MAX7219_10 Datasheet, PDF (1/17 Pages) Maxim Integrated Products – Serially Interfaced, 8-Digit LED Display Drivers

AVAILABLE
MAX7219/MAX7221
Serially Interfaced, 8-Digit LED Display Drivers
General Description
The MAX7219/MAX7221 are compact, serial input/out-
put common-cathode display drivers that interface
microprocessors (µPs) 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 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 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.
Applications
Bar-Graph Displays
Panel Meters
Industrial Controllers
LED Matrix Displays
Func^Ptⁱiⁿon^Ca^olⁿD^fii^ga^ug^rr^aa^tm^iosⁿ
Features
♦ 10MHz Serial Interface
♦ 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
for Lower EMI (MAX7221)
♦ SPI, QSPI, MICROWIRE Serial Interface (MAX7221)
♦ 24-Pin DIP and SO Packages
Ordering Information
PART
TEMP RANGE PIN-PACKAGE
MAX7219CNG 0°C to +70°C 24 Narrow Plastic DIP
MAX7219CWG 0°C to +70°C 24 Wide SO
MAX7219C/D
0°C to +70°C Dice*
MAX7219ENG -40°C to +85°C 24 Narrow Plastic DIP
MAX7219EWG -40°C to +85°C 24 Wide SO
MAX7219ERG -40°C to +85°C 24 Narrow CERDIP
Ordering Information continued at end of data sheet.
*Dice are specified at T_A = +25°C.
Typical Application Circuit
TOP VIEW
DIN 1
24 DOUT
DIG 0 2
23 SEG D
DIG 4 3
22 SEG DP
+5V
GND 4
DIG 6 5
DIG 2 6
DIG 3 7
DIG 7 8
GND 9
DIG 5 10
DIG 1 11
LOAD (CS) 12
MAX7219
MAX7221
21 SEG E
20 SEG C
19 V+
18 ISET
17 SEG G
16 SEG B
15 SEG F
14 SEG A
13 CLK
9.53kΩ
MOSI
μP I/O
SCK
19
V+
18
ISET
DIG 0–DIG 7
8 DIGITS
1
DIN
MAX7219
MAX7221
12 _{LOAD (CS)}
13 _CLK
9 _GND
SEG A–G,
SEG DP _{8 SEGMENTS}
GND
4
Pin Configurations appear at end of data sheet.
Functi⁽o⁾ n^Ma^AXl ⁷D²²ia¹ g^ONra^LYms continue^Dd^IPa^/t^Se^Ond of data sheet.
( ) MAX7221 ONLY
8-DIGIT μP DISPLAY
UCSP is a trademark of Maxim Integrated Products, Inc.
SPI and QSPI are trademarks of Motorola Inc. MICROWIRE is a trademark of National Semiconductor Corp.
For pricing, delivery, and ordering information, please contact Maxim Direct
at 1-888-629-4642, or visit Maxim’s website at www.maximintegrated.com.
19-4452; Rev 4; 7/03