MAX6971AUG

Number of Digits :
Packaging :
Mounting Style : SMD/SMT
Minimum Operating Temperature : - 40 C
Operating Supply Voltage : 3 V to 5.5 V
Maximum Operating Temperature : + 125 C
Package / Case : TSSOP-24
Maximum Supply Current : 25 mA
Number of Segments : 32


Features:

♦ 25Mb, Industry-Standard, 4-Wire Serial Interface
♦ 3V to 5.5V Logic Supply
♦ 16 Constant-Current LED Outputs Rated at 36V
♦ Up to 55mA Continuous Current per Output
♦ Output Current Programmed by Single Resistor
♦ 3% Current Matching Between Outputs
♦ 6% Current Matching Between ICs
♦ High-Dissipation, 24-Pin Packages
♦ -40°C to +125°C Temperature Range


Application

Variable Message Signs
Marquee Displays
Point-of-Order Signs
Traffic Signs
Gaming Features
Architectural Lighting


Pinout




Specifications

Voltage with respect to GND.
V+ ............................................................................-0.3V to +6V
OUT_ .....................................................................-0.3V to +40V
DIN, CLK, LE, OE, SET ................................-0.3V to (V+ + 0.3V)
DOUT Current ..................................................................±10mA
OUT_ Sink Current .............................................................60mA
Total GND Current ...........................................................960mA
Continuous Power Dissipation (TA = +70°C)
24-Pin TSSOP (derate 12.2mW/°C over +70°C) ..........975mW
24-Pin PDIP (derate 13.3mW/°C over +70°C)............1067mW
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


Description

The MAX6971AUG serial-interfaced LED driver provides 16 open-drain, constant-current-sinking LED driver outputs rated at 36V. The MAX6971AUG operates from a 3V to 5.5V supply. The MAX6971AUG supply and the LEDs' supply or supplies can power up in any order. The constant-current outputs are programmed together to up to 55mA using a single external resistor. The MAX6971AUG operates with a 25Mb, industry-standard, 4-wire serial interface.
The MAX6971AUG uses the industry-standard, shift-registerplus-latch-type serial interface. The driver MAX6971AUG accepts data shifted into a 16-bit shift register using data input DIN and clock input CLK. Input data appears at the DOUT output 16 clock cycles later to allow cascading of multiple MAX6971AUGs. The latch-enable input, LE, loads the 16 bits of shift register data into a 16-bit output latch to set which LEDs are on and which are off. The outputenable,OE, gates all 16 outputs on and off, and is fast enough to be used as a PWM input for LED intensity control.
For applications requiring LED fault detection, refer to the MAX6983*, which automatically detects open-circuit LEDs.
For safety-related applications requiring a watchdog timer, refer to the MAX6983, which includes a fail-safe feature that blanks the display if the serial interface becomes inactive for more than 1s.
The MAX6971AUG is one of a family of 12 shift-register-pluslatch-type LED drivers. The family includes 8-port and 16-port types, with 5.5V- or 36V-rated LED outputs, with and without open-circuit LED detection and watchdog.All versions of MAX6971AUG operate from a 3V to 5.5V supply, and are specified over the -40°C to +125°C temperature range.