Texas Instruments INA220 Bedienungsanleitung

EVM User's Guide: INA220EVM

INA220 Evaluation Module

Description

The INA220 evaluation module (EVM) is a platform

to evaluate the main features and performance of the

INA220. The EVM supports current measurements up

to 10-A and comes with graphical user interface (GUI)

support to read and write to device registers.

Get Started

1. Buy the INA220EVM evaluation board.

2. Buy the TI-SCB sensor control board.

3. Download and install the PAMB Windows USB

Drivers.

4. Read this User's Guide to set up the hardware.

5. Run the INA220EVM-GUI.

Features

• GUI support to read and write device registers as

well as view and save results data

• EVM detached from SCB for custom use cases

• Multiple EVM support with single SCB/GUI

• Conveniently powered from a common micro-USB

connector through the SCB

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INA220 Evaluation Module 1

1 Evaluation Module Overview

1.1 Introduction

The EVM is an easy-to-use platform for evaluating the main features and performance of the INA220. The EVM

supports current measurements up to 10 amps through the PCB, and includes a graphical user interface (GUI)

used to read and write device registers as well as view and save results data.

This user’s guide describes the characteristics, operation, and use of the INA220 evaluation module (EVM).

This EVM is designed to evaluate the performance of the INA220. Throughout this document, the terms

evaluation board, evaluation module, and EVM are synonymous with the INA220EVM. This document includes a

schematic, reference printed circuit board (PCB) layouts, and a complete bill of materials (BOM).

1.2 Kit Contents

Table 1-1 lists the contents of the EVM kit. Contact your nearest Texas Instruments Product Information Center if

any component is missing.

Table 1-1. Kit Contents

ITEM QUANTITY

INA220EVM test board 1

Note that this EVM requires the TI Sensor Control Board (SCB), which is sold separately.

1.3 Specification

The EVM is intended to provide basic functional evaluation of the device. The layout is not intended to be a

model for the target circuit, nor laid out for electromagnetic compatibility (EMC) testing. The EVM consists of

two printed-circuit boards (PCBs). The larger PCB is referred to as the EVM, and has the INA220 installed. The

smaller PCB is referred to as the SCB Controller, and is used to interface the EVM with the GUI.

1.4 Device Information

The INA220 is a current shunt and power monitor with an I2C- or SMBUS-compatible interface. The INA220

monitors both shunt drop and supply voltage. A programmable calibration value, combined with an internal

multiplier, enables direct readouts in amperes. An additional multiplying register calculates power in watts. The

I2C- or SMBUS-compatible interface features 16 programmable addresses. The separate shunt input on the

INA220 allows to be used in systems with low-side sensing.

The INA220 is available in two grades: A and B. The B grade version has higher accuracy and higher precision

specifications.

The INA220 senses across shunts on buses that can vary from 0 to 26 V, useful for low-side sensing or CPU

power supplies. The device uses a single 3- to 5.5-V supply, drawing a maximum of 1 mA of supply current. The

INA220 operates from –40°C to 125°C.

Table 1-2. Device Summary

PRODUCT

DIGITAL

PROTOCOL

ADC

RESOLUTION

MAX GAIN

ERROR

MAX OFFSET

VOLTAGE

INA220 I2C 12-bit 0.3%, 0.5% ±50 µV, ±100µV

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2 Hardware

2.1 Quick Start Setup

The following instructions describe how to set up and use the EVM.

1. Purchase an SCB if user does not have one.

a. To use a PAMB Controller instead, see PAMB Compatibility.

2. Download this driver and install as an administrator: https://www.ti.com/lit/zip/sbac253.

a. Follow the download prompts, a myTI account is required.

b. Note that this driver is labeled as a PAMB driver, but is also used for the SCB.

3. Attach the EVM to the SCB Controller as shown in Figure 2-1.

a. Refer to Figure 2-2 when connecting multiple EVMs of the same type together.

4. Connect the EVM to the PC using the provided USB cable.

a. Insert the micro USB cable into the SCB Controller onboard USB receptacle J2.

b. Plug the other end of the USB cable into a PC.

5. Access the GUI from this link in either Chrome, Firefox, or Safari: https://dev.ti.com/gallery/info/

CurrentSensing/INA220EVM_GUI/.

6. Connect the GND reference of the external system to the GND node of the EVM (pin 1 of J1).

7. Provide a differential input voltage signal to the IN+ and IN– nodes by connecting the signal leads to J1 pin 5

or 6 and J1 pin 3 or 4 on the EVM as explained in Current Sensing Operation.

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INA220 Evaluation Module 3

2.2 EVM Operation

To use the EVM with the SCB Controller (sold separately), connect the EVM as shown in Figure 2-1.

Figure 2-1. EVM (Left) Connected to SCB Controller (Right)

If using multiple EVMs, then connect them as shown in Figure 2-2. Make sure to use a different I2C address for

each device. The GUI only supports up to 4 EVMs total.

Figure 2-2. Multiple EVMs Connected to SCB Controller

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2.2.1 Current Sensing Operation

The EVM can be used with either an onboard or external shunt resistor. To use the onboard shunt resister,

solder a 2512 surface-mount technology (SMT) shunt resistor across the pads of R1, and connect in series

with the external system and load current through J1. An external shunt can be connected directly across

the terminals of J1. There are two terminals each for IN+ (J1 pins 5 and 6) and IN– (J1 pins 3 and 4) for

convenience.

2.2.1.1 Detailed Setup

To configure a measurement evaluation, follow these steps:

1. Connect a shunt resister by doing either of the following:

a. Solder a 2512 resistor across the pads of R1 that connects the IN+ and IN– inputs.

b. Connect an external shunt across the IN+ and IN– terminals of J1, preferably across pins 4 and 5, as

shown in Figure 2-3 and Figure 2-4.

i. If an external shunt is being used, then make the connections such that the sensing location is

across the shunt and there is no high current on the sensing path. See the TI Precision Labs -

Current Sense Amplifiers: Shunt Resistor Layout video for more information.

2. Connect the IN+ and IN– terminals in series with the load while powered off.

a. When measuring more than 10 A, make sure the high current path does not go through the EVM

(including the terminal block J1), as shown in Figure 2-3.

Load Current Line IN+ Load Current Line IN-

Figure 2-3. IN+ and IN– Wiring for More Than 10 A

b. When using 10 A or less with either an onboard or external shunt, the current path can be passed

through the EVM. Figure 2-4 shows a convenient way to use the multiple IN+ and IN- terminals with an

external shunt for this use case.

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INA220 Evaluation Module 5

Load Current Line IN+ Load Current Line IN-

Figure 2-4. IN+ and IN– Wiring for 10 A or Less

WARNING

When measuring current, first make sure that the equipment (shunt resistor, wires,

connectors, and so on) can support the amperage and power dissipation. Secondly, make

sure that the current flowing through J1 does not exceed 10 A. Failure to do so can result in

damage to the EVM, or personal injury.

The EVM can get hot.

3. Connect the VBUS terminal (J1 pin 2) to the desired bus voltage (likely either IN+ or IN–).

a. If VBUS and dependent features are not being used, then this channel can be used as an ADC input for

another voltage.

4. Connect the system ground to the GND terminal (J1 pin 1).

5. Power on the system, and observe the device states and outputs through the GUI.

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2.3 Circuitry

This section summarizes the EVM subsystems and their components.

2.3.1 Current Sensing IC

This section describes the INA220 and supporting components.

U1 is the INA220 current-sensing device. C1 and C2 are bypass capacitors that are placed near the sensor to

help mitigate power supply noise and provide current quickly to the device when needed. LED D1 with current

limiting resistor R4 are used to indicate when the EVM is powered on.

The device pins can be monitored directly through the test points TP1 – TP11. Note that there are two extra test

points on GND for convenience.

2.3.2 Input Signal Path

This section describes the circuitry of the input signal path.

J1 is the main connection terminal. Pin 1 of J1 is used to tie the system ground to the EVM ground. Pin 2 of J1

is used for the VBUS measurement within the sensor. Pins 3 and 4 are tied to IN–, and Pins 5 and 6 are tied to

IN+. There are two pins each for IN– and IN+ for convenience.

R1 can be used for an optional onboard shunt resistor with a 2512 footprint. Alternatively, a shunt can be placed

across the IN+ and IN– terminals of J1. If desired, a differential voltage can be applied directly for measurement

tests.

C3, R2, and R3 combine to make an optional input filter. R2 and R3 are populated with 0-Ω resistors by default.

When using input filtering, take into account the input bias current of the device. C3 can also be used without R2

and R3 to reduce noise. See the data sheet for more info on input filtering.

2.3.3 Digital Circuitry

This section describes the digital circuitry around the device.

J2 and J3 are the main header pins that connect the digital and power pins to the SCB Controller or other EVMs.

J3 connects to the EVM/SCB on the right, while J2 connects to more EVMs on the left. R5 and R6 are used as

pullup resistors for the main digital IO pins.

SW0 and SW1 set the I2C address of the device. This can be useful when using the EVM with a custom

controller (other than the SCB Controller), or when connecting multiple EVMs together. Currently the SCB

Controller and GUI are set up to use four EVMs at a time.

2.4 PAMB Compatibility

If desired, then this EVM and GUI can be used with the PAMB Controller (DC081A) by jumper wiring the pin

headers of the PAMB to the EVM. Figure 2-5 shows which pins on the PAMB correspond to the EVM header

pins. Note not to add too much resistance in the jumper wire connection setup or the signal can degrade and

cause communication errors.

Figure 2-5. EVM to PAMB Connection

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3 Software

3.1 Setup

3.1.1 Driver Installation

Download and install this driver: https://www.ti.com/lit/zip/sbac253. This is a one-time step per computer, and

requires a myTI account. Note that this driver is labeled as a PAMB driver, but is also used for the SCB. Unzip

the folder and run the .exe file with administrator privileges.

3.1.2 Firmware

Firmware updates are pushed through the GUI if the previous driver was installed. If the GUI is downloaded for

offline use, then the GUI can only update the SCB controller with the latest firmware available at the time of

download. To check for the latest GUI or Firmware updates, launch the latest GUI version from the web browser.

3.1.2.1 Firmware Debug

If the firmware must be manually reinstalled for any reason, then follow these steps to reinstall the firmware.

Make sure the EVM is connected to the SCB before being powered on.

1. First, see if the GUI can program the firmware.

a. Plug in the SCB controller to the PC.

i. Make sure the EVM is connected to the SCB first.

b. Launch the GUI and close the README.md window.

c. If the MCU is already in Device Firmware Update (DFU) mode, then there will be a popup window saying

"Connection Failure - No SCB controller deteted".

i. Close this window.

d. If the GUI does not update automatically, then go to File > Program Device...

i. If the Program Device... button is grayed out, then click the connect button in the lower left corner

and then try again.

2. If step 1 is unsuccessful (or if the Program Device... button is still grayed out), then manually configure the

MCU on the SCB Controller to be in DFU Mode. This can be done through either of the below methods with

the SCB Controller powered on:

a. Through software:

• Send the command 'bsl' on the SCB's USB Serial (COM) port.

b. Though hardware:

• For safety, turn off and disconnect all load sources and external voltages.

• While shorting the two test points labeled DFU (shown in Figure 3-1) with a pair of tweezers (or wire),

press and release the RESET button.

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Figure 3-1. Test Points Used to Enter DFU Mode Manually

• If the PAMB board is being used instead, then these test points are located near PK1 and PK2.

With the MCU in DFU mode, the firmware can now be uploaded through the method outlined in Step 1.

3.1.3 GUI Setup and Connection

You can access the GUI from this link in either Chrome, Firefox, or Safari: https://dev.ti.com/gallery/info/

CurrentSensing/INA220EVM_GUI/.

3.1.3.1 Initial Setup

To set up the GUI the first time:

1. Make sure that the previously mentioned driver was installed successfully so that everything works properly

and that the GUI can update the EVM firmware, if necessary.

2. Check to make sure the EVM and SCB controller unit is plugged into the PC, then go to the previously-

provided GUI link.

a. Verify that the EVM is connected to the SCB before plugging the SCB into a USB port.

3. Open the GUI Composer application to launch the GUI from the web browser (see Figure 3-2).

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INA220 Evaluation Module 9

Figure 3-2. GUI Composer Application

a. The GUI link brings up all versions of the GUI. TI recommends launching the newest version available.

b. For first-time GUI Composer setup, follow the prompts to download the TI Cloud Agent and browser

extension (see Figure 3-3). These prompts appear after the user closes the README.md dialog box.

Figure 3-3. TI Cloud Agent

4. Optionally, to download the GUI for offline use, click the icon in the GUI Composer application and follow

the prompts (see Figure 3-2).

3.1.3.2 GUI to EVM Connection

To connect the GUI to the EVM, follow these steps:

1. Setup and launch the GUI as described in Initial Setup.

a. Make sure to connect the EVM to the SCB before powering on.

2. Close the README.md file page to initiate a connection between the EVM and the GUI. If successful, then

the text Hardware Connected is visible near the bottom left corner of the GUI.

Figure 3-4. Hardware Connected

a. A green indicator with the device type and the text DEVICE CONNECTED is also visible near the top left

of the GUI.

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