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MAX6954AAX+

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P30P31-P33P34-P36P37-P39
General 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™-
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 of 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.
Applications
Set-Top Boxes Automotive
Panel Meters Bar Graph Displays
White Goods Audio/Video Equipment
Features
♦ 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 and TQFN Packages
♦ Automotive Temperature Range Standard
MAX6954
4-Wire Interfaced, 2.7V to 5.5V LED Display
Driver with I/O Expander and Key Scan
________________________________________________________________
Maxim Integrated Products
1
Ordering Information
19-2460; Rev 4; 3/09
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
PART TEMP RANGE PIN-PACKAGE
MAX6954AAX -40°C to +125°C 36 SSOP
MAX6954APL -40°C to +125°C 40 PDIP
MAX6954ATL+
-40°C to +125°C 40 TQFN-EP*
SPI and QSPI are trademarks of Motorola, Inc.
MICROWIRE is a trademark of National Semiconductor Corp.
+
Denotes a lead-free/RoHS-compliant package.
*
EP = Exposed pad.
Pin Configurations and Typical Operating Circuits appear
at end of data sheet.
ISET
OSC
OSC_OUT
BLINK
CLK
CS
DIN
DOUT
4-WIRE SERIAL INTERFACE
RAM
BLINK
CONTROL
CONFIGURATION
REGISTER
CHARACTER
GENERATOR
ROM
CURRENT
SOURCE
DIVIDER/
COUNTER
NETWORK
DIGIT
MULTIPLEXER
PWM
BRIGHTNESS
CONTROL
GPIO
AND KEY-SCAN
CONTROL
LED
DRIVERS
O0 TO O23
P0 TO P4
MAX6954
Functional Diagram
MAX6954
4-Wire Interfaced, 2.7V to 5.5V LED Display
Driver with I/O Expander and Key Scan
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
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.
(Voltage with respect to GND.)
V+ .........................................................................-0.3V to +6V
All Other Pins............................................-0.3V to (V+ + 0.3V)
Current
O0–O7 Sink Current ......................................................935mA
O0–O18 Source Current .................................................55mA
DIN, CLK, CS, OSC, DOUT, BLINK, OSC_OUT, ISET ....20mA
P0, P1, P2, P3, P4 ...........................................................40mA
GND .....................................................................................1A
Continuous Power Dissipation (T
A
= +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
(T
MIN
to T
MAX
) ...............................................-40°C to +125°C
Junction Temperature......................................................+150°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
DC ELECTRICAL CHARACTERISTICS
(
Typical Operating Circuits
, V+ = 2.7V to 5.5V, T
A
= T
MIN
to T
MAX
, unless otherwise noted.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX
UNITS
Operating Supply Voltage V+ 2.7 5.5 V
T
A
= +25°C 10 35
Shutdown Supply Current I
SHDN
Shutdown mode, all
digital inputs at V+
or GND
T
A
= T
MIN
to T
MAX
40
µA
T
A
= +25°C 22 30
Operating Supply Current I+
All segments on, all
digits scanned,
intensity set to full,
internal oscillator,
DOUT open circuit,
no display or
OSC_OUT load
connected
T
A
= T
MIN
to T
MAX
35
mA
OSC = RC oscillator, R
SET
= 56kΩ,
C
SET
= 22pF, V+ = 3.3V
4
Master Clock Frequency f
OSC
OSC driven externally 1 8
MHz
Dead Clock Protection Frequency
f
OSC
95 kHz
OSC Internal/External Detection
Threshold
V
OSC
1.7 V
OSC High Time t
CH
50 ns
OSC Low Time t
CL
50 ns
Slow Segment Blink Period
f
SLOWBLINK
OSC = RC oscillator, R
SET
= 56kΩ,
C
SET
= 22pF, V+ = 3.3V
1s
Fast Segment Blink Period
f
FASTBLINK
OSC = RC oscillator, R
SET
= 56kΩ,
C
SET
= 22pF, V+ = 3.3V
0.5 s
Fast or Slow Segment Blink Duty
Cycle
49.5 50.5
%
MAX6954
4-Wire Interfaced, 2.7V to 5.5V LED Display
Driver with I/O Expander and Key Scan
_______________________________________________________________________________________ 3
DC ELECTRICAL CHARACTERISTICS (continued)
(
Typical Operating Circuits
, V+ = 2.7V to 5.5V, T
A
= T
MIN
to T
MAX
, unless otherwise noted.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
Segment Drive Source Current I
SEG
V
LED
= 2.2V,
V+
= 3.3V
T
A
= +25°C
-34.5
-40
-46.5
mA
Segment Current Slew Rate
ΔI
SEG
/Δt
T
A
= +25°C, V+ = 3.3V 11
mA/µs
Segment Drive Current Matching
ΔI
SEG
T
A
= +25°C, V+ = 3.3V 5 10 %
LOGIC INPUTS AND OUTPUTS
Input Leakage Current
DIN, CLK, CS, OSC, P0, P1, P2,
P3, P4
I
IH
, I
IL
-1 +1 µA
4-Wire Logic-High Input Voltage
DIN, CLK, CS
V
IHSPI
1.8 V
4-Wire Logic-Low Input Voltage
DIN, CLK, CS
V
ILSPI
0.6 V
Port Logic-High Input Voltage
P0, P1, P2, P3, P4
V
IHP
0.7 x
V+
V
Port Logic-Low Input Voltage
P0, P1, P2, P3, P4
V
ILP
0.3 x
V+
V
Port Hysteresis Voltage P0, P1,
P2, P3, P4
ΔV
IP
0.03 x
V+
V
Port Input Pullup Current from V+
I
IPU
P0 to P3 configured as keyscan input, V+ =
3.3V
75 µA
Port Output Low Voltage V
OLP
I
SINK
= 8mA 0.3 0.5 V
Blink Output Low Voltage V
OLBK
I
SINK
= 0.6mA 0.1 0.3 V
DOUT Output High Voltage
V
OHDO
I
SOURCE
= 1.6mA
V+ -
0.2
V
DOUT Output Low Voltage
V
OLDO
I
SINK
= 1.6mA 0.2 V
OSC_OUT Output High Voltage
V
OHOSC
I
SOURCE
= 1.6mA
V+ -
0.4
V
OSC_OUT Output Low Voltage
V
OLOSC
I
SINK
= 1.6mA 0.4 V
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P30P31-P33P34-P36P37-P39

MAX6954AAX+

Mfr. #:
Buy MAX6954AAX+
Manufacturer:
Maxim Integrated
Description:
LED Display Drivers 2.7-5.5V LED Display Driver
Lifecycle:
New from this manufacturer.
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