AK7864A Datasheet, PDF (4/13 Pages) Asahi Kasei Microsystems – 3 channel LED driver with Charge Pump

[AK7864A]
 Current setting method
The method of setting the LED current is as follows.
Latch the logic level of CONT_R, CONT_G, CONT_B at the EN rise. This logic pattern decides the
current level. After the falling edge of the CONT_R, CONT_G, CONT_B, the LED current interlocks
with CONT_R, CONT_G, CONT_B’s on or off.
EN
CONT_R
CONT_G
CONT_B
The current level is set here
Turn RGB on
Not turn on
After first fall, LED is on with EN high period.
The relation between the CONT_R, CONT_G, CONT_B pattern and the current level follows.
CONT_R
0
0
0
0
1
1
1
1
CONT_G
0
0
1
1
0
0
1
1
CONT_B
0
1
0
1
0
1
0
1
Current setting
100%
87.5%
75%
62.5%
50%
37.5%
25%
12.5%
MS1336 - E - 00
4
2012/01