Apollo4 Blue 01

Apollo3 Blue Plus EVB

Ambiq, the leader in low-power System-on-Chip (SoC) design, has once again raised the bar with the Apollo4 Blue SoC. With the lowest dynamic and sleep mode power on the market, the Apollo4 Blue SoC allows designers of next-generation wearables and smart devices to take their innovative products to the next level. General availability will begin in Q3, 2021.

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Apollo3 Blue Plus EVB Drawing
Apollo3 Blue Plus EVB

Block Diagram for the Ultra-Low Power Apollo4 Blue SoC

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The Apollo4 Blue SoC family is the 4th generation system processor solution built upon Ambiq’s proprietary Subthreshold Power-Optimized Technology (SPOT™) platform. The Apollo4’s complete hardware and software solution enables the battery-powered endpoint devices of tomorrow to achieve a higher level of intelligence without sacrificing battery life. The Apollo4 Blue with its 32-bit Arm® Cortex®-M4 core with Floating Point Unit (FPU) is implemented on the TSMC® 22nm ULL process. General availability will begin in Q3, 2021.
With up to 2MB of MRAM and 1.8MB of SRAM, the Apollo4 Blue has more than enough compute and storage to handle complex algorithms and neural networks while displaying vibrant, crystal-clear, and smooth graphics. If additional memory is required, an external memory is supported through Ambiq’s multi-bit SPI and eMMC interfaces.

The Apollo4 Blue is purpose-built to serve as both an application processor and a coprocessor for battery-powered endpoint devices, including smartwatches, children’s watches, fitness bands, animal trackers, far-field voice remotes, predictive health and maintenance, and the smart home.

Low Power Sleep Mode with RTC

Achieving an unmatched 4 μA/MHz executing from SRAM or MRAM with cache, and 1.5 μA sleep mode with RTC1.

1Assumes ideal DC-DC stepdown from 3.3V to 1.8V.


Up to 192 MHz clock frequency with TurboSPOTTM.

2D/2.5D Graphics Accelerator

2D/2.5D graphics accelerator and MIPI DSI 1.2 with up to two lanes at 500Mbps per lane delivering a feature-rich user interface.

Bluetooth Low Energy 5

Apollo4 Blue MCU is embedded with Bluetooth Low Energy 5 radio including Angle of Arrival (AOA) and Angle of Departure (AOD) for always-on applications.

Proprietary Audio Interface

Proprietary audio interfaces and an ultra-low power analog microphone ADC for truly always-on voice processing.

Integrated Audio Subsystem

Serves as an applications processor with a fully integrated audio subsystem and interface to BT/BLE 5/WiFi radios.

Digital and Analog Peripheral Interfaces

Includes an extensive set of digital and analog peripheral interfaces with integrated ADCs and digital sensor processing using the integrated serial master ports.

Ultra-Low Power ADC

8 PDM channels, 2 stereo I2S channels with ASRC, and an ultra-low power ADC for analog mics.

TSMC 22nm ULL Process

Microcontroller implemented with TSMC 22nm ULL process and Arm Artisan Physical IP.


Ultra-Low Supply Current

4 μA/MHz executing from MRAM (with cache)

4 μA/MHz executing from SRAM

Low power sleep mode with RTC and 8KB SRAM retention

High-Performance Arm Cortex-M4 Processor with FPU

Up to 192 MHz clock frequency

Floating Point Unit (FPU)

Memory Protection Unit (MPU)

Secure Boot



Bluetooth Low Energy 5

2 Mbps, extended advertising packets


Tx: 3.5 mA @ 0 dBm, Rx: 3.5 mA

Tx: -20 dBm to +10 dBm output power

Rx Sensitivity: -97 dBm at 1 Mbps, -94 dBm at 2 Mbps

Ultra-Low Power Memory

Up to 2MB of non-volatile MRAM for code/data

Up to 1.8MB of low power SRAM for code/data

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

12-bit ADC, 11 selectable input channels

Up to 2.8 MS/s sampling rate

Temperature sensor with ±3°C accuracy

Ultra-Low Power Flexible Serial Peripherals

3x 2/4/8-bit SPI master interfaces

7x I2C/SPI masters for peripheral communication

1x SPI slave for host communications

4x UART modules with flow control

1x USB 2.0 HS/FS device controller

1x SDIO (SD3.0)/1x eMMC (v4.51)


MIPI DSI 1.2 with 2 data lanes up to 500 Mbps

Up to 640 x 480 resolution

4 layers with alpha blending

Frame Buffer Decompression


2D/2.5D graphics accelerator

Full Alpha Blending

Texture and Frame Buffer Compression

Audio Processing

1x stereo Low Power Analog microphones

4x stereo Digital microphones

2x full-duplex I2S ports with ASRC

Rich Set of Clock Sources

16-52 MHz and 32.768 kHz Crystal (XTAL) oscillators

1 kHz Low Frequency RC (LFRC) oscillator

2x High Frequency RC (HFRC) oscillator – 192/384 MHz

Power Management

Operating range: 1.71-2.2 V, –40°C to 85°C

SIMO buck

Multiple I/O voltages supported


Smart watches/bands

Wireless sensors and IoT

Activity and fitness monitors

Children's watches

Animal trackers

Motion and tracking devices

Alarms and security system

Far-field voice remotes

Consumer medical devices

Predictive maintenance

Smart home

Package Options

4.7 mm x 4.7 mm, 131-pin SIP BGA

Ordering Information


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