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1、_General Description The MAX7219/MAX7221 are compact, serial input/out- put common-cathode display drivers that interface microprocessors (Ps) to 7-segment numeric LED dis- plays of up to 8 digits, bar-graph displays, or 64 indi- vidual LEDs. Included on-chip are a BCD code-B decoder, multiplex scan
2、 circuitry, segment and digit drivers, and an 8x8 static RAM that stores each digit. Only one external resistor is required to set the seg- ment 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 3-wir
3、e serial interface connects to all common Ps. 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 150A low-power shutdown mode, analog and digital br
4、ightness 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. _Applications Bar-Graph Displays 7-Segment Displays Industrial Controllers Panel Meters LED Matrix Displays _Features o 10MHz Serial Interface o Individual LED Segmen
5、t Control o Decode/No-Decode Digit Selection o 150A Low-Power Shutdown (Data Retained) o Digital and Analog Brightness Control o Display Blanked on Power-Up o Drive Common-Cathode LED Display o Slew-Rate Limited Segment Drivers for Lower EMI (MAX7221) o SPI, QSPI, Microwire Serial Interface (MAX7221
6、) o 24-Pin DIP and SO Packages MAX7219/MAX7221 Serially Interfaced, 8-Digit LED Display Drivers _Maxim Integrated Products1 ( ) MAX7221 ONLY8-DIGIT P DISPLAY DIG 0DIG 7 MOSI I/O SCK 18 1 12 13 9 4 DIN P ISET 9.53k 8 DIGITS 8 SEGMENTS +5V 19 SEG AG, SEG DP CLK LOAD (CS) GND V+ GND MAX7219 MAX7221 _Ty
7、pical Application Circuit_Pin Configuration 24 23 22 21 20 19 18 17 1 2 3 4 5 6 7 8 DOUT SEG D SEG DP SEG EGND DIG 4 DIG 0 DIN TOP VIEW SEG C V+ ISET SEG GDIG 7 DIG 3 DIG 2 DIG 6 16 15 14 13 9 10 11 12 SEG B SEG F SEG A CLK ( ) MAX7221 ONLY LOAD (CS) DIG 1 DIG 5 GND DIP/SO MAX7219 MAX7221 19-4452; R
8、ev 3; 7/97 PART MAX7219CNG MAX7219CWG MAX7219C/D0C to +70C 0C to +70C 0C to +70C TEMP. RANGEPIN-PACKAGE 24 Narrow Plastic DIP 24 Wide SO Dice* _Ordering Information Ordering Information continued at end of data sheet. *Dice are specified at TA = +25C. MAX7219ENG MAX7219EWG MAX7219ERG-40C to +85C -40
9、C to +85C -40C to +85C24 Narrow Plastic DIP 24 Wide SO 24 Narrow CERDIP SPI and QSPI are trademarks of Motorola Inc. Microwire is a trademark of National Semiconductor Corp. For free samples & the latest literature: http:/www.maxim- , or phone 1-800-998-8800. For small orders, phone 408-737-7600 ext
10、. 3468. MAX7219/MAX7221 Serially Interfaced, 8-Digit LED Display Drivers 2_ ABSOLUTE MAXIMUM RATINGS ELECTRICAL CHARACTERISTICS (V+ = 5V 10%, RSET = 9.53k 1%, TA= TMINto TMAX, unless otherwise noted.) Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the dev
11、ice. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. Volt
12、age (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) Current DIG0DIG7 Sink Current500mA SEGAG, DP Source Current.100mA Continuous Power Dissipation (TA= +85C) Narrow Plastic DIP 0.87W Wide SO0.76W Narrow CERDIP.1.1W Operating Temperature Ranges
13、MAX7219C_G/MAX7221C_G 0C to +70C MAX7219E_G/MAX7221E_G-40C to +85C Storage Temperature Range.-65C to +160C Lead Temperature (soldering, 10sec).+300C RSET= open circuit All digital inputs at V+ or GND, TA= +25C Digit off, VDIGIT= V+ TA= +25C, V+ = 5V, VOUT= (V+ - 1V) All segments and decimal point on
14、, ISEG_= -40mA 8 digits scanned V+ = 5V, VOUT= 0.65V TA= +25C, V+ = 5V, VOUT= (V+ - 1V) CONDITIONS 8 Operating Supply Current A150I+ V4.05.5V+Operating Supply Voltage Shutdown Supply Current A-10IDIGIT Digit Drive Leakage (MAX7221 only) %3.0ISEGSegment Drive Current Matching mA/s102050ISEG/t Segment
15、 Current Slew Rate (MAX7221 only) mA 330 I+ Hz5008001300fOSCDisplay Scan Rate mA320IDIGITDigit Drive Sink Current mA-30-40-45ISEGSegment Drive Source Current UNITSMINTYPMAXSYMBOLPARAMETER Segment off, VSEG= 0VA1ISEG Segment Drive Leakage (MAX7221 only) Digit off, VDIGIT= (V+ - 0.3V)mA-2IDIGIT Digit Drive Source Current (MAX7219 only) Segment off, VSEG= 0.3VmA5ISEG Segment Drive Sink Current (MAX7219 only) MAX7219/MAX7221 Serially Interfaced, 8-Digit LED Display Drivers _
