| 當前位置：首頁(yè)->方案設計 |
|
| LED1642GW高亮度RGB LED陣列驅動(dòng)解決方案 |
|
|
| 文章來(lái)源： 更新時(shí)間：2014/6/3 10:19:00 |
在線(xiàn)咨詢(xún)： |
| |
ST公司的LED1642GW是單片低壓低電流16位移位寄存器,保證20V輸出,能驅動(dòng)幾串串聯(lián)的LED,輸出級,16個(gè)穩壓電流源提供3-40mA恒流來(lái)驅動(dòng)LED,電流通過(guò)外接電阻可編程, 12/16位PWM亮度調節,工作電壓3V-5.5V,主要用在全彩色/單色大型顯示屏和LED標識牌.本文介紹了LED1642GW主要特性,框圖和典型應用電路,以及采用LED1642GW和STM32 MCU的高亮度RGB LED陣列驅動(dòng)評估板STEVAL-ILL061V1主要特性,框圖,電路圖,材料清單和PCB設計資料.
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應用:
• Full color/monochrome large displays
• LED signage
圖1. LED1642GW簡(jiǎn)化框圖
圖2. LED1642GW典型應用電路圖
評估板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
圖3. 評估板STEVAL-ILL061V1外形圖
The STEVAL-ILL061V1 constant-current LED driver LED1642GW-based evaluation board consists of:
• Hardware: one evaluation board
• Software: graphical user interface
• Document: user manual
圖4. 評估板STEVAL-ILL061V1框圖
圖5. 評估板STEVAL-ILL061V1電路圖(1)
圖6. 評估板STEVAL-ILL061V1電路圖(2)
評估板STEVAL-ILL061V1材料清單:
|
| |
|
|
|
|
|
| |
| |
| |
 |
您可能對以下產(chǎn)品感興趣 |
 |
|
 |
| 產(chǎn)品型號 |
功能介紹 |
兼容型號 |
封裝形式 |
工作電壓 |
備注 |
| HTR3316 |
HTR3316是一款16路多功能LED驅動(dòng)器和 GPIO控制器。16個(gè)I/O端口中的任何一個(gè)都可以配置為L(cháng)ED驅動(dòng)器模式或GPIO模式。此外任何GPIO都可以單獨配置為輸入或輸出。 |
AW9523 |
QFN4×4-24L |
2.5V-5.5V |
16路LED驅動(dòng)器和GPIO控制器 |
| HTR3212 |
HTR3212是一款12路LED PWM驅動(dòng)器，PWM頻率可固定為3kHz或22kHz。每一路最大輸出電流可通過(guò)外置電阻REXT調節，最大38mA，并可獨立控制4檔可選。 |
|
QFN-20 |
2.5V-5.5V |
12路LED PWM驅動(dòng)器 |
| HTR3236 |
HTR3236是一款36路LED PWM驅動(dòng)器，PWM頻率可固定為3kHz或22kHz。每一路最大輸出電流可通過(guò)外置電阻REXT調節，最大38mA，并
可獨立控制4檔可選。每一路可通過(guò)I2C單獨控制256級細膩亮度調節。 |
IS31FL3236/SN3218 |
QFN-44 |
2.5V-5.5V |
36路LED PWM驅動(dòng)器 |
| HTR3218 |
HTR3218是一款18路LED PWM驅動(dòng)器，PWM頻率可固定為3kHz或22kHz。每一路最大輸出電流可通過(guò)外置電阻REXT調節，最大38mA，并可獨立控制4檔可選。每一路可通過(guò)I2C單獨控制256級細膩亮度調節。 |
IS31FL3218/SN3218 |
QFN-24 |
2.5V-5.5V |
18路LED PWM驅動(dòng)器 |
|
| |
|
| |
|
|
