Abstract: This application note introduces a stock price display system based on the MAX6960 display driver and MAXQ2000 microcontroller (MAXQ20 core), and provides all the necessary information to build the system. These include circuit schematics, Windows software and microcontroller firmware. With the help of the free MAX-IDE (version 1.0, release date: November 18, 2004) development environment, an example firmware tailored specifically for MAXQ2000 was written in assembly language. MAX-IDE can be downloaded for free from the Maxim website.
Overview of the MAX6960 stock price display system The MAX6960 is a graphic LED, dot matrix display driver, capable of driving 8x8 LED dot matrix. This application note uses 20 MAX6960s to drive 20 8x8 LED dot matrix units and displays the Maxim stock price. Windows software and microcontroller firmware can be easily modified to display your company's stock price and stock code. Hardware overview The application circuit includes five cascaded MAX6960EVKIT and one MAXQ2000-KIT. Figure 1 shows the system hardware block diagram of the program.
Figure 1. Hardware block diagram of stock price display system
The MAX6960 EV kit contains four MAX6960s, four 8x8 LED dot matrix units, and all required passive components. The PCB layout has been verified. The circuit schematic of the MAX6960 evaluation board is shown in Figure 2. The MAXQ2000 is not installed on the MAX6960 evaluation board; it is necessary to connect the CS \, SCLK, DIN, DOUT, RESET \, and GND of the MAXQ2000 evaluation board to the first MAX6960 evaluation board. The other four MAX6960 evaluation boards are cascaded with the first MAX6960 evaluation board. In addition, the + 5V pad of the first MAX6960 EV kit must be connected to a + 5V power supply capable of delivering 5A. Table 1 shows the jumper settings required when using five cascaded MAX6960 EV kits.
More detailed schematic (PDF, 495kb)
Figure 2. Schematic of the MAX6960 EV kit (6 pages-1 page)
Table 1. Cascade 5 MAX6960 evaluation boards
Note: Bold text indicates that the default settings have been changed.
The MAXQ2000 evaluation board contains the complete software, hardware, sample code, and documentation required for designing with the MAXQ2000 microcontroller. See the data sheet for the MAXQ2000-KIT schematic diagram. Firmware Overview The sample MAX-IDE assembler file in Firmware.Zip allows the MAXQ2000 to communicate with the MAX6960 through the SPI interface. When the MAXQ2000 uses a 16MHz system clock, the SPI serial clock is 2.5MHz. Table 2 shows the initialization of all MAX6960 SPI / GPIO operations after power-up.
Table 2. Initializing all MAX6960 SPI / GPIO operations after power-up
Windows program overview After the MAX6960 is initialized, the firmware will wait for the Windows program shown in Figure 3 to obtain Maxim's stock price from the Yahoo website. This is using the / n Software â„¢ IP * Works! â„¢ Internet development component for Borland C ++ Builder Achieved. You can download free trial software and some demo programs from the / n Software website. You need to be connected to the Internet at all times for Windows programs to run properly. If you access the Internet through a proxy server, you need to provide the proxy server name and proxy port number. After the program runs, the Windows program automatically sends the latest stock price of MXIM (or another company you monitor) to the MAXQ2000 evaluation board through the RS-232 serial port every 10 seconds. If no proxy server information is needed to establish an Internet connection, the user does not need to click any button in the Windows program.
The data format of the RS-232 serial COM port is:
XXXU567.89X
X = Byte1 (Factory use only)
X = Byte2 (Factory use only)
X = Byte3 (Factory use only)
U = Byte4 (Stock Quote: Up, Down, or No Change Indicator)
5 = Byte5 (Hundreds Digit: 1xx.xx)
6 = Byte6 (Tens Digit: x1x.xx)
7 = Byte7 (Ones Digit: xx1.xx)
8 = Byte8 (Tenths Digit: xxx.1x)
9 = Byte9 (Hundredths Digit: xxx.x1)
X = Byte10 (Factory use only)
Figure 3. The Windows program obtains the stock price of MXIM via the Internet
Overview of the MAX6960 stock price display system The MAX6960 is a graphic LED, dot matrix display driver, capable of driving 8x8 LED dot matrix. This application note uses 20 MAX6960s to drive 20 8x8 LED dot matrix units and displays the Maxim stock price. Windows software and microcontroller firmware can be easily modified to display your company's stock price and stock code. Hardware overview The application circuit includes five cascaded MAX6960EVKIT and one MAXQ2000-KIT. Figure 1 shows the system hardware block diagram of the program.
Figure 1. Hardware block diagram of stock price display system
The MAX6960 EV kit contains four MAX6960s, four 8x8 LED dot matrix units, and all required passive components. The PCB layout has been verified. The circuit schematic of the MAX6960 evaluation board is shown in Figure 2. The MAXQ2000 is not installed on the MAX6960 evaluation board; it is necessary to connect the CS \, SCLK, DIN, DOUT, RESET \, and GND of the MAXQ2000 evaluation board to the first MAX6960 evaluation board. The other four MAX6960 evaluation boards are cascaded with the first MAX6960 evaluation board. In addition, the + 5V pad of the first MAX6960 EV kit must be connected to a + 5V power supply capable of delivering 5A. Table 1 shows the jumper settings required when using five cascaded MAX6960 EV kits.
More detailed schematic (PDF, 495kb)
Figure 2. Schematic of the MAX6960 EV kit (6 pages-1 page)
Table 1. Cascade 5 MAX6960 evaluation boards
| MAX6960 EV kit # 1 | MAX6960 EV kit # 2 | MAX6960 EV kit # 3 | MAX6960 EV kit # 4 | MAX6960 EV kit # 5 |
| JU1: (2-3) | JU1: (2-3) | JU1: (2-3) | JU1: (2-3) | JU1: (2-3) |
| JU2: (2-3) | JU2: (2-3) | JU2: (2-3) | JU2: (2-3) | JU2: (2-3) |
| JU3: (1-2) | JU3: (2-3) | JU3: (2-3) | JU3: (2-3) | JU3: (2-3) |
| JU4: (2-3) | JU4: (2-3) | JU4: (2-3) | JU4: (2-3) | JU4: (2-3) |
| JU5: (2-3) | JU5: (2-3) | JU5: (2-3) | JU5: (2-3) | JU5: (2-3) |
| JU6: (1 only) | JU6: (1 only) | JU6: (1 only) | JU6: (1 only) | JU6: (1-2) |
| JU7: (2-3) | JU7: (2-3) | JU7: (2-3) | JU7: (2-3) | JU7: (2-3) |
| JU8: (2-3) | JU8: (2-3) | JU8: (2-3) | JU8: (2-3) | JU8: (2-3) |
| JU9: (1-2) | JU9: (2-3) | JU9: (2-3) | JU9: (2-3) | JU9: (2-3) |
| JU10: (2-3) | JU10: (2-3) | JU10: (2-3) | JU10: (2-3) | JU10: (2-3) |
| JU11: (2-3) | JU11: (2-3) | JU11: (2-3) | JU11: (2-3) | JU11: (2-3) |
| JU12: (OPEN) | JU12: (SHORT) | JU12: (SHORT) | JU12: (SHORT) | JU12: (SHORT) |
| JU13: (1-2) | JU13: (2-3) | JU13: (2-3) | JU13: (2-3) | JU13: (2-3) |
| JU14: (1 only) | JU14: (1-2) | JU14: (1-2) | JU14: (1-2) | JU14: (1-2) |
| JU15: (1-2) | JU15: (1 only) | JU15: (1 only) | JU15: (1 only) | JU15: (1 only) |
| JU16: (1-2) | JU16: (1-2) | JU16: (1-2) | JU16: (1-2) | JU16: (1-2) |
| JU17: (1 only) | JU17: (1-2) | JU17: (1-2) | JU17: (1-2) | JU17: (1-2) |
Note: Bold text indicates that the default settings have been changed.
The MAXQ2000 evaluation board contains the complete software, hardware, sample code, and documentation required for designing with the MAXQ2000 microcontroller. See the data sheet for the MAXQ2000-KIT schematic diagram. Firmware Overview The sample MAX-IDE assembler file in Firmware.Zip allows the MAXQ2000 to communicate with the MAX6960 through the SPI interface. When the MAXQ2000 uses a 16MHz system clock, the SPI serial clock is 2.5MHz. Table 2 shows the initialization of all MAX6960 SPI / GPIO operations after power-up.
Table 2. Initializing all MAX6960 SPI / GPIO operations after power-up
| Step | OperaTIon | Register Address | DescripTIon |
| 1 | GPI RESET \ | N / A | RESET \ was held low for 2.5ms after power-up to properly apply power to all five MAX6960 devices while power is stable. RESET \ was then driven high for 100ms. |
| 2 | SPI: 16-bit address mode write | Panel ConfiguraTIon Register (0x0D) | Sets: iColor to bicolor, 1-bit per pixeli Take all MAX6960 devices out of shutdown |
| 3 | SPI: 16-bit address mode write | Global Driver Devices Register (0x0E) | Sets: iNumber of devices to 20. |
| 4 | SPI: 16-bit address mode write | Global Driver Rows Register (0x0F) | Sets: iNumber of rows to 2. |
| 5 | Delay | N / A | Adds a required 450ms delay after steps 1 through 4 above. All the MAX6960 devices require this TIme to properly configure themselves. |
| 6 | RS-232 serial COM port | N / A | Waits for stock quote bytes to be sent from the Windows program to the MAXQ2000 through the RS-232 serial COM port. |
The data format of the RS-232 serial COM port is:
XXXU567.89X
X = Byte1 (Factory use only)
X = Byte2 (Factory use only)
X = Byte3 (Factory use only)
U = Byte4 (Stock Quote: Up, Down, or No Change Indicator)
5 = Byte5 (Hundreds Digit: 1xx.xx)
6 = Byte6 (Tens Digit: x1x.xx)
7 = Byte7 (Ones Digit: xx1.xx)
8 = Byte8 (Tenths Digit: xxx.1x)
9 = Byte9 (Hundredths Digit: xxx.x1)
X = Byte10 (Factory use only)
Figure 3. The Windows program obtains the stock price of MXIM via the Internet
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