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24-Output PWM LED Drivers
for Message Boards
Detailed Description
The MAX6974/MAX6975 drive 24 nonmultiplexed LEDs
or 48 multiplexed LEDs for various indoor and outdoor
display applications. The EZCascade serial interface
enables large multidriver display panels to be con-
structed with interconnected MAX6974/MAX6975
devices (see Figure 1).
The drivers provide 12-bit (MAX6974) or 14-bit
(MAX6975) 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 MAX6974/MAX6975 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.
HOST
LED outputs are grouped in ports (R, G, and B) with
eight LED outputs per port. Each port features its own
current calibration control DAC (CALDAC) with 0.31%
resolution to set the current. The MAX6974/
MAX6975 current calibration feature allows unmatched
LEDS from different lots and manufacturers to be
color matched.
Power-Up
On power-up, the MAX6974/MAX6975 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.
MAX6974/
MAX6975
1
MAX6974/
MAX6975
2
MAX6974/
MAX6975
3
MAX6974/
MAX6975
N
CLKO
DOUT
LOADO
CLKI
DIN
LOADI
CLKO
DOUT
LOADO
CLKI
DIN
LOADI
CLKO
DOUT
LOADO
CLKI
DIN
LOADI
CLKO
DOUT
LOADO
CLKI
DIN
LOADI
CLKO
DOUT
LOADO
LOADI
DIN
CLKI
OPTIONAL FEEDBACK
Figure 1. Generic Cascaded Connection Scheme
Table 1. Comparison of MAX6974/MAX6975
PART
MAX6974
LED DRIVE
OUTPUTS
LED DRIVE
CURRENT
CALIBRATION
DAC RANGE
GLOBAL PDM
DIRECT MULTIPLEXED
7 bits
6 bits
INDIVIDUAL
PWM
12 bits
MAX6975
24
(7V rated)
30mA
6mA to 30mA
5 bits
3 bits
4 bits
2 bits
14 bits
8
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相关代理商/技术参数
MAX6974ATL+T 功能描述:LED照明驱动器 24-Output PWM LED Driver RoHS:否 制造商:STMicroelectronics 输入电压:11.5 V to 23 V 工作频率: 最大电源电流:1.7 mA 输出电流: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:SO-16N
MAX6974ATL-T 制造商:Maxim Integrated Products 功能描述:24-OUTPUT PWM LED DRIVERS FOR MESSA - Tape and Reel
MAX6974EVKIT 功能描述:LED 照明开发工具 MAX6974 Evaluation Kit RoHS:否 制造商:Fairchild Semiconductor 产品:Evaluation Kits 用于:FL7732 核心: 电源电压:120V 系列: 封装:
MAX6974EVKIT+ 功能描述:LED 照明开发工具 MAX6974 Evaluation Kit RoHS:否 制造商:Fairchild Semiconductor 产品:Evaluation Kits 用于:FL7732 核心: 电源电压:120V 系列: 封装:
MAX6975ATL 功能描述:LED显示驱动器 RoHS:否 制造商:Micrel 数位数量:5 片段数量: 安装风格:SMD/SMT 封装 / 箱体:PLCC-44 工作电源电压:4.75 V to 11 V 最大电源电流:10 mA 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装:Tube
MAX6975ATL+ 功能描述:LED照明驱动器 24-Output PWM LED Driver RoHS:否 制造商:STMicroelectronics 输入电压:11.5 V to 23 V 工作频率: 最大电源电流:1.7 mA 输出电流: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:SO-16N
MAX6975ATL+T 功能描述:LED照明驱动器 24-Output PWM LED Driver RoHS:否 制造商:STMicroelectronics 输入电压:11.5 V to 23 V 工作频率: 最大电源电流:1.7 mA 输出电流: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:SO-16N
MAX6975ATL-T 功能描述:LED显示驱动器 RoHS:否 制造商:Micrel 数位数量:5 片段数量: 安装风格:SMD/SMT 封装 / 箱体:PLCC-44 工作电源电压:4.75 V to 11 V 最大电源电流:10 mA 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装:Tube