ADP8866 Analog Devices, ADP8866 Datasheet - Page 31

• Manufacturer Part Number: ADP8866
• Description: Charge Pump Driven 9-Channel LED Driver with Automated LED Lighting Effects
• Manufacturer: Analog Devices

Specifications of ADP8866

• Vin Range: 2.5 to 5.5V
• Vout (v): 4.3 to 5.5
• Synchronous: No
• Package: 20-Lead LFCSP
• Led Configuration: Parallel
• Topology: Capacitive
• I2c Support: Yes
• Max Iout (ma): 25mA
• Brightness Control: I2C
• Peak Efficiency (%): 92%
• Switching Frequency: 1MHz

Backlight Maximum Current Register (BLMX)—Register 0x13
Table 37. BLMX Bit Map
Bit 7
Reserved
Table 38.
Bit Name
N/A
BL_MC
Table 39. Diode Output Currents per DAC Code
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
Bit No.
7
[6:0]
Current (mA)
(Full Scale = 25 mA)
LEVEL_SET = 000010
0.0
0.0016
0.0062
0.014
0.025
0.039
0.056
0.076
0.099
0.126
0.155
0.188
0.223
0.262
0.304
0.349
0.397
0.448
0.502
0.560
0.620
0.684
0.750
0.820
0.893
0.969
1.05
1.13
1.22
Bit 6
Description
Reserved.
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
0x00
0x01
0x02
0x03
…
0x7F
Current (mA)
(Full Scale =
25 mA)
LEVEL_SET =
000010
0.0
0.0016
0.0062
0.014
…
25.0
Bit 5
Current (mA)
(Full Scale = 12.5 mA)
LEVEL_SET = 001100
0.0
0.0008
0.0031
0.0070
0.012
0.019
0.028
0.038
0.050
0.063
0.078
0.094
0.112
0.131
0.152
0.174
0.198
0.224
0.251
0.280
0.310
0.342
0.375
0.410
0.446
0.484
0.524
0.565
0.608
Bit 4
Current (mA)
(Full Scale =
12.5 mA)
LEVEL_SET =
001100
0.0
0.0008
0.0031
0.0070
…
12.5
Rev. 0 | Page 31 of 52
Current (mA)
(Full Scale = 8.25 mA)
LEVEL_SET = 010110
0.0
0.0005
0.0021
0.0047
0.0083
0.013
0.019
0.025
0.033
0.042
0.052
0.063
0.074
0.087
0.101
0.116
0.132
0.149
0.167
0.187
0.207
0.228
0.250
0.273
0.298
0.323
0.349
0.377
0.405
Bit 3
BL_MC
Current (mA)
(Full Scale =
8.25 mA)
LEVEL_SET =
010110
0.0
0.0005
0.0021
0.0047
…
8.33
Bit 2
Current (mA)
(Full Scale = 6.25 mA)
LEVEL_SET = 100000
0.0
0.0004
0.0016
0.0035
0.0062
0.010
0.014
0.019
0.025
0.031
0.039
0.047
0.056
0.065
0.076
0.087
0.099
0.112
0.126
0.140
0.155
0.171
0.188
0.205
0.223
0.242
0.262
0.282
0.304
Current (mA)
(Full Scale =
6.25 mA)
LEVEL_SET =
100000
0.0
0.0004
0.0016
0.0035
…
6.25
Bit 1
Current (mA)
(Full Scale = 5.0 mA)
LEVEL_SET = 101010
0.0
0.0003
0.0012
0.0028
0.0050
0.0078
0.011
0.015
0.020
0.025
0.031
0.038
0.045
0.052
0.061
0.070
0.079
0.090
0.100
0.112
0.124
0.137
0.150
0.164
0.179
0.194
0.210
0.226
0.243
Current (mA)
(Full Scale =
5.0 mA)
LEVEL_SET =
101010
0.0
0.0003
0.0012
0.0028
…
5.0
ADP8866
Bit 0