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PCF7936AS

Security Transponder (HITAG2)

NXP Semiconductors. 

NXP Semiconductors

Security Transponder (HITAG2)

Product Specification

PCF7936AS

Mode Select, MS

The device may be configured for to support one out of

three Read Only modes, which will cause the device to

commence data transmission after the specified time-out

period, without interrogation by the basestation, see

Table 1.

Table 1. Mode Select

MS1

0

0

1

1

MS0

0

1

0

1

Read Only Mode

ISO 11784/5

MIRO

PCF7931/30/35

Disabled

Note

1

2

Note

1. Emulates MIRO and H400x like Read Only

transponders

2. Features compatibility with NXP’ PIT family operated in

Read Only mode, except for the PMC timing (Program

Mode Check) and available memory size.

For details regarding the timing and sequence transmitted

refer to section 7.5.

If MS is set, the device does not support Read Only

operation at all.

Data Coding Select, DCS

In Password or Cipher mode data transmitted from the

transponder to the basestation may be encoded in

Manchester or CDP fashion, according to the setting of

DCS.

If DCS is cleared, Manchester encoding is applied,

otherwise CDP coding is applied, see section 7.6.1 for

details.

However, if the device operates in one of the Read Only

modes, data transmission and encoding corresponds to the

Read Only mode selected and is not affected by DCS at all,

see section 7.5 for details.

7.1.5 Password Transponder, PSW T

The Password Transponder, PSW T, is a 24 bit pattern,

which typically is initialized and subsequently locked by the

customer during device personalization. The Password

Transponder is located in page 3, see Figure 4.

The Password Transponder serves the function to identify

the transponder towards the basestation. After successful

device authentication, the transponder returns the content

of page 3 to the basestation. In Password mode the content

is returned in plain, while in Cipher mode the content is

returned in ciphered fashion. For details refer to

section 7.3.1, START_AUTH command.

Thus the Password Transponder and TMCF configuration

may be evaluated by the basestation, if desired. The

Password Transponder may hold any value that is

considered useful by the application.

7.1.6 User Pages, USER 0 to 3

Page 4 to 7 provide space for user data storage. Data

access is supported according to the device configuration

selected.

The user pages may hold any data that is considered

useful by the application.

2010 May 04

10

CONFIDENTIAL

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