MAX7221：Serially Interfaced, 8-Digit, LED Display Drivers
The MAX7219/MAX7221 are compact, serial input/output common-cathode display drivers that interface microprocessors (µPs) 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 8x8 static RAM that stores each digit. Only one external resistor is required to set the segment current for all LEDs. The MAX7221 is compatible with SPI™, QSPI™, and MICROWIRE™, and has slew-rate-limited segment drivers to reduce EMI. A convenient 4-wire serial interface connects to all common µPs. Individual digits may be addressed and updated without rewriting the entire display. The MAX7219/MAX7221 also allow the user to select code-B decoding or no-decode for each digit. The devices include a 150µA low-power shutdown mode, analog and digital brightness control, a scan-limit register that allows the user to display from 1 to 8 digits, and a test mode that forces all LEDs on. For applications requiring 3V operation or segment blinking, refer to the MAX6951 data sheet.
Key Features
| MAX7219, MAX7221: Typical Application Circuit Applications/Uses
|
DataSheet
| title | Download file |
|---|---|
| MAX7219-MAX7221 Data Sheet | MAX7219-MAX7221.pdf |
Parametrics
| Part Number | LCD or LED | Digits or Char. | Output Format | Display Type | Interface | Fonts | VSUPPLY (V) | VSUPPLY (V) | Package/Pins | Budgetary Price |
|---|---|---|---|---|---|---|---|---|---|---|
| min | max | See Notes | ||||||||
| MAX7219 | LED | 8-Digit | 7 segment + DP | Common Cathode | Serial 3-Wire 10Mbit | Code B | 4 | 5.5 | CDIP(N)/24 PDIP(N)/24 SOIC(W)/24 | $5.38 @1k |
| MAX7221 | Serial SPI 10Mbit | CDIP(N)/24 PDIP(N)/24 SOIC(W)/24 | $5.54 @1k | |||||||
Quality and Environmental Data
Related Products
- MAX6958：2-Wire Interfaced, 3V to 5.5V, 4-Digit, 9-Segment LED Display Drivers with Keyscan
- MAX6959：2-Wire Interfaced, 3V to 5.5V, 4-Digit, 9-Segment LED Display Drivers with Keyscan
- MAX6955：2-Wire Interfaced, 2.7V to 5.5V LED Display Driver with I/O Expander and Key Scan
- MAX6956：2-Wire-Interfaced, 2.5V to 5.5V, 20-Port or 28-Port LED Display Driver and I/O Expander
- MAX6954：4-Wire Interfaced, 2.7V to 5.5V LED Display Driver with I/O Expander and Key Scan
- MAX6952：4-Wire Interfaced, 2.7V to 5.5V, 4-Digit 5 x 7 Matrix LED Display Driver
- MAX6957：4-Wire-Interfaced, 2.5V to 5.5V, 20-Port and 28-Port LED Display Driver and I/O Expander
- MAX6953：2-Wire Interfaced, 2.7V to 5.5V, 4-Digit 5 x 7 Matrix LED Display Driver
- MAX6950：Serially Interfaced, +2.7V to +5.5V, 5- and 8-Digit LED Display Drivers
- MAX6951：Serially Interfaced, +2.7V to +5.5V, 5- and 8-Digit LED Display Drivers
Ordering Information
| Part Number | Status | Recommended Replacement | Package | Temp | RoHS |
|---|---|---|---|---|---|
| MAX7221CNG | No Longer Available | MAX7221CNG+ | PDIP(N),;24 pin;158.4 mm² | 0°C to +70°C | No |
| MAX7221CNG+ | Active | PDIP(N),;24 pin;158.4 mm² | 0°C to +70°C | Lead Free | |
| MAX7221CWG | No Longer Available | MAX7221CWG+ | SOIC(W),;24 pin;166.1 mm² | 0°C to +70°C | No |
| MAX7221CWG+ | Active | SOIC(W),;24 pin;166.1 mm² | 0°C to +70°C | Lead Free | |
| MAX7221CWG+T | Active | SOIC(W),;24 pin;166.1 mm² | 0°C to +70°C | Lead Free | |
| MAX7221CWG-T | No Longer Available | MAX7221CWG+T | W.SO;24 pin | 0°C to +70°C | See data sheet |
| MAX7221ENG | No Longer Available | MAX7221ENG+ | PDIP(N),;24 pin;158.4 mm² | -40°C to +85°C | No |
| MAX7221ENG+ | Active | PDIP(N),;24 pin;158.4 mm² | -40°C to +85°C | Lead Free | |
| MAX7221ERG | No Longer Available | CDIP(N),;24 pin;264.3 mm² | -40°C to +85°C | No | |
| MAX7221EWG | No Longer Available | MAX7221EWG+ | SOIC(W),;24 pin;166.1 mm² | -40°C to +85°C | No |
| Part Number | Status | Recommended Replacement | Package | Temp | RoHS |
| MAX7221EWG+ | Active | SOIC(W),;24 pin;166.1 mm² | -40°C to +85°C | Lead Free | |
| MAX7221EWG+T | Active | SOIC(W),;24 pin;166.1 mm² | -40°C to +85°C | Lead Free | |
| MAX7221EWG-T | No Longer Available | MAX7221EWG+T | W.SO;24 pin | -40°C to +85°C | See data sheet |
- MAX7219-MAX7221.pdf MAX7221
- MAX7219-MAX7221_cn.pdf MAX7221
- One-Wire Network Controls Remote SPI Peripherals DS2413
- Using a PC to Experiment with the MAX7219 and MAX7221 LED Display Drivers MAX7221
- LEDs Are Still Popular (and Improving) after All These Years MAX6966
- Using Maxim SPI-compatible Display Drivers with other SPI Peripherals MAX7317
- Using the MAX7219/7221 to Drive Higher Voltage or Current MAX7221
- Electronic Displays Comparison MAX6966
- Multiplexing Shutdown Allows Text to be Displayed MAX7221
- 12-Bit Thermometer Using an 8-Bit µC and Assembler MAX7221
- Migrating from the MAX7219 and MAX7221 to the MAX6950 and MAX6951 LED Drivers MAX7221
- Data Multiplexer Adds Cursor To MAX7219 or MAX7221 LED 7 Segment Display Driver MAX7221
- MAX7221.pdf MAX7221
