Dual-Channel Automotive CCFL Controller

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7

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

SDA

3

levels.

SCL

4

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.