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Register Descriptions
The following tables define the operation of each register bit. Bold values are power-up defaults. These values apply only to I 2 C
version of the part.
Bit
Name
Default
Value
Description
GENERAL
Default: 00H
General Purpose Register
ADDR = 10H
7
6,5
4
3
2
1
0
PWM
FS1, FS2
EN6
EN5
EN4
EN3
ENA
0
00
0
0
0
0
0
Setting this bit=1 changes the EN pin to function as a PWM dimming input for
group A LEDs. This bit must be set to zero for the chip to be disabled.
00=20mA (default), 01=30mA, 10=15mA, 11=8mA when I 2 C is used.
Default=0 (Off), LED Channel Active=1
Default=0 (Off), LED Channel Active=1
Default=0 (Off), LED Channel Active=1
Default=0 (Off), LED Channel Active=1
Default=0 (Off), LED Channel Active=1
CONFIG
Default: 00H
Configuration Register
ADDR = 20H
7
6
5
4
3
2
1,0
T56
T34
S6A
S5A
S4A
S3A
RS1, RS0
0
0
0
0
0
0
00
Tie channel 5 and 6 together. Default=0 (Separate). Group 5&6 =1. Both currents
are set by CH5 register. T56 is overwritten by either S5A or S6A.
Tie channel 3 and 4 together. Default=0 (Separate). Group 3&4 =1. Both currents
are set by the CH3 register. T34 is overwritten by either S3A or S4A.
CH6 group configuration. Independent=0 (default); part of group A=1.
CH5 group configuration. Independent=0 (default); part of group A=1.
CH4 group configuration. Independent=0 (default); part of group A=1.
CH3 group configuration. Independent=0 (default); part of group A=1.
Sets current ramp rate for group A channels
CHA
Default: FFH
Group A Brightness Control
ADDR = A0H
7:6
5:0
Reserved
Brightness A
11
0 – 63
00 – 3FH
Vendor ID bits. These bits can be used to distinguish between vendors via I 2 C.
Writing to these bits does not change their value.
6-bit value that controls group A brightness per values in Table 1
CH3
Default:
Channel 3 Brightness Control
ADDR=30H
7:6
5:0
Reserved
Brightness 3
11
0 – 63
00 – 3FH
Writing to these bits does not change their value.
6-bit value that controls channel 3 brightness per values in Table 1
CH4
Default: FFH
Channel 4 Brightness Control
ADDR = 40H
7:6
5:0
Reserved
Brightness 4
11
0 – 63
00 – 3FH
Writing to these bits does not change their value.
6-bit value that controls channel 3 brightness per values in Table 1
CH5
Default: FFH
Channel 5 Brightness Control
ADDR = 50H
7:6
5:0
Reserved
Brightness 5
11
0 – 63
00 – 3FH
Writing to these bits does not change their value.
6-bit value that controls channel 3 brightness per values in Table 1
CH6
Default: FFH
Channel 6 Brightness Control
ADDR = 60H
7:6
5:0
Reserved
Brightness 6
11
0 – 63
00 – 3FH
Writing to these bits does not change their value.
6-bit value that controls channel 3 brightness per values in Table 1
? 2010 Fairchild Semiconductor Corporation
FAN5702 ? Rev. 1.0.4
15
www.fairchildsemi.com
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