MAX7221EWG Maxim Integrated Products, MAX7221EWG Datasheet

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MAX7221EWG

Manufacturer Part Number
MAX7221EWG
Description
LED Drivers
Manufacturer
Maxim Integrated Products
Datasheet

Specifications of MAX7221EWG

Number Of Digits
8
Number Of Segments
64
Low Level Output Current
320 mA
High Level Output Current
- 45 mA
Operating Supply Voltage
4 V to 5.5 V
Maximum Supply Current
330 mA
Maximum Power Dissipation
941 mW
Maximum Operating Temperature
+ 85 C
Mounting Style
SMD/SMT
Package / Case
SOIC-24 Wide
Minimum Operating Temperature
- 40 C
Lead Free Status / RoHS Status
Lead free / RoHS Compliant

Available stocks

Company
Part Number
Manufacturer
Quantity
Price
Part Number:
MAX7221EWG
Manufacturer:
MAXIM/美信
Quantity:
20 000
Part Number:
MAX7221EWG+T
Manufacturer:
MAXIM
Quantity:
3 000
Part Number:
MAX7221EWG+T
Manufacturer:
MAXIM
Quantity:
10 402
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.
19-4452; Rev 4; 7/03
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/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
Bar-Graph Displays
Industrial Controllers
Serially Interfaced, 8-Digit LED Display Drivers
TOP VIEW
( ) MAX7221 ONLY
LOAD (CS)
DIG 0
DIG 4
DIG 6
DIG 2
DIG 3
DIG 7
DIG 5
DIG 1
GND
GND
DIN
________________________________________________________________ Maxim Integrated Products
10
11
12
1
2
3
4
5
6
7
8
9
General Description
MAX7219
MAX7221
DIP/SO
Pin Configuration
Panel Meters
LED Matrix Displays
Applications
24
23
22
21
20
19
18
17
16
15
14
13
DOUT
SEG D
SEG DP
SEG E
SEG C
V+
ISET
SEG G
SEG B
SEG F
SEG A
CLK
♦ ♦ 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
♦ ♦ SPI, QSPI, MICROWIRE Serial Interface (MAX7221)
♦ ♦ 24-Pin DIP and SO Packages
Ordering Information continued at end of data sheet.
*Dice are specified at T
MAX7219CNG
MAX7219CWG
MAX7219C/D
MAX7219ENG
MAX7219EWG
MAX7219ERG
for Lower EMI (MAX7221)
( ) MAX7221 ONLY
PART
μP
MOSI
SCK
9.53kΩ
I/O
Typical Application Circuit
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
TEMP RANGE
0°C to +70°C
0°C to +70°C
0°C to +70°C
18
12
13
A
1
9
= +25°C.
Ordering Information
ISET
DIN
LOAD (CS)
CLK
GND
8-DIGIT μP DISPLAY
MAX7219
MAX7221
GND
V+
+5V
19
DIG 0–DIG 7
4
SEG A–G,
SEG DP
24 Narrow Plastic DIP
24 Wide SO
Dice*
24 Narrow Plastic DIP
24 Wide SO
24 Narrow CERDIP
PIN-PACKAGE
8 SEGMENTS
8 DIGITS
Features
1

Related parts for MAX7221EWG

MAX7221EWG Summary of contents

Page 1

... MAX7221 ONLY DIP/SO SPI and QSPI are trademarks of Motorola Inc. MICROWIRE is a trademark of National Semiconductor Corp. ________________________________________________________________ Maxim Integrated Products For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com. ♦ ♦ 10MHz Serial Interface ♦ ...

Page 2

Serially Interfaced, 8-Digit LED Display Drivers ABSOLUTE MAXIMUM RATINGS Voltage (with respect to GND) V+ ............................................................................-0. DIN, CLK, LOAD, CS ...............................................-0. All Other Pins.............................................-0.3V to (V+ + 0.3V) Current DIG 0–DIG 7 Sink Current..............................................500mA SEG A–G, ...

Page 3

Serially Interfaced, 8-Digit LED Display Drivers ELECTRICAL CHARACTERISTICS (continued) ( ±10 9.53kΩ ±1%, T SET A PARAMETER SYMBOL LOGIC INPUTS Input Current DIN, CLK LOAD, CS Logic High Input Voltage V Logic Low Input ...

Page 4

Serially Interfaced, 8-Digit LED Display Drivers __________________________________________Typical Operating Characteristics (V+ = +5V +25°C, unless otherwise noted.) A SCAN FREQUENCY vs. POSITIVE SUPPLY VOLTAGE 830 820 810 800 790 780 770 760 750 740 730 4.0 4.4 4.8 POSITIVE ...

Page 5

Serially Interfaced, 8-Digit LED Display Drivers PIN NAME 1 DIN Serial-Data Input. Data is loaded into the internal 16-bit shift register on CLK’s rising edge. Eight-Digit Drive Lines that sink current from the display common cathode. The MAX7219 pulls 2, ...

Page 6

Serially Interfaced, 8-Digit LED Display Drivers CS OR LOAD t CSS CLK t DIN DOUT Figure 1. Timing Diagram Table 1. Serial-Data Format (16 Bits) D15 D14 D13 D12 D11 Detailed Description MAX7219/MAX7221 Differences The MAX7219 ...

Page 7

Serially Interfaced, 8-Digit LED Display Drivers Table 2. Register Address Map ADDRESS REGISTER D15– D11 D10 D12 No- Digit Digit Digit Digit ...

Page 8

Serially Interfaced, 8-Digit LED Display Drivers Table 5. Code B Font REGISTER DATA 7-SEGMENT CHARACTER D7* D6– ...

Page 9

Serially Interfaced, 8-Digit LED Display Drivers Table 7. Intensity Register Format (Address (Hex) = 0xXA) DUTY CYCLE D7 MAX7219 MAX7221 1/32 1/16 X (min on) (min on) 3/32 2/16 X 5/32 3/16 X 7/32 4/16 X 9/32 5/16 X 11/32 ...

Page 10

Serially Interfaced, 8-Digit LED Display Drivers If the scan-limit register is set for three digits or less, individual digit drivers will dissipate excessive amounts of power. Consequently, the value of the R must be adjusted according to the number of ...

Page 11

Serially Interfaced, 8-Digit LED Display Drivers Table 11. R vs. Segment Current and SET LED Forward Voltage V LED I (mA) SEG 1.5 2.0 2.5 40 12.2 11.8 11.0 30 17.8 17.1 15.8 20 29.8 28.0 25.9 10 66.7 63.7 ...

Page 12

Serially Interfaced, 8-Digit LED Display Drivers 1N5524B 5.6V ± DATA IN 12 LOAD (CS) 13 CLOCK *4.7kΩ PULLUP REQUIRED FOR MAX7221 ( ) MAX7221 ONLY Figure 2. MAX7219/MAX7221 Driving 2.3in Displays 12 ...

Page 13

Serially Interfaced, 8-Digit LED Display Drivers 8 DIN DATA IN DIG 0 DIG 4 GND DIG 6 DIG 2 DIG 3 DIG 7 GND DIG 5 DIG 1 LOAD (CS) LOAD DATA ( ) MAX7221 ONLY CLOCK Figure 3. Cascading ...

Page 14

... Serially Interfaced, 8-Digit LED Display Drivers Ordering Information (continued) PART TEMP RANGE MAX7221CNG 0°C to +70°C MAX7221CWG 0°C to +70°C MAX7221C/D 0°C to +70°C MAX7221ENG -40°C to +85°C MAX7221EWG -40°C to +85°C MAX7221ERG -40°C to +85°C *Dice are specified +25° ______________________________________________________________________________________ PIN-PACKAGE 24 Narrow Plastic DIP GND ...

Page 15

Serially Interfaced, 8-Digit LED Display Drivers (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information go to www.maxim-ic.com/packages TOP VIEW FRONT VIEW ______________________________________________________________________________________ ...

Page 16

... Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. 16 __________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 (408) 737-7600 © 2003 Maxim Integrated Products ...

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