MAX6954 Maxim, MAX6954 Datasheet
MAX6954
Manufacturer Part Number
MAX6954
Description
4-Wire Interfaced / 2.7V to 5.5V LED Display Driver with I/O Expander and Key Scan
Manufacturer
Maxim
Datasheet
1.MAX6954.pdf
(38 pages)
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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™-
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 max-
imum segment current 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
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.
*Future product—contact factory for availability.
19-2460; Rev 1; 10/02
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/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
MAX6954AAX
MAX6954APL
Set-Top Boxes
Panel Meters
White Goods
PART
4-Wire Interfaced, 2.7V to 5.5V LED Display
________________________________________________________________ Maxim Integrated Products
-40°C to +125°C
-40°C to +125°C
TEMP RANGE
Driver with I/O Expander and Key Scan
Ordering Information
General Description
Automotive
Bar Graph Displays
Audio/Video Equipment
Applications
PIN-PACKAGE
36 SSOP
40 PDIP
High-Speed 26MHz SPI/QSPI/MICROWIRE™-
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
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 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
OSC_OUT
BLINK
DOUT
ISET
OSC
CLK
DIN
CS
NETWORK
COUNTER
DIVIDER/
CURRENT
SOURCE
CONTROL
BLINK
RAM
4-WIRE SERIAL INTERFACE
MAX6954
Functional Diagram
AND KEY-SCAN
MULTIPLEXER
BRIGHTNESS
CONTROL
CONTROL
DIGIT
PWM
GPIO
CONFIGURATION
CHARACTER
GENERATOR
REGISTER
ROM
DRIVERS
LED
Features
P0 TO P4
O0 TO O23
1
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