Image MAX7219
型号: MAX7219
厂商: Maxim Integrated Maxim Integrated
分类: 集成电路
描述: serially interfaced, 8-digit led display drivers
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19-4452; Rev 3; 7/97  
S e ria lly In t e rfa c e d , 8 -Dig it LED Dis p la y Drive rs  
9/MAX721  
_______________Ge n e ra l De s c rip t io n  
____________________________Fe a t u re s  
10MHz Serial Interface  
The MAX7219/MAX7221 are compact, serial input/out-  
p ut c ommon-c a thod e d is p la y d rive rs tha t inte rfa c e  
microprocessors (µPs) to 7-segment numeric LED dis-  
plays of up to 8 digits, bar-graph displays, or 64 indi-  
vid ua l LEDs . Inc lud e d on-c hip a re a BCD c od e -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 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.  
Individual LED Segment Control  
Decode/No-Decode Digit Selection  
150µA Low-Power Shutdown (Data Retained)  
Digital and Analog Brightness Control  
Display Blanked on Power-Up  
Drive Common-Cathode LED Display  
Slew-Rate Limited Segment Drivers  
A convenient 3-wire serial interface connects to all  
common µPs. Individual digits may be addressed and  
up d a te d without re writing the e ntire d is p la y. The  
MAX7219/MAX7221 also allow the user to select code-  
B decoding or no-decode for each digit.  
for Lower EMI (MAX7221)  
SPI, QSPI, Microwire Serial Interface (MAX7221)  
24-Pin DIP and SO Packages  
The d e vic e s inc lud e a 150µA low-p owe r s hutd own  
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.  
______________Ord e rin g In fo rm a t io n  
PART  
TEMP. RANGE  
0°C to +70°C  
0°C to +70°C  
0°C to +70°C  
-40°C to +85°C  
-40°C to +85°C  
-40°C to +85°C  
PIN-PACKAGE  
24 Narrow Plastic DIP  
24 Wide SO  
MAX7219CNG  
MAX7219CWG  
MAX7219C/D  
MAX7219ENG  
MAX7219EWG  
MAX7219ERG  
________________________Ap p lic a t io n s  
Bar-Graph Displays  
Dice*  
24 Narrow Plastic DIP  
24 Wide SO  
7-Segment Displays  
Industrial Controllers  
24 Narrow CERDIP  
Panel Meters  
Ordering Information continued at end of data sheet.  
*Dice are specified at T = +25°C.  
A
LED Matrix Displays  
__________________P in Co n fig u ra t io n  
________Typ ic a l Ap p lic a t io n Circ u it  
TOP VIEW  
DIN  
DIG 0  
DIG 4  
GND  
1
2
3
4
5
6
7
8
9
24 DOUT  
23 SEG D  
22 SEG DP  
21 SEG E  
20 SEG C  
19 V+  
+5V  
19  
9.53k  
V+  
MAX7219  
MAX7221  
DIG 6  
DIG 2  
DIG 3  
DIG 7  
GND  
18  
DIG 0DIG 7  
I
SET  
8 DIGITS  
MAX7219  
MAX7221  
1
18 ISET  
MOSI  
DIN  
17 SEG G  
16 SEG B  
15 SEG F  
14 SEG A  
12  
µP  
I/O  
LOAD (CS)  
13  
9
SEG AG,  
SEG DP  
SCK  
CLK  
GND  
DIG 5 10  
DIG 1 11  
8 SEGMENTS  
GND  
4
LOAD (CS) 12  
13  
CLK  
( ) MAX7221 ONLY  
8-DIGIT µP DISPLAY  
( ) MAX7221 ONLY  
DIP/SO  
SPI and QSPI are trademarks of Motorola Inc. Microwire is a trademark of National Semiconductor Corp.  
________________________________________________________________ Maxim Integrated Products  
1
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.  
For small orders, phone 408-737-7600 ext. 3468.