LMX9820SB National Semiconductor, LMX9820SB Datasheet - Page 30

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LMX9820SB

Manufacturer Part Number
LMX9820SB
Description
MODULE BLUE TOOTH 116-LTCC
Manufacturer
National Semiconductor
Datasheet

Specifications of LMX9820SB

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
Antenna Connector
PCB, Surface Mount
Operating Temperature
-40°C ~ 85°C
Package / Case
116-LTCC
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Memory Size
-
Other names
*LMX9820SB
www.national.com
13.0 Usage Scenarios
13.2 SCENARIO 2: AUTOMATIC POINT-TO-POINT
CONNECTION
LMX9820 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.
Serial Device #1
6. Switch to
Bluetooth™ device controls link with
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
Connected on Port L
Store Default Device
SDP Link Released
(Optional)
Establish SPP Link
Establish SDP Link
RFComm Port = R
Release SDP Link
Transparent
Transparent Mode
available?
Service Browse
Device Stored
Inquiry Result
Microcontroller
Inquiry
a few commands
(Continued)
Figure 19. Automatic Point-to-Point Connection
Storing Default Device
SDP Link Established
SDP Link Released
Establish SPP Link
to Port R on Port L
Establish SDP Link
Release SDP Link
Transparent Mode
Link Established
Service Browse
Browse Result
Device Stored
Inquiry Result
LMX9820
Inquiry
Raw Data
Interface
30
Air
If step 5 is executed, the stored default device is connected
(step 4) after reset (in Automatic mode only) or by sending
the command “Connect to Default Device”. The command
can be sent to the device at any time.
If step 6 is left out, the microcontroller has to use the com-
mand “Send Data” 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
No Bluetooth™ commands necessary;
SDP Link Accept
Release Confirm
Inquiry Request
Service Browse
LMX9820
Microcontroller
on Port R
Connected

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