LM3556_15 Datasheet, PDF (22/39 Pages) Texas Instruments – Synchronous Boost LED Flash Driver With High-Side Current Source

LM3556
SNVS796D – AUGUST 2011 – REVISED OCTOBER 2015
7.6.1.5 Indicator Blinking Register (0x04)
Bit 7
Table 6. Indicator Blinking Register Description
Bit 6
Bit 5
N_BLANK
0000 = 0 (default)
0001 = 1
0010 = 2
0011 = 3
0100 = 4
0101 = 5
0110 = 6
0111 = 7
1000 = 8
1001 = 9
1010 = 10
1011 = 11
1100 = 12
1101 = 13
1110 = 14
1111 = 15
Bit 4
Bit 3
Bit 2
Bit 1
Pulse Time (t_PULSE)
0000 = 0 (default)
0001 = 32 ms
0010 = 64 ms
0011 = 92 ms
0100 = 128 ms
0101 = 160 ms
0110 = 196 ms
0111 = 224 ms
1000 = 256 ms
1001 = 288 ms
1010 = 320 ms
1011 = 352 ms
1100 = 384 ms
1101 = 416 ms
1110 = 448 ms
1111 = 480 ms
7.6.1.6 Indicator Period Count Register (0x05)
Bit 7
RFU
Bit 6
RFU
Table 7. Indicator Period Count Register Description
Bit 5
RFU
Bit 4
RFU
Bit 3
RFU
Bit 2
Bit 1
N_PERIOD
000 = 0 (default)
001 = 1
010 = 2
011 = 3
100 = 4
101 = 5
110 = 6
111 = 7
t_PERIOD
t_PULSE
t_BLANK
t_PERIOD
t_PULSE
I_TORCH
t_R
t_F
t_PULSE
t_R
t_F
t_PULSE
Figure 37. Indicator Usage
1. Number of periods (t_PERIOD = t_R + t_F + t_PULSE × 2)
2. Active Time (t_ACTIVE = t_PERIOD × N_PERIOD)
3. Blank Time (t_BLANK = t_ACTIVE × N_BLANK)
t_PERIOD
t_BLANK
t_PERIOD
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Bit 0
Bit 0
Figure 38. Single Pulse With Dead Time
22
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