PCF7941ATJ datasheet(5/18 Pages) NXP

5 / 18 page

NXP Semiconductors

Product Specification

Security Transponder and RISC Controller (STARC 2XLite)

PCF7x41ATJ

2013 Oct 15

CONFIDENTIAL

BLOCK DIAGRAM

The PCF7x41ATJ features a high degree of integration and

incorporates the chip, coil and capacitors assembled in a

leaded stick package, see Figure 2.

Package

 L/C Resonance Circuit

 Rectified LF Filed supply blocking capacitor

Contactless Interface

 Rectifier and Voltage Limiter

 Modulator

 Clock Recovery

 Demodulator

 LF Field Detection

Calculation Unit

 HT2 (48 bit) and HT3 (96 bit) Algorithm

Power Management

 Supply Switch Logic

 Wake Up Sense (Button I/O)

 Watchdog Timer

 Reset Logic

RISC Controller and Peripherals

 8 Bit RISC (MRK )

 ROM (Firmware)

 E-ROM (Application program)

 RAM

 EEPROM

 Interrupt Control

 Timers / Counters

 I/O Ports

 Programmable Voltage Comparator

 System Clock (including on-chip RC oscillator)

PCF7941ATJ (PCF7341ATJ)

V7941 (V7341)

Timer

Modulator

Interrupt

Control

Oscillator

128 Byte

RAM

4 K

EROM (ROM)

Calculation

Unit

512 Byte

EEPROM

I/O

4 K

ROM

IN1

IN2

VFLD

Power Management

Resonance

circuit

VSS

fRES = 125 kHz (typ)

CVFLD

PCF7941ATJ (PCF7341ATJ)

V7941 (V7341)

Timer

Modulator

Interrupt

Control

Oscillator

128 Byte

RAM

4 K

EROM (ROM)

Calculation

Unit

512 Byte

EEPROM

I/O

4 K

ROM

IN1

IN2

VFLD

Power Management

Resonance

circuit

VSS

fRES = 125 kHz (typ)

CVFLD

Figure 2. Block Diagram

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