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