Chengdu Ebyte Electronic Technology Co.,Ltd.
E78-400M22S1C User Manual
Copyright ©2012–2021，Chengdu Ebyte Electronic Technology Co.,Ltd.
8
51
ANT
Output
Antenna interface, stamp hole (50 ohm characteristic impedance)
52
GND
-
Ground wire, connected to the power reference ground
★
For the pin definition,software driver and communication protocol of the module, please refer to ASR official
《
ASR6601SE Datasheet
》 ★
4 E78-400M22S1C development
In the process of software development, please be sure to follow ASR6601SE official user manual and related
software development materials in detail, details see ASR official;
The E78-400M22S1C module has a built-in 32MHz TCXO. The crystal power supply uses the PWR_TCXO pin of
the ASR6601SE chip. The recommended voltage is 1.8V;
The module has a built-in external 32.768KHz crystal oscillator, and the load capacitance of the crystal oscillator is
programmable inside the ASR6601SE chip;
Module firmware download can use SWD and UART two ways, the pins are respectively:
The module integrates a radio frequency switch, which supports two modes of single control and dual control, see
the table below for details
：
Operating mode
GPIO10
GPIO59
Remark
Transmit mode
1
1
Single control mode
Receive mode
1
0
Single control mode
Others: GPIO59 (LORA_RF_SWITCH) is the DIO2 pin with built-in RF. After the official SDK is modified to
TCXO mode, it can be directly downloaded to the module for running test.
Download port
Pin description
SWD
GPIO06 (SWDATA), GPIO07 (SWCLK), NRST respectively are the 9th, 10th, and
11th pins
Serial
UART0_RX and UART0_TX respectively are the 25th and 26th pins
Note: Use the official SDK, before starting to download, please connect GPIO02 to high level, then restart the module
to enter the serial download mode.
