Hardware Description - Hi-Link HLK-LD2420 User Manual

3. Hardware Description

The picture below shows the front and back of the module. The module is equipped with 5 pin
holes (factory does not come with pins) called J2 for power supply and communication; J1 is the
SWD J1 is the SWD interface, which is used for MCU program burning and debugging.
J#PIN# Name
J1Pin1 GND
J1Pin2 DIO
J1Pin3 CLK
J1Pin4 3V3
J#PIN# Name
J2Pin1 3V3
J2Pin2 GND
J2Pin3 OT1
J2Pin4 RX
J2Pin5 OT2
Note: J1, J2 interface pin spacing 2.54 mm.
HLK-LD2420
Front
Figure 3-1 Physical drawing of the front and back of the module
Table 3-1 J1 Pin Description
Function
Grounding
SWD Interface Data Cable
SWD Interface clock line
Power input
Table 3-2 J2 Pin Description
IO for reporting detection status: high for occupied,
low for unoccupied
第 4 页 共 14 页
Function
Power input
Grounding
UART_RX
UART_TX
User Manuals
Reverse side
Description
0 ~ 3.3 V
0 ~ 3.3 V
3.0 V ~ 3.6 V，Typ.3.3V
Description
3.0 V ~ 3.6 V，Typ.3.3 V
0 ~ 3.3 V
0 ~ 3.3 V
0 ~ 3.3 V