LMX9820ASM datasheet(14/44 Pages) NSC

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7.0 Functional Description (Continued)

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.

Figure 9. Transceiver Return Loss

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