參數(shù)資料
型號(hào)： HCS412IP
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)： 7/44頁
文件大?。?/td> 704K
代理商： HCS412IP
2002 Microchip Technology Inc.
Preliminary
DS41099C-page 7
HCS412
TABLE 2-2:
OSCILLATOR CALIBRATION
VALUE (OSCT)
FIGURE 2-7:
HCS412 NORMALIZED RF
TE
VERSUS TEMP
2.2.6
LOW VOLTAGE DETECTOR
The HCS412
’s battery voltage detector detects when
the supply voltage drops below a predetermined value.
The value is selected by the Low Voltage Trip Point
Select (VLOWSEL) configuration option.
The low voltage detector result is included in encoder
transmissions (VLOW) allowing the receiver to indicate
when the transmitter battery is low (Figure 3-2).
The HCS412 indicates a low battery condition by
changing the LED operation (Figure 3-9).
FIGURE 2-8:
TYPICAL VOLTAGE TRIP
POINTS
TABLE 2-3:
VLOWSEL OPTIONS
TABLE 2-4:
VLOW STATUS BIT
2.2.7
THE S2/RFEN/LC1 PIN
The S2/RFEN/LC1 pin may be used as a button input,
RF enable output or as an interface to the LF antenna.
Select between LC1 antenna interface and S2/RFEN
functionality with the button/transponder select (S2LC)
configuration option (Table 2-2).
2.2.7.1
S2 BUTTON INPUT CONSIDERATIONS
The S2/RFEN/LC1 pin defaults to LF antenna output
LC1 when the HCS412 is first connected to the supply
voltage (i.e., battery replacement).
The configuration register controlling the pin’s function
is loaded on the first device activation after battery
replacement. A desired S2 input state is therefore
enabled only after the first activation of either S0, S1 or
LC0. The transponder bias circuitry switches off and
the internal pull-down resistor is enabled when the S2/
RFEN/LC1 pin reaches button input configuration.
There will be an extra delay the first activation after
connecting to the supply voltage while the HCS412
retrieves the configuration word and configures the
pins accordingly.
OSCT3:0
Description
0111b
+
Slowest Oscillator Setting (long T
E
)
:
:
Slower (longer T
E
)
:
Nominal Setting
:
Faster (shorter T
E
)
:
:
Fastest Oscillator Setting (short T
E
)
0011b
0010b
0001b
0000b
1111b
1110b
1101b
-
1000b
0.94
1.10
1.08
1.06
1.04
1.02
1.00
0.98
0.96
0.92
0.90
RF
TE
RF
TE
V
DD
LEGEND
= 2.0V
= 3.0V
= 6.0V
NORMALIZED
RF
TE
Temperature °C
-50 -40 -30 -20 -10 0
10 20 30 40 50 60 70 80 90
Note:
Values are for calibrated oscillator.
VLOWSEL
Nominal
Trip
Point
Description
0
1
2.2V
4.4V
for 3V battery applications
for 6V battery applications
VLOW
Description
0
1
V
DD
is above selected trip voltage
V
DD
is below selected trip voltage
V
LOW
Volts (V)
-40
Nominal V
LOW
trip point
0
50
85
2.0
1.8
1.6
2.2
2.4
2.6
Temp (°C)
V
LOW
sel = 0
4.4
4.2
4.0
3.8
4.6
4.8
5.0
V
LOW
sel = 1
2.8
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