Ebyte E78-900M22S1A, User Manual

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Chengdu Ebyte Electronic Technology Co., Ltd. E78-900M22S1A User Manual
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high-frequency analog, power wiring), it will also greatly affect the performance of the module. According to the
intensity of the interference, it is recommended to stay away from the module. Isolation and shielding;
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If the communication line uses 5V level, a 1k-5.1k resistor must be connected in series (not recommended, there is
still a risk of damage);
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Try to stay away from part of the physical layer that is also 2.4GHz TTL protocol, for example: USB3.0;

The antenna installation structure has a great impact on the performance of the module. Make sure that the antenna
is exposed, preferably vertically upward. When the module is installed inside the case, a high-quality antenna
extension cable can be used to extend the antenna to the outside of the case;
The antenna must not be installed inside the metal shell, which will greatly reduce the transmission distance.
4.1 Software Writing
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This module is STM8L152 integrated, and its driving method is completely equivalent to SX1262, and users can
operate according to SX1262 or ASR6505 chip book;
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At the same time, please refer to the E78-900M22S1A and E78-900TBL-01A pin corresponding STM8 data provided by our
company during the secondary development.
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The voltage range of the active crystal oscillator is 1.8V to 3V. 2.2V is recommended. 3.3V may be damaged.
4 Programming Diagram and Guide
4.1 E78-900M22S1A burning interface
Connect the module pins 30 and 31, and use ST-LINK or STM8 debugging tools to download the program.
For secondary development, you are recommended to use test kit E78-900TBL-01A . It is convenient and efficient. First,
power the module through the serial port of the test kit, and then connect the NRST pin and SWIM pin of ST-LINK to
the test kit to download the program. As shown above.