DS3988T+T&R Maxim Integrated Products, DS3988T+T&R Datasheet - Page 7

• Manufacturer Part Number: DS3988T+T&R
• Description: Display Drivers 8-Ch CCFL Controller All N-FET Drive, La
• Manufacturer: Maxim Integrated Products

Specifications of DS3988T+T&R

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

BRIGHT
PSYNC
LSYNC
FAULT
NAME
NAME
POSC
LOSC
LCMn
OVDn
GND
SVM
GAn
GBn
SDA
SCL
V
A0
CC
CH 1
13, 18,
24, 45
23, 48
1
2
3
4
PIN
37
38
39
40
41
42
43
44
46
47
CH 2
5
6
7
8
Ground Connection
Power-Supply Connection
Serial Data Input/Output. I
levels.
Serial Clock Input. I
Fault Output. Active-low, open-drain, requires 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
DS3988 is configured as a lamp frequency receiver. If the DS3988 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 DS3988s.
Lamp Oscillator Resistor Adjust. A resistor to ground on this lead sets the frequency of the lamp oscillator.
Address Select Input. Determines the DS3988’s I
DPWM Input/Output. This pin is the input for an externally generated DPWM signal when the DS3988 is
configured as a DPWM receiver. If the DS3988 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 DS3988s.
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.
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.
CH 3
PINS BY CHANNEL (n = 1–8)
10
11
12
9
CH 4
14
15
16
17
2
_____________________________________________________________________
C clock input.
CH 5
19
20
21
22
2
C bidirectional data pin, which requires a pullup resistor to realize high logic
Fluorescent Lamp Controller
CH 6
25
26
27
28
8-Channel Cold-Cathode
CH 7
29
30
31
32
DESCRIPTION
2
C slave address.
CH 8
33
34
35
36
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.
DESCRIPTION
Pin Description
7