HCS412T datasheet(4/44 Pages) MICROCHIP

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HCS412

DS41099C-page 4

Preliminary

2.0

DEVICE DESCRIPTION

2.1

Pinout Description

The HCS412’s footprint is identical to other encoders in

the KEELOQ family, except for the two pins reserved for

low frequency communication.

TABLE 2-1:

PINOUT SUMMARY

FIGURE 2-1:

S0/S1 PIN DIAGRAM

FIGURE 2-2:

S2/RFEN/LC1 PIN DIAGRAM

FIGURE 2-3:

LC0 PIN DIAGRAM

Name

Number

Description

Button input pin with Schmitt Trigger detector and internal 60 k

Ω (nominal) pull-down

resistor (Figure 2-1).

Button input pin with Schmitt Trigger detector and internal 60 k

Ω (nominal) pull-down

resistor (Figure 2-1).

S2/RFEN/LC1

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.

LC0

Low frequency (LF) antenna input with automatic gain control for inductive reception and

low frequency output driver for inductive responses (Figure 2-3).

GND

Ground reference.

DATA

Transmission data output driver. Programming input / output data signal (Figure 2-4).

LED

LED output driver (Figure 2-5).

VDD

Positive supply voltage.

60 k

Ω

SWITCH

10V

100

Ω

VBIAS

VDD

SWITCH 2

INPUT

S2LC OPTION

OUTPUT

RFEN

OUT

RECTIFIER AND

REGULATOR

VDD

10V

100

Ω

INPUT

OUTPUT

S2LC OPTION

AMP

DET

AND

LC0

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