|Category||Power Management => Lighting Controllers|
|Description||4-Wire Interfaced, 2.7V To 5.5V LED Display Driver With I/O Expander And Key Scan
The MAX6954 is a compact display driver that interfaces microprocessors to a mix of 7-segment, 14-segment, and 16-segment LED displays through an SPI™- or QSPI™-compatible 4-wire serial interface. The serial interface may be cascaded through multiple devices. The MAX6954 drives up to 16 digits 7-segment, 8 digits 14-segment, 8 digits 16-segment, or 128 discrete LEDs, while functioning from a supply voltage as low as 2.7V. The driver includes five I/O expander (or GPIO) lines, some or all or which may be configured as a key-switch reader, which automatically scans and debounces a matrix of up to 32 switches.
Included on chip are full 14- and 16-segment ASCII 104-character fonts, a hexadecimal font for 7-segment displays, multiplex scan circuitry, anode and cathode drivers, and static RAM that stores each digit. The maximum segment current for the display digits is set using a single external resistor. Digit intensity can be independently adjusted using the 16-step internal digital brightness control. The MAX6954 includes a low-power shutdown mode, a scan-limit register that allows the user to display from 1 to 16 digits, segment blinking (synchronized across multiple drivers, if desired), and a test mode, which forces all LEDs on. The LED drivers are slew-rate limited to reduce EMI.
For a 2-wire interfaced version, refer to the MAX6955 data sheet. An evaluation kit (EV kit) for the MAX6955 is available.
|Company||Maxim Integrated Products|
|Datasheet||Download MAX6954 datasheet
4-Wire Interfaced, to 5.5V LED Display Driver with I/O Expander and Key Scan
The is a compact display driver that interfaces microprocessors to a mix 7-segment, 14-segment, and 16-segment LED displays through an SPITMor QSPITM-compatible 4-wire serial interface. The serial interface may be cascaded through multiple devices. The MAX6954 drives to 16 digits 7-segment, 8 digits 14-segment, 8 digits or 128 discrete LEDs, while functioning from a supply voltage as low as 2.7V. The driver includes five I/O expander (or GPIO) lines, some or all or which may be configured as a keyswitch reader, which automatically scans and debounces a matrix to 32 switches. Included on chip are full 14- and 16-segment ASCII 104-character fonts, a hexadecimal font for 7-segment displays, multiplex scan circuitry, anode and cathode drivers, and static RAM that stores each digit. The maximum segment current for the display digits is set using a single external resistor. Digit intensity can be independently adjusted using the 16-step internal digital brightness control. The MAX6954 includes a low-power shutdown mode, a scan-limit register that allows the user to display from to 16 digits, segment blinking (synchronized across multiple drivers, if desired), and a test mode, which forces all LEDs on. The LED drivers are slew-rate limited to reduce EMI. For a 2-wire interfaced version, refer to the MAX6955 data sheet. An evaluation kit (EV kit) for the MAX6955 is available. to 5.5V Operation Drives to 16 Digits 7-Segment, 8 Digits 14-Segment, 8 Digits 16-Segment, 128 Discrete LEDs, or a Combination of Digit Types Drives Common-Cathode Monocolor and Bicolor LED Displays Built-In ASCII 104-Character Font for 14-Segment and 16-Segment Digits and Hexadecimal Font for 7-Segment Digits Automatic Blinking Control for each Segment 10µA (typ) Low-Power Shutdown (Data Retained) 16-Step Digit-by-Digit Digital Brightness Control Display Blanked on Power-Up Slew-Rate Limited Segment Drivers for Lower EMI Five GPIO Port Pins Can Be Configured as KeySwitch Reader to Scan and Debounce to 32 Switches with n-Key Rollover IRQ Output when a Key Input Is Debounced 36-Pin SSOP and 40-Pin DIP and TQFN Packages Automotive Temperature Range StandardFeatures
Set-Top Boxes Panel Meters White Goods Automotive Bar Graph Displays Audio/Video Equipment
GPIO AND KEY-SCAN CONTROL PWM BRIGHTNESS CONTROL DIGIT MULTIPLEXER TO P4
PART MAX6954APL MAX6954ATL+ TEMP RANGE to +125°C PIN-PACKAGE 36 SSOP 40 PDIP 40 TQFN-EP*
+Denotes a lead-free/RoHS-compliant package. *EP = Exposed pad. Pin Configurations and Typical Operating Circuits appear at end of data sheet.
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 Direct 1-888-629-4642, or visit Maxim's website at www.maxim-ic.com.4-Wire Interfaced, to 5.5V LED Display Driver with I/O Expander and Key Scan MAX6954
(Voltage with respect to GND.) to +6V All Other Pins............................................-0.3V to (V+ + 0.3V) Current O0O7 Sink Current......................................................935mA O0O18 Source Current.................................................55mA DIN, CLK, CS, OSC, DOUT, BLINK, OSC_OUT, P4...........................................................40mA GND.....................................................................................1A Continuous Power Dissipation (TA +70°C) 36-Pin SSOP (derate at 11.8mW/°C above +70°C).....941mW 40-Pin PDIP (derate at 16.7mW/°C above +70°C).....1333mW 40-Pin TQFN (derate at 37mW/°C above +70°C)......2963mW Operating Temperature Range (TMIN to +125°C Junction Temperature......................................................+150°C Storage Temperature to +150°C Lead Temperature (soldering, 10s).................................+300°C
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.(Typical Operating Circuits, TA = TMIN to TMAX, unless otherwise noted.) (Note 1)
PARAMETER Operating Supply Voltage SYMBOL V+ Shutdown mode, all digital inputs V+ or GND All segments on, all digits scanned, intensity set to full, internal oscillator, DOUT open circuit, no display or OSC_OUT load connected TA = TMIN to TMAX CONDITIONS MIN 2.7 10 TYP MAX µA 40 UNITS V
Master Clock Frequency Dead Clock Protection Frequency OSC Internal/External Detection Threshold OSC High Time OSC Low Time Slow Segment Blink Period Fast Segment Blink Period Fast or Slow Segment Blink Duty Cycle
OSC = RC oscillator, RSET = 56k, fSLOWBLINK C SET = 3.3V fFASTBLINK OSC = RC oscillator, RSET = 56k, CSET = 3.3V4-Wire Interfaced, to 5.5V LED Display Driver with I/O Expander and Key Scan
(Typical Operating Circuits, TA = TMIN to TMAX, unless otherwise noted.) (Note 1)
PARAMETER Segment Drive Source Current Segment Current Slew Rate Segment Drive Current Matching LOGIC INPUTS AND OUTPUTS Input Leakage Current DIN, CLK, CS, OSC, P4 4-Wire Logic-High Input Voltage DIN, CLK, CS 4-Wire Logic-Low Input Voltage DIN, CLK, CS Port Logic-High Input Voltage P3, P4 Port Logic-Low Input Voltage P3, P4 Port Hysteresis Voltage P3, P4 Port Input Pullup Current from V+ Port Output Low Voltage Blink Output Low Voltage DOUT Output High Voltage DOUT Output Low Voltage OSC_OUT Output High Voltage OSC_OUT Output Low Voltage IIH, IIL +1 µA SYMBOL ISEG ISEG/t ISEG VLED = 3.3V CONDITIONS = +25°C MIN -34.5 TYP MAX -46.5 UNITS mA mA/µs %
VIHSPI VILSPI VIHP VILP VIP IIPU VOLP VOLBK VOHDO VOLDO VOHOSC VOLOSC to P3 configured as keyscan input, = 3.3V ISINK = 8mA ISINK = 0.6mA ISOURCE = 1.6mA ISINK = 1.6mA ISOURCE = 1.6mA ISINK = 1.6mA
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