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MAX7219CNG+

8-digit LED display driver, 10MHz SPI, BCD decoder, 40mA/seg, PDIP-24, daisy-chainable

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Manufacturer Part：

MAX7219CNG+

Package：

PDIP-24 Narrow (0.3in, 7.62mm width)

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Description

Product Overview

The MAX7219CNG+ from Analog Devices (Maxim Integrated) is a compact serial-input/output common-cathode display driver that interfaces microprocessors to 7-segment numeric LED displays of up to 8 digits, bar-graph displays, or 64 individual LEDs. Included on-chip are a BCD code-B decoder, multiplex scan circuitry, segment and digit drivers, and an 8×8 static RAM, requiring only one external resistor to set the segment current.

Key Specifications

Supply Voltage 4.0 V to 5.5 V
Max Data Rate 10 MHz serial interface
Display Support 8 digits (7-segment) or 64 LEDs
Segment Current Range 0 to 40 mA (set by RSET)
Digit Drive Sink Current 320 mA (max)
Display Scan Rate 800 Hz (typ) at 8 digits
Shutdown Current 150 uA (max)
Operating Temperature 0C to +70C

Features

  • 10 MHz serial interface for high-speed display data loading
  • Built-in BCD code-B decoder with no-decode option per digit
  • 8×8 static RAM stores digit data without refresh overhead
  • Only one external resistor (RSET) sets segment current for all LEDs
  • Digital and analog brightness control (16 levels via PWM or RSET)
  • 150 uA low-power shutdown mode with data retention
  • Daisy-chainable via DOUT for multi-device cascading

Applications

  • 7-segment LED display panels and panel meters
  • Bar-graph display indicators
  • LED matrix display modules
  • Industrial controller status displays

The MAX7219CNG+ from Analog Devices (Maxim Integrated) is a compact serial-input/output common-cathode display driver in a 24-pin narrow DIP package. It interfaces microprocessors to up to 8 digits of 7-segment LED displays, bar-graph displays, or 64 individual LEDs through a simple 4-wire serial interface (DIN, CLK, LOAD, DOUT). The device integrates a BCD code-B decoder, multiplex scan circuitry, segment and digit drivers, and an 8×8 static RAM that stores each digit. Only one external resistor (RSET) is required to set the peak segment current for all LEDs. Features include 16-level digital brightness control, scan limit register (1-8 digits), and 150 uA shutdown mode with data retention. The DOUT pin enables daisy-chaining multiple MAX7219 devices.

The MAX7219CNG+ operates as a multiplexed LED display controller with serial data input. (1) Serial Interface: Data is loaded into a 16-bit shift register via DIN on the rising edge of CLK. Each 16-bit word consists of an 8-bit register address (D8-D15) and 8-bit data (D0-D7). The LOAD pin latches the data on its rising edge. Multiple devices can be daisy-chained using the DOUT pin. (2) Multiplex Scan: An internal oscillator drives the multiplex scanning at approximately 800 Hz for 8 digits, fast enough to appear flicker-free. Each digit is driven for 1/8 of the scan cycle with peak segment current set by RSET. (3) Brightness Control: Digital brightness is controlled via the intensity register, which uses PWM to set the duty cycle of the segment drivers from 1/16 to 31/32 in 16 steps. (4) Decode Mode: The decode-mode register selects BCD code-B decoding or no-decode for each digit independently. BCD mode automatically maps 0x0-0xF to 7-segment patterns including A-F hex digits.

Pin Name Type Function
1 DIN Input Serial data input (loads on CLK rising edge)
2,3,5,8,10,11 DIG 0,4,6,7,5,1 Output Digit drive lines (sink current from common cathode)
4,9 GND Ground Ground (both must be connected)
12 LOAD Input Load data (latches 16 bits on rising edge)
13 CLK Input Serial clock (max 10MHz)
14-17,20-23 SEG A-G,DP Output Segment drives (source current to display)
18 ISET Input Connect RSET to V+ to set peak segment current
19 V+ Power Positive supply (4.0-5.5V)
24 DOUT Output Serial data output (for daisy-chaining)
  • 7-segment LED display panels for industrial instruments and panel meters
  • Bar-graph display indicators for audio level and process status
  • LED matrix modules for scrolling text and graphic displays
  • Industrial controller and equipment status displays with daisy-chain capability
Manufacturer Part Number Package Notes
Analog Devices MAX7221CNG+ PDIP-24 SPI/QSPI compatible, lower EMI
Analog Devices MAX7219CWG+ SOIC-24W Wide SOIC surface-mount version
Analog Devices AS1106PL PDIP-24 Equivalent with open/short detection
TI TLC5926DBQR TSSOP-24 16-channel constant-current LED driver
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Tel / WhatsApp: +86 13760382860
Address: Room 2919, Guoli Building, Huaqiang North, Futian District, Shenzhen, Guangdong, China
 

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