MAX7219EWG+T - Serially Interfaced 8-Digit LED Display Driver | ADI
Teilenummer: MAX7219EWG+T ✓ Aktiv| Menge | Stückpreis | Gesamt |
|---|---|---|
| 1 | $11.32 | $11,32 |
| 10 | $10.18 | $101,80 |
| 100 | $9.05 | $905,00 |
| 500 | $7.46 | $3.730,00 |
| 1.000 | $6.05 | $6.050,00 |
MAX7219EWG+T Übersicht
An LED display driver is an integrated circuit that takes low-current logic-level signals from a host controller and multiplexes them to drive a much larger array of discrete LEDs with the segment currents and refresh timing required for flicker-free human-vision operation. Inside the broader hierarchy of power management and display driver ICs, the MAX7219 belongs to the LED driver category, which itself sits under display drivers and interface ICs. Built on a CMOS process with on-chip BCD Code-B decoders, digit multiplexers, and an 8x8 static RAM scratchpad, the device replaces the bulky resistors, BCD-to-7-segment ICs, and external multiplexers that older designs required.
Key specifications include a single 5 V (typical, 4.0 V minimum to 5.5 V maximum) supply rail, segment drive current adjustable from approximately 2 mA to 40 mA through a single external resistor at the ISET pin (Radix-Digit drive of 320 mA per digit at 100% duty), 16-step digital brightness control via the duty cycle, 3-wire SPI/QSPI/MICROWIRE-compatible serial interface, and a built-in BCD decoder plus seven-segment decoder with 7-segment font plus decimal-point support. The MAX7219EWG is the extended-industrial / 0 C to +70 C version of the part; the MAX7219ENG variant is offered in a 24-pin PDIP. The on-chip error mode includes a Watchdog timer, scan-limit register, blanking, and segment-on/off commands that allow a host MCU to detect and clear faults without external glue logic.
Typical applications include industrial control panels with 8-digit numeric readouts, scoreboards, instrumentation front panels, point-of-sale terminals, Arduino/Raspberry-Pi-driven 7-segment matrix displays, and bar-graph or LED dot-matrix meters. The 24-pin SOIC package with 0.300 inch body width is friendly to hand-soldered prototypes and to reflow production, and the internal multiplex oscillator means the host MCU does not have to manage refresh timing. Engineering note: when stacking cascaded MAX7219 chains on long SPI lines, observe 50 ns tCP clock rise/fall limits and provide proper decoupling (10 uF + 0.1 uF) within 5 mm of the V+ pin to keep spike-induced register corruption out of the picture.
This page consolidates the manufacturer datasheet with real-time distributor pricing, drop-in compatible alternatives, and practical design notes not found in the official datasheet PDF.
Drop-in-Alternativen für MAX7219EWG+T – gleiches Gehäuse, Pin-kompatibel. Bauteile mit anderem Gehäuse, die eine PCB-Überarbeitung erfordern, sind ausgeschlossen.
Schnellvergleichstool – Wählen Sie Alternativbauteile für den Direktvergleich:
MAX7221EWG+T
✅ Drop-In📋 Referenzalternative (nicht im Katalog)
MAX7219CWG+
✅ Drop-In📋 Referenzalternative (nicht im Katalog)
MAX7219CWG+T
✅ Drop-In📋 Referenzalternative (nicht im Katalog)
MAX7219CNG+
✅ Drop-In📋 Referenzalternative (nicht im Katalog)
MAX7219EWG+T Grenzwerte & elektrische Eigenschaften
| Device Type | LED Display Driver |
| Display Type | Common-cathode, 7-segment numeric / bar-graph / 64 individual LEDs |
| Number of Digits Driven | 8 digits (max) |
| Number of Segments | 64 segments (max) |
| Schnittstelle | Serial, SPI/QSPI/MICROWIRE-compatible (3-wire) |
| Supply Voltage (V+) | 4.0 V to 5.5 V (5 V typical) |
| Versorgungsstrom | 330 mA (max) |
| Technology | CMOS, MOS |
| Segment Drive Current (per segment) | 2 mA to 40 mA programmable via RSET |
| Digit Drive Current | 320 mA per digit |
| Brightness Control | 16-step digital via internal duty-cycle modulation |
| Betriebstemperatur | 0 C to +70 C (extended-industrial grade) |
| Gehäuse / Bauform | 24-SOIC (Wide, MS-013, 0.300 inch / 7.5 mm body) |
| Anzahl der Pins | 24 |
| Montageart | Surface Mount (tape and reel) |
| MSL-Level | 1 (unlimited floor life) |
| RoHS-Status | Compliant |
| Lead-Free / Halogen-Free | Yes (per Maxim Integrated datasheet) |
MAX7219EWG+T Pin-Konfiguration
| Pin 1 | DIN — Serial data input (SPI MOSI) |
| Pin 2 | DIG 0 — Digit 0 driver (cathode) |
| Pin 3 | DIG 1 — Digit 1 driver (cathode) |
| Pin 4 | GND — Ground |
| Pin 5 | DIG 2 — Digit 2 driver (cathode) |
| Pin 6 | DIG 3 — Digit 3 driver (cathode) |
| Pin 7 | DIG 4 — Digit 4 driver (cathode) |
| Pin 8 | DIG 5 — Digit 5 driver (cathode) |
| Pin 9 | V+ — Positive supply, 5 V typical |
| Pin 10 | DIG 6 — Digit 6 driver (cathode) |
| Pin 11 | DIG 7 — Digit 7 driver (cathode) |
| Pin 12 | LOAD/CS — Chip select / load (active low) |
| Pin 13 | CLK — Serial clock |
| Pin 14 | SEG E — Segment E anode driver |
| Pin 15 | SEG F — Segment F anode driver |
| Pin 16 | SEG G — Segment G anode driver |
| Pin 17 | SEG D — Segment D anode driver |
| Pin 18 | ISET — Segment current set via RSET to GND |
| Pin 19 | SEG C — Segment C anode driver |
| Pin 20 | SEG B — Segment B anode driver |
| Pin 21 | SEG A — Segment A anode driver |
| Pin 22 | DP — Decimal-point anode driver |
| Pin 23 | SEG SEG2 — Reserved analog segment |
| Pin 24 | DOUT — Serial data out (to next MAX72xx in chain) |
Typische Anwendungen
MAX7219EWG+T ist geeignet für 7 Anwendungs: Industrial Control Panel 7-Segment Readout, 8-Digit Scoreboard / Stadium Display Driver, Bench Test & Measurement Instrumentation Display, Arduino / Raspberry Pi 8x8 LED Matrix Controller, Point-of-Sale Terminal Numeric Keypad Display, Bar-Graph Audio / RF Level Meter, Design Notes: Cascaded Display Chains.
Industrial Control Panel 7-Segment Readout
The MAX7219EWG+T fits industrial control panel readouts because its 5 V supply, 8-digit multiplexed drive, and 16-step digital brightness handle multi-digit numeric displays without external decoder or mux chips. The internal BCD Code-B decoder reduces the host MCU's firmware footprint, while the on-chip watchdog and segment-off commands let a microcontroller catch and clear LED failure modes without external glue logic. Use a 49.9 kOhm RSET and the maximum intensity (0x0F) code to keep the eight-digit display flicker-free at 5 V.
Empfohlen
8-Digit Scoreboard / Stadium Display Driver
Scoreboards with eight 7-segment digits per side benefit from the MAX7219EWG+T's 320 mA per-digit drive current and 4.0-5.5 V supply flexibility, allowing each player score to be served by a single IC. Cascading up to eight parts lets one SPI bus drive a 64-digit display, reducing PCB area versus discrete BCD-to-7-segment-plus-mux designs. Design tip: drop a 22 ohm series resistor on each segment line when driving outdoor-size displays to dampen transmission-line ringing under multiplexing.
Empfohlen
Bench Test & Measurement Instrumentation Display
Bench multimeters, frequency counters, and bench power supplies typically need a 4 to 8 digit numerical readout on the front panel, and the MAX7219EWG+T drives the digits directly from a single 5 V logic rail with no extra decoder. The 16-step digital brightness control lets the front panel meet dark-room contrast requirements without a separate analog bias. Use the BCD 'no-decode' mode (0x09 0x00) to access the 7-seg-plus-DP raw control when displaying engineering-unit symbols like u, m, k, V, A, or Hz.
Empfohlen
Arduino / Raspberry Pi 8x8 LED Matrix Controller
When paired with the standard Arduino LedControl library or Raspberry Pi SPI library, the MAX7219EWG+T serves as a drop-in controller for 8x8 LED dot matrices used in hobby projects, message boards, and maker cubes. Its internal scan-oscillator eliminates the need for an external refresh timer, freeing the host MCU from interrupt overhead. For larger 16x16, 32x8, or scrolling displays, multiple MAX7219EWG+T parts can be cascaded on the same SPI bus using the on-chip No-Op register (0x00 0x00) for cascading.
Empfohlen
Point-of-Sale Terminal Numeric Keypad Display
Point-of-sale terminals showing total, change, and item count rely on the MAX7219EWG+T's serial-only interface to keep GPIO count low on the host system, while the built-in BCD decoder reduces firmware complexity for displaying 0-9 digit updates. Per-driver current limit of 40 mA per segment and 320 mA per digit is well-matched to standard 7-segment LEDs in cash registers. Note: the MAX7221EWG+T is sometimes preferred for POS designs that need stricter SPI mode 0/0 handling for payment-grade host firmware.
Empfohlen
Bar-Graph Audio / RF Level Meter
Bar-graph audio level meters, RF field-strength meters, and battery fuel gauges use the MAX7219EWG+T to drive 8 to 64 discrete LEDs as a bar graph or dot-mode from a single SPI register write per frame update. Its internal scan logic lets the host MCU sample and compute RMS or peak levels in software, then push a single register-write burst without managing timing. Select single-digit 'no-decode' mode (0x09 0x00) and use the digital intensity register to avoid variable-frequency PWM-induced flicker.
Empfohlen
Design Notes: Cascaded Display Chains
When cascading two or more MAX7219EWG+T devices to drive larger arrays, use the No-Op register (0x00 0x00) on every part other than the one you intend to address, and tie all LOAD lines together for synchronous latching across the chain. Place 10 uF electrolytic and 0.1 uF ceramic capacitors within 5 mm of each V+ pin; long cable runs between chained parts benefit from a 100 ohm series damping resistor on each segment line. Pinout DOUT-pin 24 should be daisy-chained to DIN-pin 1 of the next part without any external buffering when chain length stays below 200 mm.
Zusammenfassung der empfohlenen Produkte
Technische Referenzdaten für MAX7219EWG+T – Vergleich, Designhinweise und Compliance-Informationen.
Auswahlhilfe
Vergleich mit Alternativen
| Parameter | Dieses Produkt | MAX7221EWG+T | MAX7219CWG+ | MAX7219CWG+T | MAX7219CNG+ |
|---|---|---|---|---|---|
| Brand | Analog Devices (formerly Maxim Integrated) | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Package | 24-SOIC (Wide, 7.5 mm body) | 24-SOIC (Wide, 7.5 mm) - same | 24-SOIC (Wide, 7.5 mm) - same | 24-SOIC (Wide, 7.5 mm) - same | PDIP-24 (through-hole) - different package (NOT drop-in for SOIC-24 sockets) |
| Interface | Serial SPI / QSPI / MICROWIRE-compatible (3-wire) | SPI-only (mode 0/0) | Serial SPI / QSPI / MICROWIRE-compatible | Serial SPI / QSPI / MICROWIRE-compatible | Serial SPI / QSPI / MICROWIRE-compatible |
| Supply Voltage | 4.0 V to 5.5 V (5 V typ) | 4.0 V to 5.5 V | 4.0 V to 5.5 V | 4.0 V to 5.5 V | 4.0 V to 5.5 V |
| Number of Digits | 8 | 8 | 8 | 8 | 8 |
| Operating Temperature | 0 C to +70 C | 0 C to +70 C | 0 C to +70 C | 0 C to +70 C | 0 C to +70 C |
| Mounting Type | SMD (Tape and Reel) | SMD (Tape and Reel) | SMD (Tube) | SMD (Tape and Reel) | Through-Hole |
Wichtigste Unterscheidungsmerkmale
- Wider interface mode compatibility (vs. MAX7221EWG+T)
- SMD tape-and-reel availability (vs. MAX7219CWG+)
- Higher segment/refresh speed for industrial SPI noise immunity (vs. MAX7219CNG+)
Designhinweise
Place a 10 uF electrolytic (or tantalum) plus a 0.1 uF ceramic bypass capacitor within 5 mm of the MAX7219EWG+T V+ pin (pin 9) and a separate 0.1 uF within 5 mm of the GND pin (pin 4). The on-chip multiplex driver generates brief V+ current spikes of 320 mA per digit during scan transitions; insufficient decoupling causes SPI register corruption that shows up as a flickering or partially-lit digit. A bulk cap on the 5 V rail reduces this by forcing supply integrity through the multiplex.
Route CLK, LOAD, and DIN traces as parallel matched lengths or daisy-chain when using multiple chained MAX7219EWG+T parts to minimize clock-skew on long SPI busses. Estimated: at 10 MHz SPI clock on a 200 mm daisy chain, skew can exceed 1 ns and cause data-shift errors; adding 100 ohm series damping resistors at the segment and digit lines suppresses transmission-line ringing that becomes visible as ghosting on adjacent digits.
When the SPI host is on a separate PCB from the MAX7219EWG+T, use a 5 V-tolerant logic buffer like 74HC125 on the CLK/LOAD/DIN lines to prevent overshoot/undershoot reaching the IC's ESD diodes. Ensure tCP clock low + clock high total is greater than the 50 ns minimum specification from the Analog Devices datasheet, since microcontrollers in low-power modes sometimes violate timing at sub-3.3 V IO levels. Use level-shifters when 3.3 V microcontrollers drive the 5 V MAX7219EWG+T directly.
Estimated: connecting an LED display with forward voltage (Vf) above 5 V to SEG A-G pins can back-bias the segment output, draw excessive current through the on-chip drivers, and physically damage the MAX7219EWG+T. If your LEDs require more than 5.5 V VF (e.g. high-brightness white or blue strings), use external MOSFET drivers and the MAX7219EWG+T only as a low-side mux controller. Another common pitfall is failing to write the display-test register (0x0F 0x00) once after power-up, which can leave the part in shutdown mode and display nothing despite correct segment drive current.
Compliance-Informationen
RoHS-compliant per Maxim Integrated datasheet. Not AEC-Q100 qualified for automotive applications. The package contains NO/NC pins (pin 23 reserved analog SEG2).
