MAX6954

Features:

High-Speed 26MHz SPI/QSPI/MICROWIRE^(TM)-Compatible Serial Interface 
2.7V to 5.5V Operation   
Drives Up 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
10A (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 Key-
Switch Reader to Scan and Debounce Up to 32
Switches with n-Key Rollover
IRQ Output when a Key Input Is Debounced
36-Pin SSOP and 40-Pin DIP Packages
Automotive Temperature Range Standard 


Application

Set-Top Boxes Automotive
Panel Meters Bar Graph Displays
White Goods                           Audio/Video Equipment


Pinout




Specifications

Voltage (with Respect to GND)
    V+.........................................................................-0.3V 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, ISET............20mA
    P0, P1, P2, P3, 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
Operating Temperature Range
    (TMIN to TMAX).............................................-40°C to +125°C
Junction Temperature ......................................................+150°C
Storage Temperature Range............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C


Description

The MAX6954 is a compact display driver that inter- faces microprocessors to a mix of 7-segment, 14-seg- ment, and 16-segment LED displays through an SPI^(TM)- or QSPI^(TM)-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 MAX6954 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 max- imum segment current of MAX6954 for the display digits is set using a single external resistor. Digit intensity can be inde- pendently 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 MAX6954 are slew-rate limited to reduce EMI.