Datasheet

DS3882
Dual-Channel Automotive CCFL Controller
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Pin Description
PINS BY
CHANNEL (n)
FUNCTION
NAME
CH 1 CH 2
GAn
15
25
MOSFET A Gate Drive. Connect directly to logic-level mode n-channel MOSFET. Leave open if channel
is unused.
GBn
16
26
MOSFET B Gate Drive. Connect directly to logic-level mode n-channel MOSFET. Leave open if channel
is unused.
LCMn
17
27
Lamp Current Monitor Input. Lamp current is monitored by a resistor placed in series with the low-voltage
side of the lamp. Leave open if channel is unused.
OVDn
18
28
Overvoltage Detection. Lamp voltage is monitored by a capacitor divider placed on the high-voltage side
of the transformer. Leave open if channel is unused.
NAME
PIN FUNCTION
FAULT
1
Active-Low Fault Output. This open-drain pin requires external pullup resistor to realize high logic levels.
A0 2 Address Select Input. Determines I
2
C slave address.
SDA 3
Serial-Data Input/Output. I
2
C bidirectional data pin, which requires a pullup resistor to realize high logic
levels.
SCL 4 Serial Clock Input. I
2
C clock input.
LSYNC
5
Lamp Frequency Input/Output. This pin is the input for an externally sourced lamp frequency
when the DS3882 is configured as a lamp frequency receiver. If the DS3882 is configured as a lamp
frequency source (i.e., the lamp frequency is generated internally), the frequency is output on this pin for
use by other lamp frequency receiver DS3882s.
LOSC
6
Lamp Oscillator Resistor Adjust. A resistor to ground on this pin sets the frequency of the internal lamp
oscillator.
BRIGHT
7 Analog Brightness Control Input. Used to control the DPWM dimming feature. Ground if unused.
PSYNC
8
DPWM Input/Output. This pin is the input for an externally generated DPWM signal when the
DS3882 is configured as a DPWM receiver. If the DS3882 is configured as a DPWM source (i.e., the
DPWM signal is generated internally), the DPWM signal is output on this pin for use by other DPWM
receiver DS3882s.