Advertisement
BLE2U
15
AT
RELOAD
16
/BLESTA
17
FCE
18
DTR#
19
UD+
20
UD-
21
TXD
22
RXD
23
RST#
24
TNOW
Note (1): P: Power. A: Analog. I: Input. O: Output. N: No connection.
Note (2): To use an external antenna, the user can connect the PANT pin to the antenna pin through the
reserved resistor pad. Re-solder the resistor which connects the antenna pin to on-board antenna, to
connect the antenna pin to the PANT pin.
6. Recommended bonding pad size for BLE2U-C
7. Layout
The upper part of the module is the onboard antenna, and the layout of antenna is related to quality of
wireless communication. Good communication quality can ensure a stable data transmission rate. The
module can run separately without extra ground plane, but when it is installed on the other PCB, it should be
noted: Antenna area must be far away from other metal components, and the distance must be greater than
20mm. Any conductor near the antenna may seriously affect the antenna radiation pattern.
5
AT transparent transmission function switch pin:
I
Low level: AT mode. High level: Transparent transmission mode
Restore factory setting input pin (RELOAD) when powered on,
Restore the factory settings after a low level is detected for 2
I/O
BLE connection status indication signal output pin (BLESTA)
after powered on. It outputs low level when not connected, while it
CTS/RTS flow control enable, active low, with built-in pull-up
I
O
UART MODEM output signal, data terminal ready
USB signal
USB signal
O
I
I
O
seconds continuously.
outputs high level when connected.
resistor
USB D + data line
USB D - data line
UART transmit pin
UART receive pin
Reset pin, active low
UART transmit status pin, active high
Symbol
Value
A
18.02
B
15.26
C
0.99
E
1.27
F
3.12
G
3.18
H
1.27
J
1.8
K
1
http://wch.cn
Unit
mm
Advertisement
