Texas Instruments Piccolo F280049 Manuale utente

SPRUIC4C–July 2017–Revised January 2019

Piccolo F280049 controlCARD Information Guide

User's Guide

SPRUIC4C–July 2017–Revised January 2019

Piccolo F280049 controlCARD Information Guide

The Piccolo F280049 controlCARD from Texas Instruments (TI) is intended to provide a well-filtered

robust design capable of working in most environments. This document describes the hardware details of

the F280049 controlCARD and explains the functions, locations of jumpers, and connectors present on the

board.

Contents

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

2 Errata.......................................................................................................................... 3

2.1 Warnings, Notes, and Errata...................................................................................... 3

3 Getting Familiar With the controlCARD................................................................................... 3

3.1 F280049 controlCARD Features.................................................................................. 3

3.2 F28004x Device Description ...................................................................................... 3

3.3 Assumed Operating Conditions................................................................................... 4

3.4 Using the controlCARD ............................................................................................ 4

3.5 Software Development............................................................................................. 4

4 Special Notes................................................................................................................. 5

4.1 XDS100v2 Emulator and SCI/UART Connectivity.............................................................. 5

4.2 cJTAG Usage ....................................................................................................... 6

4.3 Evaluation of the Programmable Gain Amplifier (PGA) ....................................................... 7

4.4 Evaluation of the Analog to Digital Converters(ADCs)......................................................... 8

4.5 Evaluation of the Internal DC/DC Converter ................................................................... 9

5 Hardware References ..................................................................................................... 10

List of Figures

1 F280049 controlCARD Installed on TMDSHSECDOCK................................................................ 2

2 XDS100v2 Emulation Circuitry and Isolation Circuitry is Denoted by :A ............................................. 6

3 PGA With S7 Open (Output Filter Usable)............................................................................... 7

4 PGA With S7 Closed (Output Filter Not Usable) ........................................................................ 7

5 Partial Schematic Showing Default R and C values .................................................................... 8

6 Female SMA Connector .................................................................................................... 9

7 Key Components on the controlCARD.................................................................................. 10

List of Tables

1 F280049 controlCARD Part Numbers .................................................................................... 3

2 Getting Started Reference.................................................................................................. 4

3 Hardware References ..................................................................................................... 11

4 Boot Mode Switch (S1) Positions ........................................................................................ 13

Introduction

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Piccolo F280049 controlCARD Information Guide

1 Introduction

Figure 1. F280049 controlCARD Installed on TMDSHSECDOCK

The Piccolo F280049 controlCARD from Texas Instruments (TI) provides a great way to learn and

experiment with the F28004x device family within TI’s C2000 family of microcontrollers (MCUs). This

controlCARD uses the 120HSEC connector (compatible with the TMDSHSECDOCK docking station) and

is intended to provide a well-filtered robust design capable of working in most environments. This

document describes the hardware details of the F280049 controlCARD and explains the functions,

locations of jumpers, and connectors present on the board.

The Hardware Developer’s Kit, which is a full set of files necessary to evaluate and develop with the

F280049 device, can be found in C2000Ware and includes:

• Schematics – designed in Altium

• Bill of materials (BOM)

• Layout PCB files – designed in Altium

• Gerber files

NOTE: This kit is designed to explore the functionality of the F28004x microcontroller family. The

controlCARD can be treated as a good reference design, but 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 final customer system.

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Errata

SPRUIC4C–July 2017–Revised January 2019

Piccolo F280049 controlCARD Information Guide

This controlCARD can be obtained by ordering one of the products from Table 1.

Table 1. F280049 controlCARD Part Numbers

Part Number Status Description

TMDXDOCK280049M Experimental XF280049M controlCARD and HSEC docking station bundle

TMDSDOCK280049C Qualified F280049C controlCARD and HSEC docking station bundle

TMDSCNCD280049C Qualified F280049C controlCARD

2 Errata

Current revision of controlCARD as of June, 2018: PCB rev - B, ASSY rev - none.

2.1 Warnings, Notes, and Errata

Notes for all controlCARDs:

• The docking station is capable of drawing power through the included USB cable. However, when

external components are added to the docking station for experimentation, the system may require

more power than a standard USB port can provide (5-V and 500-mA). This is especially true when

additional circuitry has been added to the docking station. In such cases, an external 5-VDC power

supply (2.5-mm inner diameter × 5.5-mm outer diameter) plugged into J1 is recommended. A

compatible supply could be the: Phihong PSAC05R-050(P)-R-C2 + Phihong RPBAG.

• The F28004x by default expects GPIO24 and GPIO32 to be the input pins responsible for determining

the device boot mode at power up; the external pull directions for GPIO24 and GPIO32 are configured

with S1 (see Table 4). If desired, the GPIO pins used for boot mode selection can be modified by

programming the OTP in the device. Refer to the Boot ROM section of the specific device’s Technical

Reference Manual (TRM) for more information.

• The controlCARD included with TMDXDOCK280049M uses prototype silicon XF280049M. XF280049M

is a prototype variant only, and is not offered in production. It has the same functionality and

configuration as the qualified variant F280049C.

3 Getting Familiar With the controlCARD

3.1 F280049 controlCARD Features

•Piccolo F280049 Microcontroller – High performance C2000 microcontroller on the controlCARD.

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

controlCARD-based application kits and TMDSHSECDOCK. Compatibility with 100-pin DIMM

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. This external emulator may use standard 4-pin JTAG or 2-pin cJTAG.

•Key Signal Breakout – Most GPIO, ADC, and other key signals routed to hard gold connector fingers.

•Robust Power Supply Filtering – Single 5-VDC supply provides power to onboard 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 several ADC input pins.

3.2 F28004x Device Description

For a complete description of the F28004x devices, see Section 1.3 of the TMS320F28004x Piccolo™

Microcontrollers data sheet (SPRS945).

Getting Familiar With the controlCARD

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Piccolo F280049 controlCARD Information Guide

3.3 Assumed Operating Conditions

This kit is assumed to run at standard room conditions. The EVM should run at approximately Standard

Ambient Temperature and Pressure (SATP) with moderate-to-low humidity.

3.4 Using the controlCARD

For the controlCARD to work, the controlCARD MCU must be powered. This is usually done by inputting

5-VDC through the HSEC connector through an accompanying baseboard. For example, if using a

docking station baseboard, 5-VDC should be input into the docking station’s J1 or J17, then SW1 must be

toggled to the appropriate position.

Based on the way that the controlCARD is used, additional hardware settings may be necessary, as

shown in Table 2.

Table 2. Getting Started Reference

Component Debug Using CCS and the

on-card XDS100v2 Emulator Debug Using CCS and an

External Emulator Through

the Baseboard

Standalone (Boot From

FLASH or Other Boot Mode)

S1:A (controlCARD) Left (Switch 1): Up (ON) Left (Switch 1): Down (OFF) Left (Switch 1): Down (OFF)

J1:A (controlCARD) Connect a mini USB cable

between J1:A and the

computer.

In CCS, use this target

configuration:

F280049 device with an

XDS100v2 emulator.

— —

S1 (controlCARD) Left (Switch 2): Down (ON)

Right (Switch 1): Up (OFF)

Putting the C2000 device into

Wait Mode can reduce the risk

of connectivity issues.

Left (Switch 2): Down (ON)

Right (Switch 1): Up (OFF)

Putting the C2000 device into

Wait Mode can reduce the risk

of connectivity issues.

Set S1 as desired

(See Table 4 for supported

settings)

Baseboard’s JTAG connector

(J2 on the Docking Station

baseboard) —Connect an external emulator

and appropriately configure the

CCS target configuration. —

The F280049 controlCARD to docking station signal mapping can be found in the C2000Ware

controlCARD product directory at \ti\c2000\C2000Ware_XXXX\boards\controlCARDs:

•TMDSCNCD28004x_RevA_120cCARD_pinout.pdf -- F280049 signal mapping on the default HSEC

docking station

•TMDSCNCD28004x_RevA_100DIM_map.pdf -- F280049 signal mapping on the legacy DIM100

docking station if using TMDSADAP180TO100 adapter card

Hardware support files for the F280049 controlCARD and docking station can also be found in the

C2000Ware product directories:

• F280049 controlCARD: \ti\c2000\C2000Ware_XXXX\boards\controlCARDs

• Docking station: \ti\c2000\C2000Ware_XXXX\boards\ExperimenterKits

3.5 Software Development

Code Composer Studio (CCS) is the recommended integrated development environment (IDE) 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.

NOTE: For users of TMDXDOCK280049M

TMS320F280049M is a discontinued part number that is not supported on new installations

of CCS. Use the functionally equivalent TMS320F280049C part number when creating a new

target configuration for TMDXDOCK280049M on new installations of CCS.

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Special Notes

SPRUIC4C–July 2017–Revised January 2019

Piccolo F280049 controlCARD Information Guide

C2000Ware contains a full suite of example software designed to work with the F280049 controlCARD.

This software package includes many example projects which 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 programming examples are located at:

\ti\c2000\C2000Ware_XXXX\device_support\f28004x\examples

• Driverlib programming examples are located at:

\ti\c2000\C2000Ware_XXXX\driverlib\f28004x\examples

4 Special Notes

4.1 XDS100v2 Emulator and SCI/UART Connectivity

The F280049 controlCARD provides on-board emulation and USB-to-UART adapter functionality. This

allows for a convenient method to debug and demo the F280049 MCU.

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).

Each F280049 controlCARD’s XDS100v2 is programmed with a fixed serial number. If a debug session

must involve two or more F280049 controlCARDs, each controlCARDs must have a unique serial number,

and some must be reprogrammed. See:

http://processors.wiki.ti.com/index.php/XDS100#Q:_Can_I_change_the_serial_number_on_my_XDS100v2

.3F.

The configuration of the switches on S1:A (shown in Figure 2) determine whether the onboard emulator is

active, whether an external emulator can be used, or whether the device will boot from

FLASH/peripherals.

Special Notes

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Figure 2. XDS100v2 Emulation Circuitry and Isolation Circuitry is Denoted by :A

4.2 cJTAG Usage

The F280049 MCU supports the cJTAG 2-pin debugging interface, but the onboard XDS100v2 emulator

does not. To experiment with cJTAG, an external emulator must be connected through the baseboard. To

enable cJTAG:

1. Connect an external emulator to the controlCARD's baseboard.

2. Change S4 to the cJTAG position (switch flipped up).

3. If cJTAG is used, the F280049 MCU will have two additional GPIOs which can be used by the

application. Configure S2 and S3, as desired, to control which controlCARD fingers or pins the newly

available GPIOs are connected to.

C34

330pF

RGND

MCU_A_3V3 (VDDA)

PGA1_IN

PGA1_GND

GND (VSSA)

PGA1

ROUT

PGA1_OUT

PGA1_OF

GND

R37

0 

C41

DNP

GND

HSEC_ADC-A2,B6,PGA1_IN

R48

0 

R55

DNP

GND

HSEC_PGA1_GND

ADC

RFILTER

C34

330pF

RGND

MCU_A_3V3 (VDDA)

PGA1_IN

PGA1_GND

GND (VSSA)

PGA1

ROUT

PGA1_OUT

RFILTER

PGA1_OF

GND

R37

0 

C41

DNP

GND

HSEC_ADC-A2,B6,PGA1_IN

R48

0 

R55

DNP

GND

HSEC_PGA1_GND

ADC

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Special Notes

SPRUIC4C–July 2017–Revised January 2019

Piccolo F280049 controlCARD Information Guide

4.3 Evaluation of the Programmable Gain Amplifier (PGA)

When evaluating the PGA, the PGA_GND pin must be driven to the ground reference of the PGA_IN

signal. The PGA_GND signal may be provided using differential signaling through the HSEC fingers for

improved noise immunity, or the PGA_GND pin may be tied to the GND reference of the controlCARD

through a 0-Ωresistor (R55 in Figure 3) for simplicity.

Figure 3. PGA With S7 Open (Output Filter Usable)

The S7 switch bank provides the flexibility to either use the PGA output filter pin (PGAn_OF) for filtering

(S7 open in Figure 3) or for sampling the PGA input voltage directly by bypassing the internal PGA (S7

closed in Figure 4).

Figure 4. PGA With S7 Closed (Output Filter Not Usable)

NOTE: The S7 closed implementation for PGA6 is different from the other PGAs. Instead of shorting

PGA6_OF and PGA6_IN, the PGA6_OF signal may be accessed from the HSEC connector

independently of the PGA6_IN signal.

NOTE: The PGA RFILTER resistor should never be enabled while the S7 switch is closed. Prolonged

exposure to contention between the PGA_IN and PGA_OF pins may result in permanent

damage to the internal RFILTER resistor.

Special Notes

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4.4 Evaluation of the Analog to Digital Converters(ADCs)

When using the F280049 on-chip ADCs there are some useful guideline to follow to realize the

performance numbers listed in the datasheet. 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 F280049 MCU as well.

On-board resistors and capacitors: By default (Figure 5) all inline resistors to the ADC pins are a simple

0-Ωshunt 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, 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 either

NPO(Negative-Positive 0 PPM/°C) or COG(Ceramic On Glass) as these have better stability over

temperature and across input frequencies than other types of capacitors.

Figure 5. Partial Schematic Showing Default R and C values

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 F280049. 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.

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Special Notes

SPRUIC4C–July 2017–Revised January 2019

Piccolo F280049 controlCARD Information Guide

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

validate the ADC performance on the F280049C ControlCARD. This EVM supports both single ended as

well as 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 6) on the controlCARD docking station to receive the signal via SMA for best noise immunity. For

the local RC network 30-Ωresistors and 300pF capacitors were used. Using this setup the ADC

parameters were observed to be consistent with the numbers in the datasheet.

Figure 6. Female SMA Connector

4.5 Evaluation of the Internal DC/DC Converter

The controlCARD, by default, assumes the F280049 internal VREG will be used to generate the 1.2-V

power supply required by the MCU. The controlCARD enables the user to use the internal DC/DC

converter capabilities, with some soldering.

To enable the internal DC/DC converter:

• R18 and R19 must be unpopulated.

• R21 and R22 must be populated with a 0-Ωresistor.

• C19 must be populated with a 2.2-µF X5R/X7R capacitor.

• C20 and C21 must each be populated with a 10-µF X5R/X7R capacitor.

Functionally, the F280049 powers up the 1.2-V power rail using the internal VREG, then requires software

to change from the VREG to the DC/DC. See the F28004x Technical Reference Manual for more details.

Hardware References

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Piccolo F280049 controlCARD Information Guide

5 Hardware References

Table 3 shows the various connections available on the board. Figure 7 illustrates the location of many of

these components on the board.

Figure 7. Key Components on the controlCARD

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