MAX6958/MAX6959 19-2634 Rev 1 11/05 2-Wire Interfaced, 3V to 5.5V, 4-Digit, 9-Segment LED Display Drivers with Keyscan General Description Features 400kbps 2-Wire Serial Interface The MAX6958/MAX6959 compact multiplexed com- mon-cathode display drivers interface microprocessors 3V to 5.5V Operation to seven-segment numeric LED digits, or discrete LEDs Drive 4 Digits plus 4 or 8 Discrete LEDs 2 through an SMBus- and I C-compatible 2-wire serial Drive Common-Cathode LED Digits interface. The 2-wire serial interface uses fixed 23mA Constant-Current LED Segment Drive 0.8V/2.1V logic thresholds for compatibility with 2.5V and 3.3V systems when the display driver is powered Hexadecimal Decode/No-Decode Digit Selection from a 5V supply. 64-Step Digital Brightness Control The MAX6958/MAX6959 drive up to four 7-segment Slew-Rate-Limited Segment Drivers Reduced EMI digits, with decimal points, plus four discrete LEDs, or Debounces Up to Eight Switches with n-Key four 7-segment digits and eight discrete LEDs if the Rollover (MAX6959 Only) digits decimal points are not used, or up to 36 discrete IRQ Output When a Key Input Is Debounced LEDs. The MAX6959 also includes two input ports, one (MAX6959 Only) or both of which may be configured as a key-switch reader, which automatically scans and debounces a 20A Low-Power Shutdown (Data Retained) matrix of up to eight switches. Key-switch status is Automotive Temperature Range (-40C to +125C) obtained by polling internal status registers or by con- Compact 16-Pin PDIP and QSOP Packages figuring the MAX6959 interrupt output. Other on-chip features include a hexadecimal font for Ordering Information seven-segment displays, multiplex scan circuitry, TEMP SLAVE PIN- PKG anode and cathode drivers, and static RAM that stores PART RANGE ADDRESS PACKAGE CODE each digit. The peak segment current for the display digits is set internally to 23mA. Display intensity is -40C to MAX6958AAEE 0111000 16 QSOP E 16-1 adjusted using a 64-step internal digital brightness con- +125C trol. The MAX6958/MAX6959 include a low-power shut- -40C to down mode, a scan-limit register that allows the user to MAX6958AAPE 0111000 16 DIP P16-1 +125C display from one to four digits, and a test mode, which Ordering Information continued at end of data sheet. forces all LEDs on. The LED drivers are slew-rate-limit- ed to reduce EMI. Typical Operating Circuit The MAX6958/MAX6959 are available in 16-pin PDIP and QSOP packages and are fully specified over the -40C to +125C automotive temperature range. 8 8 8 8 C DIG0DIG3 8 SDA SDA Applications SEG0SEG8 SCL 5V SCL Set-Top Boxes IRQ V+ Audio/Video Equipment IRQ/SEG9 Panel Meters MAX6959 Vending Machines INPUT1 INPUT2 White Goods GND Industrial Controls Key0 DIG0/SEG0 Key1 DIG1/SEG1 Key2 DIG2/SEG2 Key3 DIG3/SEG3 Key4 Pin Configuration, Functional Diagram, and Typical DIG4/SEG4 Application Circuit appear at end of data sheet. Key5 DIG5/SEG5 Key6 DIG6/SEG6 Key7 DIG7/SEG7 SMBus is a trademark of Intel Corp. Maxim Integrated Products 1 For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct at 1-888-629-4642, or visit Maxims website at www.maxim-ic.com.2-Wire Interfaced, 3V to 5.5V, 4-Digit, 9-Segment LED Display Drivers with Keyscan ABSOLUTE MAXIMUM RATINGS (Voltage with respect to GND.) Continuous Power Dissipation (T = +70C) A V+, SCL, SDA.......................................................-0.3V to +6V 16-Pin QSOP (derate at 8.34mW/C above +70C).....667mW All Other Pins............................................-0.3V to (V+ + 0.3V) 16-Pin DIP (derate at 10.5mW/C above +70C).........842mW Current Operating Temperature Range DIG0/SEG0DIG3/SEG3 Sink Current ..........................275mA MAX695 (T to T ) ...............................-40C to +125C MIN MAX DIG0/SEG0SEG9 Source Current .................................30mA Junction Temperature......................................................+150C SCL, SDA, INPUT1, INPUT2 ...........................................20mA Storage Temperature Range .............................-65C to +150C Lead Temperature (soldering, 10s) .................................+300C 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. DC ELECTRICAL CHARACTERISTICS (V+ = 3V to 5.5V, T = T to T , unless otherwise noted. Typical values are at V+ = 5V, T = +25C.) (Note 1) A MIN MAX A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Operating Supply Voltage V+ 3 5.5 V T = +25C 20 50 Shutdown mode, all A Shutdown Supply Current I A SHDN digital inputs at V+ T = T to +85C 125 A MIN T = +25C 5.9 6.7 Intensity set to full, A no display load Operating Supply Current I+ connected, INPUT1 mA T = T to T 7.5 A MIN MAX and INPUT2 open circuit Display Scan Rate f 4 digits scanned T = T to T 510 780 1050 Hz SCAN A MIN MAX Keyscan Debounce Time t T = T to T 30.3 41 63 ms DEBOUNCE A MIN MAX T = +25C -19 -23 -29 V = 2.4V, A LED V+ = 4.5V to 5.5V T = T to T -18 -30 A MIN MAX Segment Drive Source Current I mA SEG T = +25C -16 -29.5 V = 2V, A LED V+ = 3V to 5.5V T = T to T -15.5 -30.5 A MIN MAX Segment Current Slew Rate I / t 11 mA/s SEG Segment Drive Current Matching I 4% SEG LOGIC INPUTS AND OUTPUTS Input Leakage Current SCL I , I -1 +1 A IH IL and SDA Logic High Input Voltage SCL, V 2.1 V IH SDA Logic Low Input Voltage SCL, V 0.8 V IL SDA Input Leakage Current INPUT1, I , I INPUT = V+ -1 +1 A INH INL INPUT2 Logic High Input Voltage INPUT1, 0.7 V V INH INPUT2 V+ Logic Low Input Voltage INPUT1, 0.3 V V INL INPUT2 V+ 2 MAX6958/MAX6959