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15
ID-2/12/20 LA Series Datasheet X1
11.04.2013
15. ID-2LA Compatibility Issues with the ID-2
With the exception of pin6, which should be left unconnected in the ID-2, and which now serves as
a ‘Tag in range Pin’, the ID2-LA is 100% pin compatible and supply voltage compatible with the ID-2
and its read and output data functionality is also 100% compatible, the only difference is the RF
drive power and tuning. The original ID-2 employed an internal 1n5 (0.0015uF) capacitor and an
external 1.07mH search coil, the ID2-LA employs an internal 1n2(0.0012uF) capacitor and an
external 1.337mH search coil.
The ID2-LA has a greater RF drive than the ID-2 and the internal tuning capacitor (1n2) requires an
external antenna inductance of 1.337mH. If this value inductance is used an external tuning
capacitor is not required.
Note that the original ID-2 search coil (value 1.07mH) may still be used if a 180pF or a 220pF
external COG capacitor is added across pins 1 and 4. As with the ID-2, the ID2-LA internal tuning
capacitor can be accessed on pins 1 and 4. If an external capacitor is added it should be a 100v
180pF COG or a 100v 220pF COG. The ID2-LA RF output drive is greater than the ID-2 RF drive. Users
wishing to migrate to the ID2-LA should ensure that the RF voltage and current limits are not
exceeded.
16. ID-12LA, ID-20LA Compatibility Issues with ID-12, ID-20
With the exception of pin6, which should be left unconnected in the ID-12 and ID-20, and which
now serves as a ‘Tag in range Pin’, the ID12-LA and ID20-LA is 100% pin compatible and supply
voltage compatible with the ID-12 and ID-20 and its read and output data functionality is also 100%
compatible.
17. Layout Precautions for ID-12LA and ID-20LA
The layout of the mother board is important. Below is a short list of steps to ensure good read
range.
1) Never put a copper ground plane under an ID-12LA or an ID-20LA. The antenna in the
module will couple with the copper and the copper will act as a shorted turn. A shorted turn
acts much like a negative inductance and will detune the antenna in the module.
2) Never run a noisy supply track under the module. The track will couple with the antenna and
the noise will reduce the read range.
3) Never run the tracking of decoupling capacitors for other circuitry, processor etc., under the
module.
4) Track the module supply decoupling capacitor as close to pin1 and pin11 as possible.