ADP8861 Analog Devices, ADP8861 Datasheet - Page 29

• Manufacturer Part Number: ADP8861
• Description: Charge Pump, 7-Channel Smart LED Driver with I2C Interface
• Manufacturer: Analog Devices

Specifications of ADP8861

• Vin Range: 2.5 to 5.5V
• Vout (v): 4.3 to 5.5
• Synchronous: No
• Package: 20-Lead LFCSP,20-Lead WLCSP
• Led Configuration: Parallel
• Topology: Capacitive
• I2c Support: Yes
• Max Iout (ma): 60mA
• Brightness Control: PWM
• Peak Efficiency (%): 89%
• Switching Frequency: 1.32MHz
• Over Volt Protection (v): 5.8V

Backlight Maximum Current Register (BLMX)—Register 0x09
Table 26. BLMX Bit Map
Bit 7
Reserved
Table 27. Bit Descriptions for the BLMX Register
Bit Name
N/A
BL_MC
Table 28. Linear and Square Law Currents Per DAC Code (SCR = 0)
DAC Code
0x00
0x01
0x02
0x03
0x04
0x05
0x06
0x07
0x08
0x09
0x0A
0x0B
0x0C
0x0D
0x0E
0x0F
0x10
0x11
0x12
0x13
0x14
0x15
0x16
0x17
0x18
0x19
0x1A
0x1B
0x1C
0x1D
0x1E
0x1F
0x20
0x21
Bit No.
7
[6:0]
Linear Law (mA)
0
0.236
0.472
0.709
0.945
1.181
1.417
1.654
1.890
2.126
2.362
2.598
2.835
3.071
3.307
3.543
3.780
4.016
4.252
4.488
4.724
4.961
5.197
5.433
5.669
5.906
6.142
6.378
6.614
6.850
7.087
7.323
7.559
7.795
Bit 6
Description
Reserved.
Backlight maximum current. The backlight maximum current can be set according to the linear or square law
function (see Table 28 for a complete list of values).
DAC
0000000
0000001
0000010
0000011
…
1111111
Bit 5
Linear Law (mA)
0
0.236
0.472
0.709
…
30
Square Law (mA)
0.002
0.007
0.017
0.030
0.047
0.067
0.091
0.119
0.151
0.186
0.225
0.314
0.365
0.476
0.538
0.603
0.671
0.744
0.820
0.900
0.984
1.071
1.163
1.257
1.356
1.564
1.674
1.905
2.026
0.000
0.268
0.419
1.458
1.787
Bit 4
1
Rev. A | Page 29 of 40
Square Law (mA)
0.000
0.002
0.007
0.017
…
30
DAC Code
0x22
0x23
0x24
0x25
0x26
0x27
0x28
0x29
0x2A
0x2B
0x2C
0x2D
0x2E
0x2F
0x30
0x31
0x32
0x33
0x34
0x35
0x36
0x37
0x38
0x39
0x3A
0x3B
0x3C
0x3D
0x3E
0x3F
0x40
0x41
0x42
0x43
Bit 3
BL_MC
Linear Law (mA)
8.031
8.268
8.504
8.740
8.976
9.213
9.449
9.685
9.921
10.157
10.394
10.630
10.866
11.102
11.339
11.575
11.811
12.047
12.283
12.520
12.756
12.992
13.228
13.465
13.701
13.937
14.173
14.409
14.646
14.882
15.118
15.354
15.591
15.827
Bit 2
Bit 1
Square Law (mA)
2.150
2.279
2.411
2.546
2.686
2.829
2.976
3.127
3.281
3.439
3.601
3.767
3.936
4.109
4.285
4.466
4.650
4.838
5.029
5.225
5.424
5.627
5.833
6.043
6.257
6.475
6.696
6.921
7.150
7.382
7.619
7.859
8.102
8.350
ADP8861
Bit 0
1