Ebyte E49-400T20S User Manual page 8

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17 NC
18 NC
19 GND Module ground wire
20 GND Module ground wire
21 ANT antenna
22 GND Module ground wire
4. Recommended wiring diagram
Ul MCU
19 18
—9 PC1 PCO O—>—
—9 PC4 PB7 O—5— 5 x
— 9 PAO PB6 © 15 a QQ Mo "
— PA1 PB5 O — Q M1 3
— 9 PA2 USART_RX O 1 A O RXD 2
—9 PA3 USART_TX O 12 QQ TXD =
gO vss PB4 O—3 5 J AUX | <
—0 vp PBI O—— ° q vee 4
—C0O PBO PB1 O——
VCC GND
Brief introduction of connection between the module and the single-chip microcomputer (the above picture uses
No. STMSL single-chip microcomputer as an example)
| The wireless serial port module is TTL level, please connect with MCU with TTL level.
) Some 5V microcontrollers may require 4 ~ 10K pull-up resistors on the TXD and AUX pins of the module.
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