MAX7221EWG+

Display Drivers Overview

The MAX7221EWG+ is a serially interfaced, 8-digit LED display driver manufactured by Analog Devices Inc./Maxim Integrated. It interfaces microprocessors to common-cathode displays including 7-segment numeric LEDs, bar-graphs, or 64 individual LEDs. The device integrates a BCD code-B decoder, multiplex scan circuitry, segment and digit drivers, and an 8x8 static RAM for digit storage. It supports SPI, QSPI, and Microwire interfaces with slew-rate limited drivers to reduce EMI. Operating voltage ranges from 4V to 5.5V, with a maximum supply current of 330mA. Output currents are specified at -45mA (high) and 320mA (low). It operates within a temperature range of 0°C to +70°C in a 24-pin SO package.

Display Drivers Feature Summary

• Slew-rate limited segment drivers designed to minimize electromagnetic interference
• Compatible with SPI, QSPI, and Microwire serial communication protocols
• Integrated BCD decoder and multiplex scan circuitry for simplified control
• Digital and analog brightness control capabilities

Display Drivers Applications

• Bar-Graph Displays
• 7-Segment Displays
• Industrial Controllers
• Panel Meters
• LED Matrix Displays

Display Drivers Procurement Notes

Verify the suffix 'EWG+' indicates the specific SOIC-24 package variant and lead-free compliance status. Confirm the manufacturer is Analog Devices Inc. or Maxim Integrated. Ensure the component matches the commercial grade temperature range specifications. Cross-reference the datasheet revision to confirm interface compatibility requirements.

Display Drivers Selection Notes

Select this component when EMI reduction is critical due to its slew-rate limited drivers. Choose it over standard variants if SPI, QSPI, or Microwire interface flexibility is required. Verify that the 8-digit capacity and common-cathode drive capability align with the target display architecture. Ensure the operating voltage range matches the system power supply.

Display Drivers Part Context

This part belongs to the MAX7219/MAX7221 family of compact display drivers. While functionally similar to the MAX7219, the MAX7221 variant specifically includes slew-rate limiting for lower EMI and broader serial interface support. It serves as a high-integration solution for managing multiple LED segments without requiring external decoding logic or scanning transistors.

Display Drivers Replacement Considerations

MAX7219EWG+ is a functional alternative but lacks slew-rate limiting and specific interface compatibility features found in the MAX7221 series.