LMX9820A Datasheet, PDF (14/44 Pages) National Semiconductor (TI) – Bluetooth Serial Port Module

7.0 Functional Description (Continued)
Figure 9. Transceiver Return Loss
7.0 Functional Description
7.1 BASEBAND AND LINK MANAGEMENT
PROCESSORS
Baseband and Lower Link control functions are imple-
mented using a combination of National Semiconductor’s
CompactRISC 16-bit processor and the Bluetooth Lower
Link Controller. These processors operate from integrated
Flash memory and RAM and execute on-board firmware
implementing all Bluetooth functions.
7.1.1 Bluetooth Lower Link Controller
The integrated Bluetooth Lower Link Controller (LLC) com-
plies with the Bluetooth Specification version 1.1 and
implements the following functions:
• Support for 1, 3, and 5 slot packet types
• 79-channel hop frequency generation circuitry
• Fast frequency hopping at 1600 hops per second
• Power management control
• Access code correlation and slot timing recovery
7.1.2 Bluetooth Upper Layer Stack
The integrated upper layer stack is prequalified and
includes the following protocol layers:
• L2CAP
• RFComm
• SDP
7.1.3 Profile Support
The on-chip application of the LMX9820A allows full stand-
alone operation, without any Bluetooth protocol layer nec-
essary outside the module. It supports the Generic Access
Profile (GAP), the Service Discovery Application Profile
(SDAP), and the Serial Port Profile (SPP).
The on-chip profiles can be used as interfaces to additional
profiles executed on the host. The LMX9820A includes a
configurable service database to answer requests with the
profiles supported.
7.1.4 Application with Command Interface
The module supports automatic slave operation eliminating
the need for an external control unit. The implemented
transparent option enables the chip to handle incoming
data raw, without the need for packaging in a special for-
mat. The device uses a fixed pin to block unallowed con-
nections.
Acting as master, the application offers a simple but versa-
tile command interface for standard Bluetooth operations
such as inquiry, service discovery, and serial port connec-
tion. The firmware supports up to three slaves. Default Link
Policy settings and a specific master mode allow optimized
configuration for the application specific requirements. See
also Section "Integrated Firmware" on page 24.
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