Digilent PmodBT - Manual

P P m m o o d d B B T T ™ ™ R R e e f f e e r r e e n n c c e e M M a a n n u u a a l l
Revision: January 17, 2011
Note: This document applies to REV C of the board.
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Overview
The PmodBT is a wireless communication
peripheral module with a fully-integrated
Bluetooth interface. The PmodBT’s simple
UART interface and profile support let you use
the module’s robust functionality with a
minimum of extra code. This makes it the
perfect solution for embedded wireless
communication between a PC, PDA, or smart
phone and any number of remote applications.
Features include:
• a National Semiconductor LMX9838
Bluetooth serial port module
• a UART interface
• a 12-pin header Pmod interface
connector
• a wide range of profiles including the
Generic Access Profile, Service
Discovery Application Profile, and the
Serial Port Profile
• 2.5V – 3.6V operating voltage
• a small form factor: 0.8” x 1.5”
Functional Description
The PmodBT provides Bluetooth support in
either a transparent cable-replacement mode
or a more powerful command mode. The main
communication interface with the PmodBT is
the UART on J1 with hardware handshaking
and a hardware reset pin.
UART Interface
The UART interface’s factory default setting
uses eight data bits, no parity bit, and one stop
bit. The baud rate is selectable via the mode
jumpers of J2. Table 1 gives some sample
baud rate settings for J2. A ‘1’ signifies a
shorted jumper and ‘0’ signifies open.
J2 Pin 1
(OP3) J2 Pin 3
(OP4) J2 Pin 5
(OP5) Baud
1 0 0 Select from
NVS Table
1 0 1 9600 bps
1 1 0 115.2 kbps
1 1 1 921.6 kbps
Table 1 UART Speed Select Jumper Settings
National
Semiconductor
LMX9838
RTS
RXD
TXD
CTS
GND
VCC
PmodBT Block Diagram
1
2
3
4
5
6
1 2
J2
7
8
9
10
11
12
NC
VCC
RST
NC
NC
GND
VCC
OP3
OP4
OP5
J1
3 4
6 5