SDFM

Table of Contents

• Introduction
• Features Supported
• Features Not Supported
• ICSS SDFM Design
• Example
• API

Introduction

ICSS SDFM is a sigma delta interface for phase current measurement in high performance motor and servo drives. During Sigma delta decimation filtering (SDDF) the PRU hardware provides hardware integrators that do the accumulation part of Sinc filtering, while the ICSS SDFM firmware does differentiation part.

Features Supported

• 3 SDFM channels on single PRU core
• Overcurrent (OC) for comparator: free running SINC3 filter with OSR 32-256
• Normal current (NC) for data read: free running SINC3 filter with OSR 32-256, always multiple of OC OSR (NC OSR = K*OC OSR :: K ∈ Z)
• Event generation(ARM interrupt for data read from DMEM, GPIO toggle for high and low thresholds)
• High and Low threshold comparator

Features Not Supported

• Zero cross comparator
• Below 32 OSR

ICSS SDFM Design

SDFM Interface Design explains the design in detail.

Example

SDFM

API

APIs for SDFM