Arduino Nano 3.0 COLUMN MAX 7219 ROW ROW PIN CONFIG 1 (DIN) (GND) 29 2 (DIG 0) (SEG D) 23 (SEG DP) 22 4 (GND) 3 (DIG 4) 4 (GND) (SEG E) 21 (SEG C) 20

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1 3 2 (GND) 29 (DIN) (DIG ) (SEG D) 23 4 (GND) 27 3 (DIG 4) (SEG DP) Arduino Nano (GND) 5 (DIG 2) 6 (DIG 2) 7 (DIG 3) (DIG 7) 9 (GND) (SEG E) 2 (SEG C) 2 (V+)9 (ISET) (SEG G) 7 (SEG B) 6 C R COLUMN (DIG 5) (DIG ) (SEG F) 5 (SEG A) (D) 2 (LOAD) (CLK)3 4 (D) (D2) 6 MA 729 GRND MA x DOT MATRI 9 MA x DOT MATRI 3 ROW ROW PIN CONFIG 5

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3 Arduino Nano (V3.) User Manual Released under the Creative Commons Attribution Share-Alike 2.5 License More information: Rev 3.

4 Arduino Nano Pin Layout D/T () (3) VIN D/R (2) (29) GND RESET (3) (2) RESET GND (4) (27) +5V D2 (5) (26) A7 D3 (6) (25) A6 D4 (7) (24) A5 D5 () (23) A4 D6 (9) (22) A3 D7 () (2) A2 D () (2) A D9 (2) (9) A D (3) () AREF D (4) (7) 3V3 D2 (5) (6) D3 Pin No. Name Type Description -2, 5-6 D-D3 I/O Digital input/output port to 3 3, 2 RESET Input Reset (active low) 4, 29 GND PWR Supply ground 7 3V3 Output +3.3V output (from FTDI) AREF Input ADC reference 9-26 A-A7 Input Analog input channel to V Output or Input 3 VIN PWR Supply voltage +5V output (from on-board regulator) or +5V (input from external power supply) 2

5 Arduino Nano Mechanical Drawing.5.7 (4)

6 9-4452; Rev 4; 7/3 Serially Interfaced, -Digit LED Display Drivers General Description The MA729/MA722 are compact, serial input/output common-cathode display drivers that interface microprocessors (µps) to 7-segment numeric LED displays of up to 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 x static RAM that stores each digit. Only one external resistor is required to set the segment current for all LEDs. The MA722 is compatible with SPI, QSPI, and MICROWIRE, and has slewrate-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 MA729/MA722 also allow the user to select code- B decoding or no-decode for each digit. The devices include a 5µA low-power shutdown mode, analog and digital brightness control, a scanlimit register that allows the user to display from to digits, and a test mode that forces all LEDs on. For applications requiring 3V operation or segment blinking, refer to the MA695 data sheet. Bar-Graph Displays Industrial Controllers Applications Panel Meters LED Matrix Displays Pin Configuration Features MHz Serial Interface Individual LED Segment Control Decode/No-Decode Digit Selection 5µA 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 (MA722) SPI, QSPI, MICROWIRE Serial Interface (MA722) 24-Pin DIP and SO Packages Ordering Information PART TEMP RANGE PIN-PACKAGE MA729CNG MA729CWG MA729C/D C to +7 C C to +7 C C to +7 C 24 Narrow Plastic DIP 24 Wide SO Dice* MA729ENG -4 C to +5 C 24 Narrow Plastic DIP MA729EWG -4 C to +5 C 24 Wide SO MA729ERG -4 C to +5 C 24 Narrow CERDIP Ordering Information continued at end of data sheet. *Dice are specified at T A = +25 C. Typical Application Circuit MA729/MA722 TOP VIEW DIN 24 DOUT DIG 2 23 SEG D DIG SEG DP +5V GND DIG 6 DIG 2 DIG 3 DIG 7 GND DIG 5 DIG MA729 MA SEG E SEG C V+ ISET SEG G SEG B SEG F SEG A MOSI µp I/O SCK 9.53k I SET DIN LOAD (CS) CLK GND V+ 9 MA729 MA722 GND DIG DIG 7 SEG A G, SEG DP DIGITS SEGMENTS LOAD (CS) 2 3 CLK 4 ( ) MA722 ONLY DIP/SO ( ) MA722 ONLY -DIGIT µp DISPLAY 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 , or visit Maxim s website at

7 Serially Interfaced, -Digit LED Display Drivers MA729/MA722 ABSOLUTE MAIMUM RATINGS Voltage (with respect to GND) V V to 6V DIN, CLK, LOAD, CS...-.3V to 6V All Other Pins...-.3V to (V+ +.3V) Current DIG DIG7 Sink Current...5mA SEGA G, DP Source Current...mA Continuous Power Dissipation (T A = +5 C) Narrow Plastic DIP (derate 3.3mW/ C above +7 C)...66mW Wide SO (derate.mw/ C above +7 C)...94mW Narrow CERDIP (derate 2.5mW/ C above +7 C)...mW 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 reliability. ELECTRICAL CHARACTERISTICS (V+ = 5V ±%, R SET = 9.53kΩ ±%, T A = T MIN to T MA, unless otherwise noted.) Operating Temperature Ranges (T MIN to T MA ) MA729C_G/MA722C_G... C to +7 C MA729E_G/MA722E_G...-4 C to +5 C Storage Temperature Range C to +6 C Lead Temperature (soldering, s)...+3 C PARAMETER SYMBOL CONDITIONS MIN TYP MA UNITS Operating Supply Voltage Shutdown Supply Current Operating Supply Current Display Scan Rate Digit Drive Sink Current Segment Drive Source Current Segment Current Slew Rate (MA722 only) Segment Drive Current Matching Digit Drive Leakage (MA722 only) Segment Drive Leakage (MA722 only) Digit Drive Source Current (MA729 only) Segment Drive Sink Current (MA729 only) V+ I+ I+ f OSC I DIGIT I SEG I SEG / t I SEG I DIGIT I SEG I DIGIT I SEG All digital inputs at V+ or GND, T A = +25 C R SET = open circuit All segments and decimal point on, I SEG_ = -4mA digits scanned V+ = 5V, V OUT =.65V T A = +25 C, V+ = 5V, V OUT = (V+ - V) T A = +25 C, V+ = 5V, V OUT = (V+ - V) Digit off, V DIGIT = V V µa ma Hz ma ma ma/µs Segment off, V SEG = V µa Digit off, V DIGIT = (V+ -.3V) Segment off, V SEG =.3V -2 5 % µa ma ma 2

8 Serially Interfaced, -Digit LED Display Drivers ELECTRICAL CHARACTERISTICS (continued) (V+ = 5V ±%, R SET =9.53kΩ ±%, T A = T MIN to T MA, unless otherwise noted.) LOGIC INPUTS PARAMETER Input Current DIN, CLK, LOAD, CS Logic High Input Voltage Logic Low Input Voltage Output High Voltage Output Low Voltage Hysteresis Voltage TIMING CHARACTERISTICS CLK Clock Period CLK Pulse Width High CLK Pulse Width Low SYMBOL I IH, I IL V IH V IL V OH V OL V I t CP t CH t CL V IN = V or V+ DOUT, I SOURCE = -ma DOUT, I SINK =.6mA DIN, CLK, LOAD, CS CONDITIONS MIN TYP MA V UNITS µa V V V V V ns ns ns MA729/MA722 CS Fall to SCLK Rise Setup Time (MA722 only) t CSS 25 ns CLK Rise to CS or LOAD Rise Hold Time t CSH ns DIN Setup Time t DS 25 ns DIN Hold Time t DH ns Output Data Propagation Delay t DO C LOAD = 5pF 25 ns Load-Rising Edge to Next Clock Rising Edge (MA729 only) t LDCK 5 ns Minimum CS or LOAD Pulse High t CSW 5 ns Data-to-Segment Delay t DSPD 2.25 ms 3

9 Serially Interfaced, -Digit LED Display Drivers MA729/MA722 Typical Operating Characteristics (V+ = +5V, T A = +25 C, unless otherwise noted.) SCAN FREQUENCY (Hz) SCAN FREQUENCY vs. POSITIVE SUPPLY VOLTAGE POSITIVE SUPPLY VOLTAGE (V) MA729/2 OUTPUT CURRENT (ma) SEGMENT DRIVER OUTPUT CURRENT vs. OUTPUT VOLTAGE R SET = kω R SET = 2kΩ R SET = 4kΩ OUTPUT VOLTAGE (V) MA729/2 2 MA729 SEGMENT OUTPUT CURRENT MA722 SEGMENT OUTPUT CURRENT MAIMUM INTENSITY = 3/32 MA729/2 3 MAIMUM INTENSITY = 5/6 MA729/2 4 ma/div ma/div 5µs/div 5µs/div 4

10 Serially Interfaced, -Digit LED Display Drivers PIN NAME FUNCTION Pin Description DIN Serial-Data Input. Data is loaded into the internal 6-bit shift register on CLK s rising edge. 2, 3, 5,, 4 7, 2 23 DIG DIG 7 3 CLK SEG A SEG G, DP Eight-Digit Drive Lines that sink current from the display common cathode. The MA729 pulls the digit outputs to V+ when turned off. The MA722 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 6 bits of serial data are latched on LOAD s rising edge. (MA729) 2 CS Chip-Select Input. Serial data is loaded into the shift register while CS is low. The last 6 bits of (MA722) serial data are latched on CS s rising edge. Serial-Clock Input. MHz maximum rate. On CLK s rising edge, data is shifted into the internal shift register. On CLK s falling edge, data is clocked out of DOUT. On the MA722, the CLK input is active only while CS is low. Seven Segment Drives and Decimal Point Drive that source current to the display. On the MA729, when a segment driver is turned off it is pulled to GND. The MA722 segment drivers are high-impedance when turned off. ISET Connect to V DD through a resistor (R SET ) to set the peak segment current (Refer to Selecting R SET Resistor section). 9 V+ Positive Supply Voltage. Connect to +5V. 24 DOUT Serial-Data Output. The data into DIN is valid at DOUT 6.5 clock cycles later. This pin is used to daisy-chain several MA729/MA722 s and is never high-impedance. MA729/MA722 Functional Diagram SEG A SEG G, DP DIG DIG 7 SEGMENT DRIVERS DIGIT DRIVERS LOAD (CS) SEGMENT CURRENT REFERENCE V+ R SET CODE B ROM WITH BYPASS x DUAL-PORT SRAM ADDRESS REGISTER DECODER SHUTDOWN REGISTER MODE REGISTER INTENSITY REGISTER SCAN-LIMIT REGISTER DISPLAY-TEST REGISTER INTENSITY PULSE- WIDTH MODULATOR MULTIPLE SCAN CIRCUITRY 4 DIN D D D2 D3 D4 D5 D6 D7 D D9 D D D2 D3 D4 D5 DOUT CLK ( ) MA722 ONLY (LSB) (MSB) 5

11 Serially Interfaced, -Digit LED Display Drivers MA729/MA722 CS OR LOAD CLK DIN DOUT Figure. Timing Diagram t CSH t CSS t CL t CH t CP t DH t DS D5 D4 D D t DO t CSW t LDCK Table. Serial-Data Format (6 Bits) D5 D4 D3 D2 D D D9 D D7 D6 D5 D4 D3 D2 D D ADDRESS MSB MSBDATA LSB Detailed Description MA729/MA722 Differences The MA729 and MA722 are identical except for two parameters: the MA722 segment drivers are slew-rate limited to reduce electromagnetic interference (EMI), and its serial interface is fully SPI compatible. Serial-Addressing Modes For the MA729, serial data at DIN, sent in 6-bit packets, is shifted into the internal 6-bit shift register with each rising edge of CLK regardless of the state of LOAD. For the MA722, 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 6th 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 6.5 clock cycles later. Data is clocked out on the falling edge of CLK. Data bits are labeled D D5 (Table ). D D contain the register address. D D7 contain the data, and D2 D5 are don t care bits. The first received is D5, the most significant bit (MSB). Digit and Control Registers Table 2 lists the 4 addressable digit and control registers. The digit registers are realized with an on-chip, x 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 MA729 is in shutdown mode, the scan oscillator is halted, all segment current sources are pulled to ground, and all digit drivers are pulled to V+, thereby blanking the display. The MA722 is identical, except the drivers are high-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 25µs for the MA729/ MA722 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. 6

12 Serially Interfaced, -Digit LED Display Drivers Table 2. Register Address Map REGISTER ADDRESS No-Op Digit Digit Digit 2 Digit 3 Digit 4 Digit 5 Digit 6 Digit 7 Decode Mode D5 D2 Intensity Scan Limit Shutdown Display Test D D D9 D HE CODE x x x2 x3 x4 x5 x6 x7 x x9 xa xb xc xf Initial Power-Up On initial power-up, all control registers are reset, the display is blanked, and the MA729/MA722 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. Decode-Mode Register The decode-mode register sets BCD code B (-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-register 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 (D3 D), disregarding bits D4 D6. D7, which sets the decimal point (SEG DP), is independent of the decoder and is positive logic (D7 = turns the decimal point on). Table 5 lists the code B font. When no-decode is selected, data bits D7 D correspond to the segment lines of the MA729/MA722. Table 6 shows the one-to-one pairing of each data bit to the appropriate segment line. MA729/MA722 Table 3. Shutdown Register Format (Address (Hex) = xc) MODE REGISTER DATA ADDRESS CODE (HE) D7 D6 D5 D4 D3 D2 D D Shutdown Mode xc Normal Operation xc Table 4. Decode-Mode Register Examples (Address (Hex) = x9) DECODE MODE D7 D6 No decode for digits 7 Code B decode for digit No decode for digits 7 Code B decode for digits 3 No decode for digits 7 4 Code B decode for digits 7 REGISTER DATA HE D5 D4 D3 D2 D D CODE x x xf xff 7

13 Serially Interfaced, -Digit LED Display Drivers MA729/MA722 Table 5. Code B Font 7-SEGMENT CHARACTER D7* D6 D4 REGISTER DATA D3 D2 D D DP* A B ON SEGMENTS = C D E E H L P blank F G *The decimal point is set by bit D7 = Table 6. No-Decode Mode Data Bits and Corresponding Segment Lines E F D Corresponding Segment Line G A D7 DP C B DP D6 A STANDARD 7-SEGMENT LED REGISTER DATA D5 D4 D3 D2 B C D E D F D G Intensity Control and Interdigit Blanking The MA729/MA722 allow display brightness to be controlled with an external resistor (R SET ) connected between V+ and ISET. The peak current sourced from the segment drivers is nominally times the current entering ISET. This resistor can either be fixed or variable to allow brightness adjustment from the front panel. Its minimum value should be 9.53kΩ, which typically sets the segment current at 4mA. Display brightness 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 6 steps from a maximum of 3/32 down to /32 of the peak current set by R SET (5/6 to /6 on MA722). Table 7 lists the intensity register format. The minimum interdigit blanking time is set to /32 of a cycle.

14 Serially Interfaced, -Digit LED Display Drivers Table 7. Intensity Register Format (Address (Hex) = xa) MA729 /32 (min on) DUTY CYCLE MA722 /6 (min on) 3/32 2/6 5/32 3/6 7/32 4/6 9/32 5/6 /32 6/6 3/32 7/6 5/32 /6 7/32 9/6 9/32 /6 2/32 /6 23/32 2/6 25/32 3/6 27/32 4/6 29/32 5/6 3/32 5/6 (max on) D7 D6 D5 D4 D3 D2 D D HE CODE x x x2 x3 x4 x5 x6 x7 x x9 xa xb xc xd xe xf MA729/MA722 Table. Scan-Limit Register Format (Address (Hex) = xb) SCAN LIMIT Display digit only* Display digits & * Display digits 2* Display digits 2 3 Display digits Display digits Display digits Display digits D7 REGISTER DATA HE D6 D5 D4 D3 D2 D D CODE x x x2 x3 x4 x5 x6 x7 *See Scan-Limit Register section for application. Scan-Limit Register The scan-limit register sets how many digits are displayed, from to. They are displayed in a multiplexed manner with a typical display scan rate of Hz with digits displayed. If fewer digits are displayed, the scan rate is fosc/n, where N is the number of digits scanned. Since the number of scanned digits affects the display brightness, the scan-limit register should not be used to blank portions of the display (such as leading zero suppression). Table lists the scan-limit register format. 9

15 Serially Interfaced, -Digit LED Display Drivers MA729/MA722 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. 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 registers (including the shutdown register). In display-test mode, digits are scanned and the duty cycle is 3/32 (5/6 for MA722). Table lists the display-test register format. Table 9. Maximum Segment Current for -, 2-, or 3-Digit Displays NUMBER OF DIGITS DISPLAYED 2 3 MAIMUM SEGMENT CURRENT (ma) 2 3 Table. Display-Test Register Format (Address (Hex) = xf) MODE Normal Operation Display Test Mode D7 D6 REGISTER DATA D5 D4 D3 D2 No-Op Register The no-op register is used when cascading MA729s or MA722s. Connect all 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 information on serial input/output timing.) For example, if four MA729s are cascaded, then to write to the D Note: The MA729/MA722 remain in display-test mode (all LEDs on) until the display-test register is reconfigured for normal operation. D fourth chip, sent the desired 6-bit word, followed by three no-op codes (hex x, 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 a µf electrolytic and a.µf ceramic capacitor between V+ and GND as close to the device as possible. The MA729/MA722 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 electromagnetic interference. Also, both GND pins must be connected to ground. Selecting R SET Resistor and Using External Drivers The current per segment is approximately times the current in ISET. To select R SET, see Table. The MA729/MA722 s maximum recommended segment current is 4mA. For segment current levels above these levels, external digit drivers will be needed. In this application, the MA729/MA722 serve only as controllers for other high-current drivers or transistors. Therefore, to conserve power, use R SET = 47kΩ when using external current sources as segment drivers. The example in Figure 2 uses the MA729/MA722 s segment drivers, a MA394 single-pole double-throw analog switch, and external transistors to drive 2.3 AND237SLC common-cathode displays. The 5.6V zener diode has been added in series with the decimal point LED because the decimal point LED forward voltage is typically 4.2V. For all other segments the LED forward voltage is typically V. Since external transistors are used to sink current (DIG and DIG are used as logic switches), peak segment currents of 45mA are allowed even though only two digits are displayed. In applications where the MA729/MA722 s digit drivers are used to sink current and fewer than four digits are displayed, Table 9 specifies the maximum allowable segment current. R SET must be selected accordingly (Table ). 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.

16 Serially Interfaced, -Digit LED Display Drivers Table. RSET vs. Segment Current and LED Forward Voltage I SEG (ma) V LED (V) Computing Power Dissipation The upper limit for power dissipation (PD) for the MA729/MA722 is determined from the following equation: PD = (V + x ma) + (V+ - VLED)(DUTY x ISEG x N) where: V+ = supply voltage DUTY = duty cycle set by intensity register N = number of segments driven (worst case is ) VLED = LED forward voltage ISEG = segment current set by RSET Dissipation Example: I SEG = 4mA, N =, DUTY = 3/32, V LED =.V at 4mA, V+ = 5.25V PD = 5.25V(mA) + (5.25V -.V)(3/32 x 4mA x ) =.W Thus, for a CERDIP package (θ JA = + C/W from Table 2), the maximum allowed ambient temperature T A is given by: T J(MA) = T A + PD x θ JA + 5 C = T A +.W x C/W where T A = +6.2 C. The T A limits for PDIP and SO Packages in the dissipation example above are C and C, respectively. Table 2. Package Thermal Resistance Data PACKAGE THERMAL RESISTANCE (θ JA ) 24 Narrow DIP +75 C/W 24 Wide SO +5 C/W 24 CERDIP + C/W Maximum Junction Temperature (T J ) = +5 C Maximum Ambient Temperature (T A ) = +5 C Cascading Drivers The example in Figure 3 drives 6 digits using a 3-wire µp interface. If the number of digits is not a multiple of, set both drivers scan limits registers to the same number so one display will not appear brighter than the other. For example, if 2 digits are need, use 6 digits per display with both scan-limit registers set for 6 digits so that both displays have a /6 duty cycle per digit. If 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 second display will appear brighter because its duty cycle per digit will be /5 while the first display s will be /6. Refer to the No-Op Register section for additional information. MA729/MA722

17 Serially Interfaced, -Digit LED Display Drivers MA729/MA722 N5524B 5.6V ±5% AND237SLC ANODE DP ANODE A ANODE F AND237SLC ANODE DP ANODE A ANODE F 6 ANODE B ANODE B ANODE G ANODE G 4 ANODE C ANODE C 2 ANODE E ANODE E ANODE D CATHODE 3 ANODE D CATHODE DATA IN LOAD (CS) CLOCK SEG D SEG E SEG C SEG G SEG B SEG F SEG A SEG DP GND GND DIN LOAD (CS) CLK MA729 MA722 V+ I SFT DIG DIG 9 * 2 3kΩ 4 * V 4.7kΩ.µF 4.7kΩ 6 NC COM NC2 IN MA394 IN2 COM2 NO NO2 3 IRF54 5 *4.7kΩ PULLUP REQUIRED FOR MA722 ( ) MA722 ONLY -5V IRF54 Figure 2. MA729/MA722 Driving 2.3in Displays 2

18 Serially Interfaced, -Digit LED Display Drivers DATA IN DIN DIG DIG 4 GND DIG 6 DIG 2 DIG 3 DIG 7 GND DOUT SEG D SEG DP SEG E SEG C V+ ISET SEG G SEG B 9.53kΩ 5V.µF DIN DIG DIG 4 GND DIG 6 DIG 2 DIG 3 DIG 7 GND DOUT SEG D SEG DP SEG E SEG C V+ ISET SEG G SEG B 9.53kΩ 5V.µF MA729/MA722 LOAD DATA ( ) MA722 ONLY CLOCK DIG 5 DIG LOAD (CS) SEG F SEG A CLK MA729 MA722 DIG 5 DIG LOAD (CS) SEG F SEG A CLK MA729 MA722 Figure 3. Cascading MA729/MA722s to Drive 6 Seven-Segment LED Digits 3

19 Serially Interfaced, -Digit LED Display Drivers MA729/MA722 Ordering Information (continued) PART TEMP RANGE PIN-PACKAGE MA722CNG MA722CWG MA722C/D C to +7 C C to +7 C C to +7 C 24 Narrow Plastic DIP 24 Wide SO Dice* MA722ENG -4 C to +5 C 24 Narrow Plastic DIP MA722EWG MA722ERG -4 C to +5 C -4 C to +5 C 24 Wide SO 24 Narrow CERDIP *Dice are specified at T A = +25 C. DIG 5 DIG LOAD OR CS CLK SEG A GND DIG 7 DIG 3 DIG 2 DIG 6 Chip Topography GND DIG 4 DIG.93" DIN (2.36mm) DOUT SEG D SEG F SEG B SEG G ISET SEG C SEG DP SEG E." (2.3mm) TRANSISTOR COUNT: 5267 SUBSTRATE CONNECTED TO GND 4

20 Serially Interfaced, -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 N TOP VIEW D E H INCHES MILLIMETERS DIM A A MIN.93.4 MA.4.2 MIN MA B C e.5.27 E H L VARIATIONS: DIM D D D INCHES MILLIMETERS MIN MA MIN MA N MS AA AB AC D AD D AE SOICW.EPS MA729/MA722 A C e B A - FRONT VIEW L SIDE VIEW PROPRIETARY INFORMATION TITLE: PACKAGE OUTLINE,.3" SOIC APPROVAL DOCUMENT CONTROL NO. REV B 5

21 Serially Interfaced, -Digit LED Display Drivers MA729/MA722 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 PDIPN.EPS MA729/MA722 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. 6 Maxim Integrated Products, 2 San Gabriel Drive, Sunnyvale, CA 946 (4) Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

22 承认书 SPECIFCATION 客户资料 CUSTOMER S INFORMATION 产品名称 LED 数码管 PRODUCTION NAME: 产品型号 :LD7BS-SS22 PRODCTION TYPE: 规格摘要 : TYPE: 红光 7 点阵管 机型 : MODEL NO: 料号 : PART NO: 日期 :2--25 DATE: 承办人 : ISSUEDER: 结论 RESULT 客户确认 APPROVED BY 签名 SIGN: 日期 DATE: 确认后请回传 PLEASE RETURN BY ONE COPY 型号 PART NO LD7BS-SS22 2 说明 Description 发光颜色 Emitted Color 红光 外观颜色 Lens Color 黑 白两色 外形尺寸 Max Size 2.*2.*5.9 页共 3 页

23 极限参数 Absolute Maximum Ratings 建议使用驱动检测 参数 Parameter 单位 Symbol 极限值 Maximum Rating 单位 Unit 功耗 Power Dissipation Pd mw 脉冲电流 Peak Forward Current Ifp 5 ma 直流电流 Forward )Current Continuous Forward Current Ifm 2 ma 反向电压 Reverse Voltage VR 5 V 工作温度 Operating Temperature Range Topr 储藏温度 Storage Temperature Range Tstg -4 + 静电电压 Static Voltage Var V * 焊接温度 Lead Sodering Temperature 26 for 3 seconds * 当工作温度高于 25 时,Ifm,Ifp 和 Id 必须降低 ; 电流降低率是 -.36mA/ 直流驱动 ), 或 -.6mA/ 脉冲驱动 功耗降低率是 -.75mW/ 产品的工作电流不能大于对应工作温度条件 Ifm 或 Ifp 的 6% For operationabove 25, The Ifm Ifp & Pd must be derated, the Curent derating is.36ma/ for DC driveand -.6mA/ for Pulse drive, the power dissipation is -.75mW/.The product working current must not more than the 6% of the Ifm or Ifp according to the working temperature. 光电特性 Optical-Electrical Characteristic 建议使用驱动检测 参数 Parameter 测试条件 Test CONDITING 单位 Symbol Min Type Max 单位 Unit 发光强度 Luminous Intensity IF=mA Iv Mcd 正向电压 Forward Voltage IF=mA VF V 反向电流 REVERSE Current VR = 5V IR - 2 ua 波长 Peak Wavelength IF=mA nm 带宽 Spectral Bandwidth IF=mA λ nm 查看角度 View Angle IF=mA 2θ/2 - - Deg. 3. 结构尺寸 Mechanical Outline : ( 未注尺寸公差 Unspecified Tolerances is: ±.2 发光颜色 红色 COLOR 2 页共 3 页

24 . 电路图 Circuit Diagram : 5. 保存和焊接条件 Storage & Soldering Condions : Store with care. Storing the units in bad condition 注意保存, 保存条件不好时, 会降低膜片 will cause the reflector sheet and decrease it s 与反射壳 导光板 的粘附力 adhesive power. Storage the products under the 推荐保存条件为 温度 25 ± condition :temperature ( 25 ± ) and humidity 湿度 65 CRH±2 CRH (65 CRH±2 CRH) our recommendation. The Soldering Temperature is 26±5 and Soldering 焊接温度 26 ±5, 焊接时间小于 3 秒, Time should be less than 3 sec, and soldering iron 烙铁功率小于 3W power should be less than 3W. The soldering point should be farther than.6mm 焊接点应离产品实体大于.6mm from boby. 3 页共 3 页