HCS320_11 MICROCHIP [Microchip Technology], HCS320_11 Datasheet - Page 5

• Manufacturer Part Number: HCS320_11
• Manufacturer: MICROCHIP [Microchip Technology]

2.0
As shown in the typical application circuits (Figure 2-1),
the HCS320 is a simple device to use. It requires only
the addition of buttons and RF circuitry for use as the
transmitter in your security application. A description of
each pin is described in Table 2-1.
FIGURE 2-1:
© 2011 Microchip Technology Inc.
SHIFT
Note 1: The full 16 function codes are
B3 B2 B1 B0
DEVICE OPERATION
2: Resistor R is recommended for current
B0
B1
+12V
limiting.
implemented using the shift button.
2 button remote control
R
5 button remote control
(2)
S0
S0
S1
S2
SHIFT
S1
S2
SHIFT
TYPICAL CIRCUITS
PWM
PWM
V
V
V
LED
LED
V
SS
DD
DD
SS
+12V
(1)
R
(2)
Tx out
Tx out
TABLE 2-1:
The HCS320 will wake-up upon detecting a button
press and delay approximately 10 ms for button
debounce (Figure 2-2). The synchronization counter,
discrimination value and button information will be
encrypted to form the hopping code. The hopping code
portion will change every transmission, even if the
same button is pushed again. A code word that has
been transmitted will not repeat for more than 64K
transmissions. This provides more than 18 years of use
before a code is repeated; based on 10 operations per
day. Overflow information sent from the encoder can be
used to extend the number of unique transmissions to
more than 192K.
If in the transmit process it is detected that a new but-
ton(s) has been pressed, a RESET will immediately
occur and the current code word will not be completed.
Please note that buttons removed will not have any
effect on the code word unless no buttons remain
pressed; in which case the code word will be completed
and the power-down will occur.
SHIFT
Name
PWM
LED
V
V
S0
S1
S2
DD
SS
Number
Pin
1
2
3
4
5
6
7
8
PIN DESCRIPTIONS
Switch input 0
Switch input 1
Switch input 2/Clock pin when in
Programming mode
Switch input for Shift
Ground reference
Pulse Width Modulation (PWM)
output pin / Data pin for
Programming mode
Cathode connection for LED
Positive supply voltage
Description
HCS320
DS41097D-page 5