HTRM800/AED,122 Datasheet HTRM800/AED,122 | P7-P9

2001 Oct 04 7

Philips Semiconductors Product speciﬁcation

HITAG long range reader module

hardware

HTRM800 family

7.3.2 INTERFACE MICROCONTROLLER TO HOST

The device communicates with the host system via a serial

interface using a baud rate of 9600 baud. Data transfer

details are: 1 start bit, 8 data bits, 1 stop bit, no parity bit

and the least significant bit is sent first.

Version HTRM800/AED has an integrated RS232 level

driver. Version HTRM800/CED is wired with an RS485

level driver and version HTRM800/EED is wired with a

CMOS level driver.

7.3.3 TRANSMITTING PART

For transmitting power and data to the transponder a

125 kHz sine signal is switched by the microcontroller and

amplified. The amplifier is designed as a current source.

A voltage limiter is used to clamp the output voltage of the

amplifier during the decay and transient phases of the sine

signal.

7.3.4 RECEIVING PART

After filtering and demodulation of the amplitude

modulated signal received from the transponder, the

received data is converted and passed to the Digital Signal

Processing (DSP) unit for further processing.

7.3.5 DIGITAL SIGNAL PROCESSING UNIT

The receiving part of the reader module includes

bandpass filters which attenuate disturbances (3 dB

attenuation at 105 and 145 kHz). For disturber

frequencies near the 125 kHz (e.g. harmonics of the line

frequency of PC monitors, long wave transmitters) a

fourier transformation is used to recognize harmonic

disturbers and to eliminate their influence. The DSP is also

responsible for separating the responses of different

transponders during anticollison cycles (multiple

transponder operation).

7.3.6 PERIODIC DISTURBERS

There are a couple of possible sources for disturbances for

a 125 kHz system like HITAG. The HTRM800 is designed

to handle this problem and achieve optimal performance

under worst conditions.

Long wave transmitters, other 125 kHz systems and

PC monitors are examples for periodic disturbers which

can be relevant for 125 kHz systems. To eliminate these

disturbers the digital signal processing unit is used.

After the command StartFFT is sent to the reader module

a Fast Fourier Transformation (FFT) is started to locate

periodic disturbers. After about 110 ms this calculation is

finished and for the following communication between

reader module and transponder the located disturbers are

eliminated. The command StartFFT should be executed

as often as the application allows.

Remarks:

1. The DSP is able to suppress up to two harmonic

electromagnetic disturbances

2. During FFT is running (about 110 ms) communication

with a transponder is not possible.

7.3.7 VOLTAGE REGULATING UNIT

The reader module contains some filtering circuits which

supply all parts of the reader module with the required

voltages. Nevertheless some requirements are to be

fulfilled by the external power supply. This means the

maximum ripple of the supply voltages must not exceed

the values specified in Chapter 8.

7.3.8 STANDBY MODE

The HTRM800 offers a software controlled standby mode.

This mode can be activated and deactivated by the host

system. During the standby mode the amplifier is turned off

and the power consumption decreases drastically.

7.3.9 BEHAVIOUR WITH HITAG 1 TRANSPONDERS

If several HITAG 1 transponders arrive simultaneously

within the communication field of the antenna of a

HTRM800, all the transponders (theoretically up to 2

)

within the communication field of the antenna can be read

and written simultaneously. Because of the mutual

influence of the transponder coils - they detune each other

if there are too many too close to each other - the number

of the transponders that can be operated simultaneously is

limited.

7.3.10 BEHAVIOUR WITH HITAG 2 TRANSPONDERS

If several HITAG 2 transponders arrive simultaneously

within the communication field of the antenna of a

HTRM800, the ‘stronger’ transponder (the nearer one)

takes over or - under special circumstances - no

communication takes place. If the transponders arrive in

the field one after the other, communication is established

with the first one, all the other transponders are ignored.

This ensures that no two (or several) HITAG 2

transponders will ever be processed (above all written to!)

accidentally at the same time. By muting a selected

HITAG 2 transponder (HALT mode) another HITAG 2

transponder that is to be found in the communication field

of the antenna can be recognized.

2001 Oct 04 8

Philips Semiconductors Product speciﬁcation

HITAG long range reader module

hardware

HTRM800 family

7.4 Postal approval

The postal approval can only be granted for final products,

not just for components like the HTRM800. But this reader

module is designed in a way that it is possible to get the

postal approval for a system including the HTRM800.

Electromagnetic emissions comply with the guidelines in

FTZ 17 TR 2100, ETS 300 330 and ETS 300 683.

Electromagnetic immunity complies with the guidelines in

ETS 300 683.

The following configuration is in compliance with the

European telecommunication standards:

• Reader module HTRM800

• Power supply according to the recommendations

(transformer type)

• Antenna: 50 × 70 cm, number of turns N = 26 and

inductivity L = 1.2 mH.

A survey of the passed measurements is given in Table 1.

Table 1 Survey of measurements

ITEM MEASUREMENT STANDARD REQUIREMENTS

EMI electromagnetic emission ETS 300 330, Sep 1994 FTZ 17 TR 2100

RFI emission limit class EN 55022, 1987

Immunity RF electromagnetic ﬁeld ENV 50140 80 to 1000 MHz: 3 V/m, AM 80%, 1 kHz

electrostatic discharge IEC 801-2, 1991 contact discharge: 4 kV; air discharge: 8 kV

electrical fast transient

(burst)

IEC 801-4, 1988 signal ports: 0.5 kV; DC power ports: 1 kV;

AC power ports 2 kV

RF common mode ENV 50141 current clamp injection 150 kHz to 80 MHz:

3 V (rms), AM 80%, 1 kHz

voltage dips and

interruptions

IEC 1000-4-11 reduction of 30% of UN for 10 ms, of 60% of

UN for 100 ms, voltage interruption for 5 s

surges, common and

differential mode

IEC 1000-4-5 AC power input ports: 1 kV

(lines-to-ground), 0.5 V (line-to-line)

7.5 Operating security

The following mechanisms ensure the operation security

of the HITAG system:

• Anticollission mode

• Monitoring the supply voltage

• Antenna rupture and short circuit.

7.5.1 ANTICOLLISION MODE

Anticollision mode in long range applications permits you

to process several HITAG 1 transponders simultaneously.

Theoretically up to 2

HITAG 1 transponders can be

processed simultaneously. In practice this number is

limited, because of the mutual influence of the

transponders. They detune each other, if there are too

many too close to each other. In long range applications

using HITAG 2 transponders, only one transponder is

handled even if there are several transponders within the

communication field of the antenna. In this case either no

communication takes place or the ‘stronger’ or closer

transponder takes over.

By muting a selected transponder (HALT mode) another

transponder that is to be found in the communication field

of the antenna can be recognized.

7.5.2 MONITORING THE SUPPLY VOLTAGE

The supply voltage is controlled by a watch dog circuit

which triggers a system reset if the supply voltage of the

core module drops below 4.75 V or if the microcontroller

fails.

7.5.3 ANTENNA RUPTURE AND ANTENNA SHORT-CIRCUIT

The HTRM800 does not get permanently damaged in case

of an antenna rupture or a brief antenna short-circuit. The

detection of detuned or broken antennas (antenna

malfunction) is possible.

2001 Oct 04 9

Philips Semiconductors Product speciﬁcation

HITAG long range reader module

hardware

HTRM800 family

7.6 Security considerations

Developing the HITAG system special consideration was

given to aspects of security. The following items represent

the fundamental framework of the security concept:

• Cryptography

• Mutual authentication

• Password verification

• Cyclic Redundancy Check (CRC).

7.6.1 DATA PRIVACY

The use of cryptography (stream cypher), mutual

authentication, and password verification prevents

monitoring and copying the data channel. Therefore, the

area of the transponder that only can be accessed

enciphered is called ‘secret area’.

To make use of cryptography for HITAG 1 transponders

you need:

• Keys to be used for initializing of the crypto block

• Logdata to be used for mutual authentication.

To make use of cryptography for HITAG 2 transponders

you need:

• A key which is used to initialize the crypto block using

HITAG 2 in crypto mode

• Passwords which are used for authentication for

HITAG 2 in password mode.

The transponders and the HTRM800 are provided with

identical transport keys and transport logdata so that you

can start operating them right away (see Table 2).

In order to offer our OEM clients high flexibility, the

configuration of the transponder memory, password, keys

and logdata can be changed. We strictly recommend to

rigorously restrict these possibilities for the end customers

(by setting the configuration page to read only, setting

password, keys and logdata to neither read nor write).

Table 2 Transport values predeﬁned by Philips.

SYSTEM PARAMETER VALUE

HITAG 1 keyinit password 0x00000000

keys 0x00000000

logdata 0x00000000

HITAG 2 keyinit password 0x00000000

key 0x4D494B524F4E

password TAG 0xAA4854

password RWD 0x4D494B52

P1-P3 P4-P6 P7-P9 P10-P12 P13-P15 P16-P18 P19-P20

HTRM800/AED,122

Mfr. #:

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Manufacturer:

NXP Semiconductors

Description:

RFID READER R/W 125KHZ RS232

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HTRM800/AED,122