Datasheet HTOT840 Datasheet (Philips)

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TM
HT OT840
HITAG
Product Specification Revision 1.1
Antenna Tuning Device
November 1996
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Contents
Contents .................................................................................................................... 2
1. General Remarks .................................................................................................. 3
2. Specifications ....................................................................................................... 3
3. Ordering Information............................................................................................4
4. Using the HITAG Antenna Tuning Device........................................................... 5
4.1. Tuning HITAG Long Range Antennas......................................................................6
4.2. Tuning HITAG Proximity Antennas..........................................................................6
Author: Renate Rossoll
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p

1. General Remarks

For optimal performance HITAG antennas have to be tuned during production, respectively by start-up or, for service purposes, during operation. The HITAG Antenna Tuning Device is a very easy to handle and cost effective solution for the tuning of 125 kHz HITAG antennas. The device is - besides the HITAG antenna training - the optimal complement for antenna design. The HT OT840 therefore is an unrenouncable tool for everybody who designs, produces or even uses HITAG antennas.
The HITAG Antenna Tuning Device can be used for tuning HITAG long range as well as HITAG proximity antennas.

2. Specifications

temperature range: 0 .. 50°C
protection class: IP40
precision at room temperature: measuring current: class 5
measuring phase: class 10
phase sensitivity: ± 50 parts of scale are ± 50° (for rough tuning of an antenna with L 1 mH and Q 40.)
connection: three-pole DIN - connectors
100
200
0
mA
0
10
10
20
20
30
40
50
­ca
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degind
30
40
300
50
+
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3. Ordering Information

Type Name Description Ordering Number
HT OT840 HITAG Antenna Tuning Device 9352 341 60122
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4. Using the HITAG Antenna Tuning Device

The HITAG Antenna Tuning Device is a combined current- and phase measurement device. It can be used for tuning HITAG long range as well as HITAG proximity antennas. Selection between long range and proximity is done with the help of a switch.
The tuning device is connected between antenna and read/write device as described in the following: The cable with plug (DIN 41524) has to be connected to the read/write device, the antenna cable is to be connected to the jack (DIN 41524) of the tuning device.
Adapters - if they are necessary - e.g. for connection of a proximity system, can be built up very easily.
Pin assignment of the DIN connectors:
Pin 1: Ground
Pin 2: Rx (not used for long range antennas)
Pin 3: Tx
Moreover, the cable with one of the two DIN connectors (plugs) can be used to build up an adapter. After connection of the Antenna Tuning Device the operation mode (proximity or long range) has to be chosen with the help of the switch.
Afterwards power supply and read/write device can be switched on.
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4.1. Tuning HITAG Long Range Antennas

The device has to be switched to long range mode. The current should be about 200 mA, a tolerance of ± 10 mA is acceptable.
A current below the tolerance limit implies, that the antenna is badly detuned.
If the current is over the upper tolerance limit you should check the output current of the read/write device. It should be 200 mA ± 10 mA. Otherwise the function of the read/write device should be checked.
For tuning of the antenna refer to the measured phase. The phase should be 0° ± 15° (at a current of 200 mA).
If the phase is too high (direction: inductive) the tuning capacity has to be
decreased.
If the phase is too low (direction: capacitive) the tuning capacity has to be
increased.
After tuning of the antenna the tuning device should be removed.

4.2. Tuning HITAG Proximity Antennas

The device has to be switched to proximity mode (changing the sensitivity). For tuning of the antenna refer to the measured phase. The phase should be 0° ± 10°.
If the phase is too high (direction: inductive) the tuning capacity has to be
decreased.
If the phase is too low (direction: capacitive) the tuning capacity has to be
increased.
For HITAG proximity systems the current reaches its maximum when the antenna is tuned exactly. An approximate value for the current is: 60 to 70 mA ± 10 mA.
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Definitions
Data sheet status
Objective speci ficati on This data sheet contains tar get or goal s peci ficati ons for pr oduct
development.
Preliminary specification
Product specificati on Thi s data s heet contai ns final produc t spec i fications .
Limiting values
Limiting val ues giv en ar e in ac cor dance w i th the Abs olute Maximum Rati ng Sy stem ( I EC 134) . Stress above one or m or e of the lim i ting v al ues m ay c ause per m anent dam age to the devi c e. These are stres s r ati ngs onl y and oper ati on of the devic e at these or at any other c onditi ons above those given in the Char ac ter is ti cs sec tion of the speci ficati on is not i mpl i ed. Expos ur e to limiti ng val ues for ex tended peri ods m ay affect device r eli ability.
Application information
Where application information is given, it is advisory and does not form part of the specification.
This data sheet contai ns prel imi nary data; suppl ementar y data may be published later .
Life support applications
These products are not designed for use in life support appliances, devices, or systems where malfunction of these products can reasonably be expected to result in personal injury. Philips Semiconductors customers using or selling these products for use in such applications do so on their own risk and agree to fully indemnify Philips Semiconductors for any damages resulting from such improper use or sale.
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