NXP Semiconductors

Product Specification

Security Transponder (HITAG2)

PCF7936AS

2010 May 04

28

CONFIDENTIAL

10.2 Timing Characteristics

SYMBOL

PARAMETER

CONDITION

MIN

TYP

MAX

UNIT

Command Handling

Transponder response delay

199

206

Basestation response delay

90

EEPROM erase/write time

615

Idle time

80

ms

Data Transmission

Bit duration

32

Write pulse width

Note 1

4

10

Write pulse repetition time, logic 0

18

22

Write pulse repetition time, logic 1

26

32

Write pulse length, stop condition

36

LF Field Power On Reset, Note 2

Transponder initialization time

80

μs

Transponder initialization time

225

5

ms

Read Only Mode

Timeout for START_AUTH command

320

Read Only Mode startup delay

Note 3

326

Notes

1. As detected by the transponder interface demodulator. The corresponding LF Field write pulse width applied by the

basestation depends on the resonance circuit properties and actual system coupling factor.

2. Characterized with the Scemtech test equipment STM-1 in a Helmholtz arrangement according to section 11.

3. Total delay (Tinit + Twait,RO) = 551 T0