Ebyte E79-900DM2005S, User Manual, Page: 10 / 13

Chengdu Ebyte Electronic Technology Co.,Ltd E79-900DM2005S User Manual
Copyright ©2012–2019
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Chengdu Ebyte Electronic Technology Co.,Ltd
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Note:

The chip used inside the module is DC/DC mode.

The Sub-1G band module comes with our own RF switch. Please follow the truth table strictly.
Truth Table
DIO_6 DIO_5 Transmit(TX) Receive(RX)
Low High ON OFF
High Low OFF ON

Burning program: The module is a SOC module with its own GPIO port. Download the program using the XDS100
downloader.

Program download interface definition:
6. FAQ
6.1 Communication range is too short

The communication distance will be affected when obstacle exists.

Data lose rate will be affected by temperature, humidity and co-channel interference.

The ground will absorb and reflect wireless radio wave, so the performance will be poor when testing near ground.

Sea water has great ability in absorbing wireless radio wave, so performance will be poor when testing near the sea.

The signal will be affected when the antenna is near metal object or put in a metal case.

Power register was set incorrectly, air data rate is set as too high (the higher the air data rate, the shorter the
distance).

The power supply low voltage under room temperature is lower than 2.5V, the lower the voltage, the lower the
transmitting power.

Due to antenna quality or poor matching between antenna and module.
6.2 Module is easy to damage

Please check the power supply source, ensure it is 2.0V~3.6V, voltage higher than 3.6V will damage the module.

Please check the stability of power source, the voltage cannot fluctuate too much.

Please make sure antistatic measure are taken when installing and using, high frequency devices have electrostatic
E79 Pins XDS100 Interfaces
JATG_TMSC TMS
JTAG_TCKC TCK
RESET_N SRSTN
GND DGND
VCC TVD