Specifications

Ra-01SC Specification V1.1

6.5

GPIO

（1） There are some GPIO ports on the periphery of the module. If you need to use a 10-100 ohm resistor

in series with the IO port, it can suppress overshoot and make the levels on both sides more stable, which is

helpful for EMI and ESD.

（2） For the pull-up and pull-down of special IO ports, please refer to the instructions in the

specification, which will affect the startup configuration of the module;

（3） The IO port of the module is 3.3V. If the main control and the IO level of the module do

not match, a level conversion circuit needs to be added

（4） If the IO port is directly connected to a peripheral interface, or a terminal such as a

header, it is recommended to reserve an ESD device near the terminal of the IO trace.

Table Level switching circuit

6.6

Software writing

(1) This module is LLCC68+ peripheral circuit, users can operate according to LLCC68 chip

manual；

(2) DIO1,DIO2,DIO3 are general-purpose IO ports, which can be configured into multiple

functions；

(3) The control of the RF switch TX/RX is completed by the internal circuit of the module by

default. But the interface is reserved in the design, which can realize external MCU

control. If you need external MCU control, please contact Ai-Thinker technicians to

replace the module BOM.

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