Ebyte E104-BT52 User Manual page 9

Table 3 Pin definition talble
Pin NO. Item
1 GND
2 VL-
3 VCC
4 VH+
5 GND
6 GND
7 RST
8 DIO1
9 NC
10 CLK
11 NC
12 GND
13 WKP
14 TXD
15 RXD
16 LINK
17 DATA
18 GND
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Direction Function
Input Ground
-- Low voltage power
supply
Input Power positive
Input Power positive
Input Ground
Input Ground
Input Reset pin
Input SWDIO
-- NC
Input SWCLK
-- NC
Input Ground
Input Wake up pin
Output UART
Input UART
Output Link status
Output Data
Input Ground
Remark
Low voltage supply pins, no need to concern
Power positive (to be shorted to pin 4 "VH+" when used)
Power positive (to be shorted to pin 3 "VCC" when used)
Reset in low level（take effective in 500ms）
SWDIO，JTAG interface, no need to concern
no need to concern
SWCLK，JTAG interface, no need to concern
no need to concern
Ground
Wake up：falling edge；Sleep：rising edge
UART output
UART Input
Bluetooth linked：high level
Bluetooth not linked：low level
Data indication pin
Note:
Receive Bluetooth data:
When there is Bluetooth data in the air to send out through the
TXD pin of E104-BT52/E104-BT52X, the DATA pin will be
pulled high. After a frame of data is sent, the pin will be pulled
low again.
Send Bluetooth data:
After the RXD pin of E104-BT52/E104-BT52X receives the data,
the DATA pin cache BUFF size of 2K. As long as there is data in
the BUFF that has not been sent out via Bluetooth, the DATA pin
will be pulled high. It will be pulled low again until the data in the
BUFF is completely transmitted. The user can use the above
description to do data framing.
Ground
5