SM8134A Datasheet, PDF (9/19 Pages) Nippon Precision Circuits Inc – White LED Driver IC

SM8134A
Mode data “0H”: Reset register
Mode data “EH”: Reset register
Setting data
D1
D2
D3
D4
High
All system data reset and standby
Low
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 dimming and control data must be reentered.
Mode data “2H”: DIN1 to 4 dimming register
Mode data “4H”: DIN5 dimming register
Setting data
D1
D2
D3
D4
DIN1 to 4
DIN5
Unit
0H
Low
Low
Low
Low
0
0
mA
1H
Low
Low
Low
High
2
10
mA
2H
Low
Low
High
Low
4
20
mA
3H
Low
Low
High
High
6
30
mA
4H
Low
High
Low
Low
8
40
mA
5H
Low
High
Low
High
10
50
mA
6H
Low
High
High
Low
12
60
mA
7H
Low
High
High
High
14
70
mA
8H
High
Low
Low
Low
16
80
mA
9H
High
Low
Low
High
18
90
mA
AH
High
Low
High
Low
20
100
mA
BH
High
Low
High
High
22
110
mA
CH
High
High
Low
Low
24
120
mA
DH
High
High
Low
High
26
130
mA
EH
High
High
High
Low
28
140
mA
FH
High
High
High
High
30
150
mA
Note. “H”: Hexadecimal
Note. Target values only. Current rating accuracy is not guaranteed.
D1 to D4 setting data bits control the LED current in 15 steps.
Mode data “5H”: LED ON register
Setting data
D1
D2
D3
D4
High
DIN_{1 to 4} ON
−
DIN5 ON
−
Low
DIN_{1 to 4} OFF
−
DIN5 OFF
−
This register controls the DIN_{1 to 4} and DIN5 ON/OFF state. Each state is ON when the corresponding bit is
HIGH, and OFF when LOW. Each circuit starts when the corresponding bit in address 5H (D1 or D3) is set
HIGH, transferring from standby mode. It is recommended that these data settings be held LOW when possible
to control current consumption.
SEIKO NPC CORPORATION —9