HCS362 datasheet(14/46 Pages) MICROCHIP

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HCS362

DS40189E-page 14

3.4

RF Enable and PLL Interface

The S3/RFEN pin of the HCS362 can be configured to

function as an RF Enable output signal. This is selected

by the RF Enable Output (RFEN) configuration option.

When enabled, this pin will be driven HIGH before data

is transmitted through the DATA pin.

The RF Enable and DATA output are synchronized so

to interface with RF PLL circuits operating in ASK

mode. Figure 3-10 shows the startup sequence. The

RFEN signal will go LOW at the end of the last code

word, including the Guard time.

When the RF Enable output is selected, the S3 pin can

still be used as a button input. The debouncing logic will

be affected though, considerably reducing the respon-

siveness of the button input.

FIGURE 3-10: PLL INTERFACE

Note:

When the RF Enable output feature is used

and a four (or more) buttons input configu-

ration is required, the use of a scheme sim-

ilar

Figure 2-1

(scheme

recommended.

S[3210]

RFEN

DATA

TTD

TRFON

Guard Time

1st CODE WORD

Button Press

Button Release

2nd CODE WORD

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