DS3882_10 Datasheet, PDF (1/31 Pages) Maxim Integrated Products – Dual-Channel Automotive CCFL Controller

19-5666; Rev 2; 12/10
Dual-Channel Automotive CCFL Controller
General Description
The DS3882 is a dual-channel cold-cathode fluorescent
lamp (CCFL) controller for automotive applications that
provides up to 300:1 dimming. It is ideal for driving
CCFLs used to backlight liquid crystal displays (LCDs)
in navigation and infotainment applications and for dri-
ving CCFLs used to backlight instrument clusters. The
DS3882 is also appropriate for use in marine and avia-
tion applications.
The DS3882 features EMI suppression functionality and
provides a lamp current overdrive mode for rapid lamp
heating in cold weather conditions. The DS3882 sup-
ports configurations of 1 or 2 lamps with fully indepen-
dent lamp control and minimal external components.
Multiple DS3882 controllers can be cascaded to sup-
port applications requiring more than 2 lamps. Control of
the DS3882, after initial programming setup, can be
completely achieved through I²C software communica-
tion. Many DS3882 functions are also pin-controllable if
software control is not desired.
Applications
Automotive LCDs
Instrument Clusters
Marine and Aviation LCDs
Pin Configuration
TOP VIEW
+
FAULT 1
A0 2
SDA 3
SCL 4
LSYNC 5
LOSC 6
BRIGHT 7
PSYNC 8
POSC 9
A1 10
GND_S 11
SVML 12
SVMH 13
V_CC 14
DS3882
TSSOP
28 OVD2
27 LCM2
26 GB2
25 GA2
24 V_CC
23 PDN
22 LCO
21 GND
20 STEP
19 N.C.
18 OVD1
17 LCM1
16 GB1
15 GA1
Features
♦ Dual-Channel CCFL Controllers for Backlighting
LCD Panels and Instrument Clusters in
Automotive Navigation/Infotainment Applications
♦ Minimal External Components Required
♦ I²C Interface
♦ Per-Channel Lamp-Fault Monitoring for Lamp-
Open, Lamp-Overcurrent, Failure to Strike, and
Overvoltage Conditions
♦ Status Register Reports Fault Conditions
♦ Accurate (±5%) Independent On-Board Oscillators
for Lamp Frequency (40kHz to 100kHz) and DPWM
Burst-Dimming Frequency (22.5Hz to 440Hz)
♦ Lamp and DPWM Frequencies can be
Synchronized with External Sources to Reduce
Visual LCD Artifacts in Video Applications
♦ Optional Spread-Spectrum Lamp Clock Reduces
EMI
♦ Lamp Frequency can be Stepped Up or Down to
Move EMI Spurs Out of Band
♦ Lamp Current Overdrive Mode with Automatic
Turn-Off Quickly Warms Lamp in Cold
Temperatures
♦ Analog and Digital Brightness Control
♦ 300:1 Dimming Range Possible Using the Digital
Brightness Control Option
♦ Programmable Soft-Start Minimizes Audible
Transformer Noise
♦ On-Board Nonvolatile (NV) Memory Allows Device
Customization
♦ 8-Byte NV User Memory for Storage of Serial
Numbers and Date Codes
♦ Low-Power Standby Mode
♦ 4.75V to 5.25V Single-Supply Operation
♦ Temperature Range: -40°C to +105°C
♦ 28-Pin TSSOP Package
Ordering Information
PART
TEMP RANGE
PIN-PACKAGE
DS3882E+C
-40°C to +105°C 28 TSSOP
DS3882E+T&R/C -40°C to +105°C 28 TSSOP
+Denotes a lead(Pb)-free/RoHS-compliant package.
T&R = Tape and reel.
Typical Operating Circuit appears at end of data sheet.
______________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.