Ebyte E22 T30D Series User Manual page 12

Chengdu Ebyte Electronic Technology Co., Ltd.
4 TxD
5 RXD
6 M1
7 M0
11 ANT
12 GND
13
GND
14 GND
18 NC
19 NC
20 NC
twenty
NC
one
twenty
RESET
two
twenty
GND
three
twenty
NC
four
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For user to wakes up the external MCU and it outputs low level during
power-on self-check initialization; (can be left floating)
Outpu TTL Serial port output, connected to the external RXD input pin;
Input TTL Serial port input, connected to the external TXD output pin;
Work with M0 to decide 4 working modes of the module (cannot be left
Input (very weak
floating; can be grounded if not used).
pull-up)
Work with M1 to decide 4 working modes of the module (cannot be left
Input (very weak
floating; can be grounded if not used).
pull-up)
Antenna interface (high frequency signal output, 50ohm characteristic
Output
impedance)
Fixed ground wire
-
Fixed ground wire
-
Fixed ground wire
-
SWCLK
SWDIO
P2.4 as 485_EN
Internally connected to 3.3V as download power supply;
Input Reset pin when program is loaded (floating, user does not need to connect)
Input Ground pin when program is loaded (floating, user does not need to connect)
Empty pin
E22-xxxT30x series product user manual
12