hcs412 Microchip Technology Inc., hcs412 Datasheet - Page 4

• Manufacturer Part Number: hcs412
• Description: Keeloq? Code Hopping Encoder And Transponder
• Manufacturer: Microchip Technology Inc.

HCS412
2.0
2.1
The HCS412’s footprint is identical to other encoders in
the K
low frequency communication.
TABLE 2-1:
FIGURE 2-1:
FIGURE 2-2:
DS41099C-page 4
S2/RFEN/LC1
S0
S1
Name
100
10V
EE
DATA
GND
LED
LC0
V
Pin
S0
S1
DD
L
OQ
VBIAS
DEVICE DESCRIPTION
Pinout Description
family, except for the two pins reserved for
60 k
Number
PINOUT SUMMARY
S0/S1 PIN DIAGRAM
S2/RFEN/LC1 PIN DIAGRAM
Pin
1
2
3
4
5
6
7
8
V
DD
Button input pin with Schmitt Trigger detector and internal 60 k (nominal) pull-down
resistor (Figure 2-1).
Button input pin with Schmitt Trigger detector and internal 60 k (nominal) pull-down
resistor (Figure 2-1).
Multi-purpose input / output pin (Figure 2-2).
• Button input pin with Schmitt Trigger detector and internal pull-down resistor.
• RFEN output driver.
• LC1 low frequency (LF) antenna output driver for inductive responses and LC bias.
• Programming clock signal input.
Low frequency (LF) antenna input with automatic gain control for inductive reception and
low frequency output driver for inductive responses (Figure 2-3).
Ground reference.
Transmission data output driver. Programming input / output data signal (Figure 2-4).
LED output driver (Figure 2-5).
Positive supply voltage.
S2LC OPTION
>
<
>
SWITCH
SWITCH 2
LC
OUTPUT
INPUT
IN
RFEN
OUT
>
Preliminary
FIGURE 2-3:
LC0
Description
100
10V
RECTIFIER AND
LC0 PIN DIAGRAM
REGULATOR
2002 Microchip Technology Inc.
AMP
AND
DET
S2LC OPTION
<
LC
OUTPUT
V
DD
>
LC
INPUT