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HCS412SN Datasheet(PDF) 16 Page - Microchip Technology

Part # HCS412SN
Description  KEELOQ Code Hopping Encoder and Transponder
PDF  44 Pages
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Manufacturer  MICROCHIP [Microchip Technology]
Direct Link  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

HCS412SN Datasheet(HTML) 16 Page - Microchip Technology

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HCS412
DS41099C-page 16
Preliminary
© 2002 Microchip Technology Inc.
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
50 ms



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