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PCF7936AS

Security Transponder (HITAG2)

NXP Semiconductors. 

NXP Semiconductors

Security Transponder (HITAG2)

Product Specification

PCF7936AS

4 BLOCK DIAGRAM

The PCF7936AS features a high degree of integration and

incorporates the transponder chip, coil and capacitor

assembled in a leadless stick package, see Figure 1.

Security Transponder

• Contactless Interface

• EEPROM (256 bit)

• Control Logic

• Calculation Unit (security algorithm)

• Reset Logic

• Test Logic

Security Transponder

IN1

IN2

Resonance/antenna circuit

fRES = 125 kHz (typ)

Security Transponder Chip

Contactless Interface

Rectifier

Voltage Limiter

EEPROM

(256 Bit)

Modulator

Clock

Recovery

Control Logic

Demodulator

LF Field

Power On Reset

Calculation

Unit

Test Logic

Figure 1. Block Diagram

5 TYPICAL APPLICATION

To Micro-

controller

Inductive Link

fSYS = 125 kHz (typ)

Basestation

Analog

Interface

Energy

Serial

Interface

PCF 7991

Write

Read

Figure 2. Typical System Configuration

Security Transponder

PCF 7936AS

Security Transponder Chip

Contactless Interface

Rectifier

Voltage Limiter

EEPROM

(256 Bit)

Modulator

Clock

Recovery

Control Logic

Demodulator

LF Field

Power On Reset

Calculation

Unit

Test Logic

2010 May 04

5

CONFIDENTIAL

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