Texas Instruments F280025C Manual de usuario

User’s Guide

TMS320F280025C controlCARD Information Guide

Cody Watkins

ABSTRACT

The F280025C controlCARD (TMDSCNCD280025C) from Texas Instruments (TI) provides a great way to

learn and experiment with F28002x devices. The F28002x devices are members of TI’s C2000™ family of

microcontrollers (MCUs). This 120-pin controlCARD is intended to provide a well-filtered robust design that

is capable of working in most environments. This document provides the hardware details of the F280025C

controlCARD and explains the functions, locations of jumpers, and connectors present on the board.

Table of Contents

1 Introduction.............................................................................................................................................................................2

2 Hardware Quick Setup Guide................................................................................................................................................ 3

3 Errata....................................................................................................................................................................................... 4

3.1 Warnings, Notes, and Errata..............................................................................................................................................4

3.2 Warnings About Specific controlCARD Revisions..............................................................................................................4

4 Getting Familiar With the controlCARD................................................................................................................................5

4.1 F280025C controlCARD Features..................................................................................................................................... 5

4.2 Assumed Operating Conditions......................................................................................................................................... 5

4.3 Using the controlCARD...................................................................................................................................................... 5

4.4 Experimentation Software.................................................................................................................................................. 6

5 Special Notes.......................................................................................................................................................................... 7

5.1 XDS100v2 Emulator and SCI (UART) Connectivity...........................................................................................................7

5.2 Clocking Methodology........................................................................................................................................................7

5.3 Evaluation of the Analog-to-Digital Converters (ADCs)..................................................................................................... 7

6 Hardware References............................................................................................................................................................. 9

7 Revision History................................................................................................................................................................... 12

List of Figures

Figure 1-1. F280025C controlCARD............................................................................................................................................2

Figure 5-1. Female SMA Connector............................................................................................................................................ 8

Figure 6-1. Key Components on the controlCARD - Front.......................................................................................................... 9

Figure 6-2. Key Components on the controlCARD - Back.........................................................................................................10

List of Tables

Table 4-1. Emulator Switch Selections........................................................................................................................................ 5

Table 6-1. Hardware Connections............................................................................................................................................. 10

Table 6-2. S4, Bootmode Selection Table..................................................................................................................................12

Trademarks

C2000™ and Code Composer Studio™ are trademarks of Texas Instruments.

All trademarks are the property of their respective owners.

www.ti.com Table of Contents

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TMS320F280025C controlCARD Information Guide 1

1 Introduction

Figure 1-1. F280025C controlCARD

Each controlCARD comes with a Hardware Developer’s Kit, which is a full set of files necessary to evaluate and

develop with a C2000 device. These files include:

• Schematics – Designed in Altium

• Bill of Materials (BOM)

• Layout PCB files - Designed in Altium

• Gerber files

The Hardware Developer's Kit for the controlCARD can be found in the C2000Ware at the following location:

• <install_directory>\c2000\C2000Ware_x_xx_xx_xx\boards\controlCARDs\TMDSCNCD280025C\Revx

Note

This kit is designed to explore the functionality of F28002x microcontrollers. The controlCARD can

be treated as a good reference design; it is not intended to be a complete customer design. Full

compliance to safety, EMI/EMC, and other regulations are left to the designer of the customer’s

system.

Introduction www.ti.com

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2 Hardware Quick Setup Guide

WARNING

When the controlCARD is used in a high-voltage setup, it is the user’s responsibility to confirm that

the voltages and isolation requirements are identified and understood prior to energizing the board

or simulation. When energized, the controlCARD or components connected to the controlCARD

should not be touched. Furthermore, the capacitor C26:A should be removed to minimize the

possibility of leakage current flowing across the isolation barrier of the controlCARD.

1. Connect and power embedded emulator.

a. Connect USB-B "mini" connector to J1:A

2. Provide power to the isolated F280025C device.

a. Insert the TMDSCNCD280025C controlCARD into a TMDSHSECDOCK, or other compatible docking

station.

b. Connect USB-B "mini" connector to J17 of the TMDSHSECDOCK.

c. Flip S1 to the "USB-ON" position. D3 of the controlCARD should illuminate.

3. For a detailed explanation of the hardware configuration, see Section 4.3.

www.ti.com Hardware Quick Setup Guide

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TMS320F280025C controlCARD Information Guide 3

3 Errata

Current revision of controlCARD as of 3/20/2020: PCB rev - A , ASSY rev - none

3.1 Warnings, Notes, and Errata

• The F280025C Experimenter’s Kit ships with a USB cable and is designed to be powered via USB. However,

in extreme cases the board/controlCARD may require more power than the 5 V @ 500 mA (USB 3.0 - 900

mA) that a computer’s USB port can provide. This is especially true when additional circuitry has been added

to the docking station. In such cases, it is recommended to use an external 5 V power supply (2.5 mm inner

diameter x 5.5 mm outer diameter) and plug it into J1. A compatible supply such as:

– Phihong PSAC05R-050(P)-R-C2 + Phihong RPBAG

3.2 Warnings About Specific controlCARD Revisions

MCU072E1

• 1.2-V and 3.3-V monitor pins (HSEC pins 118 and 119, respectively) were not implemented

MCU072A

• None

Errata www.ti.com

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4 Getting Familiar With the controlCARD

4.1 F280025C controlCARD Features

•F280025C Microcontroller – High performance C2000 microcontroller is located on the controlCARD.

•120-pin HSEC8 Edge Card Interface – Allows for compatibility with all of C2000’s 180-pin controlCARD-

based application kits and controlCARDs. Compatibility with 100-pin controlCARDs can be accomplished

using the TMDSADAP180TO100 adapter card (sold separately).

•Built-in Isolated JTAG Emulation – An XDS100v2 emulator provides a convenient interface to Code

Composer Studio™ without additional hardware. Flipping a switch allows an external JTAG emulator to be

used.

•Connectivity – The controlCARD contains connectors that allow the user to experiment with isolated

universal asynchronous receiver/transmitter (UART)/SCI with the F280025C MCU.

•Key Signal Breakout – Most GPIO, analog-to-digital converter (ADC) and other key signals routed to hard

gold connector fingers.

•Robust Power Supply Filtering – Single 5 V input supply powers an on-card 3.3 V LDO. All MCU inputs are

then decoupled using LC filters near the device.

•ADC Clamping – ADC inputs are clamped by protection diodes.

•Anti-Aliasing Filters – Noise filters (small RC filters) can be easily added on ADC input pins.

4.2 Assumed Operating Conditions

This kit is assumed to run at standard room conditions. Standard ambient temperature and pressure (SATP) with

moderate-to-low humidity is assumed.

4.3 Using the controlCARD

In order for the controlCARD to operate, the controlCARD’s MCU must be powered. This is most often done

by inputting 5 V through the HSEC connector via an accompanying baseboard. For example, if using a

TMDSHSECDOCK docking station baseboard, 5 V DC should be input into the docking station’s J1 or J17.

Then, S1 needs to be toggled to the appropriate position.

Based on the way the controlCARD is used, additional hardware settings will be necessary (see Table 4-1).

WARNING

When the controlCARD is used in a high-voltage setup, it is the user’s responsibility to confirm that

the voltages and isolation requirements are identified and understood prior to energizing the board

or simulation. When energized, the controlCARD or components connected to the controlCARD

should not be touched. Furthermore, the capacitor C26:A should be removed to minimize the

possibility of leakage current flowing across the isolation barrier of the controlCARD.

Table 4-1. Emulator Switch Selections

Debug Using CCS and the On-

Card XDS100v2 Emulator

Debug Using CCS and an

External Emulator via the

Baseboard

Standalone (Boot From FLASH

or Other Boot Mode)

S1:A Position 1: ON (up) Position 1: OFF (down) Position 1: OFF (down)

J1:A Connect a mini USB cable

between J1:A and your computer.

In CCS, use this target

configuration: TMS320F280025C

device with an XDS100v2

emulator.

--- ---

S4 Position 1: up- Logic 1

Position 2: down- Logic 0

Putting the C2000 device into

Wait Mode can reduce the risk of

connectivity issues.

Position 1: down- Logic 1 Position

2:up- Logic 0 Putting the C2000

device into Wait Mode can reduce

the risk of connectivity issues.

Set S4 as desired

Baseboard’s JTAG connector

(J2 on Docking Station)

--- Connect an external emulator. ---

www.ti.com Getting Familiar With the controlCARD

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TMS320F280025C controlCARD Information Guide 5

Code Composer Studio is an Integrated Development Environment (IDE) used to debug and develop software

for the C2000 series of MCUs. It can be downloaded from the following link: https://www.ti.com/tool/ccstudio.

The following PDF documents are provided, as part of C2000Ware, to describe where each of the F280025C

MCU’s pins will appear on the controlCARD connector/docking station:

•TMDSCNCD280025C_120cCARD_map– Tells where each MCU pin will go on the HSEC controlCARD

connector or the 120/180-pin controlCARD docking station.

•TMDSCNCD280025C_100DIM_map – Tells where each MCU pin will go to on the DIM100 controlCARD

connector or the DIM100 docking station. This assumes that the TMDSADAP180TO100 adapter card is

used.

More information on the controlCARD docking station can be found at the following location:

• <install directory>\c2000\C2000Ware_x_xx_xx_xx\boards\controlCARDs\TMDSCNCD280025C\Rx_x

4.4 Experimentation Software

Code Composer Studio (CCS) Integrated Development Environment (IDE) is recommended for developing and

debugging software for the C2000 series of MCUs. CCS is free to download and use with the controlCARD.

Introductory videos for CCS are available at training.ti.com.

C2000Ware contains a full suite of example software designed to work with the F280025C controlCARD.

This software package includes many example projects that allow the user to experiment with the ADC, PWM,

and other C2000 peripherals.

Support files for both register-level and driver-level programming are included with C2000Ware:

• Register header files are located at: \ti\c2000\C2000Ware_XXXX\device_support\F28002x\examples

• Driverlib programming examples are located at: \ti\c2000\C2000Ware_XXXX\driverlib\F28002x\examples

For users new to C2000’s F28002x series of devices and CCS, TI’s C2000 Academy provides several easy-to-

follow training modules and hands-on lab exercises to help users get started quickly.

Getting Familiar With the controlCARD www.ti.com

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5 Special Notes

5.1 XDS100v2 Emulator and SCI (UART) Connectivity

The F280025C controlCARD provides emulation and USB-to-UART adapter functionality on the controlCARD.

This allows for a convenient method to debug and demonstrate the F280025C MCU.

Note that the FTDI chip, its support circuitry, and associated isolation components are placed in Macro A (the

left section of the controlCARD). Each of these components contains an additional “:A” within the component

reference designator (that is, R2:A for resistor 2 in Macro A) (see Figure 6-2).

The configuration of the switches on S1:A determine if the on-board emulator is active, if an external emulator

can be used, or if the device will boot from FLASH/peripherals (see Table 4-1 ).

5.2 Clocking Methodology

This controlCARD is required to support a broad range of TI's baseboards. Several designs rely on GPIO18

and GPIO19 for SPIA , while others require these GPIO to be utilized as a precision clock input source. To

accommodate both of these systems a switch (S3) has been added to the design. This methodology should not

be used in a final system as it increases EMI emissions and creates robustness susceptibilities. It is up to the

system designer to choose the best way to implement the clocking circuity for a given system.

5.3 Evaluation of the Analog-to-Digital Converters (ADCs)

When using the F280025C on-chip ADCs there are some useful guideline to follow to realize the performance

numbers listed in the data sheet. This is especially true for the AC parameters such as: SNR, THD, and SINAD.

Furthermore, it can also be shown that there is a direct correlation between the SNR of the ADC result and the

spread of ADC codes seen for a DC input; as such these tips will improve the range and standard deviation of a

DC input as well. Finally, while topics addressed will be with respect to the controlCARD, they are applicable to

other implementations using the F280025C MCU as well.

On-board resistors and capacitors: By default all inline resistors to the ADC pins are a simple 0-Ω shunt and

all capacitors to the ground plane are not populated. While this circuit can be used to supply the ADC inputs with

a voltage, likely both the resistor(R) and capacitor(C) will need to be populated based on the voltage source's

characteristics. Referring to the ADC Input Model in the TMS320F28002x Real-Time Microcontrollers data sheet,

the ADC input has its own RC network made up of the internal sample and hold capacitor, switch resistance,

and parasitic capacitance. By changing the inline resistance and parallel capacitor we can optimize the input

circuit to assist with settling time and/or filtering the input signal. Finally, it is recommended in general to use

Negative-Positive 0 PPM/°C (NP0/C0G) capacitors as these have better stability over temperature and across

input frequencies than other types of capacitors.

Voltage source and drive circuitry: While the on-chip ADCs are 12-bit architecture (4096 distinct output codes

when converting an analog signal to the digital domain); the translation will only be as precise as the input

provided to the ADC. The typical rule of thumb when defining the source resolution to realize the full specification

of an ADC is to have a 1-bit better source than the converter. In this case that would mean that ideally the analog

input should be accurate to 13-bits.

Typically voltage supplies or regulators are not designed to be precise, but rather accommodate a wide range of

current loads within a certain tolerance and for this reason are not ideal to show the performance of a higher bit

ADC, like the one on the F280025C. This does also not take into account that many times the supply in question

is providing the main voltage to power the MCU itself; which also introduces noise and other artifacts into the

signal.

In addition to the quality of the input signal there is also the aspect of the load presented to the ADC when it

samples the input. Ideally an input to an ADC would have zero impedance so as not to impact the internal R/C

network when the sampling event takes place. In many applications, however, the voltages that are sampled

by the ADC are derived from a series of resistor networks, often large in value to decrease the active current

consumption of the system. A solution to isolate the source impedance from the ADC sampling network is to

place an operational amplifier in the signal path. Not only does this isolate the impedance of the signal from the

ADC, it also shields the source itself from any effects the sampling network may have on the system.

Recommended source for evaluation: The Precision Signal Injector (PSI) EVM from TI was used to validate

the ADC performance on the F280025C ControlCARD. This EVM supports both single ended as well as

www.ti.com Special Notes

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TMS320F280025C controlCARD Information Guide 7

differential ended outputs using a 16-bit DAC as the signal source then passed through a high precision op-amp

with post amplifier filtering. The EVM is powered and controlled through a standard USB connection from a host

PC and includes a GUI to control its output. The outputs are routed through single or dual SMA type connectors;

it is highly recommended to place an additional female SMA connector (Figure 5-1) on the controlCARD docking

station to receive the signal via SMA for best noise immunity. For the local RC network 30-Ω resistors and 300pF

capacitors were used. Using this setup the ADC parameters were observed to be consistent with the numbers in

the data sheet.

Figure 5-1. Female SMA Connector

Special Notes www.ti.com

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6 Hardware References

Figure 6-1. Key Components on the controlCARD - Front

www.ti.com Hardware References

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TMS320F280025C controlCARD Information Guide 9

Figure 6-2. Key Components on the controlCARD - Back

WARNING

When the controlCARD is used in a high-voltage setup, it is the user’s responsibility to confirm that

the voltages and isolation requirements are identified and understood prior to energizing the board

or simulation. When energized, the controlCARD or components connected to the controlCARD

should not be touched. Furthermore, the capacitor C26:A should be removed to minimize the

possibility of leakage current flowing across the isolation barrier of the controlCARD.

Table 6-1. Hardware Connections

Connectors

J1:A Emulation/UART connector - USB mini A connector used to provide XDS100v2 emulation and

USB-to-UART (SCI) communication through FTDI logic. S1:A determines which connections are

enabled to the MCU.

J1 FSI Header – Updated over previous designs. This header is now keyed, contains 2 data lines, and

has 3.3 V power.

LEDs

D2:A Turns on when ISO JTAG logic is powered on (green)

D3:A JTAG/UART RX toggle indicator (blue)

D4:A JTAG/UART TX toggle indicator (blue)

D1 Controlled by GPIO–31 with negative logic (red)

D2 Controlled by GPIO–34 with negative logic (red)

D3 Turns on when the controlCARD is powered ON (green)

Hardware References www.ti.com

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