MAX7221CWG+

Display Drivers Overview

The MAX7221CWG+ is a compact, serially interfaced common-cathode LED display driver manufactured by Analog Devices Inc./Maxim Integrated. It interfaces microprocessors to 7-segment numeric LED displays of up to 8 digits, bar-graph displays, 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 operates within a supply voltage range of 4 V to 5.5 V, with a maximum power dissipation of 941 mW. The component supports SPI, QSPI, and MICROWIRE interfaces and is housed in a 24-pin SOIC package.

Display Drivers Feature Summary

• Integrates on-chip BCD code-B decoder and multiplex scan circuitry for simplified system design
• Includes 8x8 static RAM to store each digit data independently
• Supports serial communication via SPI, QSPI, and MICROWIRE protocols
• Requires only one external resistor to set segment current for all LEDs

Display Drivers Applications

• Driving 7-segment numeric LED displays up to 8 digits
• Controlling bar-graph displays
• Managing arrays of up to 64 individual LEDs

Display Drivers Procurement Notes

Verify the exact ordering suffix against the manufacturer's datasheet to ensure correct packaging and temperature grade. Confirm RoHS compliance status as indicated in official documentation. Check for availability constraints or limited stock notices from authorized distributors. Ensure the SOIC-24 package matches your PCB footprint requirements before finalizing procurement orders.

Display Drivers Selection Notes

Select this component when a serial interface is preferred over parallel connections to reduce microprocessor pin usage. It is suitable for applications requiring integrated decoding and multiplexing without external logic. Consider the 4 V to 5.5 V operating range for compatibility with standard logic levels. Verify that the required number of segments and digits does not exceed the 8-digit/64-segment capacity.

Display Drivers Part Context

The MAX7221 belongs to the MAX7219/MAX7221 family of serially interfaced LED display drivers. While functionally similar to the MAX7219, the MAX7221 offers specific interface compatibility features. Both devices share core functionalities like internal decoding and RAM storage but may differ in specific electrical characteristics or interface signaling details defined in their respective datasheets.

Display Drivers Replacement Considerations

The MAX7219C/D is a related part within the same family offering similar 8-digit driving capabilities. Verify interface compatibility and electrical specifications before substitution. Ensure the replacement part meets the required package type and operating temperature range for your specific application environment.