MC68HC908RF2 Datasheet, PDF (228/254 Pages) Motorola, Inc – HCMOS Microcontroller Unit

PLL Tuned UHF Transmitter Module
ENABLE
DATACLK
t_{DATACLK_Settling}
t_{PLL_Lock_In}
SEE NOTE
DATA
MODE = 0,
OOK MODULATION
RFOUT
MODE = 1,
FSK MODULATION
STATE 1
STATE 2
STATE 3
Note: PLL locked, circuit ready to tramsmit in band.
f_Carrier
f_Carrier
f_Carrier1
f_Carrier2
f_Carrier1
STATE 4
f_Carrier2
STATE 1
Figure 16-3. Signals, Waveforms, and Timing Definitions
16.9 Power Management
NOTE:
When the battery voltage falls below the shutdown voltage threshold
(V_SDWN) the whole circuit is switched off.
After this shutdown, the circuit is latched until a low level is applied on
pin ENABLE (see state 6 under 16.8 State Machine).
16.10 Data Clock
When the data clock starts, the high-to-low ratio may be uneven.
Similarly the clock is switched off asynchronously so the last period
length is not guaranteed.
Advance Information
228
PLL Tuned UHF Transmitter Module
MC68HC908RF2 — Rev. 1
MOTOROLA