LM3697_15 Datasheet, PDF (18/43 Pages) Texas Instruments – High-Efficiency Three-String White LED Driver

LM3697
SNOSCS2C – NOVEMBER 2013 – REVISED OCTOBER 2015
www.ti.com
Table 6. Control A and B Start-up/Shutdown Ramp Time (Address 0x11 and 0x12)
0000 = 2048 µs (default)
0001 = 262 ms
0010 = 524 ms
0011 = 1.049 s
0100 = 2.09 s
0101 = 4.194 s
0110 = 8.389 s
0111 = 16.78 s
1000 = 33.55 s
1001 = 41.94 s
1010 = 50.33 s
1011 = 58.72 s
1100 = 67.11 s
1101 = 83.88 s
1110 = 100.66 s
1111 = 117.44 s
Bits [7:4]
Start-up Ramp
Bits [3:0]
Shutdown Ramp
0000 = 2048 µs (default)
0001 = 262 ms
0010 = 524 ms
0011 = 1.049 s
0100 = 2.097 s
0101 = 4.194 s
0110 = 8.389 s
0111 = 16.78 s
1000 = 33.55 s
1001 = 41.94 s
1010 = 50.33 s
1011 = 58.72 s
1100 = 67.11 s
1101 = 83.88 s
1110 = 100.66 s
1111 = 117.44 s
Table 7. Control A and B Run-Time Ramp Time (Address 0x13)
Bits [7:4]
Transition Time Ramp Up
000 = 2048 µs (default)
001 = 262 ms
010 = 524 ms
011 = 1.049 s
100 = 2.097 s
101 = 4.194 s
110 = 8.389 s
111 = 16.78 s
1000 = 33.55 s
1001 = 41.94 s
1010 = 50.33 s
1011 = 58.72 s
1100 = 67.11 s
1101 = 83.88 s
1110 = 100.66 s
1111 = 117.44 s
Bits [3:0]
Transition Time Ramp Down
000 = 2048 µs (default)
001 = 262 ms
010 = 524 ms
011 = 1.049 s
100 = 2.097 s
101 = 4.194 s
110 = 8.389 s
111 = 16.78 s
1000 = 33.55 s
1001 = 41.94 s
1010 = 50.33 s
1011 = 58.72 s
1100 = 67.11 s
1101 = 83.88 s
1110 = 100.66 s
1111 = 117.44 s
Reserved
Table 8. Control A and B Run-Time Ramp Configuration (Address 0x14)
Bits [7:4]
Not Used
Bits [3:2]
Control B Run-time Ramp Select
00 = Control A/B Runtime Ramp Times
(default)
01 = Control B Start-up/Shutdown Ramp
Times
1x = 0 µs Ramp Time
Bits [1:0]
Control A Run-time Ramp Select
00 = Control A/B Runtime Ramp Times
(default)
01 = Control A Start-up/Shutdown Ramp
Times
1x = 0 µs Ramp Time
Bits [7:4]
Not Used
Reserved
Table 9. Control A and B Brightness Configuration (Address 0x16)
Bit [3]
Bit [2]
Control B Dither Disable Control A Dither Disable
Bit [1]
Not Used
0 Enable (default)
1 Disable
0 Enable (default)
1 Disable
Reserved
Bit [0]
Control A/B Mapping
Mode
0 Exponential (default)
1 Linear
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