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

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16-channel 16-bit PWM Constant Current LED Driver

Version : A.003

Page 10

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DM634

Serial Data Interface

The serial-in data (DAI) will be clocked into 16 × 16 bit shift registers synchronized on the

rising edge of the clock (DCK). The data will be transferred into the 16 × 16 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

Serial-out Data Format

THF

LSB

OUT 15

MSB

shift out first

LSB

OUT 14

MSB

LSB

OUT 0

MSB

D

D

D

D

D

D

D

D

D

D

D

D

D

D

D

D

D

D

D

D

D

D

D

D

D

D

D

D

D

D

＊

0

are Error Messages of LED Open Detection. ｀1＇is normal, and ｀0＇is abnormal.

＊

THF is the Error Message of chip thermal detection. ｀1＇is normal, and ｀0＇is abnormal.