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Philips Semiconductors
Preliminary Information
Product Profile
PCF7941
Security Transponder and RISC Controller, STARC lite
Features
General Description
The PCF7941 is a single chip high performance Security
Transponder and Keyless Entry controller, ideally suited for
vehicle immobilizer applications that incorporate keyless entry
functions.
Compatible with Security Transponder, PCF7936AS.
RISC Programmable Keyless Entry features
384 Bit EEPROM
16-Pin SO package
The transponder circuitry is compatible with the Security
Transponder PCF7936AS, for use in mixed systems that
employ a STARC and a standard Security Transponder,
PCF7936AS, at the same time.
Transponder
64/32 bit mutual authentication calculation unit
32 bit unique device identification number
4
t 8 bit Secre Key
Fast mutual authentication (39 ms)
EEPROM read/write protection capability
E5xcellent sensitivity in read and write mode (3
The Transponder circuitry meets the security and
performance requirements of modern car immobilizer
applications. Excellent device sensitivity and short
authentication time ensure outstanding system performance.
The Transponder circuitry does not require any battery supply
and full operation is granted in a Keyless Entry battery low
condition.
T)
RISC Controller
The RISC Controller circuitry is powered by an advanced low
power 8-Bit RISC. The device features 11 I/O ports including
up to four wake-up inputs for command button sensing.
Advanced 8-bit RISC architecture
4 Kbyte ROM, 64 Byte RAM
O
< n-chip RC oscillator ( 10%)
Short instruction execution time (as fast as 1 s)
11 I/O ports, general purpose
Code hopping based on transponder calculation unit
Code hopping synchronization via transponder
Clock input to serve as external data rate reference
Programmable battery low detection
Low power consumption (300 A, PD 300 nA)
Single battery cell operation (2.1V to 5.5V)
Device supply can be derived from LF Field
Code hopping generation may employ the transponder
Calculation Unit, while telegram transmission characteristics
are controlled by the RISC. If the same security algorithm is
applied for the Transponder and the Code Hopping function,
separate Secret Keys are provided to ensure independent
code characteristics. Contactless code hopping
synchronization may be accomplished via the conatctless
interface.
The system timing is derived from a low tolerant on-chip RCOscillator. If desired, an external data rate reference clock
may be applied for use with common PLL transmitter devices.
Typical Application
optional
VBAT
VDD
P15 (XCLK)
P17 (DOUT)
PCF7941
P16 (XON)
Timer
Modulator
User
Extensions
P14 (LED)
I/O
Interrupt
Control
P20
P21
P22
P13 (B3)
RAM
Control
Logic
8 Bit RISC
Calculation
Unit
Transponder Interface
Contactless Interface
IN2
EEPROM
384 Bit
4 K ROM
RISC Controller
Security Transponder
IN1
Transmitter
IR
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