HCS412/P Microchip Technology, HCS412/P Datasheet

HCS412/P

Manufacturer Part Number

HCS412/P

Description

IC CODE HOP ENCODR/TRNSPOND 8DIP

Manufacturer

Microchip Technology

Type

Code Hopping Encoder and Transponderr

Datasheets

1.HCS412-IP.pdf (44 pages)

2.HCS412-IP.pdf (3 pages)

Specifications of HCS412/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

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1.0

The HCS412 (silicon revision B0) conforms to the

device datasheet (DS41099A) with the exceptions

described below.

1.1

Information contained in this publication regarding device applications and the like is intended for suggestion only and

may be superseded by update. No representation or warranty is given and no liability is assumed by Microchip Technol-

ogy Incorporated with respect to the accuracy or use of such information, or infringement of patents or other intellectual

property rights arising from such use or otherwise. Use of Microchip’s products as critical components in life support

systems is not authorized except with express written approval by Microchip. No licenses are conveyed, implicitly or oth-

erwise, under any intellectual property rights. The Microchip logo and name are registered trademarks of Microchip

property of their respective companies.

 2000 Microchip Technology Inc.

This errata sheet applies only when the HCS412

is used in TRANSPONDER mode, i.e. when

configuration option S2LC is configured such

that pin LC1 will be used as a transponder inter-

face pin.

On revision B0 silicon the bias voltage on LC1

may be sufficiently large to cause unintended

turning on of the device and consequential drain

of the battery.

ERRATA

Transponder Mode

HCS412 Silicon Revision B0 Errata Sheet

Preliminary

Therefore to ensure reliable device operation

when used as a transponder, a 4.7 MΩ 10%

resistor must be connected between pin 3 (LC1)

and pin 5 (Ground). The resistor ensures suffi-

cient loading of the internal biasing circuitry to

cause a sufficient reduction in the LC1 bias volt-

age.

Designers intending transponder operation

should carefully measure LC input voltages to

the LC0/LC1 pins since use of revision B0

devices without the resistor may lead to

extremely high sensitivity which may cause

unrealistic expectations regarding transponder

operating range due to sensitivity as described

above.

HCS412

DS80071A - page 1

Related parts for HCS412/P

HCS412/P Summary of contents

Page 1

... The Microchip logo and name are registered trademarks of Microchip Technology Inc. in the U.S.A. and other countries. All rights reserved. All other trademarks mentioned herein are the property of their respective companies.  2000 Microchip Technology Inc. HCS412 3. ...

Page 2

... Serialized Quick Turn Programming (SQTP service mark of Microchip Technology Incorporated in the U.S.A. All other trademarks mentioned herein are property of their respective companies. © 2002, Microchip Technology Incorporated, Printed in the U.S.A., All Rights Reserved. Printed on recycled paper. Microchip received QS-9000 quality system ...

Page 3

... Korea Microchip Technology Korea 168-1, Youngbo Bldg. 3 Floor Samsung-Dong, Kangnam-Ku Seoul, Korea 135-882 Tel: 82-2-554-7200 Fax: 82-2-558-5934 Singapore Microchip Technology Singapore Pte Ltd. 200 Middle Road #07-02 Prime Centre Singapore, 188980 Tel: 65-334-8870 Fax: 65-334-8850 Taiwan Microchip Technology Taiwan 11F-3, No. 207 ...

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