RoadTunes® ROM QFN Automotive

General Description
Based on BlueCore®5 Multimedia QFN, the RoadTunes ROM QFN Automotive integrates a Bluetooth radio, baseband, DSP, high-quality audio codec, SMPS, LDOs and a battery charger for minimal BOM, component count and PCB area.
RoadTunes ROM QFN Automotive is the most integrated SW ROM chip on the market with 6 profiles at low cost and very short development cycle.

Applications
RoadTunes is the new Bluetooth host-based software solution from CSR. By integrating a simple software interface on their processor, CSR customers have access to a multitude of tested Bluetooth profiles:
A2DP (source and sink), AVRCP (target and controller), HFP, SPP and PBAP. This software interface enables commands to control the chip via UART and requires very low additional MIPS on the main processor. The software contains an automotive grade echo cancellation and noise reduction solution in the form of the CSR's new cVc Gen 4 algorithm.

Radio
Common TX/RX terminal simplifies external matching; eliminates external antenna switch
BIST minimises production test time
Bluetooth v2.0 + EDR specification compliant

Transmitter
7dBm RF transmit power with level control from on-chip 6-bit DAC over a dynamic range >30dB
Class 2 and Class 3 support without the need for an external power amplifier or TX/RX switch

Receiver
Receiver sensitivity of -90dBm
Integrated channel filters
Digital demodulator for improved sensitivity and co-channel rejection
Real-time digitised RSSI available on HCI interface
Fast AGC for enhanced dynamic range

Synthesiser
Fully integrated synthesiser requires no external VCO, varactor diode, resonator or loop filter. Compatible with crystals (16MHz to 26MHz) or an external clock (12MHz to 52MHz)

Physical Interfaces
Synchronous serial interface for system debugging UART interface

Auxiliary Features
Crystal oscillator with built-in digital trimming
Power management includes digital shutdown and wake-up commands with an integrated low-power oscillator for ultra low power Park/Sniff/Hold mode
Clock request output to control external clock
On-chip regulators: 1.5V output from 1.8V to 2.7V input
On-chip high-efficiency switched-mode regulator: 1.8V output from 2.7V to 4.4V input
Power-on-reset cell detects low-supply voltage
10-bit ADC available to applications
On-chip 150mA charger for lithium ion/polymer batteries

Kalimba DSP
Very low-power Kalimba DSP co-processor, 64MIPS, 24-bit fixed point core
Support for SBC and MP3 codec for improved audio quality
Single-cycle MAC; 24x24-bit multiply and 56-bit accumulator
32-bit instruction word, dual 24-bit data memory
6Kx32-bit program RAM, 8Kx24-bit + 8Kx24-bit data RAM
64x32-bit program memory cache when executing from ROM