LMX9820ASMX/NOPB National Semiconductor, LMX9820ASMX/NOPB Datasheet - Page 33

• Manufacturer Part Number: LMX9820ASMX/NOPB
• Description: MODULE BLUETOOTH SERIAL PORT SMD
• Manufacturer: National Semiconductor

Specifications of LMX9820ASMX/NOPB

• Frequency: 2.4GHz
• Data Rate - Maximum: 704kbps
• Modulation Or Protocol: Bluetooth v1.1, Class 2
• Applications: PDA's, POS Terminals
• Power - Output: 1dBm
• Sensitivity: -81dBm
• Voltage - Supply: 2.85 V ~ 3.6 V
• Current - Receiving: 65mA
• Current - Transmitting: 68mA
• Data Interface: PCB, Surface Mount
• Memory Size: 256Kb Flash
• Antenna Connector: PCB, Surface Mount
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 116-LTCC
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: LMX9820ASMX; LMX9820ASMXTR

13.0 Usage Scenarios
13.2 SCENARIO 2: AUTOMATIC POINT-TO-POINT
CONNECTION
LMX9820A at both sides.
Example: Serial Cable Replacement.
Device #1 controls the link setup with a few commands as
described.
1. Port R indicates the remote RFComm channel to connect to. Usually the result of the SDP request.
2. Port L indicates the Local RFComm channel used for that connection.
6. Switch to
Serial Device #1
1. Devices in Range?
2. Choose the Device
3. Which COM Port is
4. Create SPP Link
5. Connect on Default
SDP Link Established
to Port R1 on Port L2
Transparent Mode
Store Default Device
Connected on Port L
SDP Link Released
Establish SDP Link
RFComm Port = R
Establish SPP Link
Release SDP Link
Transparent
(Optional)
Microcontroller
available?
Service Browse
Device Stored
Inquiry Result
Bluetooth™ device controls link with
Inquiry
a few commands
(Continued)
Storing Default Device
Figure 22. Automatic Point-to-Point Connection
SDP Link Established
Establish SDP Link
SDP Link Released
Establish SPP Link
Transparent Mode
to Port R on Port L
Release SDP Link
Link Established
Service Browse
LMX9820A
Browse Result
Device Stored
Inquiry Result
Inquiry
Interface
Raw Data
33
Air
If step 5 is executed, the stored default device is connected
(step 4) after reset (in automatic mode only) or by sending
the “Connect to Default Device” command. The command
can be sent to the device at any time.
If step 6 is left out, the microcontroller has to use the “Send
Data” command, instead of sending data directly to the
module.
Serial Device #2
only “connected” event indicated to controller
Transparent Mode
SDP Link Request
Service Response
Release SDP Link
SPP Link Request
Inquiry Response
SPP Link Accept
SDP Link Accept
Release Confirm
Inquiry Request
Service Browse
LMX9820A
No Bluetooth™ commands necessary;
Microcontroller
on Port R
Connected
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