DS3994Z+W Maxim Integrated Products, DS3994Z+W Datasheet - Page 7

• Manufacturer Part Number: DS3994Z+W
• Description: Display Drivers 4-Ch Cold-Cathode Fl uorescent Controller
• Manufacturer: Maxim Integrated Products

Specifications of DS3994Z+W

• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

BRIGHT
PSYNC
LSYNC
FAULT
NAME
NAME
POSC
LOSC
LCMn
OVDn
GND
SVM
SDA
GAn
GBn
V
SCL
A0
CC
CH 1
PIN
10
15
16
25
26
27
28
7
8
9
5
6
1
2
3
4
PINS BY CHANNEL (n = 1–4)
Ground Connection
Power-Supply Connection
Analog Brightness Control Input. Used to control DPWM dimming. Ground when using a PWM signal at
PSYNC to control brightness.
Supply Voltage Monitor Input. Used to monitor the inverter voltage for undervoltage conditions.
Se r ia l D a t a I n p u t /O u t p u t . I
Serial Clock Input. I
Fault Output. This active-low, open-drain pin, requires an external pullup resistor to realize high logic levels.
Lamp Frequency Input/Output. This pin is the input for an externally sourced lamp frequency when the
DS3994 is configured as a lamp frequency receiver. If the DS3994 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 DS3994s.
Lamp Oscillator Resistor Adjust. A resistor to ground on this pin sets the frequency of the lamp oscillator.
Address Select Input. Determines the DS3994’s I
DPWM Input/Output. This pin is the input for an externally generated DPWM signal when the DS3994 is
configured as a DPWM receiver. If the DS3994 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 DS3994s.
DPWM Oscillator Resistor Adjust. A resistor to ground on this lead sets the frequency of the DPWM
oscillator (dimming clock). This lead can optionally accept a 22.5Hz to 440Hz clock as the source timing for
the internal DPWM signal.
CH 2
11
12
13
14
CH 3
17
18
19
20
_____________________________________________________________________
2
C clock input.
CH 4
21
22
23
24
2
C b i d i r ecti onal d ata p i n, w hi ch r eq ui r es a p ul l up r esi stor to r eal i ze hi g h l og i c l evel s.
Fluorescent Lamp Controller
MOSFET A Gate Drive. Connect directly to logic-level mode
n-channel MOSFET. Leave open if channel is unused.
MOSFET B Gate Drive. Connect directly to logic-level mode
n-channel MOSFET. Leave open if channel is unused.
Lamp Current Monitor Input. Lamp current is monitored by measuring a
voltage across a resistor placed in series with the low-voltage side of the
lamp. Leave open if channel is unused.
Overvoltage Detection. Lamp voltage is monitored through a capacitor-
divider placed on the high-voltage side of the transformer. Leave open if
channel is unused.
4-Channel Cold-Cathode
FUNCTION
2
C slave address.
FUNCTION
Pin Description
7