ISL6884 Datasheet, PDF (1/13 Pages) Intersil Corporation – CCFL Brightness Controller

®
Data Sheet
March 9, 2006
ISL6884
FN9265.0
CCFL Brightness Controller
ISL6884 controls Pulse Width Modulated Dimming for up to
8 inverters to supply power to up to 40 Cold Cathode
Fluorescent Lamps (CCFL) for back lighting in large LCD
displays.
The ISL6884 brightness controller provides an I²C interface
for dimming control, enable, status, and brightness balance.
The duty cycle of all 8 DPWM outputs is adjusted with a
Master Brightness Control register. The duty cycle of each of
the 8 DPWM outputs can be offset from the master
brightness to adjust for uniform brightness.
The PWM dimming frequency can be set by an internal,
adjustable oscillator or synchronized to an external source to
minimize interference with video.
ISL6884’s slave address is:
• 1101_1111 for reading
• 1101_1110 for writing
Ordering Information
PART
NUMBER
TEMP. RANGE
(^oC)
PACKAGE
PKG.
DWG. #
ISL6884IAZ
(See Note)
-40 to 85
20 Ld SSOP
(Pb-free)
M20.15
ISL6884IAZ-T
(See Note)
-40 to 85
20 Ld SSOP Tape M20.15
and Reel
(Pb-free)
NOTE: Intersil Pb-free plus anneal products employ special Pb-free
material sets; molding compounds/die attach materials and 100%
matte tin plate termination finish, which are RoHS compliant and
compatible with both SnPb and Pb-free soldering operations. Intersil
Pb-free products are MSL classified at Pb-free peak reflow
temperatures that meet or exceed the Pb-free requirements of
IPC/JEDEC J STD-020.
Features
• Wide Supply Voltage Range of 3.0V to 5.5V
• Dimming
- I²C dimming control input
- PWM dimming can be synchronized to an external
source or set by an internal, adjustable oscillator.
- 8 channel dimming allows the user to balance the
brightness of the CCFL lamps via I²C control
- User programmable fault time out
• User Programmable Fault Time Out
• I²C Status Output
• Pb-Free Plus Anneal Available (RoHS Compliant)
Pinout
ISL6884
(20 LD SSOP)
TOP VIEW
LAMP_ON ¹
TESTEN 2
GNDPLL 3
PLL1 4
EN 5
DPWM_SYNC 6
OSCTEST 7
SCL 8
SDA 9
GND 10
20 _VDD
19 REGCAP
18 DPWM_8
17 DPWM_7
16 DPWM_6
15 DPWM_5
14 DPWM_4
13 DPWM_3
12 DPWM_2
11 ^DPWM_1
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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