ITRF24501 Reader Quick Start Guide
5
climb higher as the sink current increases. There is no protec-
tion on this. You need to ensure that their load won’t require
the reader to sink more than 50 mA.
Input signals should be 0 to +1.5 volt for a low input and +3.5
to +5 volts for a high input. Each input has a 1.1 kohm resistor
in series with clamping diodes, but only about 1
P
A is used until
the input exceeds the 0 to +5 volt input range. There is also a
weak (100 kohm) pull--up to +5 volt on each input.
