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16-Bit Constant Current LED Sink Driver with
LED Error Detection and Run-Time Current Adjustment
April 2005, VA.02
- 21 -
MBI5029
Current Gain
16-Bit Configuration Code
Bit 0 Bit 1 Bit 2 Bit 3 Bit 4 Bit 5 Bit 6 Bit 7 Bit 8 Bit 9 Bit 10 Bit 11 Bit 12 Bit 13 Bit 14 Bit 15
Meaning
-
HC
CC0 CC1 CC2 CC3 CC4 CC5
-
-
-
-
-
-
-
-
Default
Value
-
1
1
1
1
1
1
1
-
-
-
-
-
-
-
-
After entering the Current Adjust mode, the system controller can sends 7-bit Current Adjust code to 16-bit Shift
Register through MBI5029 SDI pin. Then sending LE/MOD/CA active pulse will transfer the contents in the Shift
Register to a 16-bit Configuration Latch rather than the 16-bit Output Latch in a Normal mode. The 7-bit Current
Adjust code in the Configuration Latch will directly affect the voltage at R-EXT terminal and output current Iout,target
by the current gain, G. The relationship between the Current Adjust Code {HC, CC〔0:5〕｝and current gain G is
shown below:
G = [(1 + 2 x HC)/3]x [(1 + D/32)/3]
where HC is 1 or 0 (HC=0 : Low current band; HC=1 : High current band) and
7-bit Current Adjust Code
G = 95/96
G = 1/3
G = 1/9
64 steps
(0,0,0,0,0,0,0)
(0,0,0,0,0,0,1)
(0,0,0,0,0,1,0)
(1,0,0,0,0,0,0)
64 steps
…
(1,1,1,1,1,1,1)
Note: “-“ means “reserved and not used now”
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