hcs362 Microchip Technology Inc., hcs362 Datasheet - Page 12

• Manufacturer Part Number: hcs362
• Description: Keeloq Code Hopping Encoder
• Manufacturer: Microchip Technology Inc.

HCS362
3.1.4
MTX[0..1]
number of code words that will be transmitted. If the
button is released after 1.6 s (or greater) and MTX code
words have been transmitted, the code word being
transmitted will be terminated. The possible values are:
00
01
10
11
FIGURE 3-6:
3.2
The LED pin will be driven LOW periodically while the
HCS362 is transmitting data, in order to switch on an
external LED.
The duty cycle (T
between two possible values by the configuration
option (LED).
FIGURE 3-7:
The same configuration option determines whether
when the V
trip point, the LED will blink only once or stop blinking.
DS40189D-page 12
V
V
DD
S[3210]
S[3210]
DD
LED
LED
- 1
- 2
- 4
- 8
DATA
> V
Time
< V
LOW
LOW
LED Output
DD
MINIMUM CODE WORDS
T
LEDON
configuration bits selects the minimum
T
Voltage drops below the selected V
0 s
TD
T
LEDON
TIME BITS OPERATION
LED OPERATION (LED = 1)
Time bits =
LEDON
= 25 ms
= One Code Word
T
/T
LEDOFF
LEDOFF
00
T
LEDOFF
) can be selected
= 500 ms
0.8 s
Time bits set internally to
Time bits actually output
LOW
Preliminary
3.1.5
The time bits indicate the duration that the inputs were
activated:
The TIME bits are incremented every 0.8 s and does
not wrap once it reaches ‘
Time information is alternative to the CRC bits availabil-
ity and is selected by the
FIGURE 3-8:
V
V
S[3210]
Note:
DD
LED
DD
LED
00
01
10
11
> V
01
< V
- immediate
- after 0.8 s
- after 1.6 s
- after 2.4 s
LOW
LOW
When the HCS362 encoder is used as
a Dual Encoder the LED pin is used as
a SHIFT input (Figure 2-2). In such a
configuration the LED is always ON
during transmission. To keep power
consumption low, it is recommended
to use a series resistor of relatively
high value. V
available when using the second
Encryption Key.
1.6 s
TIME BITS
Time bits set internally to
T
T
Time bits actually output
LEDON
LEDON
LED OPERATION (LED = 0)
= 200 ms
T
CTSEL
11
LOW
2002 Microchip Technology Inc.
LEDOFF
’.
information is not
T
configuration bit.
LEDOFF
10
2.4 s
= 800 ms