參數(shù)資料
型號: HCS412TSN
廠商: Microchip Technology Inc.
英文描述: KEELOQ Code Hopping Encoder and Transponder
中文描述: 而Keeloq跳碼編碼器和轉(zhuǎn)發(fā)器
文件頁數(shù): 16/44頁
文件大小: 704K
代理商: HCS412TSN
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 (T
DSD
) 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
T
LEDON
T
TD
AFSK = 1 (FSK)
AFSK = 0 (ASK)
QLVS = 1, RFEN = 1
S0, S1
1200 ms
50 ms
50
ms
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