MSL2042GU Atmel, MSL2042GU Datasheet - Page 19

• Manufacturer Part Number: MSL2042GU
• Description: LED Lighting Drivers 4Str RGB or White LED Driver lighting
• Manufacturer: Atmel

Specifications of MSL2042GU

• Rohs: yes
• Input Voltage: 10.8 V to 13.2 V
• Maximum Supply Current: 31.5 mA
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Package / Case: SOP-32
• Minimum Operating Temperature: - 40 C
• Power Dissipation: 1576 mW
• Factory Pack Quantity: 1000

Direct PWM Control of the LED Strings
An external PWM signal applied to the inputs PWM0 - PWM3 (MSL2041) or PWM0 (MSL2042) allows direct control
over the strings frequency and duty cycle. The PWM inputs recognize signals of DC to 50kHz, and 0% to 100% duty
cycle. The MSL2042, which allows only a single PWM input, calculates and applies a progressive delay of 1/4
frame successively to strings one - three, while string zero follows the PWM input directly.
Register Map Summary
Control the MSL2041/2 using the registers in the range 0x00 - 0x18. Register bit values always revert to their default
values (Table 4) when EN is taken high. Do not write to registers not listed in Table 3.
Table 3. Register Map
* Read Only Registers
Atmel LED Drivers-MSL2041/2042
REGISTER NAME
0x0E
0x00
0x02
0x03
0x08
0x09
0x0A
0x10
0x11
0x14
0x15
0x18
ADDRESS AND
0x0B - 0x0D
0x04 - 0x07
0x12 - 0x13
0x16 - 0x17
0x01
0x0F
FLTSTATUS*
RESERVED Must Be 0x04
STRINGEN
FBODAC1*
FBODAC2*
FBOSTAT*
FLTMASK
FBOCTRL
SCSTAT*
OCSTAT*
CONFIG
ISTR
Optimizer DAC
String Current
Configuration FLDBKEN I
FUNCTION
Fault Status
Circuit Fault
String Open
Circuit Fault
String Fault
8-Bit Global
FBO Status
LED String
LED Short
Readback
Efficiency
Optimizer
Efficiency
Control
Enable
Enable
Low-cost, Simple 4-string LED Drivers with External Current Sink
Atmel LED Drivers-MSL2041/MSL2042
MOSFETs, 5000:1 Dimming Range and Per String PWM Input
FBOSTEP[1:0]
D7
0
-
-
-
-
-
-
2
CTOEN
D6
0
-
-
-
-
-
-
FBIGNDSTAT[1:0]
HDRMSTEP[1:0]
D5
0
-
-
-
-
-
-
UNUSED
UNUSED
UNUSED
UNUSED
UNUSED
UNUSED
D4
0
-
-
-
-
-
-
REGISTER DATA
FBODAC1[7:0]
FBODAC2[7:0]
ISTR[7:0]
STRSCFEN STROCFEN
STRSCDET STROCDET
FLTMASK3
STR3EN
OC3
SC3
D3
0
-
-
FLTMASK2 FLTMASK1 FLTMASK0
STR2EN
SC2
OC2
D2
1
-
-
ACALEN
STR1EN
FBOEN
OC1
SC1
D1
0
-
-
th
the PWM
FLTBDRV
ICHKDIS
STR0EN
SLEEP
OC0
SC0
D0
0
-
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