HCS320-I/SN Microchip Technology, HCS320-I/SN Datasheet - Page 5

• Manufacturer Part Number: HCS320-I/SN
• Description: IC CODE HOPP ENCODR 16FUNC 8SOIC
• Manufacturer: Microchip Technology
• Type: Code Hopping Encoderr

Specifications of HCS320-I/SN

• Applications: Remote Secure Access, Keyless Entry
• Mounting Type: Surface Mount
• Package / Case: 8-SOIC (3.9mm Width)
• Ic Function: Encoder IC
• Supply Voltage Range: 3.5V To 13V
• Operating Temperature Range: -40°C To +85°C
• Digital Ic Case Style: SOIC
• No. Of Pins: 8
• Peak Reflow Compatible (260 C): Yes
• Termination Type: SMD
• Rohs Compliant: Yes
• Filter Terminals: SMD
• Leaded Process Compatible: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

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:
SHIFT
2001 Microchip Technology Inc.
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
SS
DD
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
Ground reference
Pulse Width Modulation (PWM)
output pin / Data pin for
Programming mode
Cathode connection for LED
Positive supply voltage
Switch input for Shift
Description
HCS320
DS41097C-page 5