HCS412 datasheet(16/44 Pages) MICROCHIP

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HCS412

DS41099C-page 16

Preliminary

3.4.8

QLVS FEATURES

Setting the HCS412’s special QLVS (‘Quick Secure

Learning’) configuration option enables the following

options:

• Reduces the time (TDSD) before a delayed seed

transmission begins.

• Disables DATA modulation when the LED pin is

driven low (Figure 3-11).

- If the PLL Interface option is set to ASK, the

DATA pin will go low while the LED pin is low.

- If the PLL Interface option is set to FSK, the

DATA pin will go high and the RFEN output

will go low while the LED pin is low. If the bat-

tery is low, the HCS412 transmits only until

the LED goes on.

• If the Temporary Seed (TMPSD) option is

enabled, seed transmission capability can be dis-

abled by applying the button sequence shown in

Figure 3-12

FIGURE 3-11: LED, DATA, RFEN INTERACTION WHEN QLVS IS SET

FIGURE 3-12: SEED DISABLE WAVEFORM

SWITCH

LED

DATA

S2/RFEN/LC1

DATA

S2/RFEN/LC1

TLEDON

TTD

AFSK = 1 (FSK)

AFSK = 0 (ASK)

QLVS = 1, RFEN = 1

S0, S1

1200 ms

50 ms

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