NM95HS01 Datasheet, PDF (1/20 Pages) National Semiconductor (TI) – HiSeC-TM High Security Rolling Code Generator

February 1996
NM95HS01 NM95HS02
HiSeC^TM High Security Rolling Code Generator
General Description
The NM95HS01 02 HiSeC Rolling Code Generator is a
small footprint monolithic CMOS device designed to pro-
vide a complete low-cost high security solution to the prob-
lem of generating encrypted signals for remote keyless en-
try (RKE) applications
The NM95HS01 02 generates a fully encoded bit stream
each time one of (up to) 4 switch inputs is activated The
patented coding scheme utilizes 2⁴⁸ possible user-pro-
grammable coding combinations and features high linear
complexity and correlation immunity High security is guar-
anteed by generating a unique (rolling) code for each trans-
mission and can be further enhanced by creating custom-
ized algorithms for individual customers With this product
each key can be designed to be both unique and highly
secure
The NM95HS01 02 supports either an IR or RF signal
transmitter and can be clocked with either an RC clock
(NM95HS01) or a crystal oscillator (NM95HS02) The de-
vice operates over a voltage range of 2 2V to 6 5V and
offers a low power standby mode (^k1 mA) for battery appli-
cations The product is available in both 8-pin and 14-pin SO
packages with 2 or 4 key switch inputs that can be used for
customer presets such as seat positions and vehicle oper-
ating functions such as car door locking unlocking
Patents Pending
Features
Y _{High security coding scheme with 2}48 _combinations
Y _{High linear complexity and correlation immunity}
Y _{2 2V to 6 5V operation}
Y _{Less than 1 mA standby current}
Y _{Full resynchronization capability}
Y _{Unique customized algorithm option}
Y _{13 bytes on-chip non-volatile configuration memory}
Y _{RC or XTAL clock options for to 4 1 MHz operation}
Y _{Supports both IR and RF signal transmission}
Y _{Selection of bit coding and transmission frame formats}
Y _{Space saving narrow body SO8 or SO14 packages}
Y _{Up to 4 key switch inputs on SO14 package}
Applications
Y _{Remote Keyless Entry (RKE) applications}
Y _{Burglar alarms garage door openers}
Y _{Individualized recognition transmission systems}
Y _{Personalized consumer automotive applications}
Relevant Documents
Y _{MM57HS01 datasheet}
Y _{Designing and Programming a Complete HiSeC}TM_-
based RKE System
AN-985
Y _{HiSeC Remote Keyless Entry Solution Encoder Decod-}
er Chip Set User’s Manual
AN-355
Functional Block Diagram
Note Signals shown are internal logic signals
FIGURE 1
HiSeCTM and MICROWIRETM are trademarks of National Semiconductor Corporation
C1996 National Semiconductor Corporation TL D 12302
RRD-B30M66 Printed in U S A
TL D 12302 – 1