HCS410 datasheet(6/36 Pages) MICROCHIP

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HCS410

DS40158E-page 6

Preliminary

 2001 Microchip Technology Inc.

2.1

Pinout Description

The HCS410 has the same footprint as all of the other

devices in the KEELOQ family, except for the two pins

that are reserved for transponder operations and the

LED that is now located at the same position as the S2

switch input.

• S[0:1] – are inputs with Schmitt Trigger detectors

and an internal 60k¾ (nominal) pull-down

resistors.

• S2/LED – uses the same input detection circuit as

S0/S1 but with an added PMOS transistor con-

nected to VDD capable of sourcing enough current

to drive an LED.

• LC[0:1] – is the transponder interface pins to be

connected to an LC circuit for inductive communi-

cation. LC0 is connected to a detector for data

input. Data output is achieved by clamping LC0

and LC1 to GND through two NMOS transistors.

These pins are also connected to a rectifier and a

regulator, providing power to the rest of the logic

and for charging an external power source (Bat-

tery/Capacitor) through VDD.

The input impedance of the LC pins is a function of

input voltage. At low voltages, the input impedance is

in the order of mega-ohms. When laying out a PC

board, care should be taken to ensure that there

is no cross coupling between the LC pins and

other traces on the board. Glitches on the LC lines

will cause the device to reset. A high-value resistor

(220 K

Ω) between LC0 and GND can be added to

reduce sensitivity.

TABLE 2-1:

PINOUT DESCRIPTION

Name

Pin Number

Description

Switch input 0

Switch input 1

S2/LED

Switch input 2/LED output, Clock pin for programming mode

LC1

Transponder interface pin

VSS

Ground reference connection

PWM

Pulse width modulation (PWM)

output pin/Data pin for

programming mode

LC0

Transponder interface pin

VDD

Positive supply voltage connection

TABLE 2-2:

FUNCTION CODES

LC0

Comments

Normal Code Hopping transmission

Delayed seed transmission if allowed by SEED and TMPSD/Normal

Code Hopping transmission

Normal Code Hopping transmission

Immediate seed transmission if allowed by SEED and TMPSD/Normal

Code Hopping transmission

Transponder mode

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