Ver 1.1

17

LD1074

16-Channel Constant Current LED Driver With 16-Bit PWM Control and Dot-Correction

Shift Register

The effective length of the shift register in LD1074 is auto-adjusted among 256 / 192 / 128 / 16 bits according to

different modes of input data.

Write Configuration Register

LD1074 can write the configuration register when receiving one LE pulse containing 5 DCLKs, and then send 16-bit

configuration setting to each LED driver. The following waveform shows the input signal waveform when cascading

N pieces of LD1074 :

LD1074 can read the configuration register when receiving one LE pulse containing 5 DCLKs in order to set the

shift register length to 16 bits, and then send one LE pulse containing 6 DCLKs to read the configuration setting.

After the command, 16-bit configuration of each LD1074 will be shifted out sequentially from the Nth LD1074 to

the 1st LD1074. The following waveform shows the output signal waveform when cascading N pieces of LD1074 :

Read Configuration Register

Input the Dot Correction Data

LD1074 can input the dot correction data when receiving one LE pulse containing one DCLK, and then send

128-bit dot correction data to each LED driver. The following waveform shows the input signal waveform when

cascading N pieces of LD1074 :

LE

DCLK

SDI

LE+5DCLKs

Data of 1st LD1074

Cascade N x LD1074

LE

DCLK

SDO

16-bit configuration register data x N

Cascade N x LD1074

LE+5DCLKs

LE+6DCLKs

DCLK

LE

SDI

Cascade N x LD1074

12-bit dot correction data x N

LE+1DCLKs