mc68hc908qf4 Freescale Semiconductor, Inc, mc68hc908qf4 Datasheet - Page 106

• Manufacturer Part Number: mc68hc908qf4
• Description: M68hc08 Microcontrollers Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

PLL Tuned UHF Transmitter Module
Data Sheet
106
OOK MODULATION
Note: PLL locked, circuit ready to tramsmit in band.
FSK MODULATION
MODE = 0,
MODE = 1,
DATACLK
ENABLE
RFOUT
DATA
STATE 1
Figure 12-4. Signals, Waveforms, and Timing Definitions
State 1
State 2
State 3
State 4
State 5
State 6
Figure 12-4
The circuit is in standby mode and draws only a leakage current from the power
supply.
In this state, the PLL is enabled but out of the lock-in range. Therefore the RF
output stage is switched off preventing any data transmission. Data clock is
available on pin DATACLK. In normal operation, this state is transitional.
In this state, the PLL is within the lock-in range.
The circuit is ready to transmit in band and is waiting for the first data (see
Figure
A rising edge on pin DATA starts the transmission. Data entered on pin DATA
are output on pin RFOUT. The modulation is the one selected through the level
applied on pin MODE.
An out-of-lock condition has been detected. The RF output stage is switched off
preventing any data transmission. Data clock is available on pin DATACLK.
When the supply voltage falls below the shutdown voltage threshold (V
the whole circuit is switched off. Applying a low level on pin ENABLE is the only
condition to get out of this state.
If t < t
If t ≥ t
Freescale Semiconductor, Inc.
For More Information On This Product,
STATE 2
12-4).
t
PLL_Lock_In
PLL_Lock_In
PLL_Lock_In
shows the waveforms of the main signals for a typical application cycle
PLL Tuned UHF Transmitter Module
Go to: www.freescale.com
t
DATACLK_Settling
, then the PLL can still be in acquisition mode.
, then the PLL is locked.
STATE 3
SEE NOTE
f
Carrier
f
Carrier1
f
Carrier2
STATE 4
f
Carrier1
f
Carrier
MC68HC908QF4 — Rev. 1.0
f
Carrier2
STATE 1
MOTOROLA
SDWN
)