Motorola A920 Service Manual page 92

A920: Bluetooth IC
A5600
BT_RX-
U5600
BT_RX+
FL5601
BT_TX+
BT_TX-
Description
The BCM2033 has an integrated radio transceiver that has been optimized for use in 2.4 GHz Bluetooth wireless systems. It has been designed to provide low-power,
low-cost, robust communications for applications operating in the globally available 2.4 GHz unlicensed ISM band. It is fully compliant with the Bluetooth RF Specifica-
tion v1.1 and meets or exceeds the requirements to provide the highest communication link quality of service.
The receiver has a high degree of linearity, an extended dynamic range, and high order on-chip channel filtering to ensure reliable operation in the noisy 2.4 GHz ISM
band. The BCM2033 also features a fully integrated transmitter. Baseband data is GFSK modulated and upconverted to the 2.4 GHz ISM band via an internal mixer. The
output Power Amplifier (PA) provides a nominal power output of 0 dBm and has a power control to provide 24 dB of gain control in 8 dB step sizes. Local Oscillator
(LO) generation provides fast frequency hopping (1600 hops/second) across the 79 maximum available channels.
The uPU runs software from the Link Control (LC) layer, up to the Host Controller Interface (HCI). The microprocessor is an enhanced performance 8051 micro-
controller.
The BBC manages the buffering, segmentation, and routing of data for all connections. It also buffers data that passes through it, handles data flow control, schedules
SCO/ACL TX/RX transactions, monitors Bluetooth slot usage, optimally segments and packages data into baseband packets, manages connection status indicators, and
composes and decodes HCI packets.
The Peripheral Transport Unit (PTU) handles the Device Interface. The PTU supports three types of devices: USB, UART, and PCM.
The PMU provides power management features that can be invoked by either software through power management registers, or "packet handling" in the baseband core.
BLUETOOTH
IC
U5600
2.4GHz
Baseband Core
Transceiver
V1
V2
Frequency
Synthesizer Management Unit
uP Unit
(UPU)
Bluetooth
(BBC)
Peripheral
Transport Unit
(PTU)
Power
(PMU)
BLUE_HOST_WAKE*
BLUE_WAKE*
BLUE_CLK_EN*
USB_DP
HELEN
USB_DM
POG
ASAP_RXD
ASAP_TXD
ASAP_FS PCAP
ASAP_CLK
CLK_32_768K
REF_OSC_15_36M
Harmony
Lite