SM8133B Datasheet, PDF (12/20 Pages) Nippon Precision Circuits Inc – White LED Driver IC

SM8133B
Mode data “0H”: Reset register
Mode data “EH”: Reset register
Setting data
D1
D2
D3
D4
High
All system data reset
Low
System standby
Reset mode is selected if EN goes LOW 4 clock cycles after 0H or EH mode select data is input, regardless of
when power is applied or the parameter set data bits. When reset mode is selected, all data input previously is
reset, thus grouping, dimming, and control data must be reentered.
Mode data “1H”: Grouping register
Setting data
High
Low
D1
LED3 = B group
LED3 = A group
D2
LED4 = B group
LED4 = A group
D3
LED5 = B group
LED5 = A group
D4
LED6 = B group
LED6 = A group
LED1 and LED2 are always assigned to A group. When a setting data bit is LOW, A group is selected. When
HIGH, B group is selected.
Mode data “2H”: A group dimming register
Mode data “3H”: B group dimming register
Mode data “4H”: DIN7 dimming register
Setting data
D1
D2
D3
D4
Selected dimming
value
0H
Low
Low
Low
Low
0/15
1H
Low
Low
Low
High
1/15
2H
Low
Low
High
Low
2/15
3H
Low
Low
High
High
3/15
4H
Low
High
Low
Low
4/15
5H
Low
High
Low
High
5/15
6H
Low
High
High
Low
6/15
7H
Low
High
High
High
7/15
8H
High
Low
Low
Low
8/15
9H
High
Low
Low
High
9/15
AH
High
Low
High
Low
10/15
BH
High
Low
High
High
11/15
CH
High
High
Low
Low
12/15
DH
High
High
Low
High
13/15
EH
High
High
High
Low
14/15
FH
High
High
High
High
15/15
D1 to D4 setting data bits control the each group LED current in 15 steps. See “LED drive current”.
NIPPON PRECISION CIRCUITS INC.—12