LMX5452

Controller and Radio

1.0 General Description

The LMX5452 is a highly integrated Bluetooth 1.2 compliant

solution. The integrated baseband controller and 2.4 GHz

radio combine to form a complete, small form-factor (6.1 mm

x 9.1 mm x 1.2 mm) Bluetooth node.

The baseband controller has a standard Host Controller

Interface (HCI). Based on the National Semiconductor Com-

pactRISCTM 16-bit processor, the LMX5452 is optimized to

handle the audio, data, and link management processing

requirements of a Bluetooth node.

The on-chip memory, ROM, and Patch RAM provide lowest

cost and minimize design risk with the flexibility of firmware

upgrades.

The firmware supplied in the on-chip ROM supports a com-

plete Bluetooth Link Manager and HCI with communication

through a UART or USB interface. This firmware features

point-to-point and point-to-multipoint link management, sup-

porting data rates up to 723 kbps.

The radio employs an integrated antenna filter and switch to

minimize the number of external components.

The radio has a heterodyne receiver architecture with a low

intermediate frequency (IF), which enables the IF filters to be

integrated

on-chip.

The

transmitter

uses

direct

IQ-

modulation with Gaussian-filtered bit-stream data, a voltage-

controlled oscillator (VCO) buffer, and a power amplifier.

The LMX5452 module is lead free and RoHS (Restriction of

Hazardous Substances) compliant. For more information on

those quality standards, please visit our green compliance

website at http://www.national.com/quality/green/

2.0 Applications

•

Mobile Handsets

•

USB Dongles

•

Stereo Headsets

•

Personal Digital Assistants

•

Personal Computers

•

Automotive Telematics

3.0 Features

n

Compliant with the Bluetooth 1.2 Core Specification

n

-80 dBm receiver sensitivity (typical)

n

Class 2 operation

n

Low power consumption:

— Advanced power management features

— Clocking option 12/13 MHz with PLL bypass mode for

power reduction

n

High integration:

— Implemented in 0.18 µm CMOS technology

— RF includes on-chip antenna filter and switch

— On-chip firmware with complete HCI

n

Embedded ROM and Patch RAM memory

n

Up to seven Asynchronous Connection Less (ACL) links

n

Support for two simultaneous voice or Synchronous

Connection Oriented (SCO) links

n

Accepts10-20 MHz external clock or crystal network

n

Fractional-N Sigma/Delta modulator

n

Operating voltage range 2.5–3.6V

n

I/O voltage range 1.6–3.6V

n

60-pad micro-module BGA package (6.1 mm x 9.1 mm x

1.2 mm)

4.0 Interfaces

n

Full-duplex UART supporting transfer rates up to 921.6

kbps including baud rate detection for HCI

n

Full speed (12 Mbps) USB 2.0 for HCI

n

ACCESS.bus and SPI/Microwire for interfacing with

external non-volatile memory

n

Advanced Audio Interface (AAI) for interfacing with

external 8-kHz PCM codec

n

Up to 3 GPIO port pins (OP4/PG4, PG6, PG7)

controllable by HCI commands

n

JTAG based serial on-chip debug interface

n

Single Rx/Tx-pad radio interface

February 2006

© 2006 National Semiconductor Corporation

DS201804

www.national.com