Apollo3 Blue Thin 01

Apollo3 Blue Thin MCU EVB

The Apollo3 Blue Thin MCU is an ultra-low power, ultra-low profile, highly integrated microcontroller platform based on the Ambiq® patented Subthreshold Power Optimized Technology (SPOT™) and designed for battery-powered and portable, mobile devices.

Apollo3 Blue Thin MCU EVB Drawing
Apollo3 Blue Thin MCU EVB

Block Diagram for the Ultra-Low Power Apollo3 Blue Thin MCU

More Information

The Apollo3 Blue Thin MCU sets a new standard in energy efficiency for battery powered devices with an integrated Arm® Cortex®-M4 processor with Floating Point Unit and TurboSPOT™ increasing the computational capabilities of the Arm Cortex-M4F core to 96 MHz while lowering the active power consumption to 6 μA/MHz. This combination dramatically reduces energy consumption while still enabling abundant application processing power to add greater capability and extended life to battery operated devices. The Apollo3 Blue Thin brings several new features to Ambiq’s SPOT-based Apollo MCU Family including an integrated DMA engine, QSPI interface, and advanced stepper motor control for ultra-low power analog watch hand management.
With unprecedented energy efficiency and PDM microphone inputs, the Apollo3 Blue Thin also forms the core of Ambiq’s Voice-on-SPOT™ reference platform making it the perfect device for customers who want to add always-on voice assistant integration and command recognition to battery-powered devices. To increase design flexibility and enable connections to the phone and cloud, the Apollo3 Blue Thin provides a dedicated second core for the ultra-low power Bluetooth Low Energy 5 connectivity platform providing superior RF throughput and leaving plenty of resources available for user applications.

Ultra Thin with Backside Coating

As thin as 300 μm and perfect for contactless biometric cards, including payment, authentication, access, and more.

Ideal Solution

An ideal solution for battery-powered applications requiring sensor measurement and data analysis.

Integrated Bluetooth Low Energy 5 Radio

Serves as an applications processor for one or more sensors and has a fully integrated Bluetooth Low Energy 5 radio.

Multiple Serial Protocol Support

A host processor can communicate with the Apollo3 Blue Thin MCU over its serial slave port using the I2C, SPI or I2S protocol.

High Energy Efficiency

TurboSPOT technology allows applications to meet critical timing as/when needed while still providing extremely high energy efficiency operation.

Extended Battery Life

Enables months and years of battery life for products only achieving days or months of battery life today.

Greater Performance

Implementation of the Cortex-M4F core delivers both greater performance and much lower power than 8-bit, 16-bit, and other comparable 32-bit cores.

Optimized PWM

Supports highly optimized PWM pattern generation for complex, efficient stepper motor control operation.

Software Tool Suite

Supported by a complete suite of standard software development tools.


Ultra-Low Supply Current

6 μA/MHz executing from flash or RAM at 3.3 V

1 μA deep sleep mode (Bluetooth Low Energy Off) with RTC at 3.3 V (Bluetooth Low Energy in SD)

High-Performance Arm Cortex-M4 Processor

Up to 48 MHz nominal clock frequency with 96 MHz performance TurboSPOT Mode

Floating Point Unit (FPU)

Memory Protection Unit (MPU)

Wake-up interrupt controller with 32 interrupts




Integrated Bluetooth Low Energy Module

RF sensitivity: -94 dBm (typical)

Ultra-Low Power Memory

Up to 1MB of flash memory for code/data

Up to 384KB of low power RAM for code/data

16KB 2-way Associative/Direct-Mapped Cache

Ultra-Low Power Interface for On- and Off-Chip Sensors

14-bit ADC, 15 selectable input channels available

Up to 2.67 MS/s sampling rate

Voltage Comparator (VCOMP)

Temperature sensor with ±3°C accuracy after calibration

Ultra-Low Power Flexible Serial Peripherals

ISO7816 Secure interface

1x 2/4/8-bit SPI master interface (MSPI)

6x I2C/SPI masters for peripheral communication

1x I2C/SPI slave for host communications

2x UART modules with 32-location Tx and Rx FIFOs

PDM for mono and stereo audio microphones

1x 12S slave for PDM audio pass-through

Rich Set of Clock Sources

32.768 kHz Crystal (XTAL) oscillator

Low Frequency RC (LFRC) oscillator (1.024 kHz)

High Frequency RC (HFRC) oscillator (48 MHz)

RTC based on Ambiq’s AM08X5/18X5 family

Wide Operating Range

1.755-3.63 V, -40°C to 85°C


Voice-on-SPOT compatible for always-listening keyword detect, audio command recognition and voice assistant integration in battery-powered devices including:
- Bluetooth® headsets, earbuds, and truly wireless earbuds
- Remote and Gaming Controls
- Smart home

Wearables including smart watches and fitness/activity trackers

Hearing aids, Digital Health Monitoring and Sensing Devices

Smart Home Automation, Security and Lighting control applications

Package Option

3.25 mm x 3.37 mm, 66-pin WLCSP 300 μm with backside coating

Ordering Information

AMA3B1KK-KCR-TB (384KB, 66-pin WLCSP)

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