资料介绍
This application note explains the design of transpon-
der coils. An Excel spreads heet is used to automate the
update of values, depending on the specified parame -
ters. The spreadsheet file name is transpnd.xls. A zip
file containing this spreadsheet and a copy of this appli -
cation note can be downloaded from Microchip’s web
site at www.microchip.com .
The basic approach is to choose the transponder coil
external dimensions, since volume will usually be the
primary constraint for a coil as it will need to fit into a
keyfob, credit card or other small volume. Secondly,
properties of the core, coil windings as well as the
equivalent load placed across the coil are entered. This
fixes the Initial Coil Specification.
Once the initial coil is built, measurements are made on
this coil to determine the coil quality factor. These mea -
surements are used to calculate the Optimum Coil
Specification for a second coil. AN650
Designing a Transponder Coil for the HCS410
Authors: Mike Sonnabend, Jan van Niekerk SPREADSHEET FEATURES
Microchip Technology Inc. The spreadsheet is split into three worksheets. The first
worksheet concerns the initial coil specification. The
OVERVIEW inputs to this worksheet are the:
coil external dimensions
This application note explains the design of transpon-
der coils. An Excel spreadsheet is used to automate the core effective relative
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