 1 MB (Non-volatile storage for firmware). * **SRAM:** 256 KB (For data handling and BLE stack operations). * **Cache:** 16 KB 2-way associative cache to reduce power-hungry flash accesses. --- ## 3. The Bluetooth Low Energy (BLE) Radio The "Blue" suffix indicates the inclusion of a dedicated BLE connectivity module. * **Standard:** Bluetooth 4.2 Low Energy. * **Integration:** The radio is integrated on-chip, reducing the need for external wireless components. * **Features:** * Support for up to 8 simultaneous connections. * Low-power receive (RX) and transmit (TX) currents. * Integrated RF matching circuit (simplifies PCB design). --- ## 4. Power Management & Efficiency Power efficiency is the standout electronic feature of the Apollo2 Blue. | Operating Mode | Power Consumption | | :--- | :--- | | **Active Mode** | ~10 µA / MHz (Executing from Flash) | | **Deep Sleep** | < 2 µA (With RTC and RAM retention) | | **Voltage Supply** | 1.8V to 3.6V | ### Key Power Electronics: * **Buck Converters:** High-efficiency integrated DC-DC converters manage internal voltage rails. * **Sleep Modes:** Multiple granular sleep modes allow the MCU to shut down unused peripherals. --- ## 5. Peripherals and Connectivity Despite its low power, it offers a robust set of interfaces for external electronic components. * **I/O Interfaces:** * 6x I2C/SPI Master controllers. * 1x I2C/SPI Slave controller. * 2x UARTs. * **Analog-to-Digital:** 14-bit, 15-channel ADC (up to 800 kSPS). * **Timers:** 8x 16-bit timers and a dedicated Real-Time Clock (RTC). --- ## 6. Physical Packaging The chip is designed for miniaturization in electronics. ```text Package Options: - 64-pin BGA (4.5 mm x 4.5 mm) - 49-pin WLCSP (3.25 mm x 3.25 mm) ```