Features
- (4) MAX7219 8 digits, 7 Segment display modules
- 32 digits
- Can display decimal, hex values, some text values
- Each display has 8 of 7 segment LED displays
- "Blue" card
- 3.3V interface operation
- Requires both 3.3V and 5V power supplies
- 8 pin connector
- 95x95mm ODAS form factor
- (4) 6-32 mounting holes
J1 Connector
- 3.3V signal level
- 5V power to LEDs
- 1x8 right angle header mounted on rear of card
- GND
- GND
- DOUT
- CLK
- CS
- DIN
- 3.3V
- 5V
Programming
Arduino Drivers
Arduino Example Code
LBMAX7219X4_ADDR
- LBMAX7219X4_ADDR
- void writeHexDigit(uint8_t rowVal, uint8_t colVal, uint8_t digitVal) - Write Hexadecimal digit to location
- 8 columns, 4 rows
- rowVal = 0 is top row in display
- colVal = 0 = left character
LBMAX7219X4
- LBMAX7219X4
- Displays Land-Boards channel intro video across the LEDs on 4 rows of 8-digits MAX7219X4 card
- "LAND-" (first line)
- "BOARDS" (second line)
- "PRESENTS" (third line)
- "CARDS...", "AND CODE" (4th line)
VHDL Code
instance: MAX7219
generic map(
devices => 2,
intensity => (16#1#, 16#3#)
)
port map (
clk => clock,
data_vector => x"FEDCBA9876543210",
clk_out => MAX7219_CLK,
data_out => MAX7219_DATA,
load_out => MAX7219_LOAD,
reset_n => globalResetN
);
Test
- Test single 8-digit modules
- Test MAX7219X4 card with (4) 8-digit modules
Test Single Modules
SenShld
|
Desc
|
MAX J1
|
Color
|
VCC
|
VCC
|
1
|
RED
|
GND
|
GND
|
2
|
BLK
|
D12
|
DATAIN
|
3
|
WHT
|
D10
|
CS
|
4
|
BRN
|
D11
|
CLK
|
5
|
YEL
|
Test MAX7219X4 Card
Signal
|
AiB
|
MAX7219X4
|
Signal
|
Color
|
GND
|
J5-25
|
J1-1
|
GND
|
BLK
|
D10
|
J5-21
|
J1-5
|
CS
|
WHT
|
D11
|
J5-19
|
J1-4
|
CLK
|
YEL
|
D12
|
J5-17
|
J1-6
|
DIN
|
BLU
|
+3.3V
|
J5-1
|
J1-7
|
+3.3V
|
RED
|
VFILT
|
J9-1
|
J1-8
|
5V
|
ORG
|
"Red" Modules
- Incompatible pinouts
- Flipped from blue modules
Mechanicals
Revision History
Rev 2
- Add 5V interface connector - J2
- Card can be driven from one of the two interfaces
- 5V interface does not require 3.3V
- +5V
- DIN
- CS
- CLK
- DOUT
- GND
Rev 1
- Works
- Requires 3.3V power and signal levels
- Requires 5V power
Assembly Sheet