BLE2U
6
The figure below shows the reference layout of the module. The first three cases are correct, as long as the
ground plane does not exceed the ground plane edge of the module. The last three cases are incorrect. The
example on the left is incorrect because there is a ground plane under the antenna, the middle example is
incorrect because there is not enough gap around the antenna, and the last example is incorrect because
battery metal casing is not far away from antenna area.
8. Functional description
8.1 Smart pairing
When the CH9143 is in master-slave mode, it can be paired with the designated CH914x without inputting
MAC address through AT command. After successful pairing, the two will establish a binding relationship,
and there is no need to re-pair when connecting again.
Pairing process is as follows:
1) The CH9143 is in master-slave mode, and the CH9140/CH9143 is in slave mode or master-slave mode;
2) Both sides need to complete power-up within 3s to establish a pairing;
3) The indicator LED flashes 3 times and then keeps on, indicating that pairing is successful.
If the user needs to re-establish the pairing, repeat the pairing process again. The difference is that the
indicator LED in step 3 will flash quickly. In this case, the pairing can be re-established by powering on one
side.
8.2 Data transmission
The CH9143 can implement data transmission between UART, USB and BLE. The data received by any one
interface will be transmitted to the other 2 interfaces.
The serial port interface is an asynchronous UART.
The default setting is 115200bit/s baud rate, 8 data bits, 1
stop bit, no parity and enabled flow control. BLE communication rate is related to its environment, so it is
