DS3994 Maxim Integrated Products, DS3994 Datasheet - Page 8

• Manufacturer Part Number: DS3994
• Description: 4-Channel Cold Cathode Fluorescent Lamp Controller
• Manufacturer: Maxim Integrated Products

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DataSheet
4
4-Channel Cold-Cathode
Fluorescent Lamp Controller
8
DPWM FREQUENCY SET/
LAMP FREQUENCY SET
U
ANALOG BRIGHTNESS
DPWM CLOCK INPUT
EXTERNAL RESISTOR
EXTERNAL RESISTOR
.com
LAMP FREQUENCY
_____________________________________________________________________
CONFIGURATION
INPUT/OUTPUT
INPUT/OUTPUT
DPWM SIGNAL
I
2
CONTROL
C DEVICE
PORT
BRIGHT
LSYNC
PSYNC
FAULT
LOSC
POSC
SDA
SCL
A0
OSCILLATOR (±5%)
22.5Hz TO 440Hz
COMPATIBLE
INTERFACE
I
2
C-
OSCILLATOR (±2%)
20kHz TO 80kHz
DS3994
20kHz TO 80kHz
DPSS BIT
AT CR1.3
0
1
LFSS BIT AT
CR1.2
POSCS BIT
AT CR1.1
MUX
3-BYTE USER MEMORY
CONTROL REGISTERS
RGSO BIT
AT CR1.4
EEPROM
HANDLING
MUX
FAULT
GENERATOR
x512
PLL
RAMP
0
1
[10.24MHz TO 40.96MHz]
CHANNEL ENABLE
GENERATOR
CHANNEL FAULT
4-PHASE
ENABLE/POR
1
0
SYSTEM
DPSS BIT
AT CR1.3
MUX
22.5Hz TO 440Hz
TO 80kHz]
[20kHz
Functional Diagram
SIGNAL
DPWM
CONTROLLERS
INDEPENDENT
UVLO
2.0V
FOUR
CCFL
V
[4.5V TO 5.5V]
SVM
SUPPLY VOLTAGE
MONITOR
LCMn
LAMP CURRENT
MONITOR
OVDn
OVERVOLTAGE
DETECTION
GAn
GBn
GND
CC
MOSFET
GATE
DRIVERS