TMS320F28379S_16 Datasheet, PDF (130/213 Pages) Texas Instruments – Programmable Control Law Accelerator

TMS320F28379S, TMS320F28377S
TMS320F28376S, TMS320F28375S, TMS320F28374S
SPRS881C – AUGUST 2014 – REVISED MAY 2016
www.ti.com
5.9.5 Sigma-Delta Filter Module (SDFM)
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 sigma-delta
(ΣΔ) modulated bit stream. The bit streams are processed by four individually programmable digital
decimation filters. The filter set includes a fast comparator for immediate digital threshold comparisons for
overcurrent and undercurrent monitoring. Figure 5-53 shows a block diagram of the SDFMs.
SDFM features include:
• Eight external pins per SDFM module:
– Four sigma-delta data input pins per SDFM module (SDx_Dy, where x = 1 to 2 and y = 1 to 4)
– Four sigma-delta clock input pins per SDFM module (SDx_Cy, where x = 1 to 2 and y = 1 to 4)
• Four different configurable modulator clock modes:
– Modulator clock rate equals modulator data rate
– Modulator clock rate running at half the modulator data rate
– Modulator data is Manchester encoded. Modulator clock not required.
– Modulator clock rate is double that of modulator data rate
• Four independent configurable comparator units:
– Four different filter type selection (Sinc1/Sinc2/Sincfast/Sinc3) options available
– Ability to detect over-value and under-value conditions
– Comparator Over-Sampling Ratio (COSR) value for comparator programmable from 1 to 32
• Four independent configurable data filter units:
– Four different filter type selection (Sinc1/Sinc2/Sincfast/Sinc3) options available
– Data filter Over-Sampling Ratio (DOSR) value for data filter unit programmable from 1 to 256
– Ability to enable or disable individual filter module
– Ability to synchronize all four independent filters of a SDFM module using the Master Filter Enable
(MFE) bit or the PWM signals.
• Filter data can be 16-bit or 32-bit representation
• PWMs can be used to generate modulator clock for sigma-delta modulators
130 Specifications
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