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Like
similar radio frequency identification devices, the Low-Power
"Contactless" Tag Reader is useful for various electronics
projects such as access control, object identification,
and automotive applications. The 125-kHz reader is designed
around the PSoC CY8C26233. The CY8C26233 has sufficient
memory and processing power to be programmed in C, thus
making it easy to upgrade and adapt for future extensions.
A
built-in boost converter enables an interesting feature:
the reader can function at voltages as low as 2 V. The
detection mechanism reduces the mean power consumption
to low levels and makes this reader design a good choice
for portable applications.
No
external components other than the input stage (using
only passive parts) are required. The analog conditioning
stage can be reconfigured and the firmware reprogrammed
to adjust to a particular encoding scheme. The reader
features 3 to 5 KB of flash memory and 25 bytes of RAM.
It averages power consumption at rates of: 5 V at 50 ľA
(best sensitivity); 3.5 V at 20 ľA; 3.2 V at 120 ľA with
the internal boost converter; and 2.2 V at 220 ľA with
the internal boost converter.
Chanh
Ho Minh
France
chanh@itronic.com
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