The Ambiq harvestKIT AMA3BHARV1 is a versatile energy harvesting reference design platform designed to enhance battery life or eliminate the need for batteries in IoT applications. At its core is the Apollo3 Blue SoC, which utilizes the Ambiq patented Subthreshold Power Optimized Technology (SPOT®) to deliver high energy efficiency and processing power for devices running on small batteries or other more environmentally friendly energy storage elements, such as supercapacitors.
harvestKIT features the Ambiq AM1805 Artasie real-time clock (RTC) to maintain accurate time and date. The RTC gates power to the MCU replacing its deep-sleep power consumption with much lower RTC current (as low as 14 nA) + external FET leakage. The RTC 256 MB RAM is available to save the MCU firmware state or backup the last sensor data. This RAM is backed up by a tiny, environmentally friendly solid-state battery.
The kit supports a wide range of modules through its mikroBUS™ sockets, allowing for easy expansion and customization. Included in the kit is a click module based on the Nexperia NEH2000BY PMIC IC for solar energy harvesting, and two low-power 1.8 V custom click sensor modules from TDK InvenSense and Bosch Sensortec for motion and environmental monitoring. The Apollo3 Blue SoC efficiently reads data from these sensors. Significant compute cycles and on-chip memory capacity are available to run AI/ML algorithms that process the sensor data on the edge as an endpoint and relay only the results to the host via the integrated Bluetooth® Low Energy (BLE) 5 radio, further reducing power consumption. The Ambiq reference firmware sends raw sensor data at user-selected intervals to a web app running in a Chromium web browser on a PC, phone, or tablet. Reference source code is available for the SoC firmware and host GUI web app.
The board includes a 10-pin (1.27 mm pitch) Arm® Cortex® JTAG/SWD debug connector compatible with Segger J-Link debuggers.
Features
- Apollo3 Blue SOC
- Cortex-M4F at 96 MHz
- 1 MB Flash, 384 KB SRAM
- Secure boot, secure upgrade (OTA)
- Bluetooth LE 5 integrated radio
- 8 mm x 8 mm, 64-pin QFN with 38 GPIO
- AM1805 Artasie RTC
- RTC companion for external MCU
- Time/date accuracy as low as 2 ppm using 32 kHz crystal
- On-chip RC option drops current as low as 14 nA
- FET power switch control eliminates MCU deep sleep current
- 256 MB RAM saves MCU state and/or last sensor data (backed up by solid-state battery)
- 3 mm x 3 mm, 16-pin QFN with 4 GPIO
- 2 pc 1.8 V/3.3 V microBUS click module sockets
- 1 pc TDK ICM-45605 ultra high-performance 6‑axis MEMS motion sensor
- 1 pc Bosch BME688 4-in-1 environmental sensor (pressure, humidity, temperature, and gas scanning)
- 2 pc energy harvesting microBus sockets with 2-pin power + GND input header
- 1 pc Nexperia NEH2000BY energy harvesting PMIC click module with Panasonic solar cell
- One available expansion socket for a 2nd harvesting PMIC or any other click module
- Energy storage
- Eaton HSL1225 120 farad hybrid super-cap (charged by harvesting sockets M4 and M3, or optionally via USB-C® connector)
- ITEN ITXQFN15A 150 µAh 2.5 V solid state battery (charged by RTC, used for RTC RAM backup)
- Timing components
- SiTime SiT11100 ultra-small 0505 size 32 MHz MEMS resonator, 0.46 x 0.46 CSP (for MCU BLE radio)
- Epson FC1610BN small size, low ESR 32.768 kHz crystal, 1. 6 mm x 1.0 mm (for RTC and MCU)
Applications
- Building automation/access controls/smart homes
- Remote monitoring: Bridge/highway/rail health, geology, weather stations, and more
- Remote controls/video game controllers
- Wearable smart bands
- Asset trackers: Cargo/luggage/pets
- Factory automation/conditional monitoring/predictive maintenance
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The Ambiq harvestKIT AMA3BHARV1 is a versatile energy harvesting reference design platform designed to enhance battery life or eliminate the need for batteries in IoT applications. At its core is the Apollo3 Blue SoC, which utilizes the Ambiq patented Subthreshold Power Optimized Technology (SPOT®) to deliver high energy efficiency and processing power for devices running on small batteries or other more environmentally friendly energy storage elements, such as supercapacitors.
