TPS62260LED-338 Three-Color LED Driver
Evaluation Module (EVM)
www.ti.com/led
User's Guide
Literature Number: SLVU240B
May 2008 – Revised August 2018
Contents
Preface ........................................................................................................................................ 4
1
Introduction ......................................................................................................................... 6
1.1
2
Setup .................................................................................................................................. 7
2.1
2.2
3
4.2
4.3
Hardware Design ..........................................................................................................
4.1.1 LED Power Stages ...............................................................................................
4.1.2 Output Filter Design ...............................................................................................
4.1.3 MODE and EN Pins ..............................................................................................
4.1.4 MSP430 MCU Design ............................................................................................
LED Color Table ............................................................................................................
Firmware Design ...........................................................................................................
4.3.1 Firmware C-Code Listing .........................................................................................
11
11
12
12
12
13
13
16
Schematics .................................................................................................................. 19
Bill of Materials ............................................................................................................. 21
Board Layout ..................................................................................................................... 22
6.1
6.2
6.3
A
Color Range ................................................................................................................. 9
Auto-Scroll Mode ............................................................................................................ 9
Manual Control Mode ....................................................................................................... 9
Schematic and Bill of Materials ............................................................................................ 19
5.1
5.2
6
7
7
7
7
8
Design Description ............................................................................................................. 11
4.1
5
Input/Output Connector Descriptions .....................................................................................
2.1.1 J1, J2, and J3 – Power Supply Connectors ....................................................................
2.1.2 JP1 – Wireless Interface Connector .............................................................................
2.1.3 JP2 – JTAG Interface Connector .................................................................................
Hardware Setup ..............................................................................................................
Supported Colors and Operation Modes ................................................................................. 9
3.1
3.2
3.3
4
Requirements ................................................................................................................ 6
1.1.1 Power Supply Requirements ...................................................................................... 6
1.1.2 Printed Circuit Board Assemblies (PCBs) ....................................................................... 6
Photographs of Top and Bottom ......................................................................................... 22
Layout ........................................................................................................................ 23
Thermal Images ............................................................................................................ 25
Reprogramming ................................................................................................................. 26
A.1
A.2
A.3
A.4
Additional Software and Hardware Needed ............................................................................
IAR Embedded Workbench KickStart Software Installation ..........................................................
Hardware Installation ......................................................................................................
Using IAR Embedded Workbench to Download Code on MSP430 MCUs .........................................
26
26
26
27
Revision History .......................................................................................................................... 28
2
Contents
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List of Figures
................................................................................................
3-1.
CIE Chromaticity Diagram
6-1.
HPA338 Top View .......................................................................................................... 22
6-2.
HPA338 Bottom View ...................................................................................................... 23
6-3.
PCB Top Assembly Layer ................................................................................................. 23
6-4.
PCB Layer One ............................................................................................................. 24
6-5.
PCB Layer Two ............................................................................................................. 24
6-6.
EVM Without Heatsink ..................................................................................................... 25
6-7.
EVM With Heatsink
........................................................................................................
10
25
List of Tables
5-1.
Bill of Materials
.............................................................................................................
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List of Figures
21
3
Preface
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Read This First
About This Manual
This user's guide describes the characteristics, setup, and use of the TPS62260LED-338 three-color lightemitting diode (LED) driver evaluation module (EVM). This EVM contains three TPS62260 2.25-MHz, 600mA step-down voltage converters and an MSP430F2131 microcontroller (MCU). Each TPS62260 applies
power to one of the three high brightness LEDs (red, green, or blue). The MSP430F2131 controls the
output current of the three converters individually.
How to Use This Manual
This document contains the following sections:
• Chapter 1 – Introduction
• Chapter 2 – Setup
• Chapter 3 – Supported Colors and Operation Modes
• Chapter 4 – Design Description
• Chapter 5 – Schematic and Bill of Materials
• Chapter 6 – Board Layout
• Appendix A – Reprogramming
Read Chapter 2 before connecting the board to a power supply for the first time.
Information About Cautions and Warnings
This user's guide may contain cautions and warnings.
CAUTION
This is an example of a caution statement.
A caution statement describes a situation that could potentially damage your
software or equipment.
WARNING
This is an example of a warning statement.
A warning statement describes a situation that could potentially
cause harm to you.
The information in a caution or a warning is provided for your protection. Read each caution and warning
carefully.
4
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Related Documentation From Texas Instruments
www.ti.com
Related Documentation From Texas Instruments
TPS6226x 2.25-MHz 600-mA Step Down Converter in 2 x 2 WSON and SOT Package data sheet
MSP430x2xx Family User's Guide
MSP430F21x1 Mixed-Signal Microcontrollers data sheet
MSP430F2131 Device Erratasheet
If You Need Assistance
Contact your local TI sales representative or ask a question on the TI E2E™ Community forums.
Trademarks
E2E, MSP430 are trademarks of Texas Instruments.
IAR Embedded Workbench, C-SPY are registered trademarks of IAR Systems.
Windows is a registered trademark of Microsoft Corporation.
All other trademarks are the property of their respective owners.
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Read This First
5
Chapter 1
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Introduction
This TPS62260LED-338 EVM enables the user to individually control the brightness of three highbrightness LEDs. By adjusting the relative brightness of each of the three LEDs, the user can generate a
wide range of colors across the spectrum.
The desired output color can be adjusted by means of a rotary encoder. Alternatively, the board can be
left in its default power-up state, in which it continuously cycles through the whole range of colors.
For more details on the operation of the board, refer to Chapter 3.
1.1
Requirements
To operate this EVM, it has to be supplied with a voltage between 3.6 V and 6 V. The current capability of
the power supply should be 1 A or higher. The EVM kit contains everything necessary to operate the EVM
except the DC power supply.
Reprogramming of the MSP430F2131 microcontroller can be done by connecting an MSP430™ JTAG
interface board (for example, the MSP-FET MSP MCU Programmer and Debugger). This MSP430
development tool is not included in the TPS62260LED-338 EVM.
1.1.1 Power Supply Requirements
The EVM requires a regulated DC power supply that can deliver 3.6 V to 6 V at 1 A.
CAUTION
Use of a poorly regulated AC adapter may generate overvoltage conditions
exceeding the absolute maximum ratings of some of the components used. It is
recommended that only well-regulated (5 V ± 0.5 V) adapters be used with this
EVM.
CAUTION
AC adapters with long cables (approximately 1 m or longer) can exhibit
significant stray capacitance that may interact with the EVM input capacitance
and cause ringing when hot plugged. To avoid such potentially damaging
overvoltage conditions, first plug the adapter DC plug into J3, then connect the
AC adapter to the mains.
1.1.2 Printed Circuit Board Assemblies (PCBs)
The EVM comprises a single PCB featuring four connectors, with one of them designed to accommodate
an optional low-power wireless interface. The wireless interface connection is not part of this EVM. For
more details, refer to Section 2.1.2.
6
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Chapter 2
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Setup
This chapter explains the function of the connectors on the PCB as well as how to properly connect, set
up, and use the TPS62260LED-338 EVM.
2.1
Input/Output Connector Descriptions
2.1.1 J1, J2, and J3 – Power Supply Connectors
J1 and J2 are two-pin headers for easy connection of a lab power supply. Connect a positive input voltage
between 3.6 V and 6 V to J1 and 0 V (ground) to J2. The lab power supply current limit has to be set to at
least 1 A.
J3 can be connected with a 5-mm × 2.5-mm barrel connector of the type commonly used with low-cost AC
adapters. The inner contact is positive (5 V) relative to the outer contact (GND). Possible wall adapters
could be Egston P2CFSW3–5 V/1.2 A, 5.0 VDC, 1.2 A with universal connector set (make sure that the
orientation of the connector is correct) or SL Power Electronics PW170KA05V/2A with the right country
connector.
2.1.2 JP1 – Wireless Interface Connector
The JP1 is a pin header that can be used for plug-on of the RF board from the eZ430-RF2500 kit, which is
separately available. With this additional module, the colors of the lamp can be controlled remotely
through the wireless RF interface.
NOTE: The firmware included in the standard EVM does not currently support wireless modules.
Users who wish to use wireless are required to write their own (simple) routines. Different
software libraries support the realization of star-networks or point-to-point wireless
connections using MSP430 microcontrollers. These libraries include SimpliciTi (star network)
or MSP430 and CC2500 code library (point-to-point connection).
NOTE: When the wireless module is connected to the standard EVM, the power requirement
increases. To support this higher power requirement, change resistor R11 to a 0805 68-Ω
resistor.
2.1.3 JP2 – JTAG Interface Connector
The JTAG connector JP2 is used as the programming interface for the MSP430F2131 microcontroller.
Only MSP430 JTAG programming adaptors (like the MSP-FET MSP MCU Programmer and Debugger)
can be used for the program download. This tool also allows debugging of a new MSP430 software.
The connector on the TPS62260LED-338 EVM uses standard pinning also used on the different MSP430
JTAG tools. This means that the cable delivered with MSP-FET can be plugged into the JP2 connector of
the TPS62260LED-338 EVM.
NOTE: Programming and debugging with the MSP430 JTAG interface tools works only if the
TPS62260LED-338 EVM is supplied by a 5-V power supply.
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Setup
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Hardware Setup
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The MSP430 JTAG programming adaptor is not part of this package but can be ordered from the TI Store.
For instructions to set up the programming adapter and update the program already installed on the
MSP430F2131, see Appendix A.
2.2
Hardware Setup
WARNING
Turning on the power supply lights the high-brightness LEDs on
the board, starting with blue and cycling automatically through the
color range.
Protective eyewear is recommended!
To set up the hardware:
• Plug the DC connector of the AC adapter into J3 or connect a lab power supply set to 3.6 V to 6 V
between J1 and J2.
• Plug the mains connector of the AC adapter into the mains supply.
• Turn on the mains supply.
CAUTION
Use of a poorly regulated AC adapter may generate overvoltage conditions
exceeding the absolute maximum ratings of some of the components used. It is
recommended that only well-regulated (5 V ± 0.5 V) adapters be used with this
EVM.
CAUTION
AC adapters with long cables (approximately 1 m or longer) can exhibit
significant stray capacitance that may interact with the EVM input capacitance
and cause ringing when hot plugged. To avoid such potentially damaging
overvoltage conditions, first plug the adapter DC plug into J3, then connect the
AC adapter to the mains.
8
Setup
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Chapter 3
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Supported Colors and Operation Modes
This chapter explains the two control modes of the TPS62260LED-338 EVM. If the LEDs are controlled in
a different way, specialized software can be downloaded through the JTAG connector JP2 to the
MSP430F2131. For the download process, refer to Appendix A.
3.1
Color Range
The TPS62260LED-338 EVM with the default software does not support the entire range of colors
described by the CIE chromaticity diagram, but instead supports a reduced subset. This approach greatly
reduces the design effort while simultaneously providing a range of possible colors spanning the
spectrum. Figure 3-1 shows the CIE chromaticity diagram representing the range of possible colors; the
inner triangle represents the reduced range of colors supported by the EVM with the default software.
When the EVM scrolls through its range of colors, it effectively traces the edges of the inner triangle
shown in Figure 3-1. As can be seen from this triangle, when tracing the edges clockwise this color
transitions from blue to green, through yellow and orange to red, and then from red through purple back to
blue.
3.2
Auto-Scroll Mode
The EVM powers up in auto-scroll mode starting with blue. In auto-scroll mode the MSP430 autonomously
cycles clockwise through the range of supported colors ad infinitum.
After switching to manual control mode by using the rotary encoder, auto-scroll mode can be entered by
powering up the board again.
3.3
Manual Control Mode
The EVM leaves auto-scroll mode and enters manual control mode the first time the rotary control is
activated. In manual control mode, the color balance of the three LEDs is adjusted by the user turning the
rotary encoder S1. The faster the encoder is turned, the faster the colors transition from one to another;
the direction of rotation determines whether the EVM traces the color triangle in Figure 3-1 clockwise or
counterclockwise.
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Manual Control Mode
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Figure 3-1. CIE Chromaticity Diagram
10
Supported Colors and Operation Modes
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Chapter 4
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Design Description
This chapter describes the design steps to build the hardware and firmware for the TPS62260LED-338
EVM. This chapter includes the board description and the detailed instructions used in the firmware
program loaded by default onto the MSP430F2131.
4.1
Hardware Design
The schematics and bill of materials referred to in the following design description are contained in
Chapter 5. The design contains three identical LED driver stages; only one (the red channel) is described.
4.1.1 LED Power Stages
Because the brightness of an LED is determined by the current flowing through it, not the voltage across
it, LEDs tend to be powered by current sources in all the simplest of applications (that is, when uniform
intensity and color balance are not important). In this application, each power stage uses a TPS62260
DC/DC converter configured as a controllable current source. Instead of using a resistor divider between
the output and GND to generate the feedback voltage, a small current-sensing resistor is inserted
between the LED cathode and GND. In this configuration, the TPS62260 controls its duty cycle at
whatever value is needed to regulate the voltage across the current-sensing resistor to 0.6 V (the internal
reference voltage of the IC). Using a 2-Ω current-sensing resistor, the LED current is therefore regulated
to a value given by:
ILED =
VFB
RSNS
=
0.6 V
= 300 mA
2Ω
(1)
Brightness is varied by pulse width modulating the current flowing through each LED. This approach has
two main advantages compared with using analog methods to control LED current.
First, the color balance of an LED changes with the current flowing through it, so not only is the brightness
of an LED at 10 mA different than at 100 mA, its color is, too. With pulse width modulation (PWM)
dimming, the current flowing through the LED when it is active is always the same so its color does not
change. As long as the dimming frequency is high enough, the only effect the human eye sees is a
variation in LED intensity. In this application, a nominal dimming frequency of 122 Hz is used.
Second, it is simpler and cheaper to generate three PWM signals using a microcontroller than three
analog voltages, which would require a 3-channel DAC.
The PWM dimming scheme works as follows:
• When the NET_DIMM_LED1 signal is low, D1 blocks any current flow away from the FB pin and U2
regulates LED current to its full-scale value of 300 mA (see Equation 1).
• When NET-DIMM_LED1 is high (close to the 3.3-V supply voltage of U2) the U2 FB pin is held at
1.35 V, which forces the duty cycle of U2 and consequently the LED current to zero (see Equation 2).
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VFB = VR9 + (VCC – VD1 – VR9) X
R7
R7 + R 5
VFB = VR9 + (3.3 V – 0.6 V – VR9) X
2.7 V
VFB = VR9 + (VCC –
2
10 kΩ
10 kΩ + 10 kΩ
VR9
2
VR9
VFB = VR
1+ 1.35 V
2
(2)
The average current flowing through the LED and its brightness are simply the products of the full-scale
(FS) LED current multiplied by the duty cycle of the dimming signal (NET_DIMM_LED1):
ILED(AVG) = ILED(FS) X DNET_DIMM_LED1
ILED(AVG) = 300 mA X DNET_DIMM_LED1
4.1.2
(3)
Output Filter Design
The TPS62260 data sheet states that the part is optimized for use with an output filter comprising a
2.2‑µH inductor and a 10-µF capacitor. In this application, the standard inductor value was used. However,
because output voltage ripple is uncritical (at 2.5 MHz the human eye detects no worsening of
performance) a smaller capacitor value of 4.7 µF was used to reduce cost.
4.1.3
MODE and EN Pins
The TPS62260 features a power-save mode to improve efficiency at low output powers, but it is not
needed in this application. By connecting the U2 MODE pin to VIN, this feature is disabled, and the device
operates permanently in PWM mode.
All three LED driver circuits are connected to a common enable signal (NET_EN) that allows the MSP430
MCU to completely enable and disable the power stages if necessary. A pulldown resistor is used for the
TPS62260 enable signal. This pulldown resistor causes all LEDs to switch off after the supply voltage is
applied to the EVM. The MSP430 MCU activates the LEDs and avoid flashing LEDs during startup.
4.1.4 MSP430 MCU Design
The MSP430 MCU is powered through a simple (and inexpensive) 3.3-V Zener diode linear regulator.
Resistor R11 sets the D5 bias current to approximately 5 mA, which is significantly more than the current
drawn by the MSP430. This maintains good regulation in the face of changing load currents. Because the
input supply to the board is regulated to 5 V, the Zener regulator circuit experiences almost no input
voltage variation.
The rotary encoder S1 allows manual control of the color interfaces of the lamp to the MSP430 MCU
using two digital input pins. When rotated, this type of encoder generates two pulse trains 90 degrees out
of phase. The number of turns can be determined by counting the number of pulses generated, the
direction of rotation can be determined by comparing the relative phase of the two signals, and the speed
of rotation can be determined by measuring the frequency of the pulses. This can be easily achieved
using one of the built-in timers of the MSP430 MCU.
R4 holds the three LED power stages in a disabled state until the MSP430 has powered up and is ready
to assume control. R1 and C1 provide a power-up reset for the MSP430. JP2 provides a JTAG interface
to allow easy debugging and JP1 provides the connections to the optional low-power wireless interface.
12
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LED Color Table
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4.2
LED Color Table
To obtain the correct optical response from the LEDs, their relative brightness (that is, the current flowing
through them) is not varied linearly, but is varied according to a lookup table derived from the CIE
chromaticity diagram. This lookup table is stored in the flash memory of the MSP430 MCU and defines the
edges of the inner triangle shown in Figure 3-1, which the EVM traces. The standard EVM lookup table
contains 252 locations, each of which contains the correct value for the red, green, and blue LED PWM
signals.
4.3
Firmware Design
This section details the function of the default software loaded onto the MSP430F2131. Because the color
scheme is set through integer values given in three LED color arrays, no software change is needed for
changing the color scheme. Changing the values in the LEDx[ ] arrays changes the colors.
#include "msp430x21x1.h"
All peripheral control registers and control bits of the MSP430F2131 are defined in the header file
msp430x21x1.h.
#define LED_TabLength 252*4
Here the length of the arrays LED1[ ], LED2[ ], and LED3[ ] is defined. It is used to detect the overflow of
the LEDptr. Care should be taken that all three arrays LED1[ ], LED2[ ], and LED3[ ] have the length that
is defined here.
const unsigned int LED1[]={65385,65385,65385, ¼,65385,65385}; //blue LED
const unsigned int LED2[]={ 150, 295, 622, ¼, 150, 150}; //green LED
const unsigned int LED3[]={ 150, 150, 150, ¼, 311, 150}; //red LED
The three arrays are used for the PWM duty cycle adjustment. For each LED (red, green, and blue) there
is an own array. But there is only one pointer (LEDptr) that is used to find the PWM settings for each of
the arrays. The values of the array should be within the range 100 to 65535.
unsigned int LEDptr;
This is the variable used as the pointer for the three arrays LED1[ ], LED2[ ], and LED3[ ].
unsigned char BAold;
This variable is used for the detection of a change of the incremental encoder.
void main(void)
{ unsigned int i,temp;
WDTCTL=WDTPW+WDTHOLD; // disable Watchdog
The Watchdog is not used in this program. So it is disabled.
BCSCTL1= CALBC1_8MHZ; //--- System Clock Settings ---------------------DCOCTL = CALDCO_8MHZ; // use calibrated 8MHz settings
The Watchdog is not used in this program. By setting the control bit WDTHOLD in control register
WDTCTL the Watchdog is disabled.
BCSCTL1= CALBC1_8MHZ; //--- System Clock Settings ---------------------DCOCTL = CALDCO_8MHZ; // use calibrated 8MHz settings
There are calibration values available in the flash memory of the MSP430 MCU. These two commands
move the calibration value for 8-MHz DCO output frequency into the clock system control registers.
//---- PWM Timer Initialization -----------------TACTL = TASSEL_2+ID_0+MC_0+TACLR+TAIE; // Timer clock = SMCLK = 8MHz
TACCTL0 = CM_0+CCIS_2+OUTMOD_1; // All Output Units will set PWM outputs if
TACCTL1 = CM_0+CCIS_2+OUTMOD_1; // TACCRx=TAR. Resetting PWM outputs is done
TACCTL2 = CM_0+CCIS_2+OUTMOD_1; // by software.
The Timer_A module is initialized here. It uses the calibrated 8-MHz DCO clock signal. A timer overflow
generates an interrupt. The three capture and compare blocks CCR0, CCR1, and CCR2 are used in
compare mode. The output unit of each CCR block is used to generate a PWM signal. The output units
are automatically setting the PWM output, while the resetting of the output signal is done by software as
soon as a timer overflow (Timer_A interrupt) happens.
LEDptr=0;
TACCR0=LED1[LEDptr>>2]; // LEDptr is shifted right twice,
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TACCR1=LED2[LEDptr>>2]; // this means divided by 4
TACCR2=LED3[LEDptr>>2];
LEDptr is cleared. This means the first values of the arrays LED1[], LED2[], and LED3[] are used at the
beginning. When LEDptr is used for the array, it is divided by 4 (shifting LEDptr two times right is the
same as divided by 4). This is done to avoid issues with the bouncing of the incremental encoder.
//--- Port Initialization ---------------------------------P1SEL = 0x0E; // P1.1, P1.2, P1.3 are used as PWM Timer Outputs
P1OUT = 0x00; // P1.0 is output (Enable for TPS62260)
P1DIR = 0xFF; // P1.4, P1.5, P1.6, P1.7 are not used => digital outputs
P2OUT = 0x04; // P2.0 and P2.1 are not used => digital outputs
P2DIR|= 0xE4; // P2.3, P2.4 are digital inputs => incremental encoder
// P2.5, P2.6, P2.7 are not used => digital outputs
Initialization of the digital I/Os. P1.1, P1.2, and P1.3 are used as Timer_A PWM output (module function).
All pins that are not used are defined as digital outputs.
BAold=0x01; //--- initialize decoder for incremental encoder -----------
Initialization of the variable used for incremental encoder detection.
Delay(); // Delay loop
TACTL |= MC_2; // start Timer_A (continuous mode)
After a short delay loop the Timer_A is started. The Timer_A is used in continuous mode, this means it
counts from 0 to 65535. If the counter is 65535 and the timer gets another clock the counter value is set to
0 and an overflow interrupt is generated.
__enable_interrupt(); // enables maskable interrupts
All maskable interrupts are enabled. Now the interrupt service routines are called if there is an interrupt
event.
temp=P2IN&0x18;
//--- Main Loops --------------------------------------------------------------while ((P2IN&0x18)==temp) //--- change settings automatically till
This is the first operating mode of the application. It stays in this loop as long as pins P2.3 and P2.4 do not
change (this means as long as the incremental encoder S1 was not used).
{ Delay(); // incremental encoder is operated
LEDptr=LEDptr+1;
if (LEDptr>=LED_TabLength)
LEDptr=0;
}
The first operating mode of the application automatically changes the LEDptr. This is done by using a
simple delay loop and afterwards the LEDptr is incremented. After incrementing the LEDptr it is checked if
the maximum table length is reached. If this is the case the LEDptr is reset.
while(1) //--- change settings manually (incremental encoder)
{ Inc_Decoder(0x03&(P2IN>>3)); // check incremental decoder
for(i=0;i>2]; // LEDptr is shifted right twice,
TACCR1=LED2[LEDptr>>2]; // this means divided by 4
TACCR2=LED3[LEDptr>>2];
The settings for the PWM duty cycles are read from the three LED arrays. This is done in the interrupt
service routine to ensure that it is synchronized with the timer. If this would be done in the main loop, the
LED would flicker in case of a change.
The PWM signal is generated from the Timer Capture and Compare Block, that is, a digital comparator
compares the Control Register (TACCRx) with the actual timer value. Are both values identical, the PWM
output is set. The reset of the PWM output has to be done by software. This is done with an interrupt
when there is a timer overflow and its Interrupt Service Routine updates the TACCRs register if
necessary.
If this is done in the main loop, the update could happen asynchronous to the timer. Then it could happen
that for one PWM cycle the PWM signal becomes inverted and the LED flickers.
//--- PWM signal generation
TACTL &= ~TAIFG;
TACCTL0 &= ~OUTMOD_7; // OUTMOD_0 => PWM output=L
TACCTL0 |= OUTMOD_1; // OUTMOD_1 => set PWM output TA0 as soon as TACCR0=TAR
TACCTL1 &= ~OUTMOD_7; // OUTMOD_0 => PWM output=L
TACCTL1 |= OUTMOD_1; // OUTMOD_1 => set PWM output TA1 as soon as TACCR1=TAR
TACCTL2 &= ~OUTMOD_7; // OUTMOD_0 => PWM output=L
TACCTL2 |= OUTMOD_1; // OUTMOD_1 => set PWM output TA2 as soon as TACCR2=TAR
// TAR = Timer_A counter
}
Finally the Timer_A interrupt flag is cleared and all output signals are reset. The Timer CCR blocks are
used to set the TAx output signals. Resetting the TAx outputs has to be done by software. That is done
here.
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4.3.1 Firmware C-Code Listing
A complete listing of the firmware used in the EVM is contained below:
/******************************************************************************/
/* RGB-LED Demo using MSP430F2131 and TPS62260 from Texas Instruments
*/
/*
*/
/* Description:
*/
/* Timer_A3 is used to generate 3 PWM signals. Timer overflow generates an
*/
/* interrupt and in its interrupt service routine the PWM outputs are
*/
/* reseted. Output Units will set the PWM outputs.
*/
/* Software starts in a demo mode that automatically changes the PWM
*/
/* settings. As soon as the incremental encoder is operated the automatic
*/
/* mode stops and the adjustment of the colour can be done manually.
*/
/*----------------------------------------------------------------------------*/
/* Texas Instruments Deutschland GmbH
*/
/* Christian Hernitscheck, November 2007
*/
/******************************************************************************/
#include "msp430x21x1.h"
#define
LED_TabLength
252*4
const unsigned int LED1[]={65385,65385,65385,65385,65385,65385,65385,65385,
65385,65385,65385,65385,65385,65385,65385,65385,65385,65385,65385,65385,65385,
65385,65385,65385,65385,65385,65385,65385,65385,65385,65385,65385,65385,65385,
65385,65385,65385,65385,65385,65385,65385,65385,65385,65385,57866,52635,47404,
42173,36943,34327,31712,29096,26481,23866,21250,19942,18635,17327,16019,14712,
13404,12096,10789, 9481, 8173, 7519, 6865, 6212, 5558, 4904, 4577, 4250, 3923,
3596, 3269, 2942, 2615, 2288, 1962, 1635, 1308, 981, 654, 327, 150, 150,
150, 150, 150, 150, 150, 150, 150, 150, 150, 150, 150, 150, 150,
150, 150, 150, 150, 150, 150, 150, 150, 150, 150, 150, 150, 150,
150, 150, 150, 150, 150, 150, 150, 150, 150, 150, 150, 150, 150,
150, 150, 150, 150, 150, 150, 150, 150, 150, 150, 150, 150, 150,
150, 150, 150, 150, 150, 150, 150, 150, 150, 150, 150, 150, 150,
150, 150, 150, 150, 150, 150, 150, 150, 150, 150, 150, 150, 150,
150, 150, 150, 150, 150, 327, 654, 981, 1308, 1635, 1962, 2288, 2615,
2942, 3269, 3596, 3923, 4250, 4577, 4904, 5558, 6212, 6865, 7519, 8173, 9481,
10789,12096,13404,14712,16019,17327,18635,19942,21250,23866,26481,29096,31712,
34327,36943,39558,42173,44789,47404,52635,57866,65385,65385,65385,65385,65385,
65385,65385,65385,65385,65385,65385,65385,65385,65385,65385,65385,65385,65385,
65385,65385,65385,65385,65385,65385,65385,65385,65385,65385,65385,65385,65385,
65385,65385,65385,65385,65385,65385,65385,65385,65385,65385,65385}; //blue LED
const unsigned int LED2[]={ 150, 295, 622, 949, 1276, 1603, 1930, 2256,
2583, 2910, 3237, 3564, 3891, 4218, 4545, 4872, 5526, 6180, 6833, 7487, 8141,
9449,10757,12064,13372,14680,15987,17295,18603,19910,21218,23834,26449,29064,
31680,34295,36911,39526,42141,44757,47372,52603,57834,65353,65353,65353,65353,
65353,65353,65353,65353,65353,65353,65353,65353,65353,65353,65353,65353,65353,
65353,65353,65353,65353,65353,65353,65353,65353,65353,65353,65353,65353,65353,
65353,65353,65353,65353,65353,65353,65353,65353,65353,65353,65353,65353,65353,
65353,65353,65353,65353,65353,65353,65353,65353,65353,65353,65353,65353,65353,
65353,65353,65353,65353,65353,65353,65353,65353,65353,65353,65353,65353,65353,
65353,65353,65353,65353,65353,65353,65353,65353,65353,65353,65353,65353,65353,
65353,65353,65353,57834,52603,47372,42141,36911,34295,31680,29064,26449,23834,
21218,19910,18603,17295,15987,14680,13372,12064,10757, 9449, 8141, 7487, 6833,
6180, 5526, 4872, 4545, 4218, 3891, 3564, 3237, 2910, 2583, 2256, 1930, 1603,
1276, 949, 622, 295, 150, 150, 150, 150, 150, 150, 150, 150, 150,
150, 150, 150, 150, 150, 150, 150, 150, 150, 150, 150, 150, 150,
150, 150, 150, 150, 150, 150, 150, 150, 150, 150, 150, 150, 150,
150, 150, 150, 150, 150, 150, 150, 150, 150, 150, 150, 150, 150,
150, 150, 150, 150, 150, 150, 150, 150, 150, 150, 150, 150, 150,
150, 150, 150, 150, 150, 150, 150, 150, 150, 150, 150, 150, 150,
150, 150, 150, 150, 150, 150, 150, 150, 150, 150, 150}; //green LED
const unsigned int LED3[]={ 150, 150, 150, 150, 150, 150, 150, 150,
150, 150, 150, 150, 150, 150, 150, 150, 150, 150, 150, 150, 150,
150, 150, 150, 150, 150, 150, 150, 150, 150, 150, 150, 150, 150,
150, 150, 150, 150, 150, 150, 150, 150, 150, 150, 150, 150, 150,
16
Design Description
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150, 150, 150, 150, 150, 150, 150, 150, 150, 150, 150, 150, 150,
150, 150, 150, 150, 150, 150, 150, 150, 150, 150, 150, 150, 150,
150, 150, 150, 150, 150, 150, 150, 150, 150, 150, 150, 150, 311,
638, 965, 1292, 1619, 1946, 2272, 2599, 2926, 3253, 3580, 3907, 4234, 4561,
4888, 5542, 6196, 6849, 7503, 8157, 9465,10773,12080,13388,14696,16003,17311,
18619,19926,21234,23850,26465,29080,31696,34311,36927,39542,42157,44773,47388,
52619,57850,65369,65369,65369,65369,65369,65369,65369,65369,65369,65369,65369,
65369,65369,65369,65369,65369,65369,65369,65369,65369,65369,65369,65369,65369,
65369,65369,65369,65369,65369,65369,65369,65369,65369,65369,65369,65369,65369,
65369,65369,65369,65369,65369,65369,65369,65369,65369,65369,65369,65369,65369,
65369,65369,65369,65369,65369,65369,65369,65369,65369,65369,65369,65369,65369,
65369,65369,65369,65369,65369,65369,65369,65369,65369,65369,65369,65369,65369,
65369,65369,65369,65369,65369,65369,65369,65369,65369,57850,52619,47388,42157,
36927,34311,31696,29080,26465,23850,21234,19926,18619,17311,16003,14696,13388,
12080,10773, 9465, 8157, 7503, 6849, 6196, 5542, 4888, 4561, 4234, 3907, 3580,
3253, 2926, 2599, 2272, 1946, 1619, 1292, 965, 638, 311, 150}; //red LED
unsigned int LEDptr;
unsigned char BAold;
void Inc_Decoder(unsigned char BAnew);
void Delay(void);
//-----------------------------------------------------------------------------// Main Program
void main(void)
{ unsigned int i,temp;
WDTCTL=WDTPW+WDTHOLD;
// disable Watchdog
BCSCTL1= CALBC1_8MHZ;
DCOCTL = CALDCO_8MHZ;
//--- System Clock Settings ---------------------// use calibrated 8MHz settings
//---- PWM Timer Initialization -----------------TACTL = TASSEL_2+ID_0+MC_0+TACLR+TAIE; // Timer clock = SMCLK = 8MHz
TACCTL0 = CM_0+CCIS_2+OUTMOD_1; // All Output Units will set PWM outputs if
TACCTL1 = CM_0+CCIS_2+OUTMOD_1; // TACCRx=TAR. Resetting PWM outputs is done
TACCTL2 = CM_0+CCIS_2+OUTMOD_1; // by software.
LEDptr=0;
TACCR0=LED1[LEDptr>>2]; // LEDptr is shifted right twice,
TACCR1=LED2[LEDptr>>2]; //
this means divided by 4
TACCR2=LED3[LEDptr>>2];
P1SEL =
P1OUT =
P1DIR =
P2OUT =
P2DIR|=
0x0E;
0x00;
0xFF;
0x04;
0xE4;
//--- Port Initialization ---------------------------------// P1.1, P1.2, P1.3 are used as PWM Timer Outputs
// P1.0 is output (Enable for TPS62260)
// P1.4, P1.5, P1.6, P1.7 are not used => digital outputs
// P2.0 and P2.1 are not used => digital outputs
// P2.3, P2.4 are digital inputs => incremental encoder
// P2.5, P2.6, P2.7 are not used => digital inputs
BAold=0x01;
//--- initialize decoder for incremental encoder -----------
Delay();
TACTL |= MC_2;
// Delay loop
// start Timer_A (continuous mode)
__enable_interrupt();
// enables maskable interrupts
temp=P2IN&0x18;
//--- Main Loops --------------------------------------------------------------while ((P2IN&0x18)==temp)
//--- change settings automatically till
{ Delay();
//
incremental encoder is operated
LEDptr=LEDptr+1;
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if (LEDptr>=LED_TabLength)
LEDptr=0;
}
while(1)
//--- change settings manually (incremental encoder)
{ Inc_Decoder(0x03&(P2IN>>3));
// check incremental decoder
for(i=0;i>2]; // LEDptr is shifted right twice,
TACCR1=LED2[LEDptr>>2]; //
this means divided by 4
TACCR2=LED3[LEDptr>>2];
//--- PWM signal generation
TACTL &= ~TAIFG;
TACCTL0 &= ~OUTMOD_7; // OUTMOD_0 => PWM output=L
TACCTL0 |= OUTMOD_1; // OUTMOD_1 => set PWM output TA0 as soon as TACCR0=TAR
TACCTL1 &= ~OUTMOD_7; // OUTMOD_0 => PWM output=L
TACCTL1 |= OUTMOD_1; // OUTMOD_1 => set PWM output TA1 as soon as TACCR1=TAR
TACCTL2 &= ~OUTMOD_7; // OUTMOD_0 => PWM output=L
TACCTL2 |= OUTMOD_1; // OUTMOD_1 => set PWM otuput TA2 as soon as TACCR2=TAR
//
TAR = Timer_A counter
}
18
Design Description
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Chapter 5
SLVU240B – May 2008 – Revised August 2018
Schematic and Bill of Materials
This chapter provides the TPS62260LED-338 schematics and bill of materials.
5.1
Schematics
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Schematic and Bill of Materials
19
Schematics
20
Schematic and Bill of Materials
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Bill of Materials
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5.2
Bill of Materials
Table 5-1. Bill of Materials (1)
RefDes (4)
COUNT
(1)
(2)
(3)
(4)
(5)
(6)
VALUE
DESCRIPTION
(2) (3)
SIZE
PART NO.
MANUFACTURER
1
C1
10nF
Capacitor, Ceramic, 50V,
X5R, 20%
0603
std
std
1
C2
100nF
Capacitor, Ceramic, 50V,
X5R, 20%
0603
std
std
4
C3, C4, C9,
C11
22uF
Capacitor, Ceramic, 16V,
X5R, 20%
1210
C1210C226M4PAC
KEMET
7
C5 - C8, C10,
C12, C13
4.7uF
Capacitor, Ceramic, 6.3V,
X5R, 20%
0603
C0603C475M9PAC
KEMET
3
D1, D2, D6
TS4148RY
Diode, Hi-Speed, 150mA, 100V, 500mW
0805
TS4148RY
Taiwan
Semiconductor
1
D3
LR W5SM
Diode, LED Red, 500-mA
0.244 × 0.441 inch
LR W5SM-HYJY-1-0-400-R18Z
Osram
1
D4
LB W5SM
Diode, LED Blue, 500-mA
0.244 × 0.441 inch
LB W5SM-EYGX-35-0-350R18-Z
Osram
1
D5
BZX84-C3V3
Diode, Zener, 3.3V, 250mW, 5%
SOT23
BZX84-C3V3
NXP
Semiconductor
1
D7
LT W5SM
Diode, LED Green, 500-mA
0.244 × 0.441 inch
LT W5SM-HYJZ-25-0-350R18-Z
Osram
2
J1, J2
PTC36SAAN
Header, Male 2-pin, 100mil spacing, (36pin strip)
0.100 inch × 2
PTC36SAAN
Sullins
1
J3
RAPC 712
Connector, Pin dia.2.5mm, DC Jack,
0.57 × 0.35 inch
RAPC 712
Switchcraft
1
JP1
850-106-10-S-RA
Header, 1x6-pin, 50mil spacing
1.000 × 0.085 inch
850-10-006-20-001000
Millmax
1
JP2
2514-6002UB
Connector, Male Straight 2x7 pin, 100mil
spacing, 4 Wall
0.100 inch × 2X7
2514-6002UB
3M
3
L1, L2, L3
2.2uH
Inductor, SMT, 2.2uH, 1.1A, 110-milliohm
orAlternate Inductor; SMT, 2.2uH, 1.0A,
120-milliohm
2.5 × 2.0 mm
2.5 × 2.0 × 1.2mm
MIPSA2520D2R2LQM2HPN2
R2MJ0L
FDKmuRata
1
R1
47.0k
Resistor, Chip, 1/16W, 1%
0603
Std
Std
1
R11
330
Resistor, Chip, 1/16W, 1%
0603
Std
Std
3
R2, R3, R4
100k
Resistor, Chip, 1/16W, 1%
0603
Std
Std
6
R5 - R8, R12,
R13
10.0k
Resistor, Chip, 1/16W, 1%
0603
Std
Std
3
R9, R10, R14
2.00
Resistor, Chip, 1/8W, 1%
1206
Std
Std
1
S1
3315C-001
Encoder, Sealed Incremental, 9 mm
Square
0.375 × 0.400 inch
3315C-001
Bourns
9
TP1 - TP9
5001
Test Point, Black, Thru Hole Color Keyed
0.100 × 0.100 inch
5001
Keystone
1
U1
MSP430F2131TRGE
IC, Mixed Signal Microcontroller
QFN-24
MSP430F2131TRGE
TI
3
U2, U3, U4
TPS62260DRV
IC, 2.25MHz 600mA Step-Down
Converter
SON-6[DRV]
TPS62260DRV
TI
1
--
HPA338 Rev. A
Any
1
--
020-2220 (5)
Knob, collet locking, black plastic
10mm overall dia.
1/8" shaft dia.
"020-2220 orequivalent"
ELMA
1
--
040-1020 (6)
Cap, black plastic
10mm overall dia.
040-1020 or equivalent
ELMA
PCB, 4.33 In x 2.4 In x 0.062 In
These assemblies are ESD sensitive; ESD precautions shall be observed.
These assemblies must be clean and free from flux and all contaminants. Use of clean flux is required.
These assemblies must comply with workmanship standards IPC-A-610 Class 2.
Reference designators marked with an asterisk ('**') cannot be substituted. All other components can be substituted with
equivalent components from other manufacturers.
Knob 020-2220 shall be installed onto S1 after final board assembly
Cap 040-1020 shall be installed onto Knob 020-2220
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Schematic and Bill of Materials
21
Chapter 6
SLVU240B – May 2008 – Revised August 2018
Board Layout
This chapter provides the TPS62260LED-338 EVM board layout and illustrations.
6.1
Photographs of Top and Bottom
Figure 6-1. HPA338 Top View
22
Board Layout
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Layout
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Figure 6-2. HPA338 Bottom View
6.2
Layout
Figure 6-3. PCB Top Assembly Layer
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Layout
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Figure 6-4. PCB Layer One
Figure 6-5. PCB Layer Two
24
Board Layout
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Thermal Images
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6.3
Thermal Images
Figure 6-6 and Figure 6-7 show the thermal images of two EVM boards. The image in Figure 6-6 was
obtained without using a heatsink and the image in Figure 6-7 with a heatsink mounted on the bottom of
the PCB. Using a heatsink not only reduces the operating temperature of each LED, it also helps
significantly to spread the heat more evenly.
These images were obtained using modified firmware that forced all three LEDs to operate with a 100%
dimming duty cycle, meaning that they are fully on. Using the standard firmware, each LED is on for only
one third of the time and off for two thirds of the time. As a result, the heat dissipation during normal use
with the standard firmware is significantly lower than in this test case.
The heatsink used was SK 477 100 fixed with the thermally conductive foil WLFT 404 R25 both from
Fischer Elektronik.
Figure 6-6. EVM Without Heatsink
Figure 6-7. EVM With Heatsink
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Board Layout
25
Appendix A
SLVU240B – May 2008 – Revised August 2018
Reprogramming
A.1
Additional Software and Hardware Needed
1. IAR Embedded Workbench KickStart
This is a free version that can be downloaded from www.ti.com/tool/iar-kickstart.
2. Source Code
This source code can be found in the TPS62260LED-338EVM product folder. Self-written code can
also be used. After downloading the zip file, extract it to a single folder.
3. MSP-FET MSP MCU Programmer and Debugger
A.2
IAR Embedded Workbench KickStart Software Installation
Extract the downloaded zip file and execute the install file (FET_Rxxx.exe). Read through the release
notes to make sure that the software is installed properly.
Follow the instructions on the supplied release notes to install the IAR Embedded Workbench® KickStart
Kit. The term KickStart refers to the function-limited version of IAR Embedded Workbench (including CSPY® debugger). KickStart is supplied on the CD-ROM included with each FET, and the latest version is
available from the TI web site. The release notes can be accessed using Start → Programs → IAR
Systems → IAR Embedded Workbench KickStart for MSP430 Vx. KickStart is compatible with Windows®
98, Windows 2000, Windows ME, Windows NT 4.0, Windows XP, and Windows Vista. However, the USB
FET interface works only with Windows 2000, Windows XP, and Windows Vista.
A.3
Hardware Installation
For MSP-FET:
1. Use the USB cable to connect the USB FET interface module to a USB port of your PC. The USB FET
should be recognized instantly, as the USB device driver should have been installed with the KickStart
software.
If for any reason the Install Wizard starts, respond to the prompts and, when prompted, browse to the
driver files that are located in \Embedded Workbench x.x\430\bin\WinXP. Detailed
driver installation instructions can be found in the MSP Debuggers User's Guide.
2. After connecting to a PC, the USB FET performs a self test during which the red LED flashes for about
two seconds. After the self test passed successfully, the green LED lights permanently.
3. Use the 14-pin cable to connect the USB FET interface module to the HPA338 board.
26
Reprogramming
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Using IAR Embedded Workbench to Download Code on MSP430 MCUs
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A.4
Using IAR Embedded Workbench to Download Code on MSP430 MCUs
1. Start the Workbench (Start → Programs → IAR Systems → IAR Embedded Workbench KickStart for
MSP430 Vx → IAR Embedded Workbench).
2. Click Open existing workspace to open an existing file (for example, HPA338RevA.eww, which is one
of the files that are part of the software files available in the TPS62260LED-338EVM product folder
The workspace window opens. You can also generate a new project and program the MSP430 by your
own to light the LEDs as desired, but this is beyond the topic of this user's guide. For more details on
programming the MSP430, refer to www.ti.com/msp430.
3. Click Project → Options → FET Debugger → Setup → Texas Instruments USC-IF for the USC
Interface (MSP430-FET).
4. Click Project → Rebuild All to build and link the source code.
5. Click Project → Debug to start the C-SPY debugger. C-SPY erases the device Flash and then
downloads the application object file to the device Flash. The LEDs on the board turn off.
6. Click Debug → Stop Debugging. Reset the MSP430 MCU by disconnecting and reconnecting the
power plug. This restarts the program on the MCU.
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27
Revision History
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Revision History
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
Changes from October 15, 2008 to August 7, 2018 ........................................................................................................ Page
•
•
•
•
28
Editorial and formatting changes and updated links throughout document ....................................................... 4
Changed the MSP430 programmer from MSP-FET430UIF to MSP-FET ......................................................... 6
Removed paragraph that began "After installation, a PC reboot is required..." in Section A.2, IAR Embedded Workbench
KickStart Software Installation ......................................................................................................... 26
Removed all references to MSP-FET430PIF (obsolete) ........................................................................... 26
Revision History
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