Datasheet
Data Sheet ADP8866
Rev. A | Page 31 of 52
Backlight Maximum Current Register (BLMX)—Register 0x13
Table 37. BLMX Bit Map
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
Reserved BL_MC
Table 38.
Bit Name Bit No. Description
N/A 7 Reserved.
BL_MC [6:0] Backlight maximum current. The backlight maximum current can be set according to the square law function. All
values scale with the setting of LEVEL_SET. See Table 39 for a complete list of values.
DAC
Code
Current (mA)
(Full Scale =
25 mA)
LEVEL_SET =
000010
Current (mA)
(Full Scale =
12.5 mA)
LEVEL_SET =
001100
Current (mA)
(Full Scale =
8.25 mA)
LEVEL_SET =
010110
Current (mA)
(Full Scale =
6.25 mA)
LEVEL_SET =
100000
Current (mA)
(Full Scale =
5.0 mA)
LEVEL_SET =
101010
0x00 0.0 0.0 0.0 0.0 0.0
0x01 0.0016 0.0008 0.0005 0.0004 0.0003
0x02 0.0062 0.0031 0.0021 0.0016 0.0012
0x03 0.014 0.0070 0.0047 0.0035 0.0028
… … … … … …
0x7F 25.0 12.5 8.33 6.25 5.0
Table 39. Diode Output Currents per DAC Code
DAC Code
Current (mA)
(Full Scale = 25 mA)
LEVEL_SET = 000010
Current (mA)
(Full Scale = 12.5 mA)
LEVEL_SET = 001100
Current (mA)
(Full Scale = 8.25 mA)
LEVEL_SET = 010110
Current (mA)
(Full Scale = 6.25 mA)
LEVEL_SET = 100000
Current (mA)
(Full Scale = 5.0 mA)
LEVEL_SET = 101010
0x00 0.0 0.0 0.0 0.0 0.0
0x01 0.0016 0.0008 0.0005 0.0004 0.0003
0x02 0.0062 0.0031 0.0021 0.0016 0.0012
0x03 0.014 0.0070 0.0047 0.0035 0.0028
0x04 0.025 0.012 0.0083 0.0062 0.0050
0x05 0.039 0.019 0.013 0.010 0.0078
0x06 0.056 0.028 0.019 0.014 0.011
0x07
0.076
0.038
0.025
0.019
0.015
0x08 0.099 0.050 0.033 0.025 0.020
0x09 0.126 0.063 0.042 0.031 0.025
0x0A 0.155 0.078 0.052 0.039 0.031
0x0B 0.188 0.094 0.063 0.047 0.038
0x0C 0.223 0.112 0.074 0.056 0.045
0x0D 0.262 0.131 0.087 0.065 0.052
0x0E 0.304 0.152 0.101 0.076 0.061
0x0F 0.349 0.174 0.116 0.087 0.070
0x10 0.397 0.198 0.132 0.099 0.079
0x11 0.448 0.224 0.149 0.112 0.090
0x12 0.502 0.251 0.167 0.126 0.100
0x13 0.560 0.280 0.187 0.140 0.112
0x14 0.620 0.310 0.207 0.155 0.124
0x15 0.684 0.342 0.228 0.171 0.137
0x16 0.750 0.375 0.250 0.188 0.150
0x17 0.820 0.410 0.273 0.205 0.164
0x18
0.893
0.446
0.298
0.223
0.179
0x19 0.969 0.484 0.323 0.242 0.194
0x1A 1.05 0.524 0.349 0.262 0.210
0x1B 1.13 0.565 0.377 0.282 0.226
0x1C 1.22 0.608 0.405 0.304 0.243