GTT38A Hardware Manual Revision 1.0 PCB Revision: 2.
Revision History Revision 1.
Contents 1 Introduction ............................................................................................................................................... 1 2 Features ..................................................................................................................................................... 2 3 Ordering ..................................................................................................................................................... 3 3.
5.4 Factory Defaults ................................................................................................................................ 11 6 Appendix .................................................................................................................................................. 12 6.1 Dimensional Drawing ........................................................................................................................ 12 6.2 Power Consumption.............................
Figure 1: The GTT38A Display 1 Introduction The Matrix Orbital GTT38A is a 1U form factor, full colour TFT display with an integrated touch screen, crafted to become a crisp, controllable canvas for creativity. Utilizing an extended version of our widely used command library and industry standard communication protocols, the customizable GTT38A series contains an intelligent display that will quickly become the gorgeous face of your application.
2 Features In addition to a beautiful full-colour TFT screen, seamless incorporation of a touch panel provides sleek user input while a small piezo speaker and vibratory motor can offer audio and tactile feedback for a completely interactive experience. Storage of fonts and bitmaps within the swappable onboard SD memory card allows for a co-ordinated appearance in any design.
3 Ordering The innovative GTT38A, with all of the features mentioned above, is available in various voltage and communication options to provide a sleek touch of creativity to any project. 3.1 Ordering Part Numbering Scheme Table 1: Part Numbering Scheme GTT 38 A -TPR -BLH -B1 -H1 -CU -V5 1 2 3 4 5 6 7 8 9 3.
3.3 Recommended Parts Serial Communication The most common cable choice for the any GTT display, the Extended Communication/ Power Cable offers a simple connection to the unit with familiar interfaces. A DB9 and floppy power header provide all necessary input to communicate to and power your display. Figure 3: ESCCPC5V I2C Communication For a more flexible interface to the GTT, especially with the I2C protocol, a Breadboard Cable may be used.
4 Hardware 4.
4.2 Extended Serial Communication/Power Header The communication/power header provides an interface for the two most common GTT38A protocols: RS232 and TTL. With the ability to connect to a PC serial port or microcontroller and optional hardware flow control, this is the most versatile header available on the GTT38A.
4.1 Alternate Power Connector The Alternate Power Connector provides the ability to power the GTT38A using an alternate cable*. This feature can supply additional power to the GTT that your USB connection alone cannot provide, especially when peripherals such as the piezo buzzer, motor and GPOs are used.
4.2 I2C Communication/Power Header A dedicated I2C header is available on RS232 and TTL GTT38A models and provides the most basic protocol connection to the unit. 2 Table 7: I C Communication/Power Pinout Pin 1 2 3 4 2 Function Vcc SCL SDA Gnd Figure 13: I C Communication/Power Header Voltage is applied through pins one and four of the header, please reference the electrical specifications before applying power.
4.3 Mass Storage Mini-B USB Header The GTT38A comes with a secondary Mini-B USB connector to access the SD memory card as a mass storage device for easier access to the files contained on the card. Table 8: Mass Storage USB Pinout Figure 14: Mass Storage USB Connector Pin 1 2 3 5 Function Vcc DD+ Gnd The mass storage jumper must be placed to use this function, please refer to the Mass Storage Mode section for further information.
4.4 General Purpose Outputs A unique feature of the GTT38A is the ability to control relays* and other external devices using either one of six General Purpose Outputs. Table 9: GPO Pinout Pin 1 2 3 4 5 6 7 8 Function Gnd GPO 1 GPO 2 GPO 3 GPO 4 GPO 5 GPO 6 Vcc Pin 8 9 10 11 12 13 14 16 Function Gnd Gnd Gnd Gnd Gnd Gnd Gnd Gnd Figure 15: GPO Header Each can source up to 15mA of current at five volts when on, or sink 15mA at zero volts when off.
5 Troubleshooting 5.1 Power To function correctly, the GTT38A must be supplied with the appropriate power. If the power LED near the top right corner of the board is not illuminated, power is not applied correctly. Try the tips below. GTT devices have specific power requirements. Ensure the correct voltage and sufficient current are available to your device by consulting the Power Consumption table. Check the power cable which you are using for continuity.
6 Appendix 6.
6.2 Power Consumption 6.3 Environmental Table 11: Required Supply Voltage Parameter Min Typ Max Unit Supply Voltage 4.75 5.0 5.25 V 9.0 12.0 35.
Communication Characteristics Table 18: RS232 Interface Characteristics Min Parameter Input Threshold Low 0.6 Input Threshold High Output Voltage Swing ±5.0 Input Resistance 3 Output Resistance 300 Output Short Circuit Current - Typ Max Unit 1.2 V 1.5 2.4 V ±5.4 V 5 7 kΩ 10M Ω ±35 ±60 mA Table 19: USB Interface Characteristics Parameter Min Typ Max Unit Static Output High Static Output Low Input Differential Threshold 2.8 0.2 Common Mode Output Voltage 0.8 Driver Output Impedance 2 26 - 3.6 0.
7 Definitions 9-Slice: Graphic format used to scale bitmaps, usually rectangular, without distorting their geometry. Nine regions define the object center, four corners, and four sides for accurate up or down scaling. ASCII: American standard code for information interchange used to give standardized numeric codes to alphanumeric characters. BPS: Bits per second, a measure of transmission speed. GUI: Graphical user interface.
