1. Product Overview
FMCW Microwave Radar Human Presence Sensor Module — LD6004
LD6004 is a radar sensing module developed based on the ADT6101P chip. It integrates a 57–64 GHz RF transceiver system on-chip, a 2T2R AiP packaged antenna, 1MB flash, a radar signal processing unit, and an ARM® Cortex®-M3 core.
Based on FMCW (Frequency-Modulated Continuous Wave) signal processing and radar signal processing algorithms, this module enables highly sensitive human status sensing. It can identify motion, micro-motion, and stationary human presence, and can also provide auxiliary information such as target distance and speed.
With a 2-transmit / 2-receive antenna configuration, the module features a wide beam angle and is suitable for ceiling-mounted installations. It supports GPIO and UART signal outputs, making it flexible for various smart applications and products.
2. Product Features
· Radar detection based on FMCW (frequency-modulated continuous wave) signals
· Supports tracking of up to 3 human targets; outputs target position coordinates x, y, z
· Detects indoor human movement and stationary presence with accurate identification within defined zones; supports sensing-zone partitioning and shielding to reduce interference inside/outside zones
· Supports side-mount mode switching; maximum sensing distance up to 6 m
· Wide detection angle: ±60° horizontal, ±60° pitch
· Standard UART interface; communication protocol provided; UART parameters adjustable to fit different scenarios
· Compact size: 35x7 mm; supports both pin-header connection and SMT connection
· Not affected by temperature, humidity, noise, airflow, dust, light, and other environmental factors
3. Specifications
Parameter | Min | Typ | Max | Unit |
Detection targets | .. | .. | 3 | persons |
Distance accuracy | .. | 0.4 | .. | m |
Side-mount sensing distance | 0 | .. | 6 | m |
Recognition accuracy | .. | 95 | .. | % |
Operating voltage (VCC) | 3.1 | 3.3 | 3.5 | V |
Operating current (ICC) | .. | 135 | 600 | mA |
Operating temperature (TOP) | -20 | .. | 85 | °C |
Storage temperature (TST) | -40 | .. | 85 | °C |
Operating frequency | 58 | .. | 64 | GHz |
Transmit power (Pout) | .. | 12 | .. | dBm |
Antenna gain | .. | 4 | 60 | dBi |
Horizontal beam (-3 dB) | -60 | .. | 60 | ° |
Vertical beam (-3 dB) | -60 | .. | .. | ° |
Dimensions

4. Product Usage
4.1 Pin Description

Name | Description | Notes |
3.3V | POWER INPUT 3.3V | .. |
OUT | GPIO_P20 / UART2 TXD | High level when presence detected in zone |
RX0 | GPIO_P01 / UART0_TXD | .. |
TX0 | GPIO_P00 / UART0_TXD | .. |
GND | GND | .. |
3.3V | POWER INPUT 3.3V | .. |
SWCLK | SWD Debug Clock | For debugging |
SWDIO | SWD Debug Signal | For debugging |
GND | GND | .. |
4.2 Boot Configuration
BOOT1 | BOOT0 | Notes | |
Configuration level | 0 | 1 | Boot from internal Flash |
Pin number | Pin8 | Pin12 |
Note: BOOT1 and BOOT0 have internal pull-ups in the module. Before module startup, BOOT1 must be tied to LOW level.
5. Precautions
1. The detection distance of the radar module is highly related to the target RCS and environmental factors. The effective detection distance may vary with the environment and target. Therefore, fluctuations within a certain range are normal.
2. The radar module has strict power supply requirements: input voltage 3.1–3.5 V, ripple ≤ 50 mV, and current capability ≥ 1 A. If using a DC-DC power supply, the switching frequency must be no lower than 2 MHz.

