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PCF7946AT Datasheet Preview

PCF7946AT Datasheet

Security Transponder Plus Remote Keyless Entry

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Product Profile
PCF7946AT
Security Transponder plus Remote Keyless Entry, HITAG2PLUS
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)
Typical Application
General Description
The HITAG2PLUS is a high performance monolithic
Security Transponder and Remote Keyless Entry Chip
ideally suited for car immobiliser applications that
incorporate keyless entry functions.
The HITAG2PLUS transponder circuitry is compatible
with the Security Transponder PCF7936AS to support
mixed systems using a HITAG2PLUS 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 HITAG2PLUS features a clock input as an external
data rate reference for use with common PLL
transmitter devices.
optional
VBAT
PCF7946
XCLK
Security Transponder
IN1 EEPROM
384 Bit
Remote Control
Modulator
DOUT
XON
Calculation
Unit
Control
IN2 Logic
Control
Logic
RC
Oscillator
LED
B3
B2
B1
Power Management
B0
VSS
TOUT
Transmitter
IR
or
UHF (PLL)
Command
Buttons
Li
3V
June 1999


Part Number PCF7946AT
Description Security Transponder Plus Remote Keyless Entry
Maker Philips
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