HCS412I MICROCHIP [Microchip Technology], HCS412I Datasheet - Page 16

• Manufacturer Part Number: HCS412I
• Description: KEELOQ Code Hopping Encoder and Transponder
• Manufacturer: MICROCHIP [Microchip Technology]

HCS412
3.4.8
Setting the HCS412’s special QLVS (‘Quick Secure
Learning’) configuration option enables the following
options:
• Reduces the time (T
• Disables DATA modulation when the LED pin is
• If the Temporary Seed (TMPSD) option is
FIGURE 3-11: LED, DATA, RFEN INTERACTION WHEN QLVS IS SET
FIGURE 3-12: SEED DISABLE WAVEFORM
DS41099C-page 16
QLVS = 1, RFEN = 1
AFSK = 0 (ASK)
AFSK = 1 (FSK)
transmission begins.
driven low (Figure 3-11).
- If the PLL Interface option is set to ASK, the
- If the PLL Interface option is set to FSK, the
enabled, seed transmission capability can be dis-
abled by applying the button sequence shown in
Figure 3-12
DATA pin will go low while the LED pin is low.
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.
QLVS FEATURES
S2/RFEN/LC1
S2/RFEN/LC1
SWITCH
DATA
DATA
LED
S0, S1
DSD
) before a delayed seed
50 ms
T
TD
T
LEDON
50 ms
Preliminary
1200 ms
2002 Microchip Technology Inc.