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Direct PWM Control of the LED Strings
An external PWM signal applied to the PWM input allows direct PWM control over the strings when bits PWMEN and
PWMDIRECT (bits D0 and D1 in PWM Control register 0x2D) are set to 1. This configuration bypasses PHI and GSC, but
allows LED string phase delay via the Phase Delay Enable bit PHADLYEN (bit D0 of register 0x2E). With phase delay
enabled, a progressive delay of 1/16 the PWM frame is calculated and applied successively to each string drive signal.
Register Map and the E 2 PROM
Register Map Summary
Control the MSL2162 using the registers in the range 0x00 - 0xBF (Table 4). Two additional registers, 0xC0 and 0xC1,
allow access to, and programming of, the E 2 PROM. The power-up default values for all control registers (Table 5) are stored
within the on-chip E2PROM, and any of these E2PROM values may be changed through the serial interface
Table 4. Atmel LED Driver-MSL2162 Register Map
ADDRESS AND
REGISTER NAME
FUNCTION
D7
D6
D5
D4
REGISTER DATA
D3
D2
D1
D0
0x00
0x01
0x02
STRINGEN0
STRINGEN1
CONFIG
LED string
enables
Configuration
STR7EN
STR15EN
SLEEP
STR6EN STR5EN
STR14EN STR13EN
-
-
STR4EN
STR12EN
-
STR3EN
STR11EN
FLDBKEN
STR2EN
STR10EN
STR1EN
STR9EN
S TRSCDLY[2:0]
STR0EN
STR8EN
0x03
FLTEN
Fault enable
-
-
I 2 CTOEN
PHIMAXFEN GSCMAXFEN
STRSCFEN
STROCFEN
FBOOCFEN
0x04
0x05
STRFLTEN0
STRFLTEN1
String fault
enable
FEN7
FEN15
FEN6
FEN14
FEN5
FEN13
FEN4
FEN12
FEN3
FEN11
FEN2
FEN10
FEN1
FEN9
FEN0
FEN8
0x06
0x07
0x08
0x09
0x0A
0x0B
0x0F
0x10
0x11
0x12
FLTSTATUS
OCSTAT0
OCSTAT1
SCSTAT0
SCSTAT1
THRU 0x0E
OSCFREQ
FBOCTRL0
FBOCTRL1
FBOCTRL2
Fault status
String open
circuit fault
status
String short
circuit fault
status
Oscillator
frequency
Efficiency
Optimizer
control
FLTBDRV -
OC7 OC6
OC15 OC14
SC7 SC6
SC15 SC14
- -
HLDSTEP[1:0]
INCRSTEP[1:0]
- -
- PHIMAXFLT GSCMAXFLT STRSCFLT
OC5 OC4 OC3 OC2
OC13 OC12 OC11 OC10
SC5 SC4 SC3 SC2
SC13 SC12 SC11 SC10
UNUSED
- - -
FBCLDLY[1:0] FBSDLY[1:0]
DECRSTEP[1:0] INITPWM ACAL100
- - - FBO1OCEN
STROCFLT FBOOCFLT
OC1 OC0
OC9 OC8
SC1 SC0
SC9 SC8
O SCFREQ[2:0]
FBCFDLY[1:0]
ACALEN TRIDIS
FBO0OCEN FBOEN
0x13
0x14
0x15
0x16
0x17
0x20
0x21
0x22
0x23
0x24
FBODAC0
FBODAC1
FBODAC2
FBOSTAT
THRU 0x1F
GSCCTRL
GSCCNTR
GSCMUL
GSCDIV
Efficiency
optimizer
DAC
readback
Efficiency
optimizer
status
GSC
processing
control
Internal clock
counter for
GSC
GSC
multiplier
GSC Divider
-
GSCCHK-
SEL
-
FBO2OC
-
-
FBO1OC
-
-
FBODAC1[7:0]
FBODAC2[7:0]
FBODAC3[7:0]
- FBO2ACT
UNUSED
- GSCMAXEN
GSCCNTR[7:0]
GSCCNTR[15:8]
GSCDIV[7:0]
FBO1ACT
GSCPOL
G SCMUL[4:0]
FBOCAL
GSCPHI-
SYNCEN
FBOINITCAL
GSCINTEN
20
Atmel LED Driver-MSL2162
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