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| LED1642GW高亮度RGB LED阵列驱动解决方案 |
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| 文章来源： 更新时间：2014/6/3 10:19:00 |
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ST公司的LED1642GW是单片低压低电流16位移位寄存器,保证20V输出,能驱动几串串联的LED,输出级,16个稳压电流源提供3-40mA恒流来驱动LED,电流通过外接电阻可编程, 12/16位PWM亮度调节,工作电压3V-5.5V,主要用在全彩色/单色大型显示屏和LED标识牌.本文介绍了LED1642GW主要特性,框图和典型应用电路,以及采用LED1642GW和STM32 MCU的高亮度RGB LED阵列驱动评估板STEVAL-ILL061V1主要特性,框图,电路图,材料清单和PCB设计资料.
The LED1642GW is a monolithic, low voltage, low current power 16-bit shift register designed for LED panel displays. The LED1642GW guarantees 20 V output driving capability allowing the user to connect several LEDs in series. In the output stage, sixteen regulated current sources provide from 3 mA to 40 mA constant current to drive the LEDs. The current is programmed through an external resistor and can be adjusted by 7-bit current gain register in two subranges.The brightness can be adjusted separately for each channel through a 12/16-bit grayscale control.A programmable turn-on and turn-off time (four different values are available) improves the system low noise generation performances.
In the LED1642GW is available the open/short error detection mode. The auto power shutdown and auto power-on feature (this feature is selectable) allow the device to save power without any external intervention.
Thermal management is equipped with overtemperature data alert and the output thermal shutdown (170 ℃).The high clock frequency is up to 30 MHz and it makes the device suitable for high data rate transmission. A selectable gradual output delay reduces the inrush current whereas the selectable SDO synchronization feature works when the device is used in daisy chain configuration. The supply voltage range is between 3 V and 5.5 V.
LED1642GW主要特性:
• 16 constant current output channels
• Output current: from 3 mA to 40 mA
• Current programmable through external resistor
• 7-bit global current gain adjustment in two ranges
• 12/16-bit PWM grayscale brightness control
• Programmable output turn-on/off time
• Error detection mode (both open and shorted-LED)
• Programmable shorted-LED detection thresholds
• Auto power saving/auto-wakeup
• Selectable SDO synchronization on the CLK falling edge
• Gradual output delay (selectable)
• Supply voltage: 3 V to 5.5 V
• Thermal shutdown and overtemperature alert
• 30 MHz 4-wires interface
• 20 V current generator rated voltage
LED1642GW应用:
• Full color/monochrome large displays
• LED signage
图1. LED1642GW简化框图
图2. LED1642GW典型应用电路图
评估板STEVAL-ILL061V1
STEVAL-ILL061V1: high brightness RGB LED array driver with local dimming and diagnostics based on LED1642GW and STM32
This user manual describes features of the STEVAL-ILL061V1 evaluation board from STMicroelectronics. The board is based on the LED1642GW independent PWM LED driver controlled through an STM32 microcontroller SPI interface. An L7981 DC-DC converter provides the voltages and power for overall functioning of the board.
This manual explains how to use the board, including a description of the hardware setup,demonstration firmware functions, interconnection with a PC, graphical user interface to demonstrate the driver features, and how to evaluate of the LED1642GW device
图3. 评估板STEVAL-ILL061V1外形图
The STEVAL-ILL061V1 constant-current LED driver LED1642GW-based evaluation board consists of:
• Hardware: one evaluation board
• Software: graphical user interface
• Document: user manual
图4. 评估板STEVAL-ILL061V1框图
图5. 评估板STEVAL-ILL061V1电路图(1)
图6. 评估板STEVAL-ILL061V1电路图(2)
评估板STEVAL-ILL061V1材料清单:
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