MC33492 查看數據表（PDF） - Motorola => Freescale

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MC33492

PLL Tuned UHF Transmitter for Data Transfer Applications

Motorola => Freescale 

Freescale SMeCm33ic49o2nductor, Inc.

STATE MACHINE

Figure 2 details the main state machine.

Figure 2: Main state machine

Power ON

AND ENABLE=0

State 1

Standby mode

ENABLE=0

ENABLE=1

State 2

PLL enabled

but out of lock in range

PLL in

lock in range

ENABLE=0

State 6

Shutdown mode

VBattery < VShutdown

State 4

Transmission mode

PLL out of

PLL in

lock in range lock in range

State 5

PLL out of lock in range

No RF output

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 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.

State 4:

In this state, the PLL is within the lock in range.

If t<tPLL_lock_in then the PLL can still be in acquisition mode.

If t≥tPLL_lock_in then the PLL is locked.

Data entered on pin DATA is output on pin RFOUT.

State 5:

An out-of-lock condition has been detected. The RF output stage is switched off preventing any data

transmission. Data clock is still available on pin DATACLK.

State 6:

When the supply voltage falls below the shutdown voltage threshold (VSDWN), the whole circuit is switched off.

Applying a low level on pin ENABLE is the only condition to get out of this state.

For More Information On This Product,

PLL Tuned UHF TGraonstmo:itwtewr fwor.fDraeteasTcraanles.fceroAmpplications

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