TIDA-00178

Interface to a Sin/Cos Encoder with Sitara AM437x Reference Design

TIDA-00178

Design files

Overview

The TIDA-00178 reference design is an EMC compliant industrial interface to Sin/Cos position encoders. Applications include industrial drives, which require accurate speed and position control.

The design utilizes a 16-bit dual sample ADC with drop-in compatible 14- or 12-bit versions available, allowing for optimization of performance and cost. TIDA-00178 provides a direct connection to Sitara AM437x using SPI and QEP. For quick evaluation it features a 60-pin connector which directly fits the AM437x IDK. An example firmware for Sitara AM437x IDK is provided, which outputs the measured angle from the Sin/Cos encoder with up to 28-bit resolution through the Sitara’s USB virtual COM port.

Features

EMC Compliant Industrial Interface Design for Sin/Cos Encoders with 1-Vpp Differential Output at 2.5-V Offset, Input Frequencies up to 500-kHz
High-Resolution Interpolated Position, up to 28-bits Resolution, Cable Length Tested up to 70m
Fully Differential Analog Signal Chain for High Common Mode Noise Immunity with Dual 16-bit ADC with Drop-in Compatible 14- or 12-bit ADC Pending Desired Resolution
Easy to Connect to Sitara AM437x with SPI and QEP Interface. Connects directly to AM437x IDK 60-Pin Header
Example Firmware for Sitara AM437x with High-Resolution Angle Calculated at 32-kHz and Angle Data Send via USB virtual COM Port for Easy Performance Evaluation
Designed for IEC61000-4-2,4-4 and 4-5 (ESD, EFT and Surge EMC Immunity Requirements)

Industrial

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A fully assembled board has been developed for testing and performance validation only, and is not available for sale.

Design files & products

Design files

Download ready-to-use system files to speed your design process.

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Design guide — TIDA-00178

TIDUA77A.PDF (6385 K)

Reference design overview and verified performance test data

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Schematic — TIDA-00178

TIDRFV1.PDF (716 K)

Detailed schematic diagram for design layout and components

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Bill of materials (BOM) — TIDA-00178

TIDRFV2.PDF (38 K)

Complete listing of design components, reference designators, and manufacturers/part numbers

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Assembly drawing — TIDA-00178

TIDRFV3.PDF (560 K)

Detailed overview of design layout for component placement

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CAD/CAE symbol — TIDA-00178

TIDRFV5.ZIP (3022 K)

Files used for 3D models or 2D drawings of IC components

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Gerber file — TIDA-00178

TIDCAL7.ZIP (565 K)

Design file that contains information on physical board layer of design PCB

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PCB layout — TIDA-00178

TIDRFV4.PDF (3990 K)

PCB layer plot file used for generating PCB design layout

Products

Includes TI products in the design and potential alternatives.

Buck converters (integrated switch)

TPS5401 — 3.5V to 42V Input, 0.5 A Step Down Converter

Data sheet: PDF | HTML

Comparators

TLV3202 — 5.5-V, high-speed, dual push-pull comparator

Data sheet: PDF | HTML

Fully differential amplifiers

THS4531A — Ultra Low Power, RRO, Fully-Differential Amplifier

Data sheet: PDF | HTML

Linear & low-dropout (LDO) regulators

TPS717 — 150-mA, high-PSRR, low-IQ, low-dropout voltage regulator with enable

Data sheet: PDF | HTML

Linear & low-dropout (LDO) regulators

TPS799 — 200-mA, low-IQ, low-dropout voltage regulator with low-noise & enable

Data sheet: PDF | HTML

Noninverting buffers & drivers

SN74LVC3G17 — 3-ch, 1.65-V to 5.5-V buffers with Schmitt-Trigger inputs

Data sheet: PDF | HTML

Precision ADCs

ADS8354 — Dual 700kSPS 16-Bit Simultaneous-Sampling SAR Analog-to-Digital Converter (ADC)

Data sheet: PDF | HTML

Series voltage references

REF2025 — 8-ppm/°C drift, low-power, dual-output Vref & Vref/2 voltage reference

Data sheet: PDF | HTML

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Software

Support software

TIDCAL8 — TIDA-00178 Sin/Cos Encoder AM437 Software

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TIDCAL8 — TIDA-00178 Sin/Cos Encoder AM437 Software

Latest version

Version: 01.00.00.00

Release date: 05 Jul 2015

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TIDA-00178 Sin/Cos Encoder AM437 Software (zip) — 38 K

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Technical documentation

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	Type	Title		Date
*	Design guide	Interface to a Sin/Cos Position Encoder With Sitara AM437x Design Guide (Rev. A)		Sep. 14, 2015
	Technical article	Designing an EMC-compliant interface to motor position encoders – Part 5		Nov. 10, 2015

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