NM95HS01 Datasheet PDF - National Semiconductor
| Part Number | NM95HS01 | |
| Description | (NM95HS01 / NM95HS02) HiSeC-TM High Security Rolling Code Generator | |
| Manufacturers | National Semiconductor | |
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February 1996
NM95HS01 NM95HS02
HiSeCTM High Security Rolling Code Generator
General Description
Features
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
Y High security coding scheme with 248 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
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
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 HiSeCTM-
based RKE System
AN-985
Patents Pending
Y HiSeC Remote Keyless Entry Solution Encoder Decod-
DataSheereCth4ipUS.ectoUmser’s Manual
AN-355
Functional Block Diagram
DataShee
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
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Bit Coding Formats
The NM95HS01 02 HiSeC Generator supports eleven-bit
coding formats which may be used for IR and RF transmis-
sion Seven-bit formats are available for RF applications
and four are available for IR applications One-bit format is
reserved for future use
Bit coding formats are selected by configuring four bits in
the EEPROM array IRSEL PRSEL2 PRSEL1 and PRSEL0
Table II shows the possible bit coding options available
Each bit coding format has a distinction which may be ad-
vantageous for a particular application RF bit coding format
0 is the simplest bit coding scheme and data may be easily
recovered from a transmission by exclusive OR-ing the data
and clock stream Both RF bit coding formats 0 and 2 have
a DC level that is independent of the data
RF format 4 and the IR modes operate with a constant
transmission energy per message and RF coding formats
1 3 5 and 7 are pulse-width modulated (PWM) formats
which are relatively easy to decode RF coding format 7 has
a low duty cycle
The IR bit coding formats are modulated versions of RF
coding format 4 and are all suitable for IR applications The
duty cycle and number of pulses are variable among these
four to allow the user to fine tune the IR circuit power curve
Bit Transmission Coding Formats
RF Bit Coding Format 0 (Manchester Code)
IR bit coding formats all follow the same general pattern In
this mode a logic ‘‘1’’ is always two periods long and a ‘‘0’’
is always three periods long This may be an important con-
sideration when considering preamble and sync timing
Waveform diagrams for all available RF and IR bit transmis-
sion coding formats are shown below
TABLE II Transmission Bit Coding Options
IRSEL PRSEL2 PRSEL1 PRSEL0
Function
0 0 0 0 RF Bit Coding Format 0
0 0 0 1 RF Bit Coding Format 1
0 0 1 0 RF Bit Coding Format 2
0 0 1 1 RF Bit Coding Format 3
0 1 0 0 RF Bit Coding Format 4
0 1 0 1 RF Bit Coding Format 5
01 1 0
Reserved
0 1 1 1 RF Bit Coding Format 7
1 0 0 0 IR Bit Coding Format 1
1 0 0 1 IR Bit Coding Format 2
1 0 1 0 IR Bit Coding Format 3
1 0 1 1 IR Bit Coding Format 4
11 X X
Reserved
RF Bit Coding Format 1 (33% 66% End High)
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RF Bit Coding Format 2 (50% Duty Cycle)
TL D 12302 – 7
RF Bit Coding Format 3 (25% 50% Start High)
DataShee
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RF Bit Coding Format 4 (IR Style)
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RF Bit Coding Format 5 (33% 66% Start High)
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Part DetailsOn this page, you can learn information such as the schematic, equivalent, pinout, replacement, circuit, and manual for NM95HS01 electronic component. |
| Information | Total 20 Pages | |
| Link URL | [ Copy URL to Clipboard ] | |
| Download | [ NM95HS01.PDF Datasheet ] | |
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Featured Datasheets
| Part Number | Description | MFRS |
| NM95HS01 | The function is (NM95HS01 / NM95HS02) HiSeC-TM High Security Rolling Code Generator. National Semiconductor | |
| NM95HS02 | The function is (NM95HS01 / NM95HS02) HiSeC-TM High Security Rolling Code Generator. National Semiconductor | |
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