MC33493MOD315 Freescale Semiconductor, MC33493MOD315 Datasheet - Page 6

• Manufacturer Part Number: MC33493MOD315
• Description: BOARD EVALUATION FOR MC33493 TX
• Manufacturer: Freescale Semiconductor
• Type: Transmitterr

Specifications of MC33493MOD315

• Contents: Module and Misc Hardware
• For Use With/related Products: MC33493 315 MHz RF Module
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

State Machine
6
Figure 3
State 1: The circuit is in standby mode and draws only a leakage current from the power supply.
State 2: In this state, the PLL is out of the lock-in range; therefore, the RF output stage is switched off, preventing RF
transmission. Data clock is available on the DATACLK pin. Each time the device is enabled, the state machine passes through
this state.
State 3: In this state, the PLL is within the lock-in range. If t < t
then the PLL is locked. Data entered on the DATA pin are output on the RFOUT pin according to the modulation selected by
the level applied on the MODE pin.
State 4: When the supply voltage falls below the shutdown voltage threshold (V
shutdown, applying a low level on the ENABLE pin unlatches the circuit.
Figure 4
6
details the state machine.
shows the waveforms of the main signals for a typical application cycle.
State Machine
ENABLE=0
PLL Tuned UHF Transmitter for Data Transfer Applications, Rev. 1.7
lock-in range
PLL in
PLL out of lock-in range
Transmission mode
AND ENABLE=0
Standby mode
No RF output
ENABLE=1
Power ON
State 1
State 2
State 3
Figure 3. State machine
lock-in range
PLL out of
PLL_lock_in
, the PLL may be in acquisition mode. If t≥t
SDWN
Shutdown mode
V
battery
ENABLE=0
State 4
,) the entire circuit switches off. After this
< V
shutdown
Freescale Semiconductor
PLL_lock_in
,