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Maxim Integrated Semiconductor Electronic Components Datasheet

MAX6973 Datasheet

(MAX6972 / MAX6973) 16-Output PWM LED Drivers

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19-0534; Rev 0; 5/06
EVAALVUAAILTAIOBNLEKIT
16-Output PWM LED Drivers
for Message Boards
General Description
The MAX6972/MAX6973 precision current-sinking,
16-output PWM LED drivers drive red, green, and/or blue
LEDs for full-color graphic message boards and video
displays. Each output has an individual 12-bit (MAX6972)
or 14-bit (MAX6973) PWM-intensity (hue) control and
7-bit (MAX6972) or 5-bit (MAX6973) global PWM intensity
(luminance) control. The MAX6972/MAX6973 also fea-
ture open-circuit LED fault-detection circuitry, as well as
a watchdog timer.
The driver has two banks of eight outputs, with each bank
intended to drive a different color in RGB applications.
The standard application uses three MAX6972/
MAX6973s to drive eight RGB LEDs. The full-scale current
for each bank of eight outputs is adjustable from 11mA
to 55mA in 256 steps (0.3125% per step) to calibrate
each color.
The MAX6972/MAX6973 can optionally multiplex by
using outputs MUX0 and MUX1, which each drive an
external pnp transistor. Multiplexing doubles the
MAX6972/MAX6973 drive capability to 32 LEDs.
The MAX6972/MAX6973 operate from a 3.0V to 3.6V
power supply. The LED power supply can range from
3Vwww.DataSheet4U.com to 7V. The LED drivers require only 0.8V headroom
above the LEDs’ forward-voltage drop. Using a sepa-
rate LED supply voltage for each LED minimizes power
consumption.
The serial interface uses differential signaling for the
high-speed clock and data signals to reduce EMI and
improve signal integrity. The MAX6972/MAX6973 buffer
all interface signals to simplify cascading devices in
modules that use a large number of drivers.
An internal watchdog timer, when enabled, automatically
clears the pixel-data registers and blanks the display if
any of the signal inputs fail to toggle within 40ms.
The MAX6972/MAX6973 are available in 32-pin TQFN
packages and operate over the -40°C to +125°C
temperature range.
Refer to the MAX6974/MAX6975 data sheet for a
24-output, 6mA to 30mA software-compatible device.
EZCascade is a trademark of Maxim Integrated Products, Inc.
Applications
LED Video Display Panels
LED Message Boards
Variable Message Signs (VMS)
Signs
Graphic Panels
Typical Operating Circuit appears at the end of data sheet.
Features
16 LED Current Sink Outputs (Two Banks of Eight
Outputs)
32 LED Drive Option When Multiplexing
33MHz Clock Supports Up to 63 Frames per
Second of Video
Constant Output Current Calibration from 11mA
to 55mA in 256 Steps
EZCascade™ Interface Simplifies Multiple Driver
Cascading Without External Buffers
12-Bit or 14-Bit Individual PWM LED Intensity
Controls
7-Bit or 5-Bit Panel PWM-Intensity Control
+3V to +7V LED Power Supply
+3.0V to +3.6V Logic Supply
Open-Circuit LED Fault Detection
Optional Watchdog Timer Blanks Display if
Interface Fails
Standard -40°C to +125°C Operating Temperature
Range
Ordering Information
PART
TEMP RANGE PIN-
PACKAGE
PKG
CODE
MAX6972ATJ+ -40°C to +125°C 32 TQFN-EP* T3255-5
MAX6973ATJ+ -40°C to +125°C 32 TQFN-EP* T3255-5
*EP = Exposed paddle.
+Denotes lead-free package.
Pin Configuration
TOP VIEW
24 23 22 21 20 19 18 17
Z7 25
16 Y7
Z6 26
EP* 15 Y6
Z5 27
14 Y5
Z4 28
Z3 29
Z2 30
MAX6972ATJ
MAX6973ATJ
13 Y4
12 Y3
11 Y2
Z1 31
Z0 32
+
10 Y1
9 Y0
1 2345678
*EP = EXPOSED PADDLE.
TQFN
5mm x 5mm
________________________________________________________________ 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.


Maxim Integrated Semiconductor Electronic Components Datasheet

MAX6973 Datasheet

(MAX6972 / MAX6973) 16-Output PWM LED Drivers

No Preview Available !

16-Output PWM LED Drivers
for Message Boards
ABSOLUTE MAXIMUM RATINGS
(All voltages with respect to GND.)
VDD ........................................................................-0.3V to +4.0V
Y0–Y7, Z0–Z7, MUX0, and MUX1 .........................-0.3V to +8.0V
All Other Pins..............................................-0.3V to (VDD + 0.3V)
Continuous Power Dissipation (TA = +70°C)
32-Pin TQFN (derate 34.5mW/°C over +70°C) ..........2857mW
Operating Temperature Range .........................-40°C to +125°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.
ELECTRICAL CHARACTERISTICS
(VDD = 3.0V to 3.6V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at VDD = 3.3V, TA = +85°C.) (Note 1)
PARAMETER
SYMBOL
Operating Supply Voltage
VDD
LEDs Anode Voltage
(Y0–Y7, Z0–Z7, MUX0, and MUX1)
VO
CONDITIONS
MIN TYP MAX UNITS
3.0 3.6 V
7V
fCLKI = 0Hz; CLKO_, DOUT_ loaded 200;
calibration DACs set to 0x01
21 35
Supply Current
IDD
fCLKI = 0Hz; CLKO_, DOUT_ loaded 200;
calibration DACs set to 0xFF
40 55 mA
fCLKI = 32MHz; CLKO_, DOUT_ loaded 200;
calibration DACs set to 0xFF
42 60
Input High Voltage LOADI
VIHC
0.7
x VDD
V
Input Low Voltage LOADI
VILC
0.3
x VDD
V
Differential Input Voltage Range
CLKI_, DIN_
VID
±0.15
±1.20 V
Common-Mode Input Voltage
CLKI_, DIN_
Differential Input High Threshold
Differential Input Low Threshold
Differential Output Voltage
CLKO_, DOUT_
VCM
VDIFFTH
VDIFFTL
VOD Termination 200at receiver _+ and _- inputs
|VID / 2|
8
-65 -8
±190
2.4
65
±550
V
mV
mV
mV
Differential Output Offset
CLKO_, DOUT_
VOS Termination 200at receiver _+ and _- inputs
1.125 1.25 1.375 V
Input Leakage Current
CLKI_, DIN_, LOADI
IIH, IIL
-1 +1 µA
Input Capacitance
CLKI_, DIN_, LOADI
Output Low Voltage LOADO
Output High Voltage LOADO
Output Slew Time LOADO
VOLC
VOHC
ISINK = 5mA
ISOURCE = 5mA
20% to 80%, 80% to 20%, load = 10pF
VDD
- 0.5
10
0.05
VDD
- 0.2
3
0.25
pF
V
V
ns
2 _______________________________________________________________________________________


Part Number MAX6973
Description (MAX6972 / MAX6973) 16-Output PWM LED Drivers
Maker Maxim Integrated Products
Total Page 23 Pages
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