PCF7941 Philips Semiconductors, PCF7941 Datasheet

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PCF7941

Manufacturer Part Number
PCF7941
Description
Security Transponder and RISC Controller, STARC lite
Manufacturer
Philips Semiconductors
Datasheet

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DataSheet
Philips Semiconductors
Product Profile
Security Transponder and RISC Controller, STARC lite
Features
Transponder
RISC Controller
Typical Application
November 1999
4
Compatible with Security Transponder, PCF7936AS.
RISC Programmable Keyless Entry features
384 Bit EEPROM
16-Pin SO package
64/32 bit mutual authentication calculation unit
32 bit unique device identification number
48 bit Secre
Fast mutual authentication (39 ms)
EEPROM read/write protection capability
Excellent sensitivity in read and write mode (3
Advanced 8-bit RISC architecture
4 Kbyte ROM, 64 Byte RAM
On-chip RC oscillator (
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
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Key
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IN1
IN2
10%)
Security Transponder
Calculation
EEPROM
384 Bit
Control
Logic
Unit
Power Management
V
T)
DD
PCF7941
V
SS
RISC Controller
V
BAT
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.
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.
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.
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.
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 RC-
Oscillator. If desired, an external data rate reference clock
may be applied for use with common PLL transmitter devices.
Modulator
Oscillator
Interrupt
Control
Timer
RC
P15 (XCLK)
optional
Buttons
P17 (DOUT)
P16 (XON)
P14 (LED)
P13 (B3)
P12 (B2)
P11 (B1)
P10 (B0)
P20
P21
P22
Transmitter
UHF (PLL)
User
Extensions
IR
or
Preliminary Information
Li
3V
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