Chengdu Ebyte Electronic Technology Co,;Ltd E30 -490T20S user manual
Copyright ©2012–2019
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Chengdu Ebyte Electronic Technology Co,;Ltd
6
4
TXD
Output
TTL UART outputs, connects to external RXD (MCU, PC) input pin. Can
be configured as open-drain or push-pull output
5
AUX
Output
To indicate module ’ s working status & wakes up the external MCU.
During the procedure of self-check initialization, the pin outputs low
level. Can be configured as push-pull output (suspending is allowed).
6
VCC
Input
Power supply
：
2.3~ 5.5V DC
7
GND
Input
Ground
8
ANT
Input
Antenna interface (high frequency signal output)
9
Fixed orifice
Fixed orifice
10
Fixed orifice
Fixed orifice
11
Fixed orifice
Fixed orifice
4 Connect to MCU
No.
Description
（
STM8L MCU
）
1
The UART module is TTL level.
2
For some MCU works at 5VDC, it may need to add 4-10K pull-up resistor for the TXD & AUX pin.
