MAX1996AETI+ Maxim Integrated Products, MAX1996AETI+ Datasheet - Page 14

• Manufacturer Part Number: MAX1996AETI+
• Description: Display Drivers CCFL Backlight Controller
• Manufacturer: Maxim Integrated Products

Specifications of MAX1996AETI+

• Lead Free Status / Rohs Status: Details

High-Efficiency, Wide Brightness
Range, CCFL Backlight Controller
Figure 5. DPWM Settings
Table 2. MINDAC Functionality
Table 3. Brightness Adjustment Ranges
Note: The current level range is solely determined by the MINDAC to REF ratio and is externally set.
14
Maximum
Brightness
Minimum
Brightness
0 ≤ V
RANGE
MINDAC = V
MINDAC = REF
______________________________________________________________________________________
CONDITION
MINDAC
100
90
80
70
60
50
40
30
20
10
0
< V
0
MODE = GND,
V
V
MODE = GND,
V
V
CC
POSITIVE-SCALE
CRF/SDA
CTL/SCL
CRF/SDA
MINDAC
REF
ADC MODE
4
8
DPWM SETTINGS
= 1/3V
BRIGHTNESS CODE
=
= 0,
DPWM disabled (always on 100% duty cycle). Operates in lamp-current control only.
(Use V
DPWM control enabled, duty cycle ranges from 9% to 100%.
Lamp-current control is disabled (always maximum current).
The device uses both lamp-current control and DPWM.
12
16
REF
MINDAC
20
MODE = REF,
V
MODE = REF,
V
V
NEGATIVE-SCALE
24
CRF/SDA
CRF/SDA
MINDAC
= 0 in the equations.)
ADC MODE
28
32
= 1/3V
= 0
= V
CTL/SCL
REF
,
Bright [4:0] = 11111
Bright [4:0] = 00000
V
MINDAC
Figure 6. Combined Power Level
SMBus
FUNCTION
= 1/3V
REF
100
90
80
70
60
50
40
30
20
10
0
0
DPWM AND LAMP-CONTROL CURRENT)
COMBINED POWER LEVEL (BOTH
4
Full-scale
DAC output =
387.5mV
Zero-scale
DAC output =
V
MINDAC
OUTPUT
8
DAC
BRIGHTNESS CODE
12
/5
16
20
CYCLE (%)
DPWM
DUTY
24
100
9
28
32
COMBINED
LEVEL (%)
POWER
100
3