Datasheet MAX7219, MAX7221 (Analog Devices)

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MAX7219/MAX7221 Serially Interfaced, 8-Digit LED Display Drivers General Description Features
The MAX7219/MAX7221 are compact, serial input/ ● 10MHz Serial Interface output common-cathode display drivers that interface ● Individual LED Segment Control microprocessors (μPs) to 7-segment numeric LED displays of up to 8 digits, bar-graph displays, or 64 individual ● Decode/No-Decode Digit Selection LEDs. Included on-chip are a BCD code-B decoder, ● 150μA Low-Power Shutdown (Data Retained) multiplex scan circuitry, segment and digit drivers, and ● Digital and Analog Brightness Control an 8x8 static RAM that stores each digit. Only one ● Display Blanked on Power-Up external resistor is required to set the segment current for all LEDs. The MAX7221 is compatible with SPI™, QSPI™, ● Drive Common-Cathode LED Display and MICROWIRE™, and has slew-rate-limited segment ● Slew-Rate Limited Segment Drivers drivers to reduce EMI. for Lower EMI (MAX7221) A convenient 4-wire serial interface connects to all ● SPI, QSPI, MICROWIRE Serial Interface (MAX7221) common μPs. Individual digits may be addressed ● 24-Pin DIP and SO Packages and updated without rewriting the entire display. The MAX7219/MAX7221 also allow the user to select code-B
Ordering Information
decoding or no-decode for each digit.
PART TEMP RANGE PIN-PACKAGE
The devices include a 150μA low-power shutdown mode,
MAX7219
CNG 0°C to +70°C 24 Narrow Plastic DIP analog and digital brightness control, a scan-limit register that allows the user to display from 1 to 8 digits, and a test MAX7219CWG 0°C to +70°C 24 Wide SO mode that forces all LEDs on. MAX7219C/D 0°C to +70°C Dice* For applications requiring 3V operation or segment blinking, MAX7219ENG -40°C to +85°C 24 Narrow Plastic DIP refer to the MAX6951 data sheet. MAX7219EWG -40°C to +85°C 24 Wide SO
Applications
MAX7219ERG -40°C to +85°C 24 Narrow CERDIP ● Bar-Graph Displays ● Panel Meters
Ordering Information continued at end of data sheet.
● Industrial Controllers ● LED Matrix Displays *Dice are specified at TA = +25°C.
Pin Configuration Typical Application Circuit
TOP VIEW
+
DIN 1 24 DOUT DIG 0 2 23 SEG D DIG 4 3 22 SEG DP +5V GND 4 21 SEG E 19 9.53kΩ DIG 6 5
MAX7219
20 SEG C V+
MAX7221
18 DIG 2 6 19 V+ ISET DIG 0–DIG 7 8 DIGITS DIG 3 7 18 ISET
MAX7219
MOSI 1 DIN
MAX7221
DIG 7 8 17 SEG G µP I/O 12 LOAD (CS) GND 9 16 SEG B SCK 13 SEG A–G, CLK DIG 5 10 15 SEG F 9 SEG DP 8 SEGMENTS GND DIG 1 11 14 SEG A GND 4 LOAD (CS) 12 13 CLK ( ) MAX7221 ONLY ( ) MAX7221 ONLY
DIP/SO 8-DIGIT µP DISPLAY
SPI and QSPI are trademarks of Motorola Inc. MICROWIRE is a trademark of National Semiconductor Corp. 19-4452; Rev 6; 8/21