Entry+ radar module integrates an A121 60 GHz pulsed coherent radar sensor with an Arm Cortex-M4 microcontroller for embedded sensing applications. The LGA module measures 18.6 mm by 15 mm and supports UART, I2C, GPIO, reset, and SWD/JTAG interfaces. It operates from 1.8 V analog and digital supplies with 1.8 V or 3.3 V I/O supply options over a -40 °C to 85 °C temperature range. The module meets RoHS and REACH requirements and is supplied for automated assembly in hermetically sealed reels.
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| Radar sensor | A121 |
| Radar technology | 60 GHz Pulsed Coherent Radar |
| Maximum range | 20m |
| MCU | STM32L431CBY6 |
| CPU core | 32-bit Arm Cortex-M4 |
| Clock speed | 80MHz |
| Flash memory | 128kB |
| RAM | 64kB |
| Module dimensions | 18.6 x 15mm |
| Analog and digital supply voltage | 1.71 to 1.89, 1.8 typicalV |
| VIN supply voltage, 3.3 V mode | 2.97 to 3.45, 3.3 typicalV |
| I/O interface supply | 1.8 or 3.3V |
| Operating temperature | -40 to 85°C |
| Serial interfaces | UART, I2C |
| Debug interfaces | SWD/JTAG |
| Moisture sensitivity level | MSL3 |
| RoHS | Compliant with Directive 2011/65/EC |
| REACH | Compliant with Regulation (EC) 1907/2006 |
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These are design resources that include the Acconeer AB XM125
Technical guide for the A121 Smart Presence Reference Application, featuring multi-zone detection, fast/slow motion analysis, and resource usage for the XM125 module.
User guide for the Acconeer A121 Sparse IQ Service, detailing API usage, sensor configuration, data retrieval, and memory management for pulsed coherent radar applications.
User guide for the Acconeer I2C Distance Detector application, detailing the register-based I2C interface for A121 radar sensors and XM125 modules.
Technical guide for integrating the Acconeer A121 radar sensor with host MCUs, covering hardware requirements, SPI communication, and Software Abstraction Layer (HAL) setup.
User guide for the Acconeer A121 radar sensor tank level application, covering liquid measurement from 3cm to 20m, presets, calibration, memory usage, and power consumption.
User guide for the Acconeer A121 Distance Detector, covering radar-based distance estimation algorithms, configuration, calibration procedures, and C API integration.
