AIRTOUCH AT58L4M32-2020 5.8GHz Microwave Motion Sensor User Guide
- June 6, 2024
- AIRTOUCH
Table of Contents
AirTouch AT58L4M32-2020 5.8GHz Microwave Motion Sensor
AT58L4M32-2020
5.8GHz
Microwave Motion sensor
FCC ID: 2AVK2-AT5820-2020
Made in China
This device complies with Part 15 of the FCC Rules. Operation is subject to
the following two conditions
- this device may not cause harmful interference, and
- this device must accept any interference received, including interference that may cause undesired operation.
AT58L4M32-2020 5.8GHz User Guide
Description
AT58L4M32-2020 is a 5.8G radar sensor with low power consumption, which is
launched by AirTouch. The power consumption is about 20mA, and the module size
is 20mm * 20mm. The sensor adopts the self-developed radar induction chip
AT58MP1T1RS32A, which integrates a 5.8GHz microwave circuit, an intermediate
frequency amplifier circuit, a signal processing circuit, and a powerful MCU,
with high integration and good production consistency, A miniaturized patch
antenna is used in the periphery to ensure the performance of the sensor and
greatly reduce the overall size. Because of its low power consumption, low
cost, and compliance certification, the sensor has been widely used in
intelligent lighting, smart home, and other fields. This scheme is the first
choice for upgrading the traditional nonfixed frequency scheme, and also the
preferred scheme for improving the performance of traditional 5.8G microwave
induction products.
Input and Output Interface
Five pinholes are reserved in the module. There are five signal pins, VCC, GND, out, TX and Rx. The pin distance is 2.54mm. If you need to adjust the distance and delay time online, you can rewrite the internal parameters through the communication between TX, RX of UART with AT58MP1T1RS32A. The following table is the definition of each pin
| Pin Name | Function | Note |
|---|---|---|
| VIN | Power supply | VCC is 5V by default, external LDO is needed if VCC |
higher than 6V.
GND| Ground PIN|
OUT| Output control| Output is 5V TTL by default, could be PWM if needed
TX| TX of UART| used for software upgrade or performance parameter
adjustment. The high level voltage is 3.3V
RX| RX of UART| used for software upgrade or performance parameter
adjustment. The high level voltage is 3.3V
Module size and Pin position
Figure 2 below is the schematic diagram of module size and pin position. The length and width of the module is 20 mm * 20 mm. By default, there is no pin, and the overall thickness is 2.5 mm. If a pin is required, the default pin height is 12 mm.
Electrical characteristics
| Parameters | Min. | Typical | Max. | Unit | Note |
|---|---|---|---|---|---|
| Frequency | 5725 | 5875 | MHz | Adjustable according to specific needs | |
| TX Power | -5 | dBm | Adjustable according to specific needs | ||
| Input VCC | 4.5 | 5 | 5.5 | V | LDO is not pasted by default, and 5V is input |
by default
Output High （ OUT ）| | 5| | V|
Output High （ TX 、
RX and other GPIO ）
| | 3.3| | V|
Output Low| | 0| | V|
Current| | 20| 28| mA| Average working current
Detection Radius| | 6| 10| M| Related to mounting height
Hold time| | 15| | S| Adjustable according to
specific needs
Daylight sensor| | 10| | Lux| Adjustable according to
specific needs
Operating temperature| -30| | 85| °C|
The delay time and detection area The module has three pins by default, namely
VCC, GND, and OUT. The delay time and detection distance are fixed values. If
you need to adjust the delay time and detection distance and other related
parameters, you need to add RX and TX pins as shown in Figure 3. The RX and TX
interfaces in figure3 can be used as UART ports to adjust module parameters.
When they are used as UART ports, please refer to the document “AirTouch radar
setting tool instructions” for detailed instructions. If the sensor is
triggered again within the delay time, the timing will start
again.
Photosensitive Detection
The module supports photosensitive detection. The sample module does not turn
on the photosensitive detection function by default. The position shown in
Figure 3 is the photodiode.
The photosensitive threshold can be adjusted by changing the photosensitive
judgment threshold or tuning the photosensitive resistance. When the
photosensitive function is turned on, the radar sensing will be started only
when the ambient light is lower than the set value. If the light is too
bright, the module will not start the sensing function.
Power on Sequence
The module has a power-on self-test function, that is, after the module is powered on, ,the out pin outputs the high level first, the low level is output after the delay of 2s, and the low level is delayed for 0.5s before entering the normal induction mode. The following is the sequence diagram of the control signal after the module is powered on：
Detection Pattern
The sensing sensitivity of radar sensor can be configured by MCU, and its
limit sensing distance is 20 meters. The actual sensing distance can be
adjusted according to the needs. The following is the schematic diagram of
radar detection range in case of high hanging. Ifn the sensitivity is set
higher, the detection range will be correspondingly larger. In the figure, the
dark area is the high sensitivity area, which can be fully detected, while the
light area is
the low sensitivity detection area, which can basically detect
objects.
Precautions
- During installation, the front of the antenna shall be free of metal shell or parts to avoid signal shielding. Plastic or glass and other materials are allowed, but these materials shall not be close to the front of the antenna；
- Try to avoid pointing the radar antenna at the large metal equipment or pipeline, etc；
- When multiple radar modules are installed, the antennas of each radar module shall be parallel to each other as much as possible to avoid direct radiation between the antennas, and the distance between the modules shall be more than 1m；
- The radar sensor should avoid facing the AC driving power supply and keep away from the rectifier bridge of the driving power supply as far as possible to avoid the interference of the power frequency；
- The power supply driving capacity of the radar module needs to be greater than 30mA, otherwise the sensor will work abnormally.
Revision History
| Revision | Release Date | Description |
|---|---|---|
| 1.0 | 2021/01/04 | Initial version |
| 1.1 | 2021/04/26 | Update the description of 4×4 chip |
| 1.2 | 2021/06/03 | Update the description of supply voltage |
Requirement of FCC KDB 996369 D03 for module certification:
- List of applicable FCC rules: The module complies with FCC Part 15.249
- Summarize the specific operational use conditions: The module has been certified for Fix, Mobile, Portable applications. This transmitter must not be co-located or operating in conjunction with any other antenna or transmitter.
- Limited module procedures: The module has not had its own RF shielding, The host should provide the RF shielding to the modular， which belong to the Limited module. Standard requires: Clear and specific instructions describing the conditions, limitations, and procedures for third parties to use and/or integrate the module into a host device (see Comprehensive integration instructions below). Resolve: Supply example as follows:
Installation Notes:
- AT58L4M32-2020 module Power supply range is DC 4.5-5.5V, when you use the AT58L4M32-2020 module design product, the power supply cannot exceed this range.
- When connecting the AT58L4M32-2020 module to the host device, the host device must be powered off.
- Make sure the module pins are correctly installed.
- Make sure that the module does not allow users to replace or demolition.
- Trace antenna designs: Not applicable.
- RF exposure considerations: This equipment complies with FCC’s RF radiation exposure limits set forth for an uncontrolled environment. The antenna(s) used for this transmitter must not be collocated or operating in conjunction with any other antenna or transmitter. Note: the host product manuals must include a statement in order to alert the users of FCC
- RF exposure compliance.
Type| Gain| Impedance| Application
---|---|---|---
PCB type| 2.3dBi| 50Ω| Fixed, Mobile, Portable
Label and compliance information This device complies with part 15 of the FCC rules. Operation is subject to the following two conditions:
-
this device may not cause harmful interference, and
-
this device must accept any interference received, including interference that may cause undesired operation.
Warning: Changes or modifications to this unit not expressly approved by the party responsible for compliance could void the user’s authority to operate the equipment.
NOTE: This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates uses and can radiate radio frequency energy and, if not installed and m used in accordance with the instructions, may cause harmful interference to radio
communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures:- Reorient or relocate the receiving antenna.
- Increase the separation between the equipment and receiver.
- Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.
- Consult the dealer or an experienced radio/TV technician for help.
The system integrator must place an exterior label on the outside of the final product housing the AT58L4M32-2020 Modules. Below is the content that must be included on this label. The host product Labeling Requirements:
NOTICE: The host product must make sure that FCC labeling requirements are met. This includes clearly visible exterior label on the outside of the final product housing that displays the contents are shown below: Contains FCC ID: 2AVK2-AT5820-2020
Additional testing, Part 15 Subpart B disclaimer: The modular transmitter is only FCC authorized for the specific rule parts (FCC Part 15.249) list on the grant, and that the host product manufacturer is responsible for compliance to any other FCC rules that apply to the host not covered by the modular transmitter grant of certification. The final host product still requires Part 15 Subpart B compliance testing with the modular transmitter installed when contains digital circuity. When testing host products, the host manufacturer should follow FCC KDB Publication 996369 D04 Module Integration Guide for testing the host products.The host product shall work normally, all the transmitters installed must be operating, investigate the fundamental and unwanted/spurious emissions with the modular transmitter(s) operating in a normal mode. When testing for emissions from the unintentional radiator, the transmitter shall be placed in the receive mode or idle mode if possible, if receive mode only is not possible, test, laboratories may need to add attenuation or filters depending on the signal strength of any active beacons (if applicable) from the enabled radio(s).