PCF7936AS datasheet(5/32 Pages) PHILIPS

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NXP Semiconductors

Product Specification

Security Transponder (HITAG2)

PCF7936AS

2010 May 04

CONFIDENTIAL

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

Security Transponder Chip

Calculation

Unit

Rectifier

Voltage Limiter

Contactless Interface

Control Logic

EEPROM

(256 Bit)

LF Field

Power On Reset

Modulator

Demodulator

Clock

Recovery

IN1

IN2

Test Logic

Resonance/antenna circuit

fRES = 125 kHz (typ)

Figure 1. Block Diagram

TYPICAL APPLICATION

Energy

Write

Read

Basestation

Analog

Interface

Serial

Interface

PCF 7991

To Micro-

controller

Inductive Link

fSYS = 125 kHz (typ)

Security Transponder

PCF 7936AS

Security Transponder Chip

Calculation

Unit

Rectifier

Voltage Limiter

Contactless Interface

Control Logic

EEPROM

(256 Bit)

LF Field

Power On Reset

Modulator

Demodulator

Clock

Recovery

Test Logic

Figure 2. Typical System Configuration

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