PRELIMINARY
CYW43438
7. Bluetooth + FM Subsystem Overview
The Broadcom CYW43438 is a Bluetooth 4.1-compliant, baseband processor and 2.4 GHz transceiver with an integrated FM/RDS/
RBDS receiver. It features the highest level of integration and eliminates all critical external components, thus minimizing the footprint,
power consumption, and system cost of a Bluetooth plus FM radio solution.
The CYW43438 is the optimal solution for any Bluetooth voice and/or data application that also requires an FM radio receiver. The
Bluetooth subsystem presents a standard Host Controller Interface (HCI) via a high speed UART and PCM interface for audio. The
FM subsystem supports the HCI control interface as well as PCMand stereo analog interfaces. The CYW43438 incorporates all
Bluetooth 4.1 features including secure simple pairing, sniff subrating, and encryption pause and resume.
The CYW43438 Bluetooth radio transceiver provides enhanced radio performance to meet the most stringent mobile phone
temperature applications and the tightest integration into mobile handsets and portable devices. It is fully compatible with any of the
standard TCXO frequencies and provides full radio compatibility to operate simultaneously with GPS, WLAN, NFC, and cellular radios.
The Bluetooth transmitter also features a Class 1 power amplifier with Class 2 capability.
7.1 Features
Major Bluetooth features of the CYW43438 include:
■ Supports key features of upcoming Bluetooth standards
■ Fully supports Bluetooth Core Specification version 4.1 plus enhanced data rate (EDR) features:
❐ Adaptive Frequency Hopping (AFH)
❐ Quality of Service (QoS)
❐ Extended Synchronous Connections (eSCO)—voice connections
❐ Fast connect (interlaced page and inquiry scans)
❐ Secure Simple Pairing (SSP)
❐ Sniff Subrating (SSR)
❐ Encryption Pause Resume (EPR)
❐ Extended Inquiry Response (EIR)
❐ Link Supervision Timeout (LST)
■ UART baud rates up to 4 Mbps
■ Supports all Bluetooth 4.1 packet types
■ Supports maximum Bluetooth data rates over HCI UART
■ Multipoint operation with up to seven active slaves
❐ Maximum of seven simultaneous active ACL links
❐ Maximum of three simultaneous active SCO and eSCO connections with scatternet support
■ Trigger Beacon fast connect (TBFC)
■ Narrowband and wideband packet loss concealment
■ Scatternet operation with up to four active piconets with background scan and support for scatter mode
■ High-speed HCI UART transport support with low-power out-of-band BT_DEV_WAKE and BT_HOST_WAKE signaling (see “Host
Controller Power Management” )
■ Channel-quality driven data rate and packet type selection
■ Standard Bluetooth test modes
■ Extended radio and production test mode features
■ Full support for power savings modes
❐ Bluetooth clock request
❐ Bluetooth standard sniff
❐ Deep-sleep modes and software regulator shutdown
■ TCXO input and auto-detection of all standard handset clock frequencies. Also supports a low-power crystal, which can be used
during power save mode for better timing accuracy.
Document Number: 002-14796 Rev. *K
Page 31 of 101
CYPRESS [ CYPRESS ]
