iCLASS SE Reader Module Hardware Developer’s Guide, SE3200-902, Rev. C.1
February 2014 Page 14 of 52
2.4 Peripheral Circuits
The following section details recommended peripheral circuitry.
2.4.1 External Pull-up Resistors
External pull-up resistors may be required on the UART Tx and MOSI lines to prevent
floating I/O anomalies.
2.4.2 External Noise Filter
If false card detections occur in Ultra Low Power mode, or the host has spectral noise,
a line filter designed to block frequencies in the 10 KHz to 50 KHz range is beneficial
when inline with the power line.
2.4.3 Adding External LEDs and Beeper
The Cathodes are connected through an external resistor to the RED or GREEN LED
connector port signals. The OEM supplies current limiting resistors for modules.
The value of these resistors depends on how much current is provided for the LEDs.
Consider the combined voltage drop of the resistor and OEM75 output low voltage on
these signal lines when selecting the LED brightness.
2.5 Transitioning from the OEM50, OEM75 and eProxL Modules
Provided are suggestions for transitioning from the HID OEM50 and eProx Lock
modules to the OEM75.
2.5.1 OEM50
If you are transitioning from an OEM50 – here are the differences.
• The OEM50 connector is a 2 X 6 0.1" space pin header or PWB hole pattern.
• The OEM50 has a two-wire interface to the antenna and the iCLASS SE Reader
has a 2-wire interface for NPM and a 5-wire interface for ULPM applications.
Therefore, it is possible that the OEM50 antenna will work with the SIO
Processor Board in NPM.
• The harness and signal changes to adapt the signals from the OEM50 2 X 6
pattern to an OEM75 1 x 9 1.25mm pattern are the following.
Note: The additional P2 for HSI and SPI interfaces are 1 x 8 1.25mm pattern.
Pin 1 Exc Supply No signal on the SE32XX
Pin 2
Exc Return is
not used
No signal on the SE32XX
Pin 3 Serial Transmit Same as P301 pin 8 - UART Transmit
Pin 4 Serial Receive Same as P301 pin 7 - UART Receive
Pin 5 Vdd Return Same as P701 pin 2 - Battery Minus
Pin 6 Vdd +5VDC
Same as P701 pin 1 - Battery Positive
and 5VDC is a good supply voltage
P1 Connector
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