MAX6972EVKIT

MAX6972EVKIT Datasheet

MAX6972/MAX6973

Part	Datasheet
MAX6972EVKIT	MAX6972EVKIT (pdf)

PDF Datasheet Preview
16-Output PWM LED Drivers for Message Boards MAX6972/MAX6973 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 feature 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 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 3V to 7V. The LED drivers require only 0.8V headroom above the LEDs’ forward-voltage drop. Using a separate 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. LED Video Display Panels LED Message Boards Variable Message Signs VMS Signs Graphic Panels Typical Operating Circuit appears at the end of data sheet. 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 PINPACKAGE 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 AGND MUX1 CLKO+ CLKODOUT+ DOUTLOAD0 VDD TOP VIEW 24 23 22 21 20 19 18 17 Z7 25 16 Y7 Z6 26 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 VDD MUX0 CLKI+ CLKIDIN+ DINLOADI I.C. 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 16-Output PWM LED Drivers for Message Boards MAX6972/MAX6973 ABSOLUTE MAXIMUM RATINGS All voltages with respect to GND. VDD to +4.0V MUX0, and MUX1 .........................-0.3V to +8.0V All Other 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 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 Operating Supply Voltage LEDs Anode Voltage MUX0, and MUX1 CONDITIONS MIN TYP MAX UNITS fCLKI = 0Hz CLKO_, DOUT_ loaded calibration DACs set to 0x01 21 35 Supply Current fCLKI = 0Hz CLKO_, DOUT_ loaded calibration DACs set to 0xFF 40 55 mA fCLKI = 32MHz CLKO_, DOUT_ loaded calibration DACs set to 0xFF 42 60 Input High Voltage LOADI VIHC x VDD Input Low Voltage LOADI VILC x VDD Differential Input Voltage Range CLKI_, DIN_ Common-Mode Input Voltage CLKI_, DIN_ Differential Input High Threshold Differential Input Low Threshold Differential Output Voltage CLKO_, DOUT_ VCM VDIFFTH VDIFFTL VOD Termination at receiver _+ and _- inputs \|VID / 2\| 65 mV -65 -8 ±190 ±550 mV Differential Output Offset CLKO_, DOUT_ VOS Termination at receiver _+ and _- inputs

PDF Datasheet Preview

16-Output PWM LED Drivers for Message Boards

MAX6972/MAX6973

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 feature 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 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 3V to 7V. The LED drivers require only 0.8V headroom above the LEDs’ forward-voltage drop. Using a separate 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.

LED Video Display Panels

LED Message Boards

Variable Message Signs VMS

Signs

Graphic Panels

Typical Operating Circuit appears at the end of data sheet.
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 PINPACKAGE

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

AGND MUX1 CLKO+ CLKODOUT+ DOUTLOAD0 VDD

TOP VIEW
24 23 22 21 20 19 18 17

Z7 25
16 Y7

Z6 26
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

VDD MUX0 CLKI+ CLKIDIN+

DINLOADI

I.C.
*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
16-Output PWM LED Drivers for Message Boards

MAX6972/MAX6973

ABSOLUTE MAXIMUM RATINGS

All voltages with respect to GND. VDD to +4.0V MUX0, and MUX1 .........................-0.3V to +8.0V All Other 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 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

Operating Supply Voltage

LEDs Anode Voltage MUX0, and MUX1

CONDITIONS

MIN TYP MAX UNITS
fCLKI = 0Hz CLKO_, DOUT_ loaded calibration DACs set to 0x01
21 35

Supply Current
fCLKI = 0Hz CLKO_, DOUT_ loaded calibration DACs set to 0xFF
40 55 mA
fCLKI = 32MHz CLKO_, DOUT_ loaded calibration DACs set to 0xFF
42 60

Input High Voltage LOADI

VIHC
x VDD

Input Low Voltage LOADI

VILC
x VDD

Differential Input Voltage Range CLKI_, DIN_

Common-Mode Input Voltage CLKI_, DIN_

Differential Input High Threshold Differential Input Low Threshold

Differential Output Voltage CLKO_, DOUT_

VCM VDIFFTH VDIFFTL

VOD Termination at receiver _+ and _- inputs
|VID / 2|
65 mV
-65 -8
±190
±550 mV

Differential Output Offset CLKO_, DOUT_

VOS Termination at receiver _+ and _- inputs

Notice: we do not provide any warranties that information, datasheets, application notes, circuit diagrams, or software stored on this website are up-to-date or error free. The archived MAX6972EVKIT Datasheet file may be downloaded here without warranties.

Datasheet ID: MAX6972EVKIT 647383