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MAX7221EWG from MAX,MAXIM - Dallas Semiconductor

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MAX7221EWG

Manufacturer: MAX, MAXIM

Serially Interfaced / 8-Digit LED Display Drivers

Partnumber Manufacturer Quantity Availability
MAX7221EWG MAX, MAXIM 523 In Stock

Description and Introduction

Serially Interfaced / 8-Digit LED Display Drivers The MAX7221EWG is a serial-input/output common-cathode display driver from Maxim Integrated (now part of Analog Devices). Below are the factual details about its specifications, descriptions, and features:

### **Specifications:**
- **Manufacturer:** Maxim Integrated (Analog Devices)  
- **Part Number:** MAX7221EWG  
- **Package:** 24-SOIC (Wide, 300 mil)  
- **Operating Voltage:** 4.0V to 5.5V  
- **Supply Current:** 150µA (typical, no load)  
- **Maximum Segment Current:** 40mA per segment  
- **Maximum Display Digits:** 8 (7-segment) or 64 individual LEDs  
- **Data Interface:** SPI-compatible serial interface  
- **Operating Temperature Range:** -40°C to +85°C  
- **Data Retention Voltage:** 2V (min)  
- **Clock Frequency:** Up to 10MHz  

### **Descriptions:**
The MAX7221EWG is a compact, serial-interfaced LED display driver capable of driving 7-segment numeric LED displays (up to 8 digits) or bar graph displays. It includes an on-chip BCD decoder, multiplex scan circuitry, segment drivers, and an SPI-compatible interface for easy microcontroller communication. It eliminates the need for external current-limiting resistors and supports individual LED brightness control.

### **Features:**
- **SPI-Compatible Serial Interface** (3-wire communication)  
- **On-Chip BCD Code-B Decoder** for 7-segment displays  
- **Multiplexed Display Control** (supports up to 8 digits)  
- **Individually Addressable Segments** (for custom patterns)  
- **Software-Controlled Brightness** (16-step digital control)  
- **Low-Power Shutdown Mode** (150µA standby current)  
- **Segment Drive Current:** 10mA to 40mA (adjustable via external resistor)  
- **Reverse Display Blanking** (clears display on power-up)  
- **ESD Protection:** ±15kV (Human Body Model)  

This information is sourced from the manufacturer's datasheet and technical documentation.

Application Scenarios & Design Considerations

Serially Interfaced / 8-Digit LED Display Drivers

Alternative Part Number

  • AS1107 --: Pin-compatible 8-digit LED display driver with the same SPI interface and register set as the MAX7221, widely used as a direct drop-in replacement.
  • TM1640 --: Similar 8-digit LED display driver with serial interface, suitable for display multiplexing applications where the MAX7221 is used.
  • ICM7218 --: 8-digit LED display driver with microprocessor interface, functionally comparable for driving 7-segment displays in similar designs.
  • ICM7218AIJI --: 8-digit LED display driver with similar multiplexed drive and serial interface, widely used as a MAX7221 substitute in display applications.
  • HD7279A --: Integrated LED display and keyboard scan driver with serial control, functionally comparable to the MAX7221 for 7-segment display driving.
  • TM1638 --: Serial LED display and key-scan driver offering similar multiplexed 8-digit display control at lower cost, suitable for equivalent display driver designs.

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