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參數(shù)資料
| 型號： | HCS473-SLSQTP |
| 廠商： | Microchip Technology Inc. |
| 英文描述： | Code Hopping Encoder and Transponder |
| 中文描述： | 跳碼編碼器和轉(zhuǎn)發(fā)器 |
| 文件頁數(shù)： | 18/68頁 |
| 文件大?。?/td> | 1629K |
| 代理商： | HCS473-SLSQTP |
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HCS473
DS40035C-page 16
Preliminary
2002 Microchip Technology Inc.
FIGURE 3-6:
ENCODER OPERATION: RF ENABLE/ASK/FSK OPTIONS
3.1.4.9
SEED Button Code (SDBT)
SDBT selects which switch input(s) activate a seed
transmission. Seed transmissions are disabled by
clearing all 4 bits. If a button combination is pressed
that matches the 4-bit SDBT value, a seed code word
is transmitted as configured by the SDTM, SDLM and
SDMD options (see following sections).
The binary bit order is S3-S2-S1-S0. For example, if
you want the combination of S2 and S0 to activate a
seed transmission, use SDBT=0101
2.
SDBT options:
Seed is transmitted when SDBT flags match the
button input flags
SDBT = 0000
2
disables seed capability.
Configuring S3/RFEN as RFEN (see
Section 3.1.4.8) prevents the use of S3 to
trigger a seed transmission.
3.1.4.10
Time Before Seed (SDTM)
The time before seed option selects the delay from
device activation until the seed code words are trans-
mitted. If the delay is not zero, the HCS473 transmits
hopping code words until the selected time, then trans-
mits seed code words.
As code words are always completed, the seed code
word begins the first code word after the specified time.
SDTM options:
0s - seed code words begin immediately
0.8s
1.6s
3.2s
3.1.4.11
Limited Seed (SDLM)
The limited seed option may be used to disable seed
transmission capability after a configurable number of
transmitter activations; limiting a transmitter’s ability to
be learned into a receiver. Specifically, seed transmis-
sions are disabled when the synchronization counter’s
LSB increments from 7Fh to 80h.
SDLM options:
unlimited seed capability
limited seed capability - counter value dependent
3.1.4.12
SEED Mode (SDMD)
The Seed mode option selects between User and Pro-
duction seed modes. Production mode functions as a
special time before seed case (SDTM).
With Production mode enabled, a seed button code
activation triggers MTX hopping code words followed
by MTX seed code words. Production mode functional-
ity is disabled when the synchronization counter’s LSB
increments from 7Fh to 80h.
SDMD options:
User
Production
3.1.4.13
RF Baud Rate Select (RFBSL)
The timing of code word data modulated on the DATA
pin is referred to in multiples of a basic Timing Element
RFT
E
. ‘RF’ T
E
because the DATA pin output is typically
sent through a RF transmitter to the decoder or tran-
sponder reader.
RFT
E
may be selected using the RF Baud Rate Select
(RFBSL) configuration option. RF
TE
accuracy is sub-
ject to the oscillator variation over temperature and
voltage.
RFBSL options:
100
μ
s RFT
E
200
μ
s RFT
E
400
μ
s RFT
E
800
μ
s RFT
E
SWITCH
S3/RFEN
DATA
S3/RFEN
DATA
T
PLL
ASK:
T
PU
Code Word
Code Word
Code Word
Code Word
Code Word
Code Word
Code Word
Code Word
FSK:
Note:
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