19-2312; Rev 3; 3/04
2-Wire Interfaced, 2.7V to 5.5V, 4-Digit 5
✕
7
Matrix LED Display Driver
General Description
The MAX6953 is a compact cathode-row display driver
that interfaces microprocessors to 5
✕
7 dot-matrix LED
displays through an I
2
C™-compatible serial interface.
The MAX6953 drives up to four digits (140 LEDs).
Included on-chip are an ASCII 104-character font, mul-
tiplex scan circuitry, column and row drivers, and static
RAM that stores each digit, as well as font data for 24
user-definable characters. The segment current for the
LEDs is set by an internal digit-by-digit digital bright-
ness control.
The device includes a low-power shutdown mode, seg-
ment blinking (synchronized across multiple drivers, if
desired), and a test mode that forces all LEDs on. The
LED drivers are slew-rate limited to reduce EMI.
For an SPI™-compatible version, refer to the MAX6952
data sheet. An EV kit is available for the MAX6952.
♦
2.7V to 5.5V Operation
♦
Drives 4 Monocolor or 2 Bicolor Cathode-Row
5
✕
7 Matrix Displays
♦
Built-In ASCII 104-Character Font
♦
24 User-Definable Characters Available
♦
Automatic Blinking Control for Each Segment
♦
70µA Low-Power Shutdown (Data Retained)
♦
16-Step Digital Brightness Control
♦
Display Blanked on Power-Up
♦
Slew-Rate-Limited Segment Drivers for Lower EMI
♦
36-Pin SSOP and 40-Pin DIP Packages
♦
Extended Temperature Range as Standard
Features
♦
400kbps 2-Wire Interface Compatible with I
2
C
MAX6953
Applications
Message Boards
Medical Equipment
Industrial Displays
Audio/Video Equipment
Gaming Machines
PART
MAX6953EAX
MAX6953EPL
Ordering Information
TEMP RANGE
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
36 SSOP
40 PDIP
Pin Configurations appear at end of data sheet.
Typical Application Circuit
DIGIT 0
DIGIT 1
O19
O20
O21
O22
O23
O0
O1
O2
O3
O4
O5
O6
C1
C2
C3
C4
C5
3.3V
V+
V+
V+
100nF
47µF
GND
GND
GND
3.3V
MAX6953
4.7kΩ
4.7kΩ
4.7kΩ
SCL
SDA
BLINK
AD1
AD0
OSC
ISET
O0
O1
O2
O3
O4
O5
O6
O7
O8
O9
O10
O11
O12
O13
O14
O15
O16
O17
O18
O19
O20
O21
O22
O23
O14
O15
O16
O17
O18
O0
O1
O2
O3
O4
O5
O6
C1
C2
C3
C4
C5
R1
R2
R3
R4
R5
R6
R7
R1
R2
R3
R4
R5
R6
R7
DIGIT 2
O14
O15
O16
O17
O18
O7
O8
O9
O10
O11
O12
O13
C1
C2
C3
C4
C5
O19
O20
O21
O22
O23
O7
O8
O9
O10
O11
O12
O13
DIGIT 3
C1
C2
C3
C4
C5
R1
R2
R3
R4
R5
R6
R7
R1
R2
R3
R4
R5
R6
R7
26pF
C
SET
53.6kΩ
R
SET
I
2
C is a trademark of Philips Corp.
SPI is a trademark of Motorola, Inc.
________________________________________________________________
Maxim Integrated Products
1
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.
2-Wire Interfaced, 2.7V to 5.5V, 4-Digit 5
Matrix LED Display Driver
MAX6953
ABSOLUTE MAXIMUM RATINGS
Voltage (with Respect to GND)
V+ .............................................................................-0.3V to +6V
All Other Pins................................................-0.3V to (V+ + 0.3V)
O0–O13 Sink Current ....................................................... 500mA
O14–O23 Source Current .................................................. 50mA
Continuous Power Dissipation (T
A
= +70°C)
36-Pin SSOP (derate 11.8mW/°C above +70°C) .....941.2mW
40-Pin PDIP (derate 16.7mW/°C above +70°C)........1333mW
✕
7
Operating Temperature Range
MAX6953E ......................................................-40°C to +85°C
Junction Temperature ......................................................+150°C
Storage Temperature Range .............................-65°C 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.
DC ELECTRICAL CHARACTERISTICS
(Typical operating circuit, V+ = 3.0V to 5.5V, T
A
= T
MIN
to T
MAX
, unless otherwise noted.) (Note 1)
PARAMETER
Operating Supply Voltage
Shutdown Supply Current
SYMBOL
V+
I
SHDN
Shutdown mode, all
digital inputs at V+
or GND
T
A
= T
MIN
to T
MAX
T
A
= +25°C
70
CONDITIONS
MIN
2.7
TYP
MAX
5.5
130
µA
100
UNITS
V
Operating Supply Current
Master Clock Frequency
(OSC Internal Oscillator)
Master Clock Frequency
(OSC External Clock)
Dead Clock Protection
Frequency
OSC Internal/External Detection
Threshold
OSC High Time
OSC Low Time
Slow Segment Blink Period
(OSC Internal Oscillator)
Fast Segment Blink Period
(OSC Internal Oscillator)
Fast or Slow Segment Blink
Duty Cycle (Note 2)
Column Drive Source Current
I+
All segments on, intensity set to full,
internal oscillator, no display load
connected, BLINK open circuit
OSC = RC oscillator, R
SET
= 53.6kΩ,
C
SET
= 26pF
OSC overdriven externally
1
12
15
mA
f
OSC
f
OSC
f
OSC
V
OSC
t
CH
t
CL
f
SLOWBLINK
f
FASTBLINK
4
8
90
1.7
50
50
MHz
MHz
kHz
V
ns
ns
OSC = RC oscillator, R
SET
= 53.6kΩ,
C
SET
= 26pF
OSC = RC oscillator, R
SET
= 53.6kΩ,
C
SET
= 26pF
49.5
1
0.5
50.5
-58
s
s
%
mA
I
COLUMN
V
LED
= 2.4V, V+ = 3.0V, T
A
= +25
o
C
-32
2
_______________________________________________________________________________________
2-Wire Interfaced, 2.7V to 5.5V, 4-Digit 5
✕
7
Matrix LED Display Driver
DC ELECTRICAL CHARACTERISTICS (continued)
(Typical operating circuit, V+ = 3.0V to 5.5V, T
A
= T
MIN
to T
MAX
, unless otherwise noted.) (Note 1)
PARAMETER
Segment Current Slew Rate
Segment Drive Current
Matching (Within IC)
LOGIC INPUTS
Input High Voltage
SDA, SCL, AD0, AD1
Input Low Voltage
SDA, SCL, AD0, AD1
Input Hysteresis
SDA, SCL, AD0, AD1
Input Leakage Current
Input Capacitance
DIGITAL OUTPUT
SDA Output Low Voltage
BLINK Output Low Voltage
V
OLSDA
V
OLBK
I
SINK
= 4mA
I
SINK
= 1.6mA
0.4
0.4
V
V
V
IH
V
IL
V
HYST
I
IL
, I
IH
C
I
-2
10
0.05
✕
V+
2
0.7 x
V+
0.3
✕
V+
V
V
V
µA
pF
SYMBOL
∆I
SEG
/∆t
∆I
SEG
T
A
= +25
o
C
T
A
= +25°C
CONDITIONS
MIN
TYP
12.5
4
MAX
UNITS
mA/µs
%
MAX6953
MAX6953 TIMING CHARACTERISTICS
(V+ = 2.7V to 5.5V, T
A
= T
MIN
to T
MAX
, unless otherwise noted.) (Note 1)
PARAMETER
Serial Clock Frequency
Bus Free Time Between a STOP
and a START Condition
Hold Time (Repeated) START
Condition
Repeated START Condition
Setup Time
STOP Condition Setup Time
Data Hold Time
Data Setup Time
SCL Clock Low Period
SCL Clock High Period
Rise Time of Both SDA and SCL
Signals, Receiving
Fall Time of Both SDA and SCL
Signals, Receiving
SYMBOL
f
SCL
t
BUF
t
HD
,
STA
t
SU
,
STA
t
SU, STO
t
HD, DAT
t
SU, DAT
t
LOW
t
HIGH
t
R
t
F
(Notes 2, 4)
(Notes 2, 4)
(Note 3)
100
1.3
0.6
20 +
0.1C
B
20 +
0.1C
B
300
300
1.3
0.6
0.6
0.6
0.9
CONDITIONS
MIN
TYP
MAX
400
UNITS
kHz
µs
µs
µs
µs
µs
ns
µs
µs
ns
ns
_______________________________________________________________________________________
3
2-Wire Interfaced, 2.7V to 5.5V, 4-Digit 5
Matrix LED Display Driver
MAX6953
MAX6953 TIMING CHARACTERISTICS (continued)
(V+ = 2.7V to 5.5V, T
A
= T
MIN
to T
MAX
, unless otherwise noted.) (Note 1)
PARAMETER
Fall Time of SDA Transmitting
Pulse Width of Spike Suppressed
Capacitive Load for Each
Bus Line
SYMBOL
t
F
t
SP
C
B
(Notes 2, 5)
(Note 6)
(Note 2)
0
CONDITIONS
MIN
TYP
20 +
0.1C
B
50
400
✕
7
MAX
250
UNITS
ns
ns
pF
Note 1:
All parameters tested at T
A
= +25°C. Specifications over temperature are guaranteed by design.
Note 2:
Guaranteed by design.
Note 3:
A master device must provide a hold time of at least 300ns for the SDA signal (referred to V
IL
of the SCL signal) in order to
bridge the undefined region of SCL’s falling edge.
Note 4:
C
B
= total capacitance of one bus line in pF. t
R
and t
F
measured between 0.3V+ and 0.7V+.
Note 5:
I
SINK
≤
6mA. C
B
= total capacitance of one bus line in pF. t
R
and t
F
measured between 0.3V+ and 0.7V+.
Note 6:
Input filters on the SDA and SCL inputs suppress noise spikes less than 50ns.
Typical Operating Characteristics
(Typical application circuit, V+ = 3.3V, LED forward voltage = 2.4V, scan limit set to 4 digits, T
A
= +25°C, unless otherwise noted.)
INTERNAL OSCILLATOR
FREQUENCY vs. TEMPERATURE
MAX6953 toc01
INTERNAL OSCILLATOR FREQUENCY
vs. SUPPLY VOLTAGE
MAX6953 toc02
INTERNAL OSCILLATOR
WAVEFORM AT OSC (PIN 19 OR 21)
MAX6953 toc03
4.30
OSCILLATOR FREQUENCY (MHz)
V+ = 2.7V
4.4
OSCILLATOR FREQUENCY (MHz)
4.3
4.2
4.1
4.0
3.9
3.8
2.5
4.20
2.0
VOLTAGE AT OSC (V)
4.10
V+ = 3.3V
4.00
V+ = 5V
3.90
1.5
1.0
0.5
3.7
3.80
-40
-20
0
20
40
60
80
TEMPERATURE (°C)
3.6
2.5
3.5
4.5
5.5
SUPPLY VOLTAGE (V)
0
0
200
400
TIMELINE (ns)
600
800
4
_______________________________________________________________________________________
2-Wire Interfaced, 2.7V to 5.5V, 4-Digit 5
✕
7
Matrix LED Display Driver
MAX6953
Typical Operating Characteristics (continued)
(Typical application circuit, V+ = 3.3V, LED forward voltage = 2.4V, scan limit set to 4 digits, T
A
= +25°C, unless otherwise noted.)
DEAD CLOCK OSCILLATOR FREQUENCY
vs. SUPPLY VOLTAGE
MAX6953 toc04
OUTPUT SOURCE CURRENT
vs. SUPPLY VOLTAGE
MAX6953 toc05
WAVEFORMS AT O2 (PIN 3) AND O14
(PIN 28) V+ = 3.3V, 8/16 INTENSITY
MAX6953 toc06
105
OSCILLATOR FREQUENCY (kHz)
1.01
CURRENT NORMALIZED TO 40mA
1.00
0.99
0.98
0.97
0.96
0.95
100
95
90
GROUND FOR
ANODE
(PIN 014)
85
80
2.5
3.0
3.5
4.0
4.5
5.0
5.5
SUPPLY VOLTAGE (V)
2.5
3.0
3.5
4.0
4.5
5.0
5.5
SUPPLY VOLTAGE (V)
GROUND FOR
CATHODE
(PIN 03)
200µs/div
Pin Description
PIN
SSOP
1, 2, 3, 6–14, 23, 24
4, 5, 17
15
PDIP
1, 2, 3, 7–15, 26, 27
4, 5, 6, 19
17
NAME
O0 to O13
GND
ISET
FUNCTION
LED Cathode Drivers. O0 to O13 outputs sink current from
the display’s cathode rows.
Ground
Segment Current Setting. Connect ISET to GND through
series resistor R
SET
to set the peak current.
Address Input 1. Sets device slave address. Connect to
either GND, V+, SCL, SDA to give four logic combinations.
See Table 3.
Not Connected
Blink Output. Output is open drain.
Multiplex Clock Input. To use internal oscillator, connect
capacitor C
SET
from OSC to GND. To use external clock,
drive OSC with a 1MHz to 8MHz CMOS clock.
Address Input 0. Sets device slave address. Connect to
either GND, V+, SCL, SDA to give four logic combinations.
See Table 3.
I C-Compatible Serial Data I/O
I C-Compatible Serial Clock Input
LED Anode Drivers. O14 to O23 outputs source current to
the display’s anode columns.
Positive Supply Voltage. Bypass V+ to GND with a 47µF
bulk capacitor and a 0.1µF ceramic capacitor.
2
2
16
—
18
19
18
16, 25
20
21
AD1
N.C.
BLINK
OSC
20
21
22
25–31, 34, 35, 36
32, 33
22
23
24
28–34, 38, 39, 40
35, 36, 37
AD0
SDA
SCL
O14 to O23
V+
_______________________________________________________________________________________
5
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