Mounting Considerations; Presence Detection Illumination System - HID Lumidigm M Series Mechanical Integration Manual

Lumidigm M-Series M3xx Modules Mechanical Integration Guide, PLT-02217, Rev. A.0

3 Mounting Considerations

3.1

Presence Detection Illumination System

The PD illumination system is directional and the user must approach the sensor from the
correct direction, the side opposite of where the flex cable enters the M3xx sensor head.
The mechanical design of the enclosure should enforce this approach direction. If the
approach direction is rotated by 180 degrees, the blue light will be directed toward the user
and will impact overall user experience with the product. In Figure 3 below, the correct user
approach direction is from left to right with the blue light directed towards the right (away
from the user).
Figure 3: Presence detection illumination pattern
The blue PD LED is illuminated when the sensor is armed. The enclosure design and the
placement of the enclosure need to accommodate the emission from this source. The
duration of the PD emission is application-dependent. In applications where the transaction
is initiated by touching the sensor, the blue PD LED will be illuminated constantly. In
applications where some other action initiates the transaction (for example, entering a PIN
on a keypad) the blue PD LED will only be active from this event until a fingerprint is
captured. Figures 4 and 5 provide details of the PD illumination pattern.
December 2014
Flex Cable connector
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