DS3994 Maxim Integrated Products, DS3994 Datasheet - Page 20

• 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
F4h: Control Register 1 (CR1)
20
U
BIT
.com
0
1
2
3
4
5
6
7
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POSCS
NAME
RGSO
DPSS
LFSS
LOC
ARD
DPD
FRS
Lamp Overcurrent
0 = Lamp overcurrent detection disabled.
1 = Lamp overcurrent detection enabled.
POSC Select. See POSCR0 and POSCR1 bits in Control Register 2 to select the oscillator range.
0 = Connect POSC to ground with a resistor to set the dimming frequency.
1 = Connect POSC to an external 22.5Hz to 440Hz dimming clock to set the dimming frequency.
Lamp Frequency Source Select
0 = Lamp frequency source mode. The lamp frequency is generated internally and sourced at the LSYNC
1 = Lamp frequency receiver mode. The lamp frequency must be provided at the LSYNC input.
DPWM Signal Source Select
0 = D P W M sour ce m od e. D P WM si g nal i s g ener ated i nter nal l y, and can b e outp ut at P S Y N C p i n ( see RGS O b i t) .
1 = DPWM receiver mode. DPWM signal is generated externally and supplied at the PSYNC input.
Ramp Generator Source Option
0 = Sources DPWM at the PSYNC output.
1 = Sources the internal ramp generator at PSYNC output.
Autoretry Disable
0 = Autoretry function enabled.
1 = Autoretry function disabled.
Fault Response Select
0 = Disable only the malfunctioning channel.
1 = Disable all channels upon fault detection at any channel.
DPWM Disable
0 = DPWM function enabled.
1 = DPWM function disabled. DPWM set to 100% duty cycle.
output for use by lamp frequency receivers.
FUNCTION