Application Report
SPMA071 – March 2014
Thermal Printer Reference Design Using TM4C1233H6PM
Jabir VS
ABSTRACT
Thermal printers are very common due to their wide-spread use in so many devices in our day-to-day life.
Some of them are handheld devices used for point-of-sales, ticketing machines, metering, and so forth.
The benefits of thermal printers are compelling. There is no toner, ink or ribbons required for a thermal
printer. A thermal receipt printer uses a printhead with few moving parts and it fits in a thin space about
three inches across. By contrast, the standard receipt printer is composed of about 20 moving parts and
electrical devices, and takes up at least twice the space. Nowadays, thermal printer mechanisms are even
available with an integrated electro-mechanical paper cutter in it. All of these features make thermal
printers a right choice in a wide variety of applications.
This application report discusses the complete hardware and software required for a thermal printer
solution based on Texas Instruments Tiva™ controllers. Tiva controllers are 32-bit ARM® Cortex®-M4 80MHz processor core with IEEE754-compliant single-precision Floating-Point Unit (FPU), on-chip memory,
featuring 256 KB single-cycle Flash, 32 KB single-cycle SRAM; internal ROM loaded with TivaWare™ for
C Series software; 2KB EEPROM and several other features.
With all the above hardware features and the graphics library support available for Tiva controllers makes
it easy to do the text rendering and simultaneous printing required for thermal printing.
Project collateral and source code discussed in this application report can be downloaded from the
following URL: http://www.ti.com/lit/zip/spma071.
Contents
1
Introduction ................................................................................................................... 2
2
System Block Diagram ...................................................................................................... 3
3
Circuit Diagram ............................................................................................................... 3
4
Firmware ...................................................................................................................... 4
5
Theory of Operation ......................................................................................................... 6
6
Graphical User Interface .................................................................................................... 9
7
Thermal Printer Graphical Interface ..................................................................................... 10
Appendix A
Schematic .......................................................................................................... 12
List of Figures
1
System Block Diagram ...................................................................................................... 3
2
Flowchart - Part 1 ............................................................................................................ 4
3
Flowchart - Part 2 ............................................................................................................ 5
4
Software Flowchart .......................................................................................................... 6
5
Timing Chart for Using Fixed Six Divisions Printing..................................................................... 8
6
Thermal Printer Demo Interface .......................................................................................... 10
7
Schematic ................................................................................................................... 12
Tiva, TivaWare are trademarks of Texas Instruments.
Stellarisware is a registered trademark of Texas Instruments.
ARM, Cortex are registered trademarks of ARM Limited.
All other trademarks are the property of their respective owners.
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1
Introduction
1
Introduction
1.1
Specifications
•
•
•
•
www.ti.com
Main controller – TM4C1233H6PM 64 LQFP
Supporting chipsets
– DRV8834
– TS5A1066
– TPS76833
External connectivity Interfaces
– Universal Asynchronous Receiver/Transmitter (UART)
– Universal Serial Bus (USB)
Software features
– Support 2 inch thermal heads
– Can be extended easily for 3 inch printer head
– Wide support for fonts
• Multi-sized fonts
• Italics fonts
• Bold fonts
– Also support Image
– Architecture supports implementation of escape commands
This application report explains the working of the software and hardware required for building a thermal
printer solution.
The hardware for the system is designed around Texas Instruments TM4C1233H6PM Microcontroller. It is
a 80 Mhz processor with 256Kbytes of Flash and 32Kbytes of internal RAM. There are two motor driver
sections implemented in the system: one motor driver section for the printer motor and the other for the
paper cutter integrated to the printing mechanism. The motor driver sections are implemented using the
DRV8834 motor driver ICs from Texas Instruments. The hardware also provides the facility for
communication using UART and USB interfaces through the inbuilt peripherals available inside the
controller.
The thermal printer firmware is running in a foreground and background execution approach. It utilizes
various peripheral interrupts available in the microcontroller to achieve the performance. For example, the
design utilizes the UART interrupts for collecting the data from an external host, uses the timer interrupt
for accurately controlling the heating strobes of the printer mechanisms, and so forth. The font tables
(used for text rendering, and so forth) are stored in the built in Flash. The font tables are stored in a
compressed format for saving the application Flash. The images are stored in the form of C arrays.
The various functions performed by the firmware are listed below:
• Rendering of the text character received through the communication port to the printable image
• Logo printing using the onboard switch provided
• Font management by selecting the appropriate Font Table
• Increasing or decreasing the height of the printed text
• Increasing or decreasing the width of the printed text
• Precisely controlling the printing strobes as per the timing specification of the mechanism
• Auto cutter facility using the built-in paper cutter
• Provides a basic set of escape commands for data and commands
• Provision for adding more escape commands for data and commands
• Monitor the battery voltage of the system
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System Block Diagram
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2
System Block Diagram
DRV8834 for
Printer Motor
4-Wire/2-Wire
Serial Interface
Mini USB
Connector
Thermal Printer
Mechanism
TM4C1237
RS232
/TTL UART
TS5A1066
Printer Motor
Current Control
Power Supply
TPS76833
DRV8834 for
Cutter Motor
TI Components
Figure 1. System Block Diagram
3
Circuit Diagram
For the schematic details, see Appendix A.
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3
Firmware
4
Firmware
4.1
Flowchart
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Power On Reset
Initialize GPIO
Initialize UART
Initialize TIMER
Initialize ADC
Set the Font Table
Set the Max Character
Length and Width
Set the Max Character
Per Line
Set the <otor Driver
to Half Step Mode
Set the Motor Drivers
to Forward Direction
Mode
B
NO
Check for
Paper Roll
NO
ERROR LED ON
Check for Paper
YES
YES
ERROR LED OFF
Auto Feed the Paper
From Paper Roll
A
Figure 2. Flowchart - Part 1
4
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Firmware
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A
UART Interrupt Handler
If Graphics
Command
Received
YES
Set
Graphics
Mode
and
return()
If Graphics
Mode Enabled
NO
CALL graphicprint();
NO
If Print
Command
Received
YES
NO
If Paper CUT
Command
Received
YES
YES
Set Text
Print
Mode
and
return()
Set
CutFlag
and
return()
YES
Enable Corresponding
Flags or Settings and
return ()*
NO
YES
CALL text_print();
NO
If Switch 1
Pressed
NO
If any Escape
Commands
Received
If Text Print
Mode Enabled
return()
YES
CALLLogo_Print();
NO
If Switch 2
Pressed
YES
CALLLinefeed();
NO
If CutFlag Set
YES
CALL FullCut();
B
Figure 3. Flowchart - Part 2
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5
Theory of Operation
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ADC Interrupt Handler
Timer Interrupt Handler
Ÿ
Ÿ
Ÿ
Clear Timer Interrupt
Disable Timer
Clear Print Motor Flag
to Zero
Ÿ
Ÿ
Ÿ
Clear ADC Interrupt
Get the Values From
ADC Registers
Stor the Values to
Application Variables
Return()
Return()
Figure 4. Software Flowchart
5
Theory of Operation
5.1
General Information About Thermal Printers
Thermal printing is a non-impact method of creating images on paper and synthetic film. The process
applies heat from a thermal printhead onto thermal material. The base material used in the thermal
printing process may be selected from a variety of paper grades or synthetic films (PP, PE, or PET) with a
special chemical coating applied to one side to make it sensitive to heat.
Thermal printing has a number of important advantages over traditional printing processes; it is fast, clean,
quiet, reliable and easy to maintain. There are a limited number of mechanical parts, no messy ribbons or
toners, and no inking devices are needed to create the image.
Since thermal printers only have one or two moving components, they are very reliable and economical to
operate and maintenance costs are extremely low. The entire system is compact, simple to operate and
suitable for use in virtually all applications. Thermal printheads are usually much smaller and lighter than
the printing elements used by other imaging processes, so thermal printers are suitable when compact
size, portability and on-demand printing are needed. At the same time, a sharp and precise image of
excellent quality is produced consistently and quickly by properly matching the thermal paper to the
printhead by varying the chemical coating formulation.
In recent years, microprocessors have been installed to control printhead operation with major
improvements in image sharpness and clarity. A thermal printhead has a large number of tiny resistors,
which individually react to convert an electrical impulse into heat. The heat from the printhead on thermal
material creates a reaction with the chemical coating to produce an image. The image is produced within
milliseconds of contact and is normally black in color. The depth and range of colors may be produced by
varying the chemical formulation applied to the base material.
The quality and performance of thermal printing depends heavily on the careful matching of thermal
material to printhead equipment specification. As a result, a range of thermal materials is used across a
wide spectrum of thermal printers for different applications. To give the required physical characteristics
and properties, the type of base material - paper, board, or synthetic film - varies from application to
application, as does the thickness and weight of various base materials.
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Theory of Operation
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5.2
Specification of the Thermal Printer Head Used With This Document
The thermal printer mechanism used for this application report is from Seiko. The model number is
CAPD245D-E. It has a built-in auto-cutter mechanism integrated into it. Table 1 shows the electrical
specification for CAPD245D-E.
Table 1. Electrical Specification for CAPD245D-E
Specifications
CAPD245
Items
CAPD245D
CAPD345
CAPD245E
CAPD345D
CAPD345E
Printing method
Thermal dot lin printing
Total dots per line
384 dots
576 dots
Printable dots per line
384 dots
576 dots
Simultaneously activated dots
96 dots
Resolution
W 8 dots/mm x H 16 dots/mm
Paper feed pitch
0.03125 mm
Maximum print speed
100 mm/s *3
80 mm/s *3
Print width
48 mm
72 mm
Paper width
0
58 -1 mm
0
80 -1 mm
Thermal head temperature detection
Thermistor
Platen position detection
Mechanical switch
Out-of-paper detection
Reflection type photo interrupter
Cutter home position detection
Transmission type photo interrupter
Operating voltage range
VP line
VDD line
4.75 V to 9.5 V *4
2.7 V to 3.6 V, 4.75 V to 5.25 V
6.5 V to 9.5 V
2.7 V to 3.6 V, 4.75 V to 5.25 V
Printer current consumption
VP line
Thermal head drive
Motor drive
VPP line Thermal head logic
5.49 A max. (at 9.5 V) *5
0.60 A max.
0.10 A max.
5.40 A max. (at 9.5 V) *5
0.60 A max.
0.10 A max
Auto-cutter current consumption
VP line
Motor driving
0.70 A max.
Paper cutting method
Slide cutting
Type of paper cutting
Full cut and partial cut (1.5 ±0.5 mm tab left at the center)
Paper curling tendency
Fixed blade side and movable blade side
Minimum paper core diameter
ᶲ 8 mm
Minimum paper cutting length
10 mm
Cutting processing time
Approximately 1.0 s/cycle
Cutting frequency
1 cut/2 s maximum
Operating temperature range
-10°C to 50°C (non condensing)
5.3
96 dots
*2
Printer Drive Motor and Thermal Head Drive Method
The printer drive motor and the thermal head must be driven at the same time for printing. The printer has
half dot pitch thermal head, the pitch to the paper feed direction is one-half dot of the heat elements.
Configure 1 dot by 2 half dots.
The motor feeds the thermal paper for 1 dot line by the 4 steps. It is necessary to feed the thermal paper 4
steps and activate the thermal head once every 2 steps, to configure the 1 dot line.
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Theory of Operation
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Figure 5 describes the drive method as an example of the CAPD245 and shows a timing chart for using
fixed six divisions printing.
Figure 5. Timing Chart for Using Fixed Six Divisions Printing
5.4
Motor Driver Sections
The motor driver section is built around the DRV8834 dual-H-Bridge current-control motor driver ICs. It
has a built-in Indexer logic with simple STEP/DIRECTION control and up to 1/32-step micro-stepping. Due
to the availability of the indexer, the microcontrollers burden of driving the stepper motor in the printer
mechanism is totally off-loaded. Rather than generating the appropriate pulses using four output lines, the
microcontroller can now drive the stepper motor very easily using a single output line connected to the
STEP pin of DRV8834. Through this single control line, the microcontroller sends square pulses to turn
the motor as per the step size selected through the configuration pins in DRV8834. In this application, the
DRV8834 is configured to operate in half-step mode for each square pulse sent through the STEP input.
The cutter stepper motor is also operated in the same way explained above for the printer stepper motor.
5.5
RS232 Communication From External Host Board
This board has a RS232 conversion section available for sending and receiving signals from an external
host controller. This section is designed around the TI max3232 RS232 level converter.
There is also a provision for bypassing the rs232 converter IC section for connecting the TTL/CMOS level
directly. This can be done by mounting the R23,24,25,26 zero Ω resistor option on the board.
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5.6
Text Rendering and Data Transfer to the Printer Head
The main challenge in any thermal printer driver solution is the text rendering. Usually the text characters
to be printed on the paper will come through one of the communication interface like UART or USB. The
data received through the communication interface will be in ASCII format represented in 8-bit length. This
data has to be written to the thermal paper in the actual form of the character it represents, which is called
text rendering. A straight forward way to do this is to have a bitmap table stored inside the microcontroller
Flash and pick the corresponding bitmap from the character table. But the drawback of this approach is
the memory required to store the bit map tables.
Another innovative approach to address this issue is to use the bitmap tables in a compressed format.
This can be done easily in TIVA controllers with the help of Stellarisware® or Tivaware software library.
The compression and decompression of the bitmap is taken care of by the library. The application takes
the output of the library functions and remaps it in such a way that it can be sent to the printer for a proper
printing. All the required functions for doing the remapping is taken care of by the application code
provided with this application report.
The application uses the library functions for un-compressing the characters from the compressed bitmap
table. Then, the uncompressed character bitmaps are written to an internal memory location, which is
considered as a two dimensional plane. From there, the characters are picked by the data transfer routine
to send the bitmaps to the thermal printer head using an hardware SPI or an GPIO emulated SPI.
5.7
Temperature and Battery Monitoring
The battery voltage is fed to a resistor divider network and the voltage at the divider point is fed directly to
the microcontroller ADC pin. The microcontroller captures multiple samples of this voltage and stores the
information in the corresponding register for further use of the application.
The temperature of the printer head is measured using the built-in temperature sensor inside the printer
mechanism. A voltage is applied to the internal thermistor through a 10K resistor on board. The junction of
this external resistor and the internal thermistor is connected to the ADC pin of the microcontroller for
measuring the instantaneous temperature of the printing head to avoid damage and optimizing the speed.
5.8
Push Button Operation
There are two push buttons provided on the board named as SW1 and SW2.
• Pressing SW1 automatically prints a logo of Texas Instruments.
• Pressing SW2 does the paper feed function.
Indicator LEDs
There are two indicator LEDs provided for displaying various status signals:
• Led 1 is the indication for 3.3 V power.
• Led 2 is the indication for any error. For example, paper roll not present.
6
Graphical User Interface
To enable the quick evaluation of the thermal printer solution, a graphical user interface (GUI) is also
available along with this application. The GUI has developed using C# language from Microsoft. Using this
GUI, its very easy to send and receive commands and data to and from the printer. The communication
interface used here is the commonly available UART interface. All the built-in escape commands are
available as a function in the GUI.
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Thermal Printer Graphical Interface
7
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Thermal Printer Graphical Interface
Figure 6. Thermal Printer Demo Interface
Figure 6 shows the GUI for the Tiva thermal printer demo. Using this GUI, you can print sample text from
the comfort of a Windows-based PC . You can try various commands supported by the firmware by using
this interface. It supports multiple commands like cutting, double height printing, image printing, and so
forth. It also displays the command byte information it sent through the UART.
Before sending any commands, you have to select the appropriate com port number and enter it into the
box given on the right hand top corner and press the OK button. If the port is free and usable, the software
issues the message “PORT OPENED SUCCESSFULLY”. After this, you can start using the various
command buttons.
7.1
Button 1 – Print Sample Text
This button enters sample text in the text box provided above the button to directly print on the paper.
Enter the sample text and click on the “Print Sample Text” button.
7.2
Button 2 – Send Image
This button prints images through the uart channel. You can paste the graphics image data in the box
provided above this button. The image box accepts the Stellarisware compatible C array of the image.
You can directly copy and paste the Stellarisware compatible C array of the image and press the “Send
Image” button. The software transfers the data in multiple blocks if the image size is more than 104 lines,
which is equivalent to 5000 bytes of internal UART memory buffer.
7.3
Button 3 - GRAPHICS MODE ON
This button prints graphical data to the paper in a line-by-line basis. The number of lines of data to be
printed at a single instance is selected from the pull down menu adjacent to this button. The value can
range from 1 line to 255 lines. After the specified number of lines, the mode will automatically be
transferred to text mode.
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7.4
Button 4 – Double Height On
This button increases the height of the text printing. It will print the text in double size in height from
normal.
7.5
Button 5 – Double Height Off
This button reduces the height of text printing to normal size. It will cancel the effect of “DOBLE HEIGHT
ON” button.
7.6
Button 6 – Double Width On
This button increases the width of the text printing. It will print the text in double size in width from normal.
7.7
Button 7 – Double Width Off
This button reduces the width of text printing to normal size. It will cancel the effect of “DOBLE WIDTH
ON” button.
7.8
Button 8 – INTENSITY +
This button increases the darkness (intensity) of the printing. Each press on this button increase the
intensity by a small delta, which is equivalent to a delay of 1000 units of clock of the controller applied to
thermal head energizing.
7.9
Button 8 – INTENSITY This button decreases the darkness (intensity) of the printing. Each press on this button decrease the
intensity by a small delta, which is equivalent to a delay of 1000 units of clock of the controller applied to
thermal head energizing.
7.10 Button 9 – Full Cut
This button operates the built-in cutter to perform a full cut operation.
7.11 Button 10 – LIne Feed
This button pushes the paper to approximately 10 cms for a demonstration purpose. This length can easily
be adjusted in the firmware code.
7.12 Button 11 – GET SYSTEM VOLTS
This button collects the ADC value of the battery monitoring channel pin for implementing the intensity
control loop from a host machine through commands. It returns the 12-bit value of the ADC in hex format.
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11
A
B
C
STEP_P 1
2
1
2
3
4
5
JTAG
CON5
J2
FUSE
.1uF
C24
9
10
UART1CTS
UART1RTS
5
UART1TXD
UART1RXD
UART1RTS
UART1CTS
1
3
12
11
R23
R24
R25
R26
C1+
C1-
ROUT2
DIN2
ROUT1
DIN1
C27
.1uF
CON-USB-MINIB
8
9
8
9
UART1RXD
UART1TXD
USB
7
6
J7
3.3V
R27
0E
SW5
TACT SWITCH
TEST SWITCHES
7
6
C44
100uF
1E/1W
R30
TEST PRINT SWITCH
TMS
TCK
TDI
TDO
VM
4
5
0E
0E
0E
0E
UART1TXD_232
UART1RXD_232
UART1RTS_232
UART1CTS_232
.1uF
U3
EN
IN
IN
U1
C35
.1uF
C36
.1uF
D4
LED_RED
R29
330E
ERR LED
UART1TXD_232
UART1RXD_232
UART1RTS_232
UART1CTS_232
1
2
3
4
5
4
CON5
37
32
33
17
18
19
20
21
22
23
24
M1_C
M0_C
CLK
LAT
DI
M1_P
M0_P
60
59
6
7
8
9
DST6
DST5
DST4
DST3
DST2
DST1
J5
90_MA_EXCITATION 13
14
CUTS
15
PS
16
ERR LED
49
TDO
50
TDI
51
TMS
52
TCK
C34
.1uF
PGOOD
SW4
TACT SWITCH
C29
.1uF
R2
10K
7
8
5
6
R4
10K
3.3V
38
3.3V
FB/NC
PG
OUT
OUT
4
RST
TPS76833
2
C25
.1uF
14 UART1TXD_232
7 UART1RTS_232
13 UART1RXD_232
8 UART1CTS_232
C28
MAX3232CPW
U7
C2+
C2-
DOUT1
DOUT2
RIN1
RIN2
C26
.1uF
RS232
C30
100uF
3
4
POWER
GND
1
F1
SW6
TACT SWITCH
LF SWITCH
CON2
J8
VUSB
CON6
USBUSB+
D
1
2
3
4
5
6
1
3
1
3
2
4
2
4
1
3
1
3
2
4
2
4
VCC
VB
DD+
ID
GD
1
2
3
4
5
1
3
1
3
2
4
2
4
C38
.1uF
3.3V
D1
LED_RED
LM4F120B2QR
VBAT
WAKE
HIB
PA0/U0RX
PA1/U0TX
PA2/SSI0CLK
PA3/SSI0FSS
PA4/SSI0RX
PA5/SSI0TX
PA6
PA7
PE5
PE4
PE3
PE2
PE1
PE0
PC7
PC6
PC5
PC4
PC3/TDO/SWO
PC2/TDI
PC1/TMS/SWDIO
PC0/TCK/SWCLK
RST
C37
.1uF
C31
10uF
R5
330E
2
42
54
26
11
56
25
XOSC0
XOSC1
GNDX
OSC1
OSC0
PF4
PF3
PF2
PF1
PF0
PD7
PD6
PD5/USBDP
PD4/USBDM
PD3
PD2
PD1
PD0
PB7
PB6
PB5
PB4
PB3/I2C0SDA
PB2/I2C0SCL
PB1
PB0
C10
470PF
3.3V
34
36
35
R19
47K
TS5A1066
GND
NO
IN
V+
COM
3
3.3V
2
5
VM
1
2
3
4
5
6
7
8
9
10
11
12
R22
10K
R21
22K
J4
0545501271
1
2
3
4
5
6
7
8
9
10
11
12
C6
10PF
16Mhz
Y3
C43
2.2uF
R28
0E
VUSB
C7
10PF
C45
2.2uF
MCU - LM4F120
3
1K 1
U11
CUTTER INTERFACE
CUTS
BINV_C
BINV_C
AINV_C
AINV_C
BOUT_C
BOUT_C
AOUT_C
AOUT_C
STEP_C
DIR_C
HS
UART1CTS
UART1RTS
5
31
30
29
28
R20
430E
BATSENSE
THERMISTOR
3.3V
LF SWITCH
TEST PRINT SWITCH
USB+
USB-
10
53
44
43
64
63
62
61
C33
1uF
R32
3.57K
REFV_P R31
nSLEEP_P
nENBL/AENBL_P
STEP_P
DIR_P
nSLEEP_C
nENBL/AENBL_C
UART1TXD
UART1RXD
41
40
VREFO_P
90_MA_EXCITATION4
R33
27K
4
1
57
58
48
47
46
45
C32
2.2uF
R34
4.75K
REFV_C
R35
27K
VREFO_C
MOTOR CURRENT CONTROL
3
R13
.15E
R3
.15E
R14
.15E
R6
.15E
R16
10K
AINV_C
BINV_C
ADECAY_C
AOUT_C
nSLEEP_C
3.3V
BOUT_P
nENBL/AENBL_P
STEP_P
DIR_P
AINV_P
BINV_P
ADECAY_P
AOUT_P
3.3V
R18
36K
R11
36K
2
DRV8834
nSLEEP
BDECAY
ADECAY
AOUT1
AISEN
AOUT2
BOUT2
BISEN
BOUT1
nENBL/AENBL
STEP/BENBL
DIR/BPHASE
U8
VREFO
BVREF
AVREF
GND
VINT
VM
VM
VCP
nFAULT
CONFIG
M1
M0/APHASE
24
23
22
21
20
19
18
17
16
15
14
13
nFAULT_P
CONFIG_P
M1_P
M0_P
VREFO_P
REFV_P
REFV_P
VREFO
BVREF
AVREF
GND
VINT
VM
VM
VCP
nFAULT
CONFIG
M1
M0/APHASE
24
23
22
21
20
19
18
17
16
15
14
13
nFAULT_C
CONFIG_C
M1_C
M0_C
VREFO_C
REFV_C
REFV_C
3.3V
R12
10K
R10
300E
THERMISTOR
3.3V
1
FG
AINV_P
BOUT_P
AOUT_P
BINV_P
HS
PS
LAT
TH2
TH1
TH1
DST3
DST2
DST1
DST6
DST5
DST4
DI
CLK
Title
Date:
Size
C
J3
Monday, July 01, 2013
Document Number
<Doc>
1
Sheet
1
D3
LED_RED
R15
330E
C41
2.2uF
3.3V
D2
LED_RED
R7
330E
C39
2.2uF
3.3V
0541045031
1
2
3
4
5
6
7
8
9
10
11
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46
47
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49
50
1
TI THERMAL PRINTER REFERENCE DESIGN
1
2
3
4
5
6
7
8
9
10
11
12
13
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37
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39
40
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42
43
44
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46
47
48
49
50
C42
.1uF
C40
.1uF
VM
VM
PRINTER INTERFACE
TEST POINT
TP1
VM
3.3V
VM
MOTOR CONTROL - CUTTER
DRV8834
nSLEEP
BDECAY
ADECAY
AOUT1
AISEN
AOUT2
BOUT2
BISEN
BOUT1
nENBL/AENBL
STEP/BENBL
DIR/BPHASE
U9
MOTOR CONTROL - PRINTER
1
2
3
4
5
6
7
8
9
10
11
12
1
2
3
4
5
6
7
8
9
10
11
12
C9
C8
470PF 470PF
3.3V
BOUT_C
nENBL/AENBL_C
STEP_C
R17 DIR_C
330E
R9
330E
R8
10K
nSLEEP_P
3.3V
2
PPAD
25
J6
2
6
16
V+
VVCC
Copyright © 2014, Texas Instruments Incorporated
GND
Thermal Printer Reference Design Using TM4C1233H6PM
15
GNDA
3
VDDA
VDD
VDD
VDD
VDD
VDDC
VDDC
GND
GND
GND
GND
39
55
12
27
PPAD
12
25
5
of
1
Rev
<RevCode>
A
B
C
D
www.ti.com
Appendix A Schematic
Figure 7. Schematic
SPMA071 – March 2014
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