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參數(shù)資料
| 型號(hào)： | PT8R1002 |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | CMOS Zero-IF Radio Transceiver IC for Bluetooth |
| 中文描述： | 的CMOS零中頻無線電收發(fā)器IC，藍(lán)牙 |
| 文件頁數(shù)： | 11/26頁 |
| 文件大?。?/td> | 516K |
| 代理商： | PT8R1002 |
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Preliminary Data Sheet
PT8R1002 CMOS Zero-IF
Radio Transceiver IC for Bluetooth
PT0124(12/04)
Ver:2
11
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Receive operation in Bidirectional interface
Unlikely unidirectional interface, the primary procedure for
data reception is to activate internal RXACTIVE signal by
writing
HIGH
to RXA field of BT_RF_PLL_CTRL1 through
DBUS interface. The RF circuitry starts to operate and send
data after fixed time from writing data to the field. Right after
writing
HIGH
to the field, the directional of bus is changed
and PT8R1002 starts to drive TXDATA. Therefore, the
baseband should disable the bus driving before the comple-
tion of register writing in order to prevent bus contention.
Then, the baseband receives data and searches for the access
code. During receive mode, DATACLK is sent from PT8R1002
to baseband as a timing reference. The PT8R1002 circuit sends
the data to baseband at the rising edge of DATACLK, where the
baseband latches the data at the falling edge of DATACLK.
Prior to receiving information over air, the baseband transfers
control information including the hop frequency over the DBUS
interfaces, and enters PT8R1002 into
search access code state
after fixed time to turn on receiver circuitry by writing
HIGH
to
RXA field of BT_RF_PLL_CTRL1. In the
search access code
state
, the baseband performs all of the tasks required to corre-
late with the access code from the receive data. When the
baseband has correlated the access code, then it drives
SYNCDETECT
HIGH
and makes PT8R1002 enter into
receive
payload state
. The bidirectional interface returns to the
idle
state
by the baseband writing LOW to RXA field of
BT_RF_PLL_CTRL1 to turn off RX circuitry after fixed T
.
Right after writing LOW to the field, the directional of bus is
changed and PT8R1002 disable to drive TXDATA. At that time,
the baseband should enable the bus driving after the comple-
tion of register writing in order to prevent bus floating.
Power-up sequence
Figure 12. Receiver procedure timing-diagram in bidirectional interface
DBUS
Programming
SYNCDETECT
TXDATA
DATACLK
HOP CMD
RXACTIVE On CMD
Idle
VCO Tuning
Search
Access Code
Rx-Burst
Idle
Rx-On
t
TuningRX
t
AccessCode
t
RxOn
t
RxOff
Valid Rx Data
Output Direction
In Direction
In Direction
RXACTIVE Off CMD
Rx-
Idle
DATA_CLK(13MHz,O)
DSUB SPI
SYNCDETECT(I)
TXDATA(I/O)
RXACTIVE On
CMD write
PE
SYNC WORD TE
PE : Preamble
TE : Trailer
HEADER+PAYLOAD
t
RxOff
t
RxOn
RXACTIVE Off
CMD write
Figure 13. Receiver signal timing diagram in bidirectional interface
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