Sigma Delta Filter Module (SDFM)
6 - 26 TMS320F2837xD Microcontroller Workshop - Analog Subsystem
Sigma Delta Filter Module (SDFM)
Sigma Delta Filter Module (SDFM)
SDFM is a four-channel digital filter designed
specifically for current measurement and resolver
position decoding in motor control applications
Each channel can receive an independent modulator
bit stream
Bit streams are processed by four individually
programmable digital decimation filters
Filters include a fast comparator for immediate
digital threshold comparisons for over-current
monitoring
Filter-bypass mode available to enable data logging,
analysis, and customized filtering
The SDFM is a four-channel digital filter designed specifically for current measurement and
resolver position decoding in motor control applications. Each channel can receive an
independent delta-sigma modulator bit stream which is processed by four individually
programmable digital decimation filters. The filters include a fast comparator for immediate digital
threshold comparisons for over-current and under-current monitoring. Also, a filter-bypass mode
is available to enable data logging, analysis, and customized filtering. The SDFM pins are
configured using the GPIO multiplexer. A key benefit of the SDFM is it enables a simple, cost-
effective, and safe high-voltage isolation boundary.
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