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PDF DM631 Data sheet ( Hoja de datos )
| Número de pieza | DM631 | |
| Descripción | 16-CHANNEL CONSTANT CURRENT LED DRIVER | |
| Fabricantes | SiTi | |
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Hay una vista previa y un enlace de descarga de DM631 (archivo pdf) en la parte inferior de esta página. Total 24 Páginas | ||
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DM631
Version
: A.003
Issue Date : 2008/05/12
File Name : SP-DM631-A.003.doc
Total Pages : 24
16-CHANNEL CONSTANT CURRENT LED DRIVER
WITH PROGRAMMABLE PWM OUTPUTS
新竹市科學園區展業一路 9 號 7 樓之 1
SILICON TOUCH TECHNOLOGY INC.
9-7F-1, Prosperity Road I, Science Based Industrial Park,
Hsin-Chu, Taiwan 300, R.O.C.
Tel：886-3-5645656 Fax：886-3-5645626
1 page  
點晶科技股份有限公司
SILICON TOUCH TECHNOLOGY INC.
新竹市科學園區展業一路 9 號 7 樓之 1
9-7F-1, Prosperity RoadⅠ, Hsin-Chu, Taiwan, R.O.C.
Tel：886-3-5645656 Fax：886-3-5645626
Equivalent Circuit of Inputs and Outputs
1. DCK, DAI, LAT , SOMODE/GCK terminals
DM631
2. DAO terminals
PCB Layout Consideration
To connect an external resistor to REXT pin and ground can determine the maximum output
current. If there is any disturbance occurred to REXT pin, the constant current output may be
unstable or noisy. Since REXT (pin23), DAO (pin22), and SOMODE/GCK (pin21) are next to each
other, the most possible interference is caused by DAO or SOMODE/GCK signal. Accordingly, it is
recommended that adding some shielding area within the above pins in PCB layout, or laying the
signal line of above pins on different PCB layer will prevent the noise problems effectively.
16-channel 12-bit PWM Constant Current LED Driver Version:A.003
未經授權而逕予重製、複製、使用或公開本文件，行為人得被追究侵權之相關民刑事責任
Unauthorized reproduction, duplication, use or disclosure of this document will be deemed as infringement.
Page 4
5 Page 
點晶科技股份有限公司
SILICON TOUCH TECHNOLOGY INC.
新竹市科學園區展業一路 9 號 7 樓之 1
9-7F-1, Prosperity RoadⅠ, Hsin-Chu, Taiwan, R.O.C.
Tel：886-3-5645656 Fax：886-3-5645626
Serial Data Interface
DM631
The serial-in data (DAI) will be clocked into 16 × 12 bit shift registers synchronized on the
rising edge of the clock (DCK). The data will be transferred into the 16 × 12 bit latch registers
when the strobe signal ( LAT ) is kept at high level (level trigger); otherwise, the data will be held.
The latch pulse should be sent after the falling edge of the last clock within a frame data. The trigger
timing of the serial-out data (DAO) will be shifted out on synchronization to the rising edge of the
clock if serial out selection (SOMODE) is kept at low level. And if serial out selection (SOMODE)
is kept at high level, the serial-out data (DAO) will be shifted out on synchronization to the falling
edge of the clock (DCK).
Input Data Format
LED Open Detection
DM631 provides a real time monitor of LED open detection function without extra components
or circuit design. It will be identified as a LED open failure when the output is turned on but the
output voltage is below 0.3V. The test result of each channel will write to its correspondent shift
register which is in LSB position (D15[0], D14[0], …., D0[0]) while strobe signal is active. User can
refer to timing diagram on page13. Detecting report could be retrieved from serial-out (DAO) data.
If the system reads ‘1’ back, that indicates LED is in normal status. But if ‘0’ was retrieved then
LED open failure has occurred. In order to make sure LED open detection function is in well
operating condition, it is recommended that all the luminance data are wrote to ‘1’ then almost
turning on the outputs during detection process.
16-channel 12-bit PWM Constant Current LED Driver Version:A.003
未經授權而逕予重製、複製、使用或公開本文件，行為人得被追究侵權之相關民刑事責任
Unauthorized reproduction, duplication, use or disclosure of this document will be deemed as infringement.
Page 10
11 Page | ||
| Páginas | Total 24 Páginas | |
| PDF Descargar | [ Datasheet DM631.PDF ] | |
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