原标题：TI TMS320F28377D和AMC1304M25数据采集系统参考设计

　　TI公司的Delfino tms320F28377D是双核32位浮点微控制器单元(MCU),支持新的双核C28x架构,大大地提升了系统性能.每核提供200MHz的信号处理性能,集成了512KB或1MB闪存,172KB或204KB RAM,主要用在工业驱动,智能计量,太阳能微逆变器和转换器,汽车运输雷达动力线通信,数字电源和软件定义无线电.本文介绍了TMS320F28377D主要特性,框图和模拟子系统框图以及基于ΔΣ ADC和MCU的数据采集系统主要特性,完整框图,电路图和材料清单以及PCB元件布局图.

　　The Delfino TMS320F2837xD is a powerful 32-bit floating-point microcontroller unit (MCU) that lets designers consolidate control architectures and eliminate multiprocessor use in high-end systems. While the Delfino product line is not new to the TMS320C2000 portfolio, the dual-core F2837xD supports a new dual-core C28x architecture that significantly boosts system performance while further providing consolidation through integrated analog and control peripherals.

　　The dual real-time control subsystems are based on TI’s 32-bit C28x floating-point CPUs, which provide 200 MHz of signal processing performance in each core. The C28x CPUs are further boosted by the new TMU accelerator, which enables fast execution of algorithms with trigonometric operations common in transforms and torque loop calculations; and the VCU accelerator, which reduces the latency for complex math operations common in encoded applications.

　　The F2837xD features two real-time control accelerators, also known as Control Law Accelerators (CLAs). The CLA provides an additional floating-point accelerator used to run parallel time-critical control algorithms, providing bandwidth for the C28x to focus on system tasks. The dual C28x + CLA architecture also provides intelligent partitioning of system-critical tasks and allows simultaneous management of these tasks, such as tracking speed and position in one core while managing control-side algorithms to calculate torque loops in the other CPU + CLA.

　　The TMS320F2837xD supports up to 1MB of onboard flash memory with error correction code (ECC) and up to 204KB of SRAM. Two 128-bit secure zones are also available on each CPU for code protection.

　　Performance analog and control peripherals are also integrated on the F2837xD MCU to further enable system consolidation. Four independent 16-bit ADCs provide precise and efficient management of multiple analog signals, which ultimately boosts system throughput. New sigma-delta peripherals enable isolated current shunt measurements and windowed comparators allow protection of power stage when current limit conditions are exceeded or not met. Other analog and control peripherals include digital-to-analog converters (DACs), PWMs, eCAPs, eQEPs, and other peripherals.

　　Peripherals such as dual EMIFs and dual ISO11898-1 (CAN 2.0B) extend the connectivity of the F2837xD. A USB 2.0 host port with MAC and PHY lets users easily add universal serial bus (USB) connectivity to their application.

　　TMS320F28377D主要特性:

　　Dual-Core Architecture

　　Two TMS320C28x 32-Bit CPUs

　　200 MHz

　　IEEE 754 Single-Precision Floating-Point

　　Trigonometric Math Unit (TMU)

　　Viterbi/Complex Math Unit (VCU-II)

　　Two Programmable Control Law Accelerators

　　200 MHz

　　IEEE 754 Single-Precision Floating-Point Executes Code Independently of Main CPU

　　On-Chip Memory

　　512KB or 1MB of Flash (ECC-Protected)

　　172KB or 204KB of RAM (ECC or Parity)

　　Dual-Zone Security Supporting Third-Party Development

　　Clock and System Control

　　Two Internal Zero-Pin 10-MHz Oscillators

　　On-Chip Crystal Oscillator and External Clock Input

　　Windowed Watchdog Timer Module

　　Missing Clock Detection Circuitry

　　1.2-V Core, 3.3-V I/O Design

　　System Peripherals

　　Two External Memory Interfaces (EMIFs) With ASRAM and SDRAM Support

　　Dual 6-Channel Direct Memory Access (DMA) Controller

　　Up to 169 Individually Programmable, Multiplexed General-Purpose Input/Output (GPIO) Pins With Input Filtering

　　HW Interrupt Controller

　　Multiple Low-Power Mode Support With External Wakeup

　　JTAG Emulation Connection

　　Communications Peripherals

　　USB 2.0 (MAC + PHY)

　　Two CAN-Bus Ports (Pin-Bootable)

　　Three High-Speed (40-MHz) SPI Ports

　　(Pin-Bootable)

　　Two Multichannel Buffered Serial Ports

　　Four Serial Communications Interfaces (SCIs) (Pin-Bootable)

　　Two I2C Interfaces (Pin-Bootable)

　　Analog Subsystem

　　Four Dual-Mode Analog-to-Digital Converters (ADCs)

　　16-Bit Mode

　　1.1 MSPS Each (up to 4.4-MSPS System)

　　Differential

　　Up to 12 External Channels

　　12-Bit Mode

　　3.5 MSPS Each (up to 14-MSPS System)

　　Single-Ended

　　Up to 24 External Channels

　　Single Sample-and-Hold (S/H) on Each ADC

　　HW Integrated Post-Processing of ADC Conversions

　　Saturating Offset Calibration

　　Error From Setpoint Calculation

　　High, Low, and Zero-Crossing Compare, With Interrupt Capability

　　Trigger-to-Sample Delay Capture

　　Eight Windowed Comparators With 12-Bit DAC References

　　Three 12-Bit Buffered DAC Outputs

　　Enhanced Control Peripherals

　　24 Pulse Width Modulator (PWM) Channels With Enhanced Features

　　16 High-Resolution Pulse Width Modulator (HRPWM) Channels

　　High Resolution on Both A and B Channels of 8 PWM Modules

　　Dead-Band Support (on Both Standard and High Resolution)

　　Six Enhanced Capture (eCAP) Modules

　　Three Enhanced Quadrature Encoder Pulse (eQEP) Modules

　　8 Sigma-Delta Filter Module (SDFM) Input Channels, 2 Parallel Filters per Channel

　　Standard SDFM Data Filtering

　　Comparator Filter for Fast Action for Out of Range

　　Package Options:

　　Lead-Free, Green Packaging

　　337-Ball New Fine Pitch Ball Grid Array (nFBGA) [ZWT Suffix]

　　176-Pin PowerPAD Thermally Enhanced Low-Profile Quad Flatpack (HLQFP) [PTP Suffix]

　　Temperature Options:

　　T: –40ºC to 105ºC Junction

　　S: –40ºC to 125ºC Junction

　　Q: –40ºC to 125ºC Free-Air

　　(Q100 Qualification for Automotive Applications)

　　TMS320F28377D应用:

　　• Industrial Drives

　　• Smart Metering

　　• Solar Micro Inverters and Converters

　　• Automotive Transportation

　　• Radar

　　• Power Line Communications

　　• Digital Power

　　• Software-Defined Radio

　　基于ΔΣ ADC和MCU的数据采集系统

　　This isolated data acquisition system based on an isolated delta-sigma (ΔΣ) modulator and a microcontroller can accurately measure currents in the -10 A to 10 A range when used with the appropriate current shunts. This circuit was designed to provide excellent galvanic isolation and accuracy targeted primarily for a current sensing application. The design provides dual functionality for a high resolution channel and an additional over-current or short-circuit detection channel.

　　The primary objective for this TI Precision Design is to create a isolated data acquisition system to meet the following specifications:

　　• Maximum current range in normal operation: 10 Apeak

　　• Uncalibrated accuracy (only for measurement of voltage drop across the shunt): 0.3% FSR

　　• Signal to noise ratio (SNR) at 1 kHz: 78dB

　　• Minimum sampling rate: 70 kSPS

　　• Minimum bandwidth: 20 kHz

　　• Supply level: 5 V

　　This Verified TI Design implements an isolated current sensing data acqusition solution based on the AMC1304M25 isolated delta-sigma (ΔΣ) modulator and a TMS320F28377D microcontroller. This circuit was designed for shunt-based current measurement applications which require excellent galvanic isolation and accuracy, such as industrial motor drives, photovoltaic inverters, and energy metering. It is capable of measuring load currents from -10 A to +10 A with better than 0.3% uncalibrated accuracy, and it also provides dual functionality of a high resolution channel and an additional over-current or short-circuit detection channel. The design’s functionality and performance were verified against the circuit design goals by fabricating three PCBs and measuring results for dc and ac input signals.

　　数据采集系统主要特性:

　　Verified Design contains theory, component selection, TINA-TI simulation, measured results, PCB layout, and modifications

　　Galvanically isolated current sensing solution

　　16-bit output at 78.1 kSPS

　　±10 A at <0.3% (uncalibrated accuracy)

　　78dB SNR (min)

　　图.TIPD165-隔离的分流检测参考设计外形图

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