SEN-11828

Due to market price fluctuations,if you need to purchase or consult the price.You can contact us or emial to us:   sales@allicdata.com

1. Describe

The ID2-LA, ID12-LA and ID20-LA series are small form factor 2.8-5.0 volt reader modules that support ASCII, Wiegand26 and Magnetic ABA Track2 data formats. This module is pin and function compatible with the ID2/12/20 series.

2. Feature

    1. Ground

    2. RES (reset bar)

    3. CNC

    4. CNC

    5. CP

    6. Mark Range

    7. Format selector

    8. D1 (Data Pin 1)

    9. D0 (Data pin 0)

  10. Read (LED/Buzzer)

  11. +2.8V to +5.0V

3. Pin configuration

4. Pin Description

5. Power selection

The choice of power source is very important. The ideal power supply would be a linear type such as an LM7805 or a 3.3 volt equivalent. The battery can also be used without a regulator, a suitable arrangement can consist of a 3 volt lithium battery or 3 1.5 volt batteries to provide 4.5 volts. Note that ID-Innovations will be launching a low range series of micropower reader modules (current <1mA) with the same pinout. Switching power supplies are becoming more and more popular, but switching power supplies can cause some problems for 125 KHz readers. The switching frequency cannot be close to a multiple of 125KHz, otherwise serious interference will occur and the reading range will be reduced. Another problem with switching power supplies is output voltage ripple. For good range, the output ripple should be less than 3mV PKPK. This is very demanding on switching power supplies. The best solution with a smaller footprint uses the SOT23 linear LDO regulator. This circuit uses a Zetex device that can also be powered down. Alternatively, the Microchip MCP1702 could be considered, but the maximum current is limited to 50mA, which may not be suitable for the ID-2LA in some cases.

6. Designing Coils for ID-2LA

The recommended inductance is 1.337mH, used with the internal tuning capacitor 1n2. In general, the bigger the antenna, the better, as long as the reader generates enough field strength to excite the tag. The power consumption of the ID-2LA is relatively low, so if you read ISO cards, it is recommended to have a maximum coil size of 15x15cm. For cards with a 10x10cm antenna, read distances up to 30cm or more can be achieved with the Innovations Long Range Clamshell. Determining the exact size of an antenna is a science, but there are so many variables that it is generally best to first get a rough idea of the inevitability of "try it out". Smaller ranges cannot be avoided if the reader is in a heavily disturbed location. In this case, the coil should be made smaller to increase the field strength and coupling. It's hard to give a practical example of a hand-wound coil, as the tightness and slack of the winding can change the inductance significantly. A professionally wound coil will have greater inductance than a similar hand wound coil.

7. Fine-tuning ID-2LA

We recommend using an oscilloscope for fine-tuning. Connect an oscilloscope and observe the 125kHz AC voltage across the coil. Take a fairly large piece of ferrite and bring it to the antenna loop. If the voltage increases, more inductance is required. If the voltage drops as the ferrite rises to the antenna, the inductance is too large. If no ferrite is available, then a piece Aluminum panels can be used to test in a slightly different way. The opposite current will flow in the aluminum, which will act as a negative inductance. If 125kH AC voltage and If the aluminum sheet is close to the antenna, the inductance is too high. Note that the voltage may be maximized first and then decreased. This means that the module is close to optimal tuning. When tested with ferrite, this means a slightly lower value for the coil, and when using an aluminum plate, this means a slightly higher value for the coil.

8. ID-2LA compatibility issues with ID-2

ID2-LA is 100% pin compatible with ID-2, supply voltage is compatible with ID-2, but pin 6 should remain unconnected in ID-2, now used as "in-range marker pin" and its read These functions and output data are also 100% compatible, the only difference is the RF drive power and tuning. The original ID-2 uses an internal 1n5 (0.0015uF) capacitor and an external 1.07mH search coil, while the ID2-LA uses an internal 1n2 (0.0012uF) capacitor and an external 1.337mH search coil. The ID2-LA has a larger RF drive than the ID-2, and the internal tuning capacitor (1n2) requires an external antenna inductance of 1.337mH. If an inductor of this value is used, no external tuning capacitor is required. Note that the original ID-2 search coil (value 1.07mH) can still be used if an external COG capacitor of 180pF or 220pF is added between pin 1 and pin 4. As with the ID-2, the ID2-LA internal tuning capacitors can be used on pins 1 and 4. If an external capacitor is added, it should be 100v 180pF COG or 100v 220pF COG. The ID2-LA RF output driver is larger than the ID-2 RF driver. Users wishing to migrate to the ID2-LA should ensure that the RF voltage and current limits are not exceeded.