Data Sheet
Contents
1. 1 30 2 GND 29 3 28 4 GND 27 5 26 6 25 7 5 24 8 23 9 5 22 o 10 lt 21 11 20 12 19 13 010 18 14 011 17 15 012 16 7219 8x8 DOT MATRIX 17 9 15 14 21 8 23 12 20 1 16 7 14 2 22 5 ROW PIN CONFIG 11 DIG 1 12 LOAD 1 DIN 24 2 DIGO SEG D 23 3 DIG 4 SEG DP 22 4 GND SEG 21 5 DIG2 SEG C 20 6 DIG 2 V 19 7 DIG3 ISET 18 8 DIG7 SEG G 17 9 GND SEG 16 10 DIG 5 SEG 15 SEG A 14 CLK 13 MAX 7219 8 x8 DOT MATRIX gt 4 4 COLUMN 4 4 rduino Nano v3 0 DB 2 E E 4 Copyright 2009 under the Creative Commons Attribution Share Alike 2 5 License http creativecommons org license bu sa 2 5 5U 5U 5U 5U to x 8 a 50 5 B 5U rduino c2 U CV c OTN Sha N cL Es o o RESET PC6CRESET UCC1 RESET Y1 UCC2 PB6CXTAL1 AUCC aS i 0560 i PBZ XTAL2 PD RXD OSCI 16MH PD4 lt TXD gt AW RX NC2 9 so gt AREF PD2CINDB CBUSB PD3CINT1 CBUS1 61 PCBKADCB PD4CTB CBUS2 PC1CADC12. MAAAXIMM 300 1 AA AL PACKAGE FAMILY OUTLINE PDIP 300 21 0043 D Name 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 Printed USA MAXIM is a registered trademark of Maxim Integrated Products LCcZXVM 6Lc0ZXVM P SPECIFCATION X P RS CUSTOMER S INFORMATION LED PRODUCTION NAME LD788BS SS22 MA PRODCTION TYPE MODEL NO TYPE 788 PART NO 2010 10 25 DATE ISSUEDER APPROVED BY RESULT PLEASE RETURN BY ONE COPY PARTNO LD788BS SS22 Description Emitted Color 45 LensColo APT Size 20 00 20 00 5 90 Absolute Maximum Ratings Symbol Maximum Rating Parameter Power Dissipation Pd Peak Forward Current Continuous Forward Current Forward Current Revers
3. 18 AREF Input reference 19 26 0 7 Input Analog input channel 0 to 7 27 5V Output or 5V output from on board regulator or Input 5V input from external power supply 30 VIN PWR Supply voltage Arduino Nano Mechanical Drawing 0000000000 RSTRXOTX1 1 70 5 04 D ya D Jameco Part Number 312160 19 4452 4 7 03 AVLAZXLAMI 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 uPs 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 HPs 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 1501 low power shutdown mode analog and digital brightness control a scan limit register that allows the user to display from 1 to 8 digi
4. OxXB SCAN LIMIT REGISTER DATA HEX D7 D6 D5 04 D3 D2 D1 DO CODE Display digit O only X X X X X 0 0 0 0 0 Display digits O amp 1 X X X X X 0 0 1 OxX1 Display digits O 1 2 X X X X X 0 1 0 OxX2 Display digits 0 123 X X X X X 0 1 1 0 3 Display digits 0 1234 X X X X X 1 0 0 OxX4 Display digits O 12345 X X X X X 1 0 OxX5 Display digits 0123456 X X X X X 1 1 0 Display digits 01234567 X X X X X 1 1 OxX7 See Scan Limit Register section for application Scan Limit Register scanned Since the number of scanned digits affects The scan limit register sets how many digits are dis the display brightness the scan limit register should played from 1 to 8 They are displayed in a multiplexed not be used to blank portions of the display such as manner with a typical display scan rate of 800Hz with 8 leading zero suppression Table 8 lists the scan limit digits displayed If fewer digits are displayed the scan register format rate is 8fosc N where is the number of digits AVLAZCLAVI 9 LCcZXVMW 6Lc0ZXVM 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 dis played to limit individual digit dri
5. N number of segments driven worst case is 8 VLED LED forward voltage ISEG segment current set by RSET Dissipation Example ISEG 40mA N 8 DUTY 31 32 VLED 1 8V 40mA 5 25V PD 5 25V 8mA 5 25V 1 8V 31 32 x 40mA x 8 2 1 11W Thus for a CERDIP package 0JA 80 C W from Table 12 the maximum allowed ambient temperature TA is given by TJ MAX x OJA 150 C TA 1 11W x 80 C W where TA 61 2 C The TA limits for PDIP and SO Packages in the dissipation example above are 66 7 C and 55 6 C respectively MAXIM Table 12 Package Thermal Resistance Data PACKAGE THERMAL RESISTANCE 24 Narrow DIP 1756W 24 Wide SO O 24 CERDIP Maximum Junction Temperature TJ 150 C Maximum Ambient Temperature TA 85 C Cascading Drivers The example in Figure 3 drives 16 digits using a 3 wire interface If the number of digits is not a multiple of 8 set both drivers scan limits registers to the same number so one display will not appear brighter than the other For example if 12 digits are need use 6 digits per display with both scan limit registers set for 6 digits so that both displays have a 1 6 duty cycle per digit If 11 digits are needed set both scan limit registers for 6 digits and leave one digit driver unconnected If one display for 6 digits and the other for 5 digits the sec ond display will appear b
6. 15 16 MAX7219 21 04 10mA div 10mA div 5us div 5us div 4 MAKIM Serially Interfaced 8 Digit LED Display Drivers Pin Description PIN NAME FUNCTION 1 DIN Serial Data Input Data is loaded into the internal 16 bit shift register on CLK s rising edge 2358 Eight Digit Drive Lines that sink current from the display common cathode The MAX7219 pulls 40 11 DIG 0 DIG 7 the digit outputs to V when turned off The MAX7221 s digit drivers are high impedance when turned off 4 9 GND Ground both GND pins must be connected LOAD Load Data Input The last 16 bits of serial data are latched on LOAD s rising edge MAX7219 5 Chip Select Input Serial data is loaded into the shift register while CS is low The last 16 bits of MAX7221 serial data are latched on CS s rising edge Serial Clock Input 10MHz maximum rate On CLK s rising edge data is shifted into the inter 13 CLK nal shift register On CLK s falling edge data is clocked out of DOUT On the MAX7221 the CLK input is active only while CS is low 14 17 SEG A SEG G Seven Segment Drives and Decimal Point Drive that source current to the display On the 4 7219 when segment driver is turned off it is pulled to GND The MAX7221 segment dri 20 23 DP A vers are high impedance when turned off Connect to Vpp through a resistor RSET to set the peak segment current Refer to Se
7. 4 o 9 9 9 1 1 1 0 0 Code decode for digits 7 0 1 1 1 1 1 1 1 1 OxFF 7 AZZLXVWV6LZZLXVIW MAX7219 MAX7221 Serially Interfaced 8 Digit LED Display Drivers Table 5 Code B Font REGISTER DATA ON SEGMENTS 1 7 SEGMENT CHARACTER D7 D6 D4 D3 D2 D1 00 DP A B D E F G 0 X 0 0 0 0 1 1 1 1 1 0 1 X 0 0 0 1 0 1 1 0 0 0 0 2 X 0 0 1 0 1 1 0 1 1 0 1 3 X 0 0 1 1 1 1 1 0 0 1 4 X 0 1 0 0 0 1 1 0 0 1 1 5 X 0 1 0 1 1 0 1 1 0 1 1 6 X 0 1 1 0 1 0 1 1 1 1 7 X 0 1 1 1 1 1 1 0 0 0 0 8 X 1 0 0 0 1 1 1 1 1 1 9 X 0 0 1 1 1 1 0 1 1 X 0 1 0 0 0 0 0 0 0 1 E X 0 1 1 1 0 0 1 1 1 1 H X 1 0 0 0 1 1 0 1 1 1 L X 1 0 1 0 0 0 1 1 1 0 P X 1 1 0 1 1 0 0 1 1 1 X 1 1 1 0 0 0 0 0 0 0 The decimal point is set by bit D7 1 Table 6 No Decode Mode Data Bits and Corresponding Segment Lines STANDARD 7 SEGMENT LED REGISTER DATA D7 D6 05 D4 D3 D2 D1 DO Corresponding Segment Line DP A S D E Intensity Control and Interdigit Blanking The MAX7219 MAX7221 allow display brightness to be controlled with an external resistor RSET connected between V and ISET The peak current sourced from the segment drivers is nominally 100 times the current entering ISET This resistor can either be fixed or vari able to allow brightness adjustment fro
8. P MAX UNITS LOGIC INPUTS DIN CLK liL VIN OV or V 1 1 HA Logic High Input Voltage VIH 3 5 V Logic Low Input Voltage VIL 0 8 V Output Voltage DOUT ISOURCE 1mA V 1 V Output Low Voltage VOL DOUT ISINK 1 6mA 0 4 V Hysteresis Voltage AVI DIN CLK LOAD CS 1 V TIMING CHARACTERISTICS CLK Clock Period tcP 100 ns CLK Pulse Width High tCH 50 ns CLK Pulse Width Low 50 ns CS Fall to SCLK Rise Setup Time ahe 25 E MAX7221 only CLK Rise to CS or LOAD Rise iesi 0 Hold Time DIN Setup Time tDs 25 ns DIN Hold Time tDH 0 ns Output Data Propagation Delay tDO CLOAD 50pF 25 ns gol so Minimum CS or LOAD Pulse 50 ng High Data to Segment Delay tDSPD 2 25 ms MAXIM 3 MAX7219 MAX7221 Serially Interfaced 8 Digit LED Display Drivers PRECOR Typical Operating Characteristics V 5V TA 25 C unless otherwise noted SCAN FREQUENCY vs SEGMENT DRIVER OUTPUT CURRENT POSITIVE SUPPLY VOLTAGE vs OUTPUT VOLTAGE 830 70 820 5 5 810 E 3 800 50 gt gt 790 5 S 780 5 770 Eom lt E 760 2 750 10 730 0 40 44 48 52 56 60 0 1 2 3 4 5 POSITIVE SUPPLY VOLTAGE V OUTPUT VOLTAGE V MAX7219 MAX7221 SEGMENT OUTPUT CURRENT SEGMENT OUTPUT CURRENT MAXIMUM INTENSITY 31 32 MAX7219 21 03 MAXIMUM INTENSITY
9. PpD5CT1 CBUS3 1uF PC2 ADC2 gt PD6 lt AIN CBUS4 PC3CADC3 PD7 lt AIN1 PC4CADC4 PC5 ADC5 PBQCICP ADCS 1 lt 0 1 ADC7 2 55 PB3 MOSD AGND PB4 MISO GND1 PBS lt SCK gt GND2 ATMEGA168 2BAU UUSB TES RESET 3U30UT GND GND2 USBDM GND3 USBDP T232RL UBUS D SHI D SH2 ID SH3 GND SH4 al USB MINI BAC 2 LED3 UUSB Mf C9 9 1uF UA78Me5 aha 50 AUTO SELECTOR gt Li dud 5U B B 9958 HEAD3X2 N a 68888 MBRO520 NOT USED XL Ex TITLE Arduino Nano2 Document Number REU 3 0 Date 7 21 2008 12 32 59 PM Sheet 1 1 Arduino Nano mio Manual Released under the Creative Commons Attribution Share Alike 2 5 License http creativecommons org licenses by sa 2 5 More information www arduino cc Rev 3 0 rduino Nano Pin Layout ND RST 1 5 ARDUINO CC m NEN a GRAUITECH US A RST GND UIN PUR I ae A7 5U 3 RsT lt o N lt lt lt L m 2 O 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 NM 1 2 5 16 00 013 Digital input output port O to 13 3 28 RESET Input Reset active low 4 29 GND PWR Supply ground 17 3V3 Output 3 3V output from
10. ROPRIETARY INFORMATION 4 CONTROLLING DIMENSION MILLIMETERS 5 MEETS JEDEC MS013 PACKAGE OUTLINE 300 SOIC 6 N NUMBER OF PINS DOCUMENT CONTROL 21 0042 MAXLAVI 15 MAX7219 MAX7221 Serially Interfaced 8 Digit LED Display Drivers Package Information continued 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 PDIPN EPS 2 2222 sad 0 15 LL I eB INCHES MILLIMETERS INCHES MILLIMETERS MIN MAX MIN MAX MIN MAX N 0001 0180 4 572 D 6348 0 390 8 IAB 110 015 1038 D 0735 0 765 18 67 19 43 14 AC 2 0125 0175 318 1445 D 0 745 0 765 18 92 19 43 16 AA 310 055 0 080 1 40 2 03 D 0 885 0 915 22 48 23 24 18 AD 1 015 1 045 25 78 26 54 0 045 0 065 114 1265 28 96 32 13 24 0 008 0 014 D 1 360 1 380 34 54 35 05 28 x5 0 005 0 080 0 300 10 325 NOTES 024010317 EM EXCEED 15mm 0067 1 2 0100 BSC 3 CONTROLLING DIMENSIDN MILLIMETER eA 0 300 BSC 762 BSC 4 MEETS JEDEC 5001 AS SHOWN B 5 6 IN ABOVE TABLE eB 0 400 BSC 10 16 BSC L j0115 0150 2 921 3 81 SIMILIAR TO 058 N NUMBER OF PINS
11. at DIN sent in 16 bit packets is shifted into the internal 16 bit shift register with each rising edge of CLK regardless of the state of LOAD For the MAX7221 CS must be low to clock data in or out The data is then latched into either the digit or control registers on the rising edge of LOAD CS LOAD CS must go high concurrently with or after the 16th rising clock edge but before the next rising clock edge or data will be lost Data at DIN is propagated through the shift register and appears at DOUT 16 5 clock cycles later Data is clocked out on the falling edge of CLK Data bits are labeled DO D15 Table 1 D8 D11 contain the register address DO D7 contain the data and D12 D15 are don t care bits The first received is D15 the most significant bit MSB Digit and Control Registers Table 2 lists the 14 addressable digit and control regis ters The digit registers are realized with an on chip 8x8 dual port SRAM They are addressed directly so that individual digits can be updated and retain data as long as V typically exceeds 2V The control registers consist of decode mode display intensity scan limit number of scanned digits shutdown and display test all LEDs on Shutdown Mode When the MAX7219 is in shutdown mode the scan oscil lator is halted all segment current sources are pulled to ground and all digit drivers are pulled to thereby blanking the display The MAX7221 is identical except the drivers are hig
12. bility ELECTRICAL CHARACTERISTICS V 5V 1096 RSET 9 53kQ 1 TA gt TMIN to Tmax unless otherwise noted PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Operating Supply Voltage 4 0 5 5 V Shutdown Supply Current l All digital inputs at V or GND TA 25 150 RSET circuit 8 Operating Supply Current l All segments and decimal point on mA 330 ISEG_ 40mA Display Scan Rate fosc 8 digits scanned 500 800 1300 Hz Digit Drive Sink Current IDIGIT V 5V VouT 0 65V 320 mA Segment Drive Source Current ISEG TA 25 C V 5V VouT V 1V 30 40 45 mA Segment Current Slew Rate 5 _ _ MAX7221 oniy AlsEG At TA 25 C V 5V VOUT V 1V 10 20 50 mA us Segment Drive Current Matching AlsEG 3 0 926 Digit Drive Leakage _ _ MAX7221 only IDIGIT Digit off VDIGIT V 10 HA Segment Drive Leakage _ MAX7221 only ISEG Segment off VSEG OV 1 HA Digit Drive Source Current _ MAX7219 only IDIGIT Digit off VDIGIT V 0 3V 2 mA Segment Drive Sink Current _ 7219 only ISEG Segment off VSEG 0 3V 5 mA 2 MAKIM Serially Interfaced 8 Digit LED Display Drivers ELECTRICAL CHARACTERISTICS continued V 5V 10 RsET 9 53kQ 1 TA TMIN to Tmax unless otherwise noted PARAMETER SYMBOL CONDITIONS MIN TY
13. e Voltage VR V Operating Temperature Range Topr iC Storage Temperature Range Tstg 2 V Static Voltage Var Lead Sodering Temperature 260 C for 3 seconds 25 C Ifim Ifp Id 0 36mA C 0 86mA C 0 75mW C Ifm Ek 60 For operation above 25 The Ifm amp Pd must be derated Curent derating is 0 36mA C for DC drive and 0 86mA C for Pulse drive the power dissipation is 8 0 75mW C The product working current must not more than 60 of the Ifm or according to the working temperature Optical Electrical Characteristic gt Parameter Min Type A Test CONDITING Symbol m Luminous Intensity 10 25 9 Forward Voltage Ir 10mA REVERSE Current R 5V Peak Wavelength Spectral Bandwidth 1 View Angle 3 Mechanical Outline AVERY 24 Unspecified Tole
14. h impedance Data in the digit and control registers remains unaltered Shutdown can be used to save power or as an alarm to flash the display by successively entering and leaving shutdown mode For minimum supply current in shutdown mode logic inputs should be at ground or V CMOS logic levels Typically it takes less than 250 for the MAX7219 MAX7221 to leave shutdown mode The display driver can be programmed while in shutdown mode and shutdown mode can be overridden by the display test function MAXIM Serially Interfaced 8 Digit LED Display Drivers Table 2 Register Address Map ADDRESS REGISTER D15 Dio pg pg CODE D12 0 0 0 0 OxXO Digit 0 X 0xX1 Digit 1 X olola o Digit 2 X 0 1 1 063 Digit 3 X o 1 oxxa Digit 4 X 0 1 OxX5 Digit 5 x 1 1 0 Oxx6 Digit 6 x 0 1 1 OxX7 Digit 7 X 0 o o oxx8 d x 1 0 OxX9 ntensity X 1 0 1 0 OxXA Scan Limit X 1 0 1 1 OxXB Shutdown X 1 1 0 0 OxXC 7 X 1 1 1 OxXF Initial Power Up 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
15. its minimum value Decode Mode Register The decode mode register sets BCD code B 0 9 E H L P and or no decode operation for each digit Each bit in the register corresponds to one digit A logic high selects code B decoding while logic low bypasses the decoder Examples of the decode mode control regis ter format are shown in Table 4 When the code B decode mode is used the decoder looks only at the lower nibble of the data in the digit registers 03 00 disregarding bits 04 06 D7 which sets the decimal point SEG DP is independent of the decoder and is positive logic D7 1 turns the decimal point on Table 5 lists the code B font When no decode is selected data bits D7 DO corre spond to the segment lines of the MAX7219 MAX7221 Table 6 shows the one to one pairing of each data bit to the appropriate segment line Table 3 Shutdown Register Format Address Hex 0xXC REGISTER DATA MODE ADDRESS CODE HEX D7 D6 D5 D4 D3 D2 D1 D0 OxXC X X X X X x x 0 Mode OxXC X X x x x x x 1 Operation Table 4 Decode Mode Register Examples Address Hex 9 REGISTER DATA HEX DECODE MODE D7 D6 D5 D4 D3 D2 D1 D0 CODE No decode for digits 7 0 0 0 0 0 0 0 0 0 0 00 Code decode for digit 0 No decode for digits 7 1 9 0 a 0 0 1 070 Code decode for digits 3 0 No decode for digits 7
16. l transistors to drive 2 3 AND2307SLC common cathode displays The 5 6V zener diode has been added in series with the decimal point LED because the decimal point LED forward volt age is typically 4 2V For all other segments the LED forward voltage is typically 8V Since external transis tors are used to sink current DIG O and DIG 1 are used as logic switches peak segment currents of 45mA are allowed even though only two digits are displayed In applications where the MAX7219 MAX7221 s digit dri vers are used to sink current and fewer than four digits are displayed Table 9 specifies the maximum allow able segment current RSET must be selected accord ingly Table 11 Refer to the Power Dissipation section of the Absolute Maximum Ratings to calculate acceptable limits for ambient temperature segment current and the LED forward voltage drop MAXIM Serially Interfaced 8 Digit LED Display Drivers Table 11 RSET vs Segment Current and LED Forward Voltage VLED V Ises m 5 20 25 30 35 40 122 118 110 106 969 30 178 171 158 150 140 20 298 280 259 245 226 10 667 637 593 554 512 Computing Power Dissipation The upper limit for power dissipation PD for the MAX7219 MAX7221 is determined from the following equation PD V x 8mA V VLED DUTY x ISEG x N where supply voltage DUTY duty cycle set by intensity register
17. lecting 18 ISET Rset Resistor section 19 V Positive Supply Voltage Connect to 5V 24 DOUT Serial Data Output The data into DIN is valid at DOUT 16 5 clock cycles later This pin is used to daisy chain several MAX7219 MAX7221 s and is never high impedance Functional Diagram SEG A SEG G DP G 0 DIG 7 SEGMENT DRIVERS QIT DRIVERS CODE DE REGISTER ROM WITH 25 55 ENSITY REGISTER LIMIT REGISTER SEGMENT DISPLAY TEST REGISTER CURRENT 8x8 REFERENCE DUAL PORT ADDRESS REGISTER DECODER DI ucc CUDEDEDESCEPET LSB MSB MAX7221 ONLY MAKIM 5 LCcZXVM 6LCZXVM MAX7219 MAX7221 Serially Interfaced 8 Digit LED Display Drivers CS N OR LOAD 1 1 655 3 a ECL ilH o CLK N eee tp Figure 1 Timing Diagram Table 1 Serial Data Format 16 Bits i Am tesw 1 1 lt 100 gt m D15 D14 D13 D12 D11 D10 D9 D8 D7 06 D5 D4 D3 D2 D1 DO X X X X ADDRESS MSB DATA LSB Detailed Description MAX7219 MAX7221 Differences The MAX7219 and MAX7221 are identical except for two parameters the MAX7221 segment drivers are slew rate limited to reduce electromagnetic interfer ence EMI and its serial interface is fully SPI compati ble Serial Addressing Modes For the MAX7219 serial data
18. m the front panel minimum value should be 9 53kO which typi cally sets the segment current at 40mA Display bright ness can also be controlled digitally by using the intensity register Digital control of display brightness is provided by an internal pulse width modulator which is controlled by the lower nibble of the intensity register The modulator scales the average segment current in 16 steps from a maximum of 31 32 down to 1 32 of the peak current set by RSET 15 16 to 1 16 on MAX7221 Table 7 lists the intensity register format The minimum interdigit blank ing time is set to 1 32 of a cycle MAXIM Serially Interfaced 8 Digit LED Display Drivers Table 7 Intensity Register Format Address Hex OxXA DUTY CYCLE HEX D7 D6 D5 04 03 02 D1 00 MAX7219 MAX7221 CODE E iod Es a X X X X 0 0 0 0 OxXO 3 32 2 16 X X X X 0 0 0 1 OxX1 5 32 3 16 X X X X 0 0 1 0 OxX2 7 32 4 16 X X X X 0 0 1 1 OxX3 9 32 5 16 X X X X 0 1 0 0 0xX4 11 32 6 16 X X X X 0 1 0 OxX5 13 32 7 16 X X X X 0 1 1 0 OxX6 15 32 8 16 X X X X 0 1 1 OxX7 17 32 9 16 X X X X 1 0 0 0 OxX8 19 32 10 16 X X X X 0 0 OxX9 21 32 11 16 X X X X 0 1 0 23 32 12 16 X X X X 1 0 1 1 OxXB 25 32 13 16 X X X X 1 0 0 OxXC 27 32 14 16 X X X X 1 0 OxXD 29 32 15 16 X X X X 1 1 0 OxXE 31 32 a i X X X X 1 1 1 OxXF Table 8 Scan Limit Register Format Address Hex
19. nductor Corp MAXIM Maxim Integrated Products 1 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 LCcZXVM 6LCZXVM MAX7219 MAX7221 Serially Interfaced 8 Digit LED Display Drivers ABSOLUTE MAXIMUM RATINGS Voltage with respect to GND Operating Temperature Ranges TMIN to TMAX VE n 0 3V to 6V MAX7219C_G MAX7221C_G 0 C to 70 C DIN LOAD CS 0 3V to 6V 7219 G MAX7221E 0 40 C to 85 C All Other PINS 0 tes 0 3V to V 0 3V Storage Temperature Range 65 C to 160 C Current Lead Temperature soldering 108 anan 300 C DIGO DIG7 Sink Current 500mA SEGA G DP Source 100mA Continuous Power Dissipation TA 85 C arrow Plastic DIP derate 13 3mW C above 70 C 1066mW Wide SO derate 11 8mW C above 702C 941mW arrow CERDIP derate 12 5mW C above 70 C 1000mW Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device These are stress ratings only and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied Exposure to absolute maximum rating conditions for extended periods may affect device relia
20. o 85 C 24 Narrow Plastic DIP MAX7221EWG 40 to 85 C 24 Wide SO MAX7221ERG 409 to 85 C 24 Narrow CERDIP Dice are specified at Ta 25 14 Chip Topography GND 067 063 DIG2 DIG6 GND DIG 5 DIG 4 DiG1 BI neco LOAD 42 HIT 0 093 on EB 236mm iam SEGA E Nm seco SEG ISET 5 6 SEG SEG G SEG E 0 080 2 03mm TRANSISTOR COUNT 5267 SUBSTRATE CONNECTED TO GND MAXIM Serially Interfaced 8 Digit LED Display Drivers Package Information 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 CD INCHES MILLIMETERS 5 N Gan ec 8 0 093 0 104 2 35 2 65 0 004 0 012 0 10 0 30 0 014 0 019 0 35 0 49 0 009 0 013 0 23 0 32 0 050 1 27 0 291 0 299 7 40 7 60 O A H H H H VARIATIONS INCHES MILLIMETERS TOP VIEW we AL A lt XL ier FRONT VIEW SIDE VIEW NOTES 1 D amp E DO NOT INCLUDE MOLD FLASH 2 MOLD FLASH PROTRUSIONS 0 15mm 006 3 LEADS COPLANAR WITHIN 0 10mm 004 P
21. rances is X0 2 KANG COLOR o _2 50 7 17 50 esias 2 50 7 20 00 OOOOOOOOo OOOOOOOO OOOOOOOOn OOOOOOOOo OOOOOOOO 2 2 50 7 17 50 1500 Circuit Diagram PCB FJ788A B 5 Storage amp Soldering Condions Store with care Storing the units in bad condition will cause the reflector sheet and decrease 1 s SABE adhesive power Storage the products under the 25 C 10 C condition temperature 25 C 10C and humidity 65 CCRH 4 20 CCRH 65 C 20 our recommendation The Soldering Temperature is 260 5 and Soldering 260C 5C 3 Bb Time should be less than 3 sec and soldering iron 30W power should be less than 30W The soldering point should be farther than 1 6mm 1 6mm from
22. righter because its duty cycle per digit will be 1 5 while the first display s will be 1 6 Refer to the No Op Register section for additional infor mation 11 LCcZXVM 6LCZXVM MAX7219 MAX7221 Serially Interfaced 8 Digit LED Display Drivers 1N5524B 5 6V 5 DATAIN LOAD CS CLOCK EB EG EC gt gt gt gt gt gt gt gt AND2307SLC E DP EA ED CATHODE 8 MAXIM MAX7219 MAX7221 4 7kQ PULLUP REQUIRED FOR 7221 MAX7221 ONLY Figure 2 MAX7219 MAX7221 Driving 2 3in Displays 12 gt gt gt gt gt gt gt D NC2 COM1 MAXIM INT MAX394 2 IN COM2 NO1 N02 AND2307SLC ED CATHODE 8 IRF540 IRF540 MAXIM Serially Interfaced 8 Digit LED Display Drivers By DATA IN ay 8 MAX7219 MAX7221 5V EYE 9 93 2 MAXIM MAX7219 MAX7221 LOAD DATA gt 9 MAX7221 ONLY CLOCK Figure Cascading MAX7219 MAX7221s to Drive 16 Seven Segment LED Digits MAXIM 13 LCcZXVM 6LCZXVM MAX7219 MAX7221 Serially Interfaced 8 Digit LED Display Drivers Ordering Information continued PART TEMP RANGE PIN PACKAGE MAX7221CNG 0 C to 70 C 24 Narrow Plastic DIP MAX7221CWG 0 C to 70 C 24 Wide SO MAX7221C D 0 C to 70 C Dice MAX7221ENG 40 t
23. ts and a test mode that forces all LEDs on For applications requiring 3V operation or segment blinking refer to the MAX6951 data sheet Applications Panel Meters LED Matrix Displays Bar Graph Displays Industrial Controllers Pin Configuration TOP VIEW G5 G1 LOAD CS MAX7221 ONLY DIP SO Features 10MHz Serial Interface Individual LED Segment Control Decode No Decode Digit Selection 150p A Low Power Shutdown Data Retained Digital and Analog Brightness Control Display Blanked on Power Up Drive Common Cathode LED Display 9 9 Slew Rate Limited Segment Drivers for Lower EMI MAX7221 SPI QSPI MICROWIRE Serial Interface MAX7221 24 Pin DIP and SO Packages 9 Ordering Information PART TEMP RANGE 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 Ta 25 C Typical Application Circuit ISET DIG 0 DIG7 MAXIM DIN MAX7219 MAX7221 LOAD CS SEG A G 8 SEGMENTS 8DIGITS 8 DIGIT uP DISPLAY MAX7221 ONLY SPI and QSPI are trademarks of Motorola Inc MICROWIRE is a trademark of National Semico
24. ur MAX7219s are cascaded then to write to the 10 fourth chip sent the desired 16 bit word followed by three no op codes hex OxXXOX see Table 2 When LOAD CS goes high data is latched in all devices The first three chips receive no op commands and the fourth receives the intended data Applications Information Supply Bypassing and Wiring To minimize power supply ripple due to the peak digit driver currents connect 10uF electrolytic and a 0 1uF ceramic capacitor between V and GND as close to the device as possible The MAX7219 MAX7221 should be placed in close proximity to the LED display and connections should be kept as short as possible to minimize the effects of wiring inductance and electro magnetic interference Also both GND pins must be connected to ground Selecting Rset Resistor and Using External Drivers The current per segment is approximately 100 times the current in ISET To select see Table 11 MAX7219 MAX7221 s maximum recommended seg ment current is 40mA For segment current levels above these levels external digit drivers will be need ed In this application the MAX7219 MAX7221 serve only as controllers for other high current drivers or tran sistors Therefore to conserve power use RSET 47kQ when using external current sources as segment dri vers The example in Figure 2 uses the MAX7219 MAX7221 s segment drivers a MAX394 single pole double throw analog switch and externa
25. ver power dissipation Table 9 lists the number of digits displayed and the corresponding maximum recommended segment cur rent when the digit drivers are used Display Test Register The display test register operates in two modes normal and display test Display test mode turns all LEDs on by overriding but not altering all controls and digit reg isters including the shutdown register In display test mode 8 digits are scanned and the duty cycle is 31 32 15 16 for MAX7221 Table 10 lists the display test reg ister format Table 9 Maximum Segment Current for 1 2 or 3 Digit Displays NUMBER OF DIGITS DISPLAYED 1 10 2 20 3 30 Table 10 Display Test Register Format Address Hex OxXF MODE REGISTER DATA D7 D6 05 04 03 02 D1 DO Normal x to Operation Display Test X X x x x x x 1 Mode Note The MAX7219 MAX7221 remain in display test mode all LEDs on until the display test register is reconfigured for normal operation Register The no op register is used when cascading MAX7219s MAX7221s Connect devices LOAD CS inputs together and connect DOUT to DIN on adjacent devices DOUT is a CMOS logic level output that easily drives DIN of successively cascaded parts Refer to the Serial Addressing Modes section for detailed infor mation on serial input output timing For example if fo
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