Product Summary
The MAX7221CNG is a compact, serial input/output common-cathode display driver that interfaces 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 MAX7221CNG is compatible with SPI, QSPI, and Microwire, and has slew-ratelimited segment drivers to reduce EMI. A convenient 3-wire serial interface connects to all common μPs. Individual digits may be addressed and updated without rewriting the entire display. The MAX7221CNG also allows the user to select code-B decoding or no-decode for each digit. The MAX7221CNG includes a 150μA low-power shutdown mode, analog and digital brightness control, a scanlimit register that allows the user to display from 1 to 8 digits, and a test mode that forces all LEDs on.
Parametrics
MAX7221CNG absolute maximum ratings: (1)Voltage (with respect to GND): V+: -0.3V to 6V; DIN, CLK, LOAD, CS: -0.3V to 6V; All Other Pins: -0.3V to (V+ + 0.3V); (2)Current: DIG0–DIG7 Sink Current: 500mA; SEGA–G, DP Source Current: 100mA; (3)Continuous Power Dissipation (TA = +85℃): Narrow Plastic DIP: 0.87W; Wide SO: 0.76W; Narrow CERDIP: 1.1W; (4)Storage Temperature Range: -65℃ to +160℃; (5)Lead Temperature (soldering, 10sec): +300℃.
Features
MAX7221CNG features: (1)10MHz Serial Interface; (2)Individual LED Segment Control; (3)Decode/No-Decode Digit Selection; (4)150μA Low-Power Shutdown (Data Retained); (5)Digital and Analog Brightness Control; (6)Display Blanked on Power-Up; (7)Drive Common-Cathode LED Display; (8)Slew-Rate Limited Segment Drivers for Lower EMI (MAX7221); (9)SPI, QSPI, Microwire Serial Interface (MAX7221); (10)24-Pin DIP and SO Packages.
Diagrams
Image | Part No | Mfg | Description | Pricing (USD) |
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MAX7221CNG |
Maxim Integrated Products |
LED Display Drivers 8-Digit LED Display Driver |
Data Sheet |
Negotiable |
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MAX7221CNG+ |
Maxim Integrated Products |
LED Display Drivers 8-Digit LED Display Driver |
Data Sheet |
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