Bluetooth Connectivity
Figure 16. Bluetooth driver
Because this application uses USB and Bluetooth communication both through the serial communication interface (SCI) module,
a QS3VH253Q multiplexor is used to control what communication is used.
Figure 17. Communication multiplexor
8.2.1 Baud Rate Configuration
The LMX9838 provides a UART interface to communicate with the MCU through the SCI module. The UART interface
supports formats of 8-bit data with or without parity with one or two stop bits. It can operate at standard baud rates from 2400
bits/s up to a maximum baud rate of 921.6 kbits/s. The UART baud rate is configured during startup by checking option pins
OP3, OP4, and OP5. Table 4 shows different UART frequency settings.
Implementing a Glucometer and Blood Pressure Monitor Medical Devices, Rev. 1, 4/2010
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