MAX7219 IC Serially Interfaced 8-Digit LED Display Driver
MAX7219 IC Seven Segment Dot Matrix Display Driver is a common-cathode display driver IC with serial inputs and output pins.
MAX7219 IC Seven Segment Dot Matrix Display Driver is a common-cathode display driver IC with serial inputs and output pins. It has an adjustable current capability which can be set using only one external resistor.
In addition to that, it has a four-wire serial interface that can be easily connected to all microprocessors. It can drive 64 individual LEDs connected at its output pins using only 4 wires by using Arduino. Furthermore, it can drive dot matrix displays, 7-Segments displays and bar graphs.
On top of that, max7219 ic has a built-in BCD decoder that makes it easy to use with seven segment numeric displays. Additionally, it has an 8×8 static RAM that we can use to store numbers. It is one of the most popular display driver IC.
The max7219eng are compact, serial input/ output common-cathode display drivers that interface microprocessors (μPs) to 7-segment numeric LED displays of up to 8 digits, bar-graph displays, or 64 individual LEDs. Included on-chip are a BCD code-B decoder, multiplex scan circuitry, segment and digit drivers, and an 8×8 static RAM that stores each digit.
Only one external resistor is required to set the segment current for all LEDs. The max7219 driver IC is compatible with SPI™, QSPI™, and MICROWIRE™, and has slew-rate-limited segment drivers to reduce EMI. A convenient 4-wire serial interface connects to all common μPs.
Individual digits may be addressed and updated without rewriting the entire display. The 7219 ic also allow the user to select code-B decoding or no-decode for each digit. The devices include a 150μA low-power shutdown mode, analog and digital brightness control, a scan-limit register that allows the user to display from 1 to 8 digits, and a test mode that forces all LEDs on.
- Operating voltage range: +4.0 to +5.5V
- Recommended operating voltage: +5V
- Maximum supply voltage: 6V
- Data-to-Segment Delay Time: 2.2mSec
- Maximum current allowed to draw through each segment pin: 100mA
- Maximum current allowed to through each DIGIT ground pin: 500mA
- Low power consumption
- Operating temperature: 0°C to +70°C
- Storage Temperature: -65°C to +150°C
MAX7219 IC applications:-
- General purpose SHIFT operation
- Measuring Instruments
- Digital Electronics
- Memory units
- Digital systems
MAX7219 IC Pin configuration
MAX7219 is a 24-pin IC available in different packages and is selected depending on the requirements. The description for each pin is given below.
|COMMON CATHODE OF DISPLAY SEGMENTS|
|2||DIG0- Common ground for all eight segments of DIGIT0|
|11||DIG1- Common ground for all eight segments of DIGIT1|
|6||DIG2- Common ground for all eight segments of DIGIT2|
|7||DIG3- Common ground for all eight segments of DIGIT3|
|3||DIG4- Common ground for all eight segments of DIGIT4|
|10||DIG5- Common ground for all eight segments of DIGIT5|
|5||DIG6- Common ground for all eight segments of DIGIT6|
|8||DIG7- Common ground for all eight segments of DIGIT7|
|19||V+- Power Supply|
|SHARED SEGMENT TERMINAL OF ALL EIGHT DIGITS|
|14||SEG A – SEGEMTENT A of all DIGITS|
|16||SEG B – SEGEMTENT B of all DIGITS|
|20||SEG C – SEGEMTENT C of all DIGITS|
|23||SEG D – SEGEMTENT D of all DIGITS|
|21||SEG E – SEGEMTENT E of all DIGITS|
|15||SEG F – SEGEMTENT F of all DIGITS|
|17||SEG G – SEGEMTENT G of all DIGITS|
|22||SEG DP – SEGEMTENT DOT of all DIGITS|
|1||DIN – Serial Data Input Pin|
|12||LOAD(CS) – Chip Select or Data shift pin|
|13||CLK – Clock Pin|
|24||DOUT – Pin used to Connect Second chip serially|
|18||ISET – current output adjust pin|
1 x MAX7219 IC Seven Segment Dot Matrix Display Driver
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