LMX9820SBX/NOPB National Semiconductor, LMX9820SBX/NOPB Datasheet - Page 31

• Manufacturer Part Number: LMX9820SBX/NOPB
• Manufacturer: National Semiconductor

Specifications of LMX9820SBX/NOPB

• Lead Free Status / Rohs Status: Compliant

Revision 1.0
13.3 SCENARIO 3: POINT-TO-MULTIPOINT CON-
NECTION
LMX9820 acts as master for several slaves.
Example: Two sensors with LMX9820; one hand-held
device with implemented LMX9820.
Serial Devices #2 and #3 establish the link automatically as
soon as they are contacted by another device. No control-
ler interaction is necessary for setting up the Bluetooth link.
Both switch automatically into Transparent mode. The host
sends raw data over the UART.
Serial Device #1
Connect to Device #2
Connect to Device #3
Send Data to Port L1
Send Data to Port L2
Link Established
Link Established
see Scenario 2
Data Received
see Scenario 2
Data Received
Microcontroller
from Port L1
from Port L2
on Port L1
on Port L2
Send Data Command
Send Data Command
Connect to Device #2
Connect to Device #3
Receive Data Event
Receive Data Event
Link Established
Link Established
Figure 20. Point-to-Multipoint Connection
see Scenario 2
see Scenario 2
LMX9820
31
Interface
Air
Serial Device #1 is acting as master for both devices. As
the host has to decide to or from which device data is com-
ing from, data must be sent using the “Send data com-
mand”. If the device receives data from the other devices, it
is packaged into an event called “Incoming data event”.
The event includes the device related port number.
If necessary, a link configuration can be stored as default in
the master Serial Device #1 to enable the automatic recon-
nect after reset, power-up, or by sending the “connect
default connection” command.
Serial Device #2
Serial Device #3
Raw Data
Raw Data
Automatic Link Setup
Automatic Link Setup
Connection Request
Connection Request
Transparent Mode
Transparent Mode
LMX9820
LMX9820
Connected
on Port L
Microcontroller
Microcontroller
on Port L
Connected
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