PT8R1002 Datasheet, PDF (14/26 Pages) List of Unclassifed Manufacturers – CMOS Zero-IF Radio Transceiver IC for Bluetooth

Preliminary Data Sheet
PT8R1002 CMOS Zero-IF
Radio Transceiver IC for Bluetooth
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Power control
In the PT8R1002, there are five different states with different
current consumption; Sleep, Idle, VCO active, TX active, and
RX active. Upon reset, the PT8R1002 stays in the Idle state to
wait for the command through serial programming interface
from the baseband controller. In the Idle state, there is DATACLK
from the radio to the baseband controller. In the Idle mode, all
RF circuits are shut down to reduce the static current con-
sumption. Only the reference clock oscillator and DATACLK
pump to the baseband is active. After HOP set command through
the serial programming, the VCO will operate to lock the pro-
grammed channel frequency. Owing to the signal such as
RXACTIVE or TXACTIVE, the PT8R1002 will enter into the
active state such as TX active state and RX active state. In
those state, all RF circuits and GFSK modem will operate and
result in the maximum current consumption. In the unidirec-
tional mode, the falling signal of RXACTIVE or TXACTIVE
will make the PT8R1002 into Idle state automatically. In the
bidirectional mode, the explicit command to stop receive or
transmission through serial programming will make the
PT8R1002 into Idle state. The PT8R1002 enters into Sleep
state by power down command through serial programming.
Sleep state is the least power consumption among other states
and all clocks include reference oscillator will stop the opera-
tion as well as the power down of all RF circuits. In Sleep state,
only the serial programming interface logic can operate which
uses clock from external device. However, the value of all
registers will sustain until the wake up from Sleep state. Fol-
lowing figure shows the state transition in terms of power con-
trol.
Figure 16. State transition diagram for power control
RX active state
(I_RX)
TX active state
(I_TX)
Receive command
RXACTIVE off
Transmit command
VCO active state
(I_VCO)
TXACTIVE off
HOP command
Idle state
(I_Idle)
Power-Down command
Power-Up command
Sleep state
(I_Sleep)
PT0124(12/04)
14
Ver:2