Ebyte E104-BT52 User Manual page 8

7 RST
8 DIO
1
9 NC
10 CLK
11 NC
12 GND
13 WKP
14 TXD
15 RXD
16 LINK
17 DATA
18 GND
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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
Reset in low level（take effective in 500ms）
SWDIO，JTAG interface
/
SWCLK，JTAG interface
/
Ground
Wake up：falling edge；Sleep：rising edge
UART output
UART Input
Linked：high level
Not linked：low level
Data indication pin
Note:
Receive Bluetooth data:
When the DATA pin has Bluetooth data in the air to send out
through the TXD pin of BT52, the pin will be pulled high. After a
frame of data is sent, the pin will be pulled low again.
Send Bluetooth data:
After the DATA pin receives the data on the RXD pin of BT52,
the buffer BUFF size is 2K. As long as there is data in the BUFF
that has not been sent out via Bluetooth, the DATA will be pulled
high. It will be pulled low again until the data transmission in the
BUFF is completed. The user can use the above description to do
data framing.
Ground
4