The Entry+ radar module integrates an A121 60 GHz pulsed coherent radar sensor with a 32-bit Arm Cortex-M4 microcontroller in an 18.6 mm by 15 mm LGA form factor. The module supports presence detection, motion detection, parking-space occupancy detection, and level measurement with communication over UART and I2C register-command interfaces. It operates from a 1.8 V analog and digital supply with 1.8 V or 3.3 V interface supply options over a -40 °C to 85 °C temperature range. The module includes integrated baseband, RF front-end, and antenna-in-package technology and supports SWD/JTAG programming and debugging.
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| Radar sensor | A121 60 GHz Pulsed Coherent Radar |
| Radar frequency | 60GHz |
| MCU core | 32-bit Arm Cortex-M4 |
| MCU part number | STM32L431CBY6 |
| MCU 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 typV |
| VIN operating voltage at 1.8 V mode | 1.71 to 1.89, 1.8 typV |
| VIN operating voltage at 3.3 V mode | 2.97 to 3.45, 3.3 typV |
| I/O operating range | 0 to VIN+0.3V |
| Operating temperature | -40 to 85°C |
| External interfaces | UART, I2C, GPIO, reset |
| Debug interfaces | SWD/JTAG |
| Package type | Land Grid Array solder pads |
| Idle current, hibernate | 17.7 typµA |
| Idle current, off | 6.90 typµA |
| Moisture sensitivity level | MSL3 |
| Maximum recommended reflow passes | 1 |
| RoHS | Meets Directive 2011/65/EC |
| REACH | Meets Regulation (EC) 1907/2006 |
| Red | Compliant with Radio Equipment Directive 2014/53/EU article 3.2 |
| Fcc | Compliant with 47 CFR part 15 unintentional emitter Class B |
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These are design resources that include the Acconeer XM125
A guide for developing software on the Acconeer XM125 module, covering SDK installation, flashing via UART, and environment setup using STM32CubeIDE or command line tools.
Guide for Acconeer A121 presence detection. Covers intra-frame and inter-frame algorithms for fast and slow motion, tuning parameters, and C API implementation for XM125 modules.
This guide describes the A121 radar sensor breathing reference application, detailing algorithms for distance determination, time series analysis, and breathing rate estimation.
User guide for the Acconeer I2C Presence Detector application, detailing the register-based interface for XM125 modules and A121 radar sensors.
A technical guide for integrating the Acconeer A121 radar sensor with STM32CubeIDE, covering project setup, pin configuration, and software integration for the XM125 and XE121.
User guide for the Acconeer A121 radar sensor assembly test, used to verify PCB assembly and assist in hardware/software bring-up using the Acconeer SDK.
