Panasonic EB-X700 Service Manual page 25

4.7. Bluetooth Module
The X700 handset contains a Bluetooth module centered on Cambridge Silicon Radio's (CSR) BlueCore3-ROM IC
(U201).This provides short range (typically 10 meters or less) connectivity from the handset to Bluetooth-enabled devices
such asheadsets, car kits, and personal computers in order to transfer voice and/or data. Shown below is the block diagram
of the X700 Bluetooth interface.
OMAP310
U100
PMB8870
SGOLD
The Bluetooth IC connects to the UART2 interface on OMAP which provides the control and data interface to the application
processor.The 4-wire UART connection (TXD, RXD, RTS, CTS) uses the BlueCore Serial Protocol (H5) with error detection
and re-transmission.
The PCM audio connection from Bluetooth is connected to the I2S1 port on SGOLD. The PCM interface (with BT as the
Master) is configured for a 256kHz bit-clock and an 8kHz sync rate.
The Bluetooth chip is powered by the VRF3 (2.65v @ 150mA) regulator supplied by the SM-PWR IC. VRF3 supplies the I/O
block as well as an integrated 1.8v @ 100mA regulator (VBT18). This (VBT18) is used to power the RF portion, analog
section, core and memory of the Bluetooth sub-system.
PROVISIONAL ISSUE
U200
VRF3
SPI_CSB
SPI_CLK
SPI_MOSI
SPI_MISO
USB_D+
USB_D-
UART2_TX UART_RX
UART2_RX UART_TX
UART2_CTS UART_RTS
UART2_RTS UART_CTS
GPIO12 BT_RST
PIO[4]
PIO[5]
I2S1_CLK0 PCM_CLK
I2S1_TX PCM_IN
I2S1
I2S1_RX PCM_OUT
I2S1_WA0 PCM_SYNC
I2C_SCL
I2C_SDA
VCXO_EN
DIF-D7
(I2S1-WA1)
FSYS
AFC
Figure 4.10: Bluetooth Module
U201
VBT18 VBT18
VBT18
1.8V TX_A
TX_B
RF_IN
AIO[2]
AIO[1]
AIO[0]
PIO[0]
PIO[1]
Bluetooth
PIO[3]
BC313143A PIO[6]
PIO[7]
PIO[8]
PIO[9]
PIO[10]
PIO[11]
XTAL_OUT
XTAL_IN
PIO[2]
VCXO_EN
BT26M
(26MHz)
BT-CLK-REQ
− 4-14 −
BT-Antenna
Bluetooth RF
Balun/
Filter
U304
PMB8611
Vmain
PMIC
VDDPW
SDBB
SDBB
VDDB
1.8v,850mA
SDBB
LBB1
VLBB1
VDDC
1.5v,170mA
VLBB2
LBB2
1.5v,220mA
Vmain
VDDRF VRF1
LRF1
2.85v,250mA
VRF2
LRF2
2.85v,10mA
VRF3
LRF3
2.65v,150mA
RF Sub-System
VRF1
U500
EN
VRF1
EN
PMB6258
VRF2
VCTCXO
AFC
26MHz