Datasheet

ManualsBrandsMAXIM INTEGRATED ManualsPMICsPMIC - display driver LED 7 segments + DP 8 numbers Seriell, 4-wire 330 mA PDIP 24

Table Of Contents

Blank Page

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

DIN

μP

ISET

9.53kΩ

8 DIGITS

8 SEGMENTS

+5V

SEG A–G,

SEG DP

CLK

LOAD (CS)

GND

V+

GND

MAX7219

MAX7221

Typical Application Circuit

Pin Configuration

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

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

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

= +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

Summary of content (17 pages)

PAGE 1
MAX7219/MAX7221 LE AVAILAB Serially Interfaced, 8-Digit LED Display Drivers General Description The MAX7219/MAX7221 are compact, serial input/output common-cathode display drivers that interface microprocessors (µPs) to 7-segment numeric LED displays of up to 8 digits, bar-graph displays, or 64 individual 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.
PAGE 2
MAX7219/MAX7221 Serially Interfaced, 8-Digit LED Display Drivers ABSOLUTE MAXIMUM RATINGS Voltage (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 DIG 0–DIG 7 Sink Current..............................................500mA SEG A–G, DP Source Current.................................
PAGE 3
MAX7219/MAX7221 Serially Interfaced, 8-Digit LED Display Drivers ELECTRICAL CHARACTERISTICS (continued) (V+ = 5V ±10%, RSET = 9.53kΩ ±1%, TA = TMIN to TMAX, unless otherwise noted.) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS 1 µA LOGIC INPUTS Input Current DIN, CLK, LOAD, CS IIH, IIL Logic High Input Voltage VIH Logic Low Input Voltage VIL Output High Voltage VOH DOUT, ISOURCE = -1mA Output Low Voltage VOL DOUT, ISINK = 1.
PAGE 4
MAX7219/MAX7221 Serially Interfaced, 8-Digit LED Display Drivers __________________________________________Typical Operating Characteristics (V+ = +5V, TA = +25°C, unless otherwise noted.) SCAN FREQUENCY vs. POSITIVE SUPPLY VOLTAGE 60 OUTPUT CURRENT (mA) 810 800 790 780 770 760 MAX7219/21 02 820 SCAN FREQUENCY (Hz) 70 MAX7219/21 01 830 SEGMENT DRIVER OUTPUT CURRENT vs. OUTPUT VOLTAGE RSET = 10kΩ 50 40 RSET = 20kΩ 30 20 RSET = 40kΩ 750 10 740 0 4.4 4.8 5.2 6.
PAGE 5
MAX7219/MAX7221 Serially Interfaced, 8-Digit LED Display Drivers Pin Description PIN NAME 1 DIN 2, 3, 5–8, 10, 11 DIG 0–DIG 7 4, 9 GND 12 FUNCTION 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 the digit outputs to V+ when turned off. The MAX7221’s digit drivers are high-impedance when turned off.
PAGE 6
MAX7219/MAX7221 Serially Interfaced, 8-Digit LED Display Drivers CS OR LOAD tCSW tCSH tCL tCSS tCP tCH tLDCK CLK tDH tDS DIN D15 D14 D1 D0 tDO DOUT Figure 1. Timing Diagram Table 1.
PAGE 7
MAX7219/MAX7221 Serially Interfaced, 8-Digit LED Display Drivers Initial Power-Up Table 2. Register Address Map On initial power-up, all control registers are reset, the display is blanked, and the MAX7219/MAX7221 enter shutdown mode. Program the display driver prior to display use. Otherwise, it will initially be set to scan one digit, it will not decode data in the data registers, and the intensity register will be set to its minimum value.
PAGE 8
MAX7219/MAX7221 Serially Interfaced, 8-Digit LED Display Drivers Table 5.
PAGE 9
MAX7219/MAX7221 Serially Interfaced, 8-Digit LED Display Drivers Table 7.
PAGE 10
MAX7219/MAX7221 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 RSET resistor must be adjusted according to the number of digits displayed, to limit individual digit driver power dissipation. Table 9 lists the number of digits displayed and the corresponding maximum recommended segment current when the digit drivers are used.
PAGE 11
MAX7219/MAX7221 Serially Interfaced, 8-Digit LED Display Drivers Table 11. RSET vs. Segment Current and LED Forward Voltage ISEG (mA) 40 VLED (V) Table 12. Package Thermal Resistance Data PACKAGE THERMAL RESISTANCE θJA) (θ 1.5 2.0 2.5 3.0 3.5 12.2 11.8 11.0 10.6 9.69 24 Narrow DIP +75°C/W +85°C/W +80°C/W 30 17.8 17.1 15.8 15.0 14.0 24 Wide SO 20 29.8 28.0 25.9 24.5 22.6 24 CERDIP 51.2 Maximum Junction Temperature (TJ) = +150°C 10 66.7 63.7 59.3 55.
PAGE 12
MAX7219/MAX7221 Serially Interfaced, 8-Digit LED Display Drivers AND2307SLC 5 7 9 6 10 4 2 3 1N5524B 5.6V ±5% AND2307SLC 5 ANODE DP ANODE DP 7 ANODE A ANODE A 9 ANODE F ANODE F 6 ANODE B ANODE B 10 ANODE G ANODE G 4 2 ANODE C ANODE E ANODE C ANODE E 3 ANODE D CATHODE 8 ANODE D CATHODE 8 23 21 20 17 16 15 14 22 SEG D SEG E SEG C SEG G SEG B SEG F 5V MAX7219 MAX7221 V+ 19 4.7kΩ 0.1μF SEG A 30kΩ SEG DP 4 9 DATA IN LOAD (CS) CLOCK 1 12 13 18 GND GND DIG 0 LOAD (CS) DIG 1 4.
PAGE 13
MAX7219/MAX7221 Serially Interfaced, 8-Digit LED Display Drivers 8 DATA IN 8 8 DIN DOUT DIN DOUT DIG 0 SEG D DIG 0 SEG D DIG 4 SEG DP DIG 4 SEG DP GND SEG E DIG 6 SEG C DIG 2 V+ DIG 3 ISET 5V 0.1μF 9.53kΩ GND SEG E DIG 6 SEG C DIG 2 V+ DIG 3 ISET DIG 7 SEG G DIG 7 SEG G GND SEG B GND SEG B DIG 5 SEG F DIG 5 SEG F DIG 1 SEG A DIG 1 SEG A LOAD (CS) ( ) MAX7221 ONLY 8 CLK MAX7219 MAX7221 LOAD (CS) CLK 5V 0.1μF 9.
PAGE 14
MAX7219/MAX7221 Serially Interfaced, 8-Digit LED Display Drivers Ordering Information (continued) PART TEMP RANGE MAX7221CNG 0°C to +70°C 24 Narrow Plastic DIP MAX7221CWG MAX7221C/D MAX7221ENG 0°C to +70°C 0°C to +70°C -40°C to +85°C 24 Wide SO Dice* 24 Narrow Plastic DIP MAX7221EWG MAX7221ERG -40°C to +85°C -40°C to +85°C 24 Wide SO 24 Narrow CERDIP *Dice are specified at TA = +25°C.
PAGE 15
MAX7219/MAX7221 Serially Interfaced, 8-Digit LED Display Drivers Package Information INCHES N E DIM A A1 B C e E H L H MAX MIN 0.093 0.104 0.004 0.012 0.014 0.019 0.009 0.013 0.050 0.291 0.299 0.394 0.419 0.050 0.016 SOICW.EPS (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.) MILLIMETERS MIN 2.35 0.10 0.35 0.23 MAX 2.65 0.30 0.49 0.32 1.27 7.40 7.60 10.00 10.65 0.40 1.
PAGE 16
MAX7219/MAX7221 Serially Interfaced, 8-Digit LED Display Drivers Package Information (continued) PDIPN.EPS (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.
PAGE 17
MAX7219/MAX7221 Serially Interfaced, 8-Digit LED Display Drivers 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. The parametric values (min and max limits) shown in the Electrical Characteristics table are guaranteed. Other parametric values quoted in this data sheet are provided for guidance.