HT2DC20S20 datasheet(5/16 Pages) NXP

5 / 16 page

2001 Oct 01

Philips Semiconductors

Product speciﬁcation

HITAG 2 stick transponder

HT2DC20S20

FUNCTIONAL DESCRIPTION

Memory organization

The memory of the transponder consists of 256 bits

EEPROM memory and is organized in 8 pages with 32 bits

each.

Depending on the operating mode the EEPROM is

organized as described in Table 1.

Table 1

Memory organization

Operating modes

With the configuration byte, the operating mode and the

access rights to the memory can be selected.

During power-up of the transponder the configuration byte

is read from the EEPROM of the transponder.

The HT2DC20S20 can operate in several modes:

• Crypto mode

Mode for writing or reading the transponder with

encrypted data transmission.

• Password mode

Mode for writing or reading the transponder with plain

data transmission.

• Public mode A (Manchester)

Read-only mode. The 64 bits of the user pages 4 and 5

are cyclically transmitted to the read and write device.

• Public mode B (biphase)

Read-only mode according to ISO standards 11784

and 11785 for animal identification. The 128 bits of the

user pages 4 to 7 are cyclically transmitted to the read

and write device.

• Public mode C (biphase)

Read-only mode emulating the read operation of the

PCF793X (with a slightly different program mode

check). In the public mode C the 128 bits of the user

pages 4 to 7 are cyclically transmitted to the read and

write device.

PAGE

CONTENT

Crypto mode

serial number

32 LSBs of 48-bit key

16 MSBs of 48-bit key; 16 bits reserved

8-bit conﬁguration; 24-bit password TAG

read/write page

Password mode

serial number

password RWD

reserved

8-bit conﬁguration; 24-bit password TAG

read/write page

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