HCS300-I/P Microchip Technology, HCS300-I/P Datasheet - Page 5

• Manufacturer Part Number: HCS300-I/P
• Description: IC,Remote-Control Transmitter/Encoder,CMOS,DIP,8PIN
• Manufacturer: Microchip Technology
• Type: Code Hopping Encoderr

Specifications of HCS300-I/P

• Applications: Remote Secure Access, Keyless Entry
• Mounting Type: Through Hole
• Package / Case: 8-DIP (0.300", 7.62mm)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

2.0
As shown in the typical application circuits (Figure 2-1),
the HCS300 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 given in Table 2-1.
FIGURE 2-1:
TABLE 2-1:
Name
PWM
2001 Microchip Technology Inc.
LED
V
V
S0
S1
S2
S3
B4 B3 B2 B1 B0
DD
SS
Note:
B0
B1
V
ENCODER OPERATION
DD
Number
Pin
Up to 15 functions can be implemented
by pressing more than one button
simultaneously or by using a suitable
diode array.
1
2
3
4
5
6
7
8
5 button remote control (Note)
2 button remote control
PIN DESCRIPTIONS
S0
S1
S2
S3
Switch input 0
Switch input 1
Switch input 2 / Clock pin when in
Programming mode
Switch input 3
Ground reference
Pulse Width Modulation (PWM)
output pin / Data pin for
Programming mode
Cathode connection for LED
Positive supply voltage
S0
S1
S2
S3
TYPICAL CIRCUITS
PWM
LED
V
Vss
DD
PWM
Vss
V
LED
Description
DD
V
DD
Tx out
Tx out
The HCS300 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.
FIGURE 2-2:
Yes
RESET and Debounce Delay
Load Transmit Register
(A button has been pressed)
Word Transmission
Update Sync Info
Complete Code
Sample Inputs
Encrypt With
ENCODER OPERATION
Power-Up
Crypt Key
Released
Transmit
Buttons
(10 ms)
Buttons
Added
Stop
All
?
?
Yes
No
HCS300
DS21137F-page 5
No