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HCS361-SN の電気的特性と機能

HCS361-SNのメーカーはMicrochip Technologyです、この部品の機能は「KEELOQ CODE HOPPING ENCODER」です。


製品の詳細 ( Datasheet PDF )

部品番号 HCS361-SN
部品説明 KEELOQ CODE HOPPING ENCODER
メーカ Microchip Technology
ロゴ Microchip Technology ロゴ 




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HCS361-SN Datasheet, HCS361-SN PDF,ピン配置, 機能
M
HCS361
Code Hopping Encoder*
FEATURES
Security
• Programmable 28/32-bit serial number
• Programmable 64-bit encryption key
• Each transmission is unique
• 67-bit transmission code length
• 32-bit hopping code
• 35-bit fixed code (28/32-bit serial number,
4/0-bit function code, 1-bit status, 2-bit CRC)
• Encryption keys are read protected
Operating
• 2.0-6.6V operation
• Four button inputs
- 15 functions available
• Selectable baud rate
• Automatic code word completion
• Battery low signal transmitted to receiver
• Nonvolatile synchronization data
• PWM and VPWM modulation
Other
• Easy to use programming interface
• On-chip EEPROM
• On-chip oscillator and timing components
• Button inputs have internal pulldown resistors
• Current limiting on LED output
• Minimum component count
Enhanced Features Over HCS300
• 48-bit seed vs. 32-bit seed
• 2-bit CRC for error detection
• 28/32-bit serial number select
• Two seed transmission methods
• PWM and VPWM modulation
• Wake-up signal in VPWM mode
• IR modulation mode
Typical Applications
The HCS361 is ideal for Remote Keyless Entry (RKE)
applications. These applications include:
• Automotive RKE systems
• Automotive alarm systems
• Automotive immobilizers
• Gate and garage door openers
• Identity tokens
• Burglar alarm systems
PACKAGE TYPES
PDIP, SOIC
S0
1
S1 2
S2 3
S3 4
8 VDD
7 LED
6 PWM
5 VSS
HCS361 BLOCK DIAGRAM
Oscillator
LED
Reset circuit
LED driver
Controller
Power
latching
and
switching
PWM
EEPROM
Encoder
32-bit shift register
VSS
VDD
Button input port
S3 S2 S1 S0
DESCRIPTION
The HCS361 is a code hopping encoder designed for
secure Remote Keyless Entry (RKE) systems. The
HCS361 utilizes the KEELOQ code hopping technology,
which incorporates high security, a small package
outline and low cost, to make this device a perfect
solution for unidirectional remote keyless entry systems
and access control systems.
The HCS361 combines a 32-bit hopping code
generated by a nonlinear encryption algorithm, with a
28/32-bit serial number and 7/3 status bits to create a
67-bit transmission stream. The length of the
transmission eliminates the threat of code scanning
and the code hopping mechanism makes each
transmission unique, thus rendering code capture and
resend (code grabbing) schemes useless.
KEELOQ is a trademark of Microchip Technology Inc.
*Code hopping encoder patents issued in Europe, U. S. A., R. S. A. — US: 5,517,187; Europe: 0459781
© 1996 Microchip Technology Inc.
Preliminary
DS40146C-page 1

1 Page





HCS361-SN pdf, ピン配列
HCS361
Before a transmitter can be used with a particular
receiver, the transmitter must be ‘learned’ by the
receiver. Upon learning a transmitter, information is
stored by the receiver so that it may track the
transmitter, including the serial number of the
transmitter, the current synchronization value for that
transmitter and the same encryption key that is used on
the transmitter. If a receiver receives a message of valid
format, the serial number is checked and, if it is from a
learned transmitter, the message is decrypted and the
decrypted synchronization counter is checked against
what is stored. If the synchronization value is verified,
then the button status is checked to see what operation
is needed. Figure 1-3 shows the relationship between
some of the values stored by the receiver and the val-
ues received from the transmitter.
FIGURE 1-1: CREATION AND STORAGE OF ENCRYPTION KEY DURING PRODUCTION
Transmitter
Serial Number or
Seed
Manufacturer’s
Code
Key
Generation
Algorithm
Encryption
Key
HCS361 EEPROM Array
Serial Number
Encryption Key
Sync Counter
.
.
.
FIGURE 1-2: BASIC OPERATION OF TRANSMITTER (ENCODER)
Transmitted Information
EEPROM Array
Decryption Key
Sync Counter
Serial Number
KEELOQ
Encryption
Algorithm
32 Bits of
Encrypted Data
Serial Number
Button Press
Information
FIGURE 1-3: BASIC OPERATION OF RECEIVER (DECODER)
EEPROM Array
Decryption Key
Sync Counter
Serial Number
Manufacturer Code
Check for
Match
KEELOQ
Decryption
Algorithm
Check for
Match
Decrypted
Synchronization
Counter
Button Press
Information
Serial Number
32 Bits of
Encrypted Data
Received Information
© 1996 Microchip Technology Inc.
Preliminary
DS40146C-page 3


3Pages


HCS361-SN 電子部品, 半導体
HCS361
3.2 SYNC_A, SYNC_B
(Synchronization Counter)
This is the 16-bit synchronization value that is used to
create the hopping code for transmission. This value
will be changed after every transmission. A second syn-
chronization value can be used to stay synchronized
with a second receiver.
3.3 SEED_0, SEED_1, and SEED_2
(Seed Word)
This is the three word (48 bits) seed code that will be
transmitted when seed transmission is selected. This
allows the system designer to implement the secure
learn feature or use this fixed code word as part of a dif-
ferent key generation/tracking process or purely as a
fixed code transmission.
3.4 SER_0, SER_1 (Encoder Serial
Number)
SER_0 and SER_1 are the lower and upper words of
the device serial number, respectively. There are 32 bits
allocated for the serial number and a selectable config-
uration bit determines whether 32 or 28 bits will be
transmitted. The serial number is meant to be unique
for every transmitter.
3.5 CONFIG (Configuration Word)
The configuration word is a 16-bit word stored in
EEPROM array that is used by the device to store
information used during the encryption process, as well
as the status of option configurations. Further
explanations of each of the bits are described in the
following sections.
TABLE 3-2 CONFIGURATION WORD
Bit Number
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
Symbol
BACW
FAST
TXWAK
SPM
SEED
DELM
TIMO
IND
USRA0
USRA1
USRB0
USRB1
XSER
TMPSD
VPWM
OVR
Bit Description
Blank Alternate Code Word
Baud Rate Selection
PWM mode: 1/6, 2/6 or 1/3,
2/3 select
VPWM mode: Wakeup
enable
Sync Pulse Modulation
Seed Transmission enable
Delay mode enable
Time out enable
Independent mode enable
User bit
User bit
User bit
User bit
Extended serial number
enable
Temporary seed transmis-
sion enable
VPWM select
Overflow bit
3.5.1 BACW: BLANK ALTERNATE CODE WORD
BACW = 1 selects the encoder to transmit every sec-
ond code word. This can be used to reduce the average
power transmitted over a 100ms window and thereby
transmit a higher peak power.
3.5.2 FAST: SELECT FAST TRANSMISSION
FAST selects the baud rate. If FAST = 1, the baud rate
is nominally 1667 bits per second and with FAST = 0,
833 bits per second.
3.5.3 TXWAK: BIT FORMAT SELECT OR
WAKEUP
In PWM mode, this bit selects the bit format. If TXWAK
= 1, the PWM pulse is 1/6;2/6 and for TXWAK = 0, 1/
3;2/3 (Figure 4-1, VPWM = 0).
In VPWM mode, this bit enables the wake-up signal.
With TXWAK = 1, transmission of the wake-up and
dead time sequence is enabled (Figure 4-2, VPWM =
1). Wakeup is transmitted before the first code word of
each transmission only. For TXWAK = 0, the transmis-
sion will skip wake-up and start transmitting the pream-
ble portion of the code word (Figure 4-2, VPWM = 1).
3.5.4 SPM: SYNC PULSE MODULATION
Select modulation mode of Sync Pulse. If SPM = 1, the
sync pulse is modulated (Figure 4-1 and Figure 4-2).
DS40146C-page 6
Preliminary
© 1996 Microchip Technology Inc.

6 Page



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部品番号部品説明メーカ
HCS361-SN

KEELOQ CODE HOPPING ENCODER

Microchip Technology
Microchip Technology


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