Apollo2 01

Apollo2 MCU EVB

The Apollo2 MCU is an ultra-low power, highly integrated microcontroller designed for battery-powered and portable, mobile devices. At the heart of the Apollo2 MCU is Ambiq’s patented Subthreshold Power Optimized Technology (SPOTTM) and a powerful Arm® Cortex®-M4 processor with Floating Point Unit.

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Apollo2 MCU EVB Drawing
Apollo2 MCU EVB

Block Diagram for the Ultra-Low Power Apollo2 MCU

Block Diagram for Apollo2 MCU
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This combination dramatically reduces energy consumption while still enabling abundant application processing power to add greater capability and extended life to battery-operated devices. With unprecedented levels of energy efficiency, the Apollo2 can deliver always-on keyword detection and voice assistant integration, local voice control, complex sensor processing, gesture recognition and activity monitoring applications within the smallest power budget.
The Apollo2 MCU is the 2nd generation controller building upon Ambiq’s Apollo MCU product line. The Apollo2 MCU integrates up to 1MB of flash memory and 256KB of RAM to accommodate radio and sensor overhead while still leaving plenty of space for application code and algorithms. In addition to flexible serial channels for radio and sensor communication, this microcontroller also includes dual Pulse-Density Modulation (PDM) inputs for applications that require digital microphones for near and mid-field always-on keyword detection, voice assistant integration, and voice control.

Features Highlights 02

Ideal Solution

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

ADC with Analog and Digital Outputs

Can measure analog sensor outputs using an integrated ultra-low power 14-bit ADC and digital sensor outputs using the integrated serial master ports.

Multiple Serial Protocol Support

A host processor can communicate with the Apollo2 MCU over its serial slave port using the I2C, SPI or I2S protocol.

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.

Uniquely Tuned ADC

ADC is uniquely tuned for minimum power with a configurable measurement mode that does not require MCU intervention.

Software Tool Suite

Supported by a complete suite of standard software development tools.


Specifications 03

Ultra-Low Supply Current

< 10 μA/MHz executing from flash at 3.3 V

< 10 μA/MHz executing from RAM at 3.3 V

< 3 μA deep sleep mode with RTC at 3.3 V

High-Performance Arm Cortex-M4 Processor

Up to 48 MHz clock frequency

Floating Point Unit (FPU)

Memory Protection Unit (MPU)

Wake-up interrupt controller with 32 interrupts










Ultra-Low Power Memory

Up to 1MB of flash memory for code/data

Up to 256KB of low power RAM for code/data

16KB 2-way Associative 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

6x I2C/SPI masters with 128-byte bidirectional FIFO for communication with sensors, radios, and other peripherals

1x I2C/SPI slave for host communications with 256-bytes LRAM area for FIFO/host support

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


Headsets, Earphones, Wireless Earbuds

Mobile Accessories

Hearing Aids

Always-Listening, Voice-Activated Appliances

Portable Voice Assistants

Remote Controls

Smart Cards

Fingerprint Readers

Wearable electronics including smart watches

Smart meters

Wireless sensors

Activity and fitness monitors

Consumer electronics

Package Options

4.5 mm x 4.5 mm 64-pin BGA with 50 GPIO

2.5 mm x 2.5 mm 49-pin WLCSP with 34 GPIO

Ordering Information

AMAPH1KK-KBR (256KB RAM, 64-pin BGA)



Typical Sensor Application Circuit for the Apollo2 MCU
Typical Sensor Application Circuit for the Apollo2 MCU
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Documents 04

Where To Buy 05


Fujitsu Electronics Pacific Asia Limited Singapore Branch

[email protected]

Southeast Asia


[email protected]

Fujitsu Electronics Pacific Asia Limited Singapore Branch

[email protected]

China and Hong Kong

Direct Sales

[email protected]


Fujitsu Electronics Inc (FEI)

[email protected]


[email protected]


Direct Sales

[email protected]

TOP-electronics USA

[email protected]


Direct Sales

[email protected]


Direct Sales

[email protected]

Sechang Semicon Co., Ltd. – Sales Representative

[email protected]