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BLE2U
recommended to use CTS/RTS flow control to prevent buffer overflow when the baud rate exceeds 9600bit/s
and the BLE average RSSI is less than -70dBm. The USB interface is a USB2.0 full-speed device, which
communicates with PC through analog serial port device, and is compatible with common serial software.
8.3 LED function
List of LED status description
No.
1
once quickly flashes 3 times after powered on
2
twice quickly flashes 3 times after powered on
3
slowly flashes at 500ms intervals
4
5
quickly flashes in connection status
6
quickly flashes in pairing process
For details, please refer to CH9143 datasheet.
9. Schematic diagram for reference
1
S1
3
GND
Select 1 for master-slave mode
Select 3 for slave mode
Status
keeps on
U1
1
GND
GND
2
PANT
3
SWREG_EN
2
4
BLE_MODE
5
RTS#
6
DCD#
7
RI#
8
CTS#
BLE2U-C
GND
7
currently in master-slave mode
currently in broadcast status
currently in connection status
currently performing data transmission
has been paired with other devices, need
power-up again to complete pairing
24
TNOW
23
RST#
22
RXD
21
TXD
20
UD-
19
UD+
18
DTR#
17
FCE
D1
R2
1K
3V3
LED0
Description
currently in slave mode
RXD_CONNECT_MCU_TXD
TXD_CONNECT_MCU_RXD
CONNECT_MCU_UD-
CONNECT_MCU_UD+
3V3
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