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MAX7221ENG
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MAX7221ENG数据手册
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AVAILABLE
Functional Diagrams
Pin Configurations appear at end of data sheet.
Functional Diagrams continued at end of data sheet.
UCSP is a trademark of Maxim Integrated Products, Inc.
For pricing, delivery, and
ordering information, please contact Maxim Direct
at 1-888-629-4642, or visit Maxim’s website at www.maximintegrated.com.
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
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
Serially Interfaced, 8-Digit LED Display Drivers
( ) MAX7221 ONLY
8-DIGIT μP DISPLAY
DIG 0–DIG 7
MOSI
I/O
SCK
18
1
12
13
9
4
DIN
μP
ISET
9.53kΩ
8 DIGITS
8 SEGMENTS
+5V
19
SEG A–G,
SEG DP
CLK
LOAD (CS)
GND
V+
GND
MAX7219
MAX7221
Typical 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; Rev 4; 7/03
PART
MAX7219CNG
MAX7219CWG
MAX7219C/D 0°C to +70°C
0°C to +70°C
0°C to +70°C
TEMP RANGE PIN-PACKAGE
24 Narrow Plastic DIP
24 Wide SO
Dice*
Ordering Information
Ordering Information continued at end of data sheet.
*Dice are specified at T
A
= +25°C.
MAX7219ENG
MAX7219EWG
MAX7219ERG -40°C to +85°C
-40°C to +85°C
-40°C to +85°C 24 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.
Bar-Graph Displays
Industrial Controllers
Panel Meters
LED Matrix Displays
MAX7219/MAX7221

MAX7221ENG 数据手册

Maxim Integrated(美信)
17 页 / 0.47 MByte
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