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Analog Devices Inc./Maxim Integrated MAX7219EWG+
- Part No.:
- MAX7219EWG+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Display Drivers
- Package:
- 24-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
MAX7219EWG+.pdf
- Description:
- IC DRVR 7 SEGMNT 8 DIGIT 24SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:581
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Product details
Overview
MAX7219EWG+ from Maxim Integrated is a serially interfaced, 8-digit common-cathode LED display driver IC with integrated BCD decoder, 8×8 static RAM, multiplex scan circuitry, and analog/digital brightness control. It operates from 4.0V to 5.5V, supports 10MHz SPI-compatible serial interface, delivers up to −40mA segment source current, and features 150μA shutdown mode with data retention. It is widely used in industrial panel meters and embedded LED display systems.
For engineers reviewing the MAX7219EWG+ datasheet, MAX7219EWG+ pinout, MAX7219EWG+ application, or MAX7219EWG+ equivalent, key selection considerations include its −40°C to +85°C extended temperature range, 24-pin wide SO package, slew-rate-unlimited segment drivers (distinguishing it from MAX7221), and compatibility with microprocessor-based 7-segment, bar-graph, or 64-LED matrix displays.
Technical Context
The MAX7219EWG+ implements an 8-digit multiplexed display controller with dual-port 8×8 SRAM for digit storage, on-chip BCD code-B decoder (configurable per digit), and programmable scan limit (1–8 digits). Its serial interface uses DIN/CLK/LOAD with 16-bit packet framing, where D8–D11 encode register address and D0–D7 carry data.
It features analog brightness control via external RSET (9.53kΩ typical for 40mA peak segment current) and digital intensity control via 4-bit pulse-width modulator (31/32 to 1/32 duty cycle steps). Shutdown mode halts the oscillator, pulls digit drivers to V+, and grounds segment sources - retaining register contents while drawing only 150μA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.0V to 5.5V - compatible with standard +5V logic rails and tolerant of ±10% variation |
| Segment Source Current | −40mA max at V+ = 5V - sets peak LED brightness and requires RSET = 9.53kΩ for nominal operation |
| Digit Sink Current | 320mA max per DIG line - supports high-brightness common-cathode displays with up to 8 digits |
| Serial Interface Speed | 10MHz max clock rate - enables fast update of all 8 digits with minimal μP overhead |
| Display Scan Rate | 500–1300Hz (8-digit typical 800Hz) - ensures flicker-free viewing without requiring external frame timing |
| Shutdown Current | 150μA - enables low-power standby while preserving display state in SRAM |
| Operating Temperature | −40°C to +85°C - qualified for industrial and automotive under-hood environments |
Pinout & Package
MAX7219EWG+ is housed in a 24-pin wide SOIC (SO) package (package code W24+1), RoHS-compliant, with 0.300" body width and standard 0.050" pitch. Both GND pins (pins 4 and 9) must be connected for stable operation and EMI control.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| DIN (1) | Serial data input | Latches 16-bit command packets on CLK rising edge; supports daisy-chaining via DOUT |
| DIG 0–DIG 7 (2,3,5–8,10,11) | Digit sink drivers | Active-low outputs that sink current from LED common cathodes; pulled to V+ when off |
| GND (4,9) | Power ground | Two dedicated ground pins required for low-noise segment/digit current return paths |
| LOAD (12) | Data latch strobe | Rising edge latches last 16 bits into digit/control registers; synchronous with CLK |
| CLK (13) | Serial clock input | Accepts up to 10MHz CMOS-level clock; shifts data on rising edge, clocks DOUT on falling edge |
| SEG A–G, DP (14–17,20–23) | Segment source drivers | Source current to LED anodes; grounded when off (not high-Z like MAX7221) |
| ISET (18) | Current reference input | Connects to V+ via RSET; sets segment current ≈ 100 × IISET |
| V+ (19) | Positive supply | +4.0V to +5.5V input; bypass with 10μF + 0.1μF capacitors near pin |
| DOUT (24) | Serial data output | CMOS-level output delayed by 16.5 clocks; enables cascading without external buffering |
Key Features
| Feature | Design Value |
|---|---|
| Individual digit addressing | Each of 8 digits updated independently via 16-bit register writes - no full-display rewrite needed |
| Decode/no-decode per digit | Configurable BCD code-B decoding (0–9,E,H,L,P,−) or raw segment mapping - supports mixed alphanumeric displays |
| Dual brightness control | Analog (RSET) + digital (4-bit PWM) intensity scaling - enables front-panel adjustment and software dimming |
| On-chip display memory | 8×8 dual-port SRAM retains digit data during shutdown - eliminates μP refresh overhead |
| Hardware test mode | Single-register activation forces all LEDs on - simplifies production testing and fault isolation |
| Power-up blanking | Resets all registers and blanks display on power application - prevents random segments lighting |
Applications
| Industrial Panel Meters | Embedded Equipment Displays |
|---|---|
Use Scenario: Real-time voltage, current, or pressure readouts in factory HMIs and instrumentation enclosures. IC Role / Device Role / Timing Role: Display controller managing 4–8 digit 7-segment LEDs with BCD decoding and programmable scan rate. Use Value: Eliminates discrete decoder/logic and reduces μP GPIO count; −40°C to +85°C rating ensures reliability in uncontrolled environments. |
Use Scenario: Status and parameter displays in medical devices, test equipment, and telecom chassis. IC Role / Device Role / Timing Role: Serial interface LED driver handling multiplexed digit updates and intensity control via SPI-like protocol. Use Value: Reduces firmware complexity with on-chip SRAM and register-based brightness/scan-limit configuration. |
| Bar-Graph Displays | LED Matrix Interfaces |
Use Scenario: Analog-style level indicators (e.g., audio VU meters, battery charge bars) using linear LED arrays. IC Role / Device Role / Timing Role: Segment driver repurposed as 64 individually controllable outputs (8 digits × 8 segments). Use Value: Enables precise bar-graph rendering without external shift registers; scan rate ensures smooth visual response. |
Use Scenario: Custom 8×8 monochrome LED matrices for signage, status boards, or prototyping platforms. IC Role / Device Role / Timing Role: Static RAM-based frame buffer driving rows/columns via digit/segment lines in multiplexed mode. Use Value: Provides hardware-managed multiplexing and intensity control - offloads timing-critical tasks from host MCU. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED display driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX7221EWG+ | Slew-rate-limited segment drivers; SPI/QSPI/MICROWIRE compliant; digit drivers high-impedance when off | Better EMI performance; required for strict SPI bus compliance; unsuitable where MAX7219's grounded-off segments are needed | Select MAX7221EWG+ for noise-sensitive or certified industrial designs requiring SPI timing rigor |
| TM1650 | 4-digit I²C interface; integrated key-scan; lower segment current (15mA); no BCD decode per digit | Reduced pin count and simpler wiring; limited to 4 digits and basic alphanumeric; lacks per-digit decode flexibility | Choose TM1650 for cost-sensitive, space-constrained consumer applications with ≤4 digits and I²C availability |
Compared with MAX7221EWG+, the MAX7219EWG+ offers faster segment switching and simpler load timing but higher EMI; versus TM1650, it provides greater digit count, flexible decode modes, and higher drive strength at the cost of SPI-only interface and larger footprint.
Availability
MAX7219EWG+ is available at Aetrix Electronics and suitable for industrial panel meters, embedded equipment displays, and LED matrix interfaces requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX7219EWG+ includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Maxim Integrated (now part of Analog Devices) designs precision analog, mixed-signal, and power management ICs for industrial, automotive, and communications markets.
The MAX7219 product line delivers compact, serially controlled LED display drivers optimized for microprocessor interfacing, offering integrated memory, decoding, and brightness control in a single 24-pin package.
FAQ
What is the operating temperature range of the MAX7219EWG+?
The MAX7219EWG+ is rated for −40°C to +85°C operation, making it suitable for industrial control panels, outdoor instrumentation, and automotive cabin applications where ambient temperatures exceed commercial-grade limits. This extended range is confirmed in the Ordering Information table and Absolute Maximum Ratings section of the official datasheet.
How does the MAX7219EWG+ differ from the MAX7221EWG+?
The MAX7219EWG+ differs from MAX7221EWG+ in two key ways: its segment drivers are not slew-rate limited (resulting in faster switching but higher EMI), and its serial interface uses LOAD strobe instead of CS - meaning it is not fully SPI-compliant. Digit drivers pull high when off, unlike the high-impedance off-state of MAX7221EWG+.
What external resistor value is required for 40mA segment current with the MAX7219EWG+?
A 9.53kΩ resistor between V+ and ISET sets nominal peak segment current to −40mA at +25°C, as specified in the Electrical Characteristics table and Selecting RSET Resistor section. This value assumes V+ = 5V and accounts for the 100× current gain from ISET to segment output.
Can the MAX7219EWG+ drive more than 8 digits?
Yes - multiple MAX7219EWG+ devices can be daisy-chained using DIN→DOUT connections and shared CLK/LOAD lines. The No-Op register (address 0xX0) allows selective addressing in cascaded configurations, enabling 16-, 24-, or more-digit displays with synchronized updates and uniform brightness control.
Does the MAX7219EWG+ retain display data during shutdown mode?
Yes - the MAX7219EWG+ retains all digit and control register contents in its on-chip 8×8 SRAM during shutdown mode, which draws only 150μA. The display blanks because segment sources are grounded and digit sinks are pulled to V+, but register values remain intact and immediately active upon exit from shutdown.
MAX7219EWG+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 24-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Display Type:
- LED
- Configuration:
- 7 Segment + DP
- Interface:
- 4-Wire Serial
- Digits or Characters:
- 8 Digits
- Current - Supply:
- 330 mA
- Voltage - Supply:
- 4V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-SOIC
MAX7219EWG+ FAQ
1.How can I place an order for MAX7219EWG+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX7219EWG+ on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for MAX7219EWG+ reliable?
The price and inventory of MAX7219EWG+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX7219EWG+ is usually 5 days.
3.What payment methods are accepted for MAX7219EWG+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX7219EWG+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX7219EWG+?
MAX7219EWG+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX7219EWG+ order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for MAX7219EWG+?
For technical support, including MAX7219EWG+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX7219EWG+ requirements.
6.How does Aetrix verify that MAX7219EWG+ is sourced from the original manufacturer or authorized distributors?
All MAX7219EWG+ products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that MAX7219EWG+ meets industry standards.
7.What is the process for return or replacement of MAX7219EWG+?
All MAX7219EWG+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX7219EWG+, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The MAX7219EWG+ part is unused and in its original packaging.
Return procedure for MAX7219EWG+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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