Datasheet

28
MSL2021 [DATASHEET]
42062A–LED–02/2013
Table 13-2. Main String Reference register (MREF, 0x20), defaults highlighted
13.3 Color-Adjust String Reference Voltage register (CAREF, 0x21)
Holds the DAC value that controls the reference voltage for the color-adjust string FET source feedback voltage. The
reference voltage equals decimal value of this register times 2mV. The default value for CASREF is 0x64, which equates
to CA
REF
= 200mV.
Table 13-3. Color-Adjust String Reference register (CAREF, 0x21), defaults highlighted
13.4 Fault Disable register (FAULT, 0x22)
Bits D0 and D1 control the fault response for the color-adjust string. For fault response behavior see “Fault Conditions”
on page 15. Bit D2 prevents the thermal shutdown fault from pulling FLTB low. Write 0x03 to this register to clear faults;
write 0x00 to re-enable fault response.
Table 13-4. Fault Disable register (FAULT, 0x22), defaults highlighted
Register name Address
Register data
D7 D6 D5 D4 D3 D2 D1 D0
MREF 0x20 MREF[7:0]
DEFAULT: M
REF
= 100 * 2mV = 200mV 01100100
M
REF
= 0  2mV = 0V 00000000
M
REF
= 255 * 2mV = 510mV 11111111
Register name Address
Register data
D7 D6 D5 D4 D3 D2 D1 D0
CAREF 0x21 CAREF[7:0]
DEFAULT: V
CAREF
= 100 * 2mV = 200mV 01100100
V
CAREF
= 0  2mV = 0mV 00000000
V
CAREF
= 255  2mV = 510mV 11111111
Register name Address
Register data
D7 D6 D5 D4 D3 D2 D1 D0
FAULT 0x22 - - - - - TSDMASK OCDIS SCDIS
DEFAULT 00000 0 1 1
Act on faults xxxxx 0 0 0
Disable LED Short Circuit Fault xxxxx x x 1
Disable String Open Circuit Fault xxxxx x 1 x
Do Not Allow Thermal Shutdown Fault to
Pull FLTB Low
xxxxx 1 x x