HT2DC20S20 datasheet(6/16 Pages) NXP

6 / 16 page

2001 Oct 01

Philips Semiconductors

Product speciﬁcation

HITAG 2 stick transponder

HT2DC20S20

handbook, full pagewidth

MGW187

READ-ONLY

WAIT

AUTHORIZED

read, write

commands

RF field applied

entering public modes

(if configured)

start authentication

HALT

Fig.2 Status flow.

Status ﬂow

After entering the RF field the transponder waits for a

command to start the authentication (see Fig.2). After

issuing this command the mutual authentication takes

place, followed by read and write commands.

In the password mode the data transfer occurs plain and in

the crypto mode data are encrypted.

The halt state can be entered for muting a transponder.

If the transponder is configured in one of the public modes,

these modes are entered automatically after a certain

waiting time and data pages are sent cyclically to the read

and write device.

By issuing the command to start the authentication during

the waiting time also public mode transponders can be

brought into the authorized state.

Conﬁguration

If you change the configuration (keys or passwords) you

have to place the transponder directly on the antenna

(0-distance)! In order to avoid any errors, do not move the

transponder during this write process and be sure that you

are in a safe environment without electrical noise.

The configuration byte is represented by the first 8 bits of

page 3 of the transponder memory (see Table 2).

HT2DC20S20 Datasheet(PDF) 6 Page - NXP Semiconductors