iCLASS SE Reader Module Hardware Developer’s Guide, SE3200-902, Rev. C.1
Page 13 of 52 February 2014
2.3 Theory of Operation
2.3.1 Power Modes
• Normal Power Mode (NPM) – The module is constantly powered on and polling
for cards. The module is never asleep in this mode. Use this mode with an
external power supply. The module is always ready to receive a command from
the host.
• Ultra Low Power Mode (ULPM) – This power mode was designed for fixed
location battery powered applications (for example, door or cabinet lock). The
module is constantly monitoring the antenna for an impedance shift to detect a
card presented to the antenna. Once detecting an impedance shift on the HF
antenna, the module wakes up and polls for cards in the field. If a card is
detected in the RF field, the module reads the card data, pulses the Card Present
line, outputs the card data, and goes back to sleep within a configured period of
time to conserve power.
Note: If developing a handheld unit, operate the iCLASS SE Reader Module in
Normal Power Mode and disable the power when not in use.
NPM
ü ü
ULPM
ü
after autonomous output
2.3.2 Module – Transponder Interaction
Autonomous Mode – The iCLASS SE Reader Module is intended to automatically
access and report the secure payload or the serial number (UID/CSN) of a
transponder. Thereby it acts on its protocols and applications configuration to
automatically report the payload on its Wiegand, UART and/or SPI ports.
Advanced Protocol Interface Mode (API) – The host communicates with the
transponder in the field through the iCLASS SE Reader Module’s serial protocol.
(UART or SPI is required)
Note: API calls are available in ULPM after the module outputs its autonomous data
(configuration dependant).
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