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PCF7946 Datasheet(PDF) 1 Page - NXP Semiconductors

Part No. PCF7946
Description  Security Transponder plus Remote Keyless Entry
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Maker  PHILIPS [NXP Semiconductors]
Homepage  http://www.nxp.com
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PCF7946 Datasheet(HTML) 1 Page - NXP Semiconductors

   
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Philips Semiconductors
Product Profile
PCF7946AT
June 1999
Security Transponder plus Remote Keyless Entry, HITAG2
PLUS
Features
• Compatible with Security Transponder, PCF7936AS.
• Rolling Code Generator for keyless entry
• 14-pin SO package
Transponder
• 64/32 bit mutual authentication
• 32 bit unique device identification number
• Fast authentication, 39ms
• 48 bit Secret Key
• 128 bit user memory (EEPROM)
• EEPROM read/write in cipher mode
• EEPROM read/write protection capability
• Excellent sensitivity in read and write mode
Code Hopping Generator
• Four user buttons (15 + 1 commands)
• LED acknowledgment of transmission
• 42 bit unidirectional code hopping
• 48 bit Remote Secret Key
• 114 bit message with run-in, device identification,
function code, terminator and parity bits
• Automatic code synchronisation via transponder
• Programmable data rate and frame repetition rate
• Clock input to support external data rate reference
• Manchester encoding
Low tolerance on-chip RC oscillator (< ±10%)
• Battery low indication
• Single cell operation (2.0V to 3.6V)
• Low power consumption
(ACTIVE: 0.3 mA, POWER DOWN: 300 nA)
General Description
The HITAG2
PLUS is a high performance monolithic
Security Transponder and Remote Keyless Entry Chip
ideally suited for car immobiliser applications that
incorporate keyless entry functions.
The HITAG2
PLUS transponder circuitry is compatible
with the Security Transponder PCF7936AS to support
mixed systems using a HITAG2
PLUS and a standard
Security Transponder, PCF7936AS at the same time.
The Transponder circuitry meets the security and
performance requirements of modern car immobiliser
applications. Excellent device sensitivity (large
distance) and short authentication time ensure easy
application and outstanding system performance. The
Transponder circuitry does not require any battery
supply and full operation is granted in a Keyless Entry
battery low condition.
The Remote Control circuitry features a low power
consumption to ensure long battery lifetime. The device
supports up to four user buttons and a LED for
transmission acknowledgment. Code hopping upon
each button press is provided. The device features
automatic re-synchronisation of the rolling code via the
transponder interface.
The Transponder and rolling code algorithm employ the
same security algorithm for easy system integration on
the receiver side. Separate Secret Keys are provided to
ensure independent code characteristics.
Data rate, modulation and repetition rates of the remote
transmission frame are configurable by the on-chip
EEPROM.
The HITAG2
PLUS features a clock input as an external
data rate reference for use with common PLL
transmitter devices.
Typical Application
Command
Buttons
DOUT
XON
Transmitter
IR
or
UHF (PLL)
VBAT
LED
B 0
B 1
B 2
B 3
PCF7946
Security Transponder
EEPROM
384 Bit
Calculation
Unit
Control
Logic
Power Management
Remote Control
Modulator
Control
Logic
RC
Oscillator
XCLK
VSS
Li
3V
IN1
IN2
TOUT
optional


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