12-Channels Pre-programmable Constant Current LED Driver

Version:A.006

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DM621

When there is two positive edges of SIN at DCK=”H”, DM621 produces CMD signal to

switch to command data mode. Then users have to input 8bits command data to set the

DM621 operating conditions described above. DM621 will latch command data into

internal registers by incorporating one positive edge of SIN at DCK=”H”. Meanwhile, the

CMD signal will return to zero.

Grayscale Data:

Figure 11. The timing diagram of grayscale data

According to the operating condition set at command mode, DM621 receives the 8bits/

10bits/12bits/14bits PWM grayscale data. DM621 will latch grayscale data by

incorporating one positive edges of SIN at DCK=”H”. Figure 11 is an illustration of 10-bits

PWM grayscale data when the command data PWM [1:0]=2’b01.

Complete Data Transference:

Figure 12. Detailed timing diagram of data transference

This is an illustration of the complete data transference of DM621. The command data

sets the condition is 10-bits PWM mode, no GCK frequency division, no inverse PWM

signal and the internal oscillator is utilized.