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SC654ULTRT

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P22
16
Register Map
(1)
SC654
Address D5 D4 D3 D2 D1 D0
Reset
Value
Description
00h
BLEN6 BLEN5 BLEN4 BLEN3 BLEN2 BLEN1 00h Backlight Enable
01h
0
(2)
MBL4 MBL3 MBL2 MBL1 MBL0 00h Main Backlight Current
02h
0
(2)
SBL4 SBL3 SBL2 SBL1 SBL0 00h Sub Backlight Current
03h
0
(2)
TBL4 TBL3 TBL2 TBL1 TBL0 00h Third Backlight Current
04h
0
(2)
0
(2)
0
(2)
0
(2)
MFADE1 MFADE0 00h Main Fade
05h
0
(2)
0
(2)
0
(2)
MB2 MB1 MB0 00h Backlight Grouping Con guration
De nition of Registers and Bits
BL Enable Control Register (00h)
This register enables each individual LED.
BLEN6 — BLEN1 [D5:D0]
These active high bits enable the six backlight drivers.
Each LED can be controlled independently.
Notes:
(1) all registers are write-only.
(2) 0 = always write a 0 to these bits
17
Register and Bit De nitions (continued)
Main Backlight Current Control Register (01h)
This register is used to set the currents for the backlight
current sinks assigned to the Main Backlight Group. This
group can also be used to control red LEDs for limited RGB
control. These current sinks need to be enabled in the
Backlight Enable Control register to be active.
Bit D5
This bit is unused and is always a zero, so the maximum
pulse count for this register is 31.
MBL4 — MBL0 [D4:D0]
These bits are used to set the current for the main back-
light current sinks. All enabled main backlight current
sinks will sink the same current, as shown in Table 4.
Table 4 — Main Backlight Current Settings
MBL4 MBL3 MBL2 MBL1 MBL0 Backlight Current (mA)
00000 0
0 0 0 0 1 See note 1
0 0 0 1 0 See note 1
0 0 0 1 1 See note 1
00100 0.5
00101 1.0
00110 1.5
00111 2.0
01000 2.5
01001 3.0
01010 3.5
01011 4.0
01100 4.5
01101 5.0
01110 6.0
01111 7.0
10000 8.0
10001 9.0
10010 10
10011 11
10100 12
10101 13
10110 14
10111 15
11000 16
11001 17
11010 18
11011 19
11100 20
11101 21
11110 23
11111 25
(1) Reserved for future use
SC654
18
Register and Bit De nitions (continued)
Sub Backlight Current Control Register (02h)
This register is used to set the currents for the backlight
current sinks assigned to the Sub Backlight Group. This
group can also be used to control green LEDs for limited
RGB control. These current sinks need to be enabled in the
Backlight Enable Control register to be active.
Bit D5
This bit is unused and is always a zero, so the maximum
pulse count for this register is 31.
SBL4 — SBL0 [D4:D0]
These bits are used to set the current for the sub backlight
current sinks. All enabled sub backlight current sinks will
sink the same current, as shown in Table 5.
Table 5 — Sub Backlight Current Settings
SBL4 SBL3 SBL2 SBL1 SBL0 Backlight Current (mA)
00000 0
0 0 0 0 1 See note 1
0 0 0 1 0 See note 1
0 0 0 1 1 See note 1
00100 0.5
00101 1.0
00110 1.5
00111 2.0
01000 2.5
01001 3.0
01010 3.5
01011 4.0
01100 4.5
01101 5.0
01110 6.0
01111 7.0
10000 8.0
10001 9.0
10010 10
10011 11
10100 12
10101 13
10110 14
10111 15
11000 16
11001 17
11010 18
11011 19
11100 20
11101 21
11110 23
11111 25
(1) Reserved for future use
SC654
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P22

SC654ULTRT

Mfr. #:
Buy SC654ULTRT
Manufacturer:
Semtech
Description:
IC LED DRIVER RGLTR 25MA 14MLPQ
Lifecycle:
New from this manufacturer.
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