MCP48CMB24 - Carte d'évaluation Microchip - Free user manual and instructions

USER MANUAL MCP48CMB24 Microchip

4-20 mA Current Loop

Evaluation Board

User's Guide

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© 2023, Microchip Technology Incorporated and its subsidiaries.

All Rights Reserved.

ISBN: 978-1-6683-3663-2

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Table of Contents

Chapter 1. Product Overview

1.1 Introduction ...... 7
1.2 Overview 7
1.3 Features 8
1.4 Contents 8
1.5 Requirements 8

Chapter 2. Installation and Operation

2.1 Operation 9
2.2 Configuration Requirements .... 10

Appendix A. Schematic and Layouts

A.1 Introduction 13
A.2 Board – Schematic 14
A.3 Board – Top Silk 15
A.4 Board – Top Copper and Silk 15
A.5 Board – Top Copper 16
A.6 Board – Bottom Copper 16
A.7 Board – Bottom Copper and Silk 17
A.8 Board – Bottom Silk 17
A.9 Board – Top View 18
A.10 Board – Bottom View 18

Appendix B. Bill of Materials (BOM)....21

NOTES:

Preface

NOTICE TO CUSTOMERS

All documentation becomes dated, and this manual is no exception. Microchip tools and documentation are constantly evolving to meet customer needs, so some actual dialogs and/or tool descriptions may differ from those in this document. Please refer to our website (www.microchip.com) to obtain the latest documentation available.

Documents are identified with a "DS" number. This number is located on the bottom of each page, in front of the page number. The numbering convention for the DS number is "DSXXXXXXXXA", where "XXXXXXXXX" is the document number and "A" is the revision level of the document.

For the most up-to-date information on development tools, see the MPLAB ^® IDE online help. Select the Help menu, and then Topics to open a list of available online help files.

INTRODUCTION

This chapter contains general information that will be useful to know before using the EV34C35A DAC-Based 4-20 mA Current Loop Evaluation Board. Items discussed in this chapter include:

• Document Layout
• Conventions Used in this Guide
• Recommended Reading
  • The Microchip Website
• Customer Support
  • Document Revision History

DOCUMENT LAYOUT

This document describes how to use the EV34C35A DAC-Based 4-20 mA Current Loop Evaluation Board to demonstrate the performance of the MCP48CMD2X device family. The manual layout is as follows:

• Chapter 1. “Product Overview” – Important information about the EV34C35A DAC-Based 4-20 mA Current Loop Evaluation Board.
• Chapter 2. “Installation and Operation” – Includes instructions on how to get started with the EV34C35A DAC-Based 4-20 mA Current Loop Evaluation Board.
• Appendix A. “Schematic and Layouts” – Shows the schematic and layout diagrams for the EV34C35A DAC-Based 4-20 mA Current Loop Evaluation Board.
• Appendix B. "Bill of Materials (BOM)" – Lists the parts used to build the EV34C35A DAC-Based 4-20 mA Current Loop Evaluation Board.

CONVENTIONS USED IN THIS GUIDE

This manual uses the following documentation conventions:

DOCUMENTATION CONVENTIONS

Description Represents Examples
Arial font:
Italic characters Referenced books	MPLAB	^ IDE User's Guide
	Emphasized text ...is the only compiler...
Initial caps A window the Output	window
	A dialog the Settings dialog
	A menu selection select Enable Programmer
Quotes A field name in a window or dialog		"Save project before build"
Underlined, Italic text with right angle bracket	A menu path File>Save	——
Bold characters	A dialog button	Click OK
	A tab	Click the Power tab
N'Rnnnn	A number in verilog format, where N is the total number of digits, R is the radix and n is a digit.	4'b0010, 2'hF1
Text in angle brackets <>	A key on the keyboard	Press,,
Courier New font:
Plain Courier New	Sample source code	#define START
	Filenames	autoexec.bat
	File paths	c:\mccl8\h
	Keywords	_asm, _endasm, static
	Command-line options	-0pa+, -0pa-
	Bit values	0, 1
	Constants	0xFF, 'A'
Italic Courier New	A variable argument	file.o, where file can be any valid filename
Square brackets []	Optional arguments	mccl8 [options] file [options]
Curly brackets and pipe character: { | }	Choice of mutually exclusive arguments; an OR selection	errorlevel {0|1}
Ellipses...	Replaces repeated text	var_name [, var_name...]
	Represents code supplied by user	void main (void) { ... }

RECOMMENDED READING

This user's guide describes how to use the EV34C35A DAC-Based 4-20 mA Current Loop Evaluation Board. Another useful document is listed below. The following Microchip document is available and recommended as a supplemental reference resource.

• DAC-Based 4-20 mA Current Loop Reference Design (DS50003623A)

THE MICROCHIP WEBSITE

Microchip provides online support via our website at www.microchip.com. This website is used as a means to make files and information easily available to customers. Accessible by using your favorite Internet browser, the website contains the following information:

• Product Support – Data sheets and errata, application notes and sample programs, design resources, user's guides and hardware support documents, latest software releases and archived software
• General Technical Support – Frequently Asked Questions (FAQs), technical support requests, online discussion groups, Microchip consultant program member listing
• Business of Microchip – Product selector and ordering guides, latest Microchip press releases, listing of seminars and events, listings of Microchip sales offices, distributors and factory representatives

CUSTOMER SUPPORT

Users of Microchip products can receive assistance through several channels:

• Distributor or Representative
- Local Sales Office
- Embedded System Engineer (ESE)
- Technical Support

Customers should contact their distributor, representative or field application engineer (FAE) for support. Local sales offices are also available to help customers. A listing of sales offices and locations is included in the back of this document.

Technical support is available through the website at: http://www.microchip.com/support.

DOCUMENT REVISION HISTORY

Revision A (December 2023)

- Initial release of this document.

NOTES:

Chapter 1. Product Overview

1.1 INTRODUCTION

This chapter provides an overview of the EV34C35A DAC-Based 4-20 mA Current Loop Evaluation Board and covers the following topics:

• Overview
• Features
• Contents
• Requirements

1.2 OVERVIEW

The EV34C35A DAC-Based 4-20 mA Current Loop Evaluation Board is designed to regulate the loop current according to the changes in the process variable value. Sensor output computed by the host controller (MCU) is provided through MCP48CMD21 a 12-bit 1 LSb DAC as an input to current loop transmitter. MCP4152 is an 8-bit digipot that provides an offset trimming option at 4 mA. The MCP1501 external voltage reference provides the precise output to DAC reference and helps to improve accuracy.

Loop current flows through the return wire in two-wire systems and it is necessary that the quiescent current of the transmitter and other devices in the loop is less than the minimum loop current. Appropriate current budgeting allows users to allocate alarms for system failures.

The following figures show the top and bottom side of the EV34C35A DAC-Based 4-20 mA Current Loop Evaluation Board.

U2 UDE C3 C2 C4 3.3V U1 C11 U3 R11 R11 SDI SCK S00 CS1 CS2 GND GND J2 J1 R35 R33 R21R12 R34 U5 C31 U4 J3.3 R32 R31 GND GND D4-11954-R1 60I 5CK 500 CS1 CS2 GND GND 3.3 MICROCHIP EU34C35A DAC based 4-20mA Current Loop Transmitter UK CA + - CE

FIGURE 1-1: Top Side and Bottom Side of EV34C35A.

J2 connector provides user an option to mount this small board at sensor side controller set up. This board can be a quick plug-in solution to transmit process variables like pressure, temperature, flow, etc. over a long distance.

1.3 FEATURES

The EV34C35A DAC-Based 4-20 mA Current Loop Evaluation Board features:

• Highly-accurate 4-20 mA current signal
- Current budgeting with room to allocate different system level alarms
- Offset adjustment
- Cost-effective solution

1.4 CONTENTS

The EV34C35A DAC-Based 4-20 mA Current Loop Evaluation Board includes the following devices:

• MCP1792-3302: 3.3V, 100 mA high-voltage LDO to convert 24V supply into 3.3V which is used as an on-board V_DD
• MCP1501-25: 2.5V high-precision buffered voltage reference which acts as an external reference for DAC
• MCP48CMD21: Single channel, 1 LSb INL, 12-bit DAC which provides 0 to 2.5V output
• MCP4152-503: 8-bit single-channel digipot to adjust and precisely set low scale current of 4mA when DAC output is 0V
• MCP6021: Single-channel, Rail-to-Rail Input/Output, 10 MHz op amp
  • 2N7002: N-Channel Enhancement-Mode Vertical DMOS FET

1.5 REQUIREMENTS

The EV34C35A DAC-Based 4-20 mA Current Loop Evaluation Board requires:

• External +24V DC Power Supply
- Two-wire loop
- External controller board

Chapter 2. Installation and Operation

2.1 OPERATION

The EV34C35A DAC-Based 4-20 mA Current Loop Evaluation Board is intended to demonstrate the performance of 4-20 mA current loop with MCP48CMD21 DAC. Block diagram of the 4-20 mA current loop transmitter is shown below.

graph TD
    MCU -->|SPI| DigiPotMCP4152
    MCU -->|SPI| DACMCP48CMD21
    DACMCP48CMD21 --> OPAMPMCP6021
    OPAMPMCP6021 --> MOSFET2N7002-G
    MOSFET2N7002-G --> PowerSupply24V
    PowerSupply24V --> 4-20mALoop["4-20mA Loop"]
    Receiver --> MOSFET2N7002-G
    TransmitterPowerSupplyMCP1792 --> VREFMCP1501
    TransmitterPowerSupplyMCP1792 --> DACMCP48CMD21
    TransmitterPowerSupplyMCP1792 --> DigiPotMCP4152
    TransmitterPowerSupplyMCP1792 --> VREFMCP1501
    TransmitterPowerSupplyMCP1792 --> DACMCP48CMD21
    TransmitterPowerSupplyMCP1792 --> DigiPotMCP4152
    TransmitterPowerSupplyMCP1792 --> MOSFET2N7002-G

FIGURE 2-1: Block Diagram.

DAC based 4-20 mA current loop transmitter accepts DAC voltage and converts it to a current in such a way that relation between input process variable and output loop current is linear. Sensor output is converted into digital signal and provided through 12-bit 1 LSb DAC as an input to current loop transmitter. 8-bit digipot provides an offset trimming option at the lower end of current. External voltage reference provides the precise output to DAC reference and helps to improve accuracy. All the devices including voltage regulator, voltage reference, DAC, digipot and op amp return paths are connected to the on-board local ground which is different than the 24V power supply ground. For two-wire systems, it is necessary that the quiescent current of the transmitter and other devices in the loop is less than the minimum required loop current. Appropriate current budgeting allows users to allocate alarms for system failures.

2.2 CONFIGURATION REQUIREMENTS

In two-wire loop configurations, an ammeter can be placed in series with power supply to measure the loop current. Users can apply the 4-20 mA current to the receivers or display modules as per the need of applications. The following figure shows a test set up for the EV34C35A.

graph LR
    A["EV34C35A Transmitter Board"] --> B["J1"]
    B --> C["Ammeter"]
    C --> D["24V DC Power Supply"]
    C --> E["-"]
    C --> F["+"]

FIGURE 2-2: 4-20 mA Current Loop Transmitter Board System Setup.

Performance of two-wire 4-20 mA current loop using EV34C35A board can be demonstrated with the following steps:

1. Connect +24V DC supply in series connection with Ammeter to the EV34C35A board as shown in Figure 2-2, making sure that DC power supply is OFF,
2. Connect the SDI, SCK, SDO, CS1, CS2, GND, 3.3 pins of J2 connector on EV34C35A to microcontroller board.

3.3V U2 VREF C3 C2 C4 R1 C5 C1 U1 C11 U3 J2 SDI SCK SDO CS1 CS2 GND GND 3.3 Q1 R11 R35 R33 R21R12 U4 R34 R32 R31 U5 C31 C21 GND GND

FIGURE 2-3: J2 Connector.

1. For example, the following image shows the EV34C35A connection to MCU test board.

Green printed circuit board with integrated circuits and labeled components (no readable text or symbols)

FIGURE 2-4: MCU Transmitter.

1. Program the controller to communicate with the DAC and digipot of EV34C35A board using SPI communication protocol.
2. Chip select CS1 is used for communicating with DAC and chip select CS2 is used for communicating with digipot.

3.3U U2 UREF C3 C2 C4 R1 C5 J2 C1 U1 C11 U3 DAC SDI SCK SD0 R11 CS1 C52 GND GND 3.3 Q1 R35 R33 R21R12 Digi Pot U4 R34 U5 C31 C21 R32 R31 GND GND

FIGURE 2-5: Chip Select.

1. DAC output range is from 0V - 2.5V to get 4 mA - 20 mA current respectively.
2. Digipot is used for trimming the current at 4 mA to get precise output.

NOTES:

Appendix A. Schematic and Layouts

A.1 INTRODUCTION

This appendix contains the following schematics and layouts for the EV34C35A DAC-Based 4-20 mA Current Loop Evaluation Board:

• Board – Schematic
• Board – Top Silk
• Board – Top Copper and Silk
• Board – Top Copper
• Board – Bottom Copper
  • Board – Bottom Copper and Silk
• Board – Bottom Silk
• Board – Top View
• Board – Bottom View

A.2 BOARD - SCHEMATIC

LDO: 3.3V, 100mA (3 lead SO1-23A) MCP1/21-33/20/23 U1 VOUT GND C1 2.2kF 14kV 12.5 C2 2.2kF 16kV 80Ω C3 1.2kV 1.5kV 1.5kV 1.5kV

Digi Pot: 8-Bit Single Digital POT with NVM and SPI (DFN-8)

U4 5 VDD 2 VDC SD 3 VDC 6 VDD 10V 10V 10V 10V C21 2V 7 SD0 6 FOS 5 FOS 4 FOS 1.1V 10V 10V 10V 10V 10V 10V 10V 10V 10V 10V 10V 10V 10V 10V 10V 10V 10V 10V 10V 10V 10V 10V 10V 10V 10V 1.1V

MCU Connector

DAC: 12-bit, Single channel, SPI (MSOP-10) VOUT VREF GND VREF GND VREF GND VREF GND VREF GND VREF GND VREF GND VREF GND VREF GND VREF GND VREF GND VREF GND VREF GND VREF GND VREF GND VREF GND VREF GND VREF

OPAMP: Single channel rail to rail input/output (5 lead SOT-23)

GND 100V 100V 0.1V GND 2.3A 0.2A 1V U5 MΩ, 100Ω R12 CM R38 1.8kΩ 0.21 1V O1 24V(200A) R34 0.95 LW 1V R33 28V 15V R32 28V 15V GND

VREF: 2.5V, 50ppm (6 lead SOT-23)

MCP-100V, 2.5kV 172 VDD 1 R1 3.5V 0.5V 0.5V 2.5V 1.1µF 2V GND 45 2.5V 16V 100V

A.3 BOARD - TOP SILK

C1 C2 C4 U2 R1 C5 U1 C11 U3 SDI SCK SDO CS1 CS2 GND GND 3.3 Q1 + - R35 R33 R21 R12 R34 U5 C31 U4 R32 R31 C21

A.4 BOARD – TOP COPPER AND SILK

C1 C2 C4 U2 R1 C5 U1 C11 U3 SDI SCK SD0 R11 CS1 R35 R33 R21R12 R34 R32 R31 U5 C31 U4 C21 GND 3.3

A.5 BOARD - TOP COPPER

Pure electrical circuit lines without any symbols

A.6 BOARD - BOTTOM COPPER

Pure electrical circuit lines without any symbols or text, numbers, or labels

A.7 BOARD - BOTTOM COPPER AND SILK

04-11954-R1 SDI SCK SDO CS1 CS2 GND GND 3.3 MICROCHIP EU34C35A DAC based 4-20mA Current Loop Transmitter UK CA + - CE

A.8 BOARD - BOTTOM SILK

SDI SCK SDO CS1 CS2 GND GND 3.3 MICROCHIP EV34C35A DAC based 4-20mA Current Loop Transmitter + - CE UK CA 50°

A.9 BOARD - TOP VIEW

3.3V U2 UREF C3 C2 C4 R1 C5 J2 C1 U1 C11 U3 SDI SCK SD0 R11 CS1 CS2 GND GND 3.3 + - Q1 R35 R33 R21R12 U4 R34 R32 R31 U5 C31 C21 GND GND

A.10 BOARD - BOTTOM VIEW

04-11954-R1 SDI SCK SDO CS1 CS2 GND GND 3.3 MICROCHIP EU34C35A DAC based 4-20mA Current Loop Transmitter UKCA + - CE

Appendix B. Bill of Materials (BOM)

TABLE B-1: BILL OF MATERIALS (BOM)

Qty.	Reference Description Manufacturer Part Number
1	C1	Capacitor, ceramic, 2.2 μF, 100V, 10%, X7R, SMD, 1210	SamsungElectro-MechanicsAmerica, Inc.	CL32B225KCJSNNE
2	C2, C5	Capacitor, ceramic, 2.2 μF, 16V, 10%, X5RSMD 0603	TDK Corporation C1608	X5R1C225K080AB
0 C3	Capacitor, ceramic, 0.1 μF, 25V, 10%, X7RSMD 0603 – Do Not Populate		KEMET C0603C104K3	RAC7013
4 C4, C11, C21, C31		Capacitor, ceramic, 0.1 μF, 25V, 10%, X7RSMD, 0603	KEMET C0603C104K3	RAC7013
1 J1	Connector, terminal, 3.81mm, 1x2 female, 16-30AWG, 13.5A, TH, R/A		Phoenix Contact	1727010
1 J2	Connector, header-2.54, Male, 1x8, gold, 5.84MH, TH, R/A		Sullins Connector Solutions	PBC08SBAN
1 LABEL Label, PCBA, 6x6mm, info, text ACT Logimark AS 505462
1 PCB1	Printed Circuit Board – EV34C35A DACBased 4-20 mA Current Loop Evaluation Board		MicrochipTechnology Inc.	04-11954-R1
1 Q1	Microchip, Analog, MOSFET, N-Channel, 2N7002-G, 60V, 115mA, SOT-23-3		MicrochipTechnology Inc.	2N7002-G
1	R1	Resistor, TKF, 51R, 5%, 1/10W, SMD, 0603	Panasonic® – ECG	ERJ-3GEYJ510V
1	R11	Resistor, TKF, 100 kΩ, 5%, 1/10W, SMD, 0603, AEC-Q200	Panasonic – ECG	ERJ-3GEYJ104V
1	R12	Resistor,TKF,15 kΩ,0.1%,1/10W,SMD0603	Panasonic – ECG	ERA-3AEB153V
1	R21	Resistor, TKF,47 kΩ, 1%, 1/10W, SMD, 0603	Panasonic – ECG	ERJ-3EKF4702V
1	R31	Resistor, TKF, 2.2 kΩ, 1%, 1/10W, SMD, 0603	Panasonic – ECG	ERJ-3EKF2201V
2	R32, R33	Resistor, TKF, 22R, 1%, 1/10W, SMD, 0603	Panasonic – ECG	ERJ-3EKF22R0V
1	R34	Resistor, TKF, 249R, 1%, 1/4W, SMD, 1206	ROHM Semiconductor	MCR18EZHF2490
1	R35	Resistor, TKF, 1.8 kΩ, 1%, 1/10W,SMD,0603	Panasonic – ECG	ERJ-3EKF1801V
0	3.3V, TP1, TP2, VREF	C0nrector, TP loop, red, TH – Do NotPopulate	Keystone®Electronics Corp.	5010
1 U1	Microchip, Analog, voltage regulator, 3.3V, 3 Lead, MCP1792T-3302H/CB, SOT-23A-3		MicrochipTechnology Inc.	MIC9136
1 U2	Microchip, Analog, VREF, 2.50V, MCP1501T-25E/CHY, SOT-23-6		MicrochipTechnology Inc.	MCP1501T-25E/CHY
1 U3	Microchip, Analog, DAC, 1-Channel, 12-bit, MCP48CMD21T-E/UN, MSOP-10		MicrochipTechnology Inc.	MCP48CMD21T-E/UN
1 U4	Microchip, Analog, Digipot, 50 K Ohm, 257TAP, 8MSOP		MicrochipTechnology Inc.	MCP4152T-503E/MS
1 U5	Microchip, Analog, Op Amp, 1-Channel, 10 MHz, MCP6021T-E/OT, SOT-23-5		MicrochipTechnology Inc.	MCP6021T-E/OT

NOTES:

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