MAX6973 查看數據表（PDF） - Maxim Integrated

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MAX6973

16-Output PWM LED Drivers for Message Boards

Maxim Integrated 

16-Output PWM LED Drivers

for Message Boards

Detailed Description

The MAX6972/MAX6973 drive 16 nonmultiplexed LEDs

or 32 multiplexed LEDs for various indoor and outdoor

display applications. The EZCascade serial interface

enables large multidriver display panels to be con-

structed with interconnected MAX6972/MAX6973

devices (see Figure 1).

The drivers provide 12-bit (MAX6972) or 14-bit

(MAX6973) individual PWM steps for each LED output.

Four to seven global-intensity bits provide additional

pulse-density modulation (PDM) intensity control (see

Table 1). The MAX6972/MAX6973 provide 19 bits of

total current/intensity control range per color per pixel,

or 18 bits if multiplexing. The total PWM dynamic range

encompasses gamma correction and, if desired, indi-

vidual LED calibration.

LED outputs are grouped in ports (Y and Z) with eight

LED outputs per port. Each port features its own cur-

rent calibration control DAC (CALDAC) with 0.31%

resolution to set the current. The MAX6972/MAX6973 cur-

rent calibration feature allows unmatched LEDS from dif-

ferent lots and manufacturers to be color matched.

Power-Up

On power-up, the MAX6972/MAX6973 set the calibration

current to the minimum current for all LED outputs and

clear the global-intensity PDM data, individual-intensity

PWM data, and the timing counters. The display

remains blank after CLKI starts running. The watchdog

function is inactive after power-up.

HOST

CLKO

DOUT

LOADO

MAX6972/

MAX6973

1

CLKI

CLKO

DIN

DOUT

LOADI

LOADO

MAX6972/

MAX6973

2

CLKI

CLKO

DIN

DOUT

LOADI

LOADO

MAX6972/

MAX6973

3

CLKI

CLKO

DIN

DOUT

LOADI

LOADO

MAX6972/

MAX6973

N

CLKI

CLKO

DIN

DOUT

LOADI

LOADO

LOADI

DIN

CLKI

Figure 1. Generic Cascaded Connection Scheme

OPTIONAL FEEDBACK

Table 1. Comparison of MAX6972/MAX6973

PART

MAX6972

MAX6973

LED DRIVE

OUTPUTS

16

(7V rated)

LED DRIVE CALIBRATION

CURRENT DAC RANGE

55mA

11mA to 55mA

GLOBAL PDM

DIRECT

MULTIPLEXED

7 bits

6 bits

5 bits

4 bits

3 bits

2 bits

INDIVIDUAL

PWM

12 bits

14 bits

8 _______________________________________________________________________________________

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