PCF87852

General description

The PCF87852 combines the Bluetooth^TM protocol stack, Link Controller (LC), Link Manager (LM), and Host Controller Interface (HCI) firmware of the Bluetooth system specification in a single IC with embedded software. Together with an RF module, a few external components and an antenna it forms a Bluetooth system. In most cases this module will be attached to a host, for example a GSM baseband controller or a PC processor. The PCF87852 may also be used for embedded Bluetooth applications by running the upper software layers also from the on-chip memory. Together with an external voice codec a Bluetooth headset application can be realized.

The industry standard ARM7TDMI^TM microcontroller with low power consumption is integrated together with ROM memory and SRAM. There are no provisions for external controllers to directly access on-chip data memory. Communication with an external host, for example a PC, GSM or PDA, is handled via the HCI.

Industry standard interfaces such as I²C-bus^TM, PCM and IOM^® are supported by on-chip hardware. Additionally, a UART interface is available that can be used as the Bluetooth host controller interface.

The Bluetooth controller consists of a number of functional blocks that operate under control of the embedded microcontroller. The microcontroller has access to these blocks via the AMBA System Bus (ASB) and the VLSI Peripheral Bus (VPB).

The PCF87852 is designed to be used together with an RF IC as low-cost, low-power, radio-based cable replacement or wireless link. This link will be the basis for PCs, telephones, PDAs and peripherals to communicate together on an ad-hoc basis. It will replace cables and enables a wireless personal network.

The PCF87852 is especially suited for applications without the need for analog voice input or output, e.g. cellular telephones or computing platforms.

Features

Baseband hardware

• Embedded ARM7TDMI microprocessor
• 224 kbytes ROM memory
• 38 kbytes SRAM memory
• 8 kbytes internal data RAM (IRAM) for Bluetooth controller
• Watchdog timer
• Two 32-bit system timers
• Bluetooth controller including scrambling, CRC generation and checking, FEC encoding and decoding and ciphering according the ?Specification of the Bluetooth System, Version 1.1?
• Bluetooth connections supporting:
• Maximum 3 active connections (ACL)
• One voice connection (SCO).
• CVSD transcoder
• RF interface
• RSSI measurement
• On-chip 1.8 V voltage regulator
• 8-bit D/A and A/D conversion for various purposes; e.g. PA control
• Power-on reset
• System clock crystal oscillator
• Low-power crystal oscillator for a low-frequency clock input
• System clock request signal for control of external clock source
• Microprocessor interfaces including UART, I²C-bus, combined PCM/IOM and general purpose I/O-pins
• Patch mechanism for code updates and corrections.

Firmware

• Interface drivers
• Bluetooth controller driver
• Link Controller (LC)
• Link Manager (LM)
• Host Controller Interface (HCI)
• L2CAP, RFCOMM and SDP
• Small profiles and application software (i.e Bluetooth headset).

General

• Core and interface supply: 1.8 V; RF interface supply: 2.7 V to 3.4 V
• Operating temperature range: -40 Cel to +85 Cel
• Package: LFBGA73 (7 x 7 mm² and 0.5 mm pitch).

Applications

• Cell phones and smart phones
• Computing applications (PC, notebook and PDA)
• Cellular accessories (Bluetooth headsets).

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