CP3BT23 Datasheet, PDF (75/260 Pages) Texas Instruments – CP3BT23 Reprogrammable Connectivity Processor with Bluetooth and Dual CAN Interfaces

15.0 Bluetooth Controller
The integrated hardware Bluetooth Lower Link Controller
(LLC) complies to the Bluetooth Specification Version 1.1
and integrates the following functions:
! 4.5K-byte dedicated Bluetooth data RAM
! 1K-byte dedicated Bluetooth Sequencer RAM
! Support of all Bluetooth 1.1 packet types
! Support for fast frequency hopping of 1600 hops/s
! Access code correlation and slot timing recovery circuit
! Power Management Control Logic
! BlueRF-compatible interface to connect with National’s
LMX5252 and other RF transceiver chips
Figure 15 shows the interface between the CP3BT23 and
the LMX5252 radio chip.
+2.8V
IOVCC
VCC
RFDATA
BBDATA_1
PG1/RFCE
CP3BT23
PG2/BTSEQ1
BXTLEN
LMX5252
BPKTCTL
For a detailed description of the interface to the LMX5252,
consult the LMX5252 data sheet which is available from the
PG3/SCLK
BDCLK
National Semiconductor wireless group. National provides
software libraries for using the Bluetooth LLC. Documenta-
tion for the software libraries is also available from National
Semiconductor.
PG4/SDAT
PG5/SLE
BDDATA
BDEN#
15.1 RF INTERFACE
The CP3BT23 interfaces to the LMX5251 or LMX5252 radio
te ^{chips though the RF interface.}
X1CKI/BBCLK
BRCLK
Figure 14 shows the interface between the CP3BT23 and
the LMX5251 radio chip.
VCC
IOVCC
VDD_DIG_IN
Figure 15. LMX5252 Interface
DS319
The CP3BT23 implements a BlueRF-compatible interface,
which may be used with other RF transceiver chips.
le ^RFDATA
PG0/RFSYNC
CP3BT23
PG1/RFCE
o ^PG3/SCLK
PG4/SDAT
TX_RX_DATA
TX_RX_SYNC
LMX5251
CE
CCB_CLOCK
CCB_DATA
15.1.1 RF Interface Signals
The RF interface signals are grouped as follows:
! Modem Signals (BBCLK, RFDATA, and RFSYNC)
! Control Signal (RFCE)
! Serial Interface Signals (SCLK, SDAT, and SLE)
! Bluetooth Sequencer Status Signals (BTSEQ1,
BTSEQ2, and BTSEQ2)
PG5/SLE
s _X1CKI/BBCLK
CCB_LATCH
BBP_CLOCK
DS220
X1CKI/BBCLK
The X1CKI/BBCLK pin is the input signal for the 12-MHz
clock signal. The radio chip uses this signal internally as the
12× oversampling clock and provides it externally to the
CP3BT23 for use as the Main Clock.
Ob ^{Figure 14. LMX5251 Interface}
RFDATA
The RFDATA signal is the multiplexed Bluetooth data re-
ceive and transmit signal. The data is provided at a bit rate
of 1 Mbit/s with 12× oversampling, synchronized to the 12
MHz BBCLK. The RFDATA signal is a dedicated RF inter-
face pin. This signal is driven to a logic high level after reset.
RFSYNC
In receive mode (data direction from the radio chip to the
CP3BT23), the RFSYNC signal acts as the frequency cor-
rection/DC compensation circuit control output to the radio
chip. The RFSYNC signal is driven low throughout the cor-
relation phase and driven high when synchronization to the
received access code is achieved.
In transmit mode (data direction from the CP3BT23 to the
radio chip), the RFSYNC signal enables the RF output of
the radio chip. When the RFSYNC pin is driven high, the RF
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