BD6088GUL_11 ROHM [Rohm], BD6088GUL_11 Datasheet - Page 40

• Manufacturer Part Number: BD6088GUL_11
• Description: Mulitifunction Backlight LED Driver for Small LCD Panels (Charge Pump Type)
• Manufacturer: ROHM [Rohm]

© 2011 ROHM Co., Ltd. All rights reserved.
www.rohm.com
BD6088GUL
(12) Key back light 2-value decision
(13) Key back light PWM control
・ Capable of comparing luminosity factor data with judgment threshold value
・ Available for key backlight ON/OFF control based on illumination intensity.
・ Sets a threshold value and a hystresis via the registers.
・ Outputs ON or OFF for binary judgment via the KBLT terminal after PWM processing.
・ Allows a slope time to be set in the register via PWM.
・ A PWM cycle can choose 2 value.
・ It can be changed to the single control by the following setup of a register.
・ 32 levels Duty ratio (H level section) becomes the following set point.
Bit Name : CTH(3:0)
Bit Name : CHYS(1:0)
The threshold value and hystresis must meet the following condition:
Example: The backlight turns on with an illumination intensity of 7 and turns off with an illumination intensity of 5.
32 levels of duties prepared as MAX Duty are sequentially stepped at KBSLP time intervals.
Bit name: KBSLP(1:0)
The KBSLP(1:0), FPWM setting is effective.
with a hysteresis to determine binary judgment for illumination intensity.
CTH setting  CHYS setting
CTH[3:0]=7h CHYS[1:0]=1h
Bit name: FPWM
Step
10
11
12
13
14
15
KBMD
0
1
2
3
4
5
6
7
8
9
0
1
Duty(%)
10.94
12.50
14.06
15.63
17.19
18.75
20.31
21.88
23.44
0.00
1.56
3.13
4.69
6.25
7.81
9.38
KBEN
0
1
-
Step
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
Depend on ALC setting
KBLT output
40/51
0
1
Duty(%)
100.00
25.00
28.13
31.25
34.38
37.50
40.63
45.31
50.00
56.25
62.50
68.75
75.00
81.25
87.50
93.75
100
90
80
70
60
50
40
30
20
10
0
0
5
ON
10
The number of s t ep' s
Detect threshold level,
Ambient Level
15
setup is possible
Hysteresis
Technical Note
2011.04 - Rev.A
20
25
30
OFF