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5
Table 3 Pin definition talble
Pin NO. Item
Direction
Function
Remark
1
GND
Input
Ground
2
VL-
--
Low voltage power
supply
Low voltage supply pins, no need to concern
3
VCC
Input
Power positive
Power positive (to be shorted to pin 4 "VH+" when used)
4
VH+
Input
Power positive
Power positive (to be shorted to pin 3 “VCC” when used)
5
GND
Input
Ground
6
GND
Input
Ground
7
RST
Input
Reset pin
Reset in low level
（
take effective in 500ms
）
8
DIO1
Input
SWDIO
SWDIO
，
JTAG interface, no need to concern
9
NC
--
NC
no need to concern
10
CLK
Input
SWCLK
SWCLK
，
JTAG interface, no need to concern
11
NC
--
NC
no need to concern
12
GND
Input
Ground
Ground
13
WKP
Input
Wake up pin
Wake up
：
falling edge
；
Sleep
：
rising edge
14
TXD
Output
UART
UART output
15
RXD
Input
UART
UART Input
16
LINK
Output
Link status
Bluetooth linked
：
high level
Bluetooth not linked
：
low level
17
DATA
Output
Data
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.
18
GND
Input
Ground
Ground
