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| LM3556_15 Datasheet, PDF (25/39 Pages) Texas Instruments – Synchronous Boost LED Flash Driver With High-Side Current Source | |||
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www.ti.com
LM3556
SNVS796D â AUGUST 2011 â REVISED OCTOBER 2015
7.6.1.11.1 Enable Register Mode Bits
00âStandby Off
01âIndicator Sets Indicator Mode. Default Indicator Mode uses external pattern on TORCH pin.
10âTorch Sets Torch Mode with ramping. If Torch EN = 0, Torch starts after I2C-compatible command.
11âFlash Sets Flash Mode with ramping. If Strobe EN = 0, Flash starts after I2C-compatible command.
7.6.1.11.2 Control Logic Delays
I2C Controlled Flash Start and Stop
Delay Times
I2C
Bus
I2C Flash
I2C Stop
Strobe Controlled Flash Start and
Stop Delay Times
STROBE
ILED
ILED
ta
tb
tc
td
External Indicator Start and Stop
Delay Times
Using Torch Pin
TORCH
TX event ± Start and Stop
Delay Times
TX
ILED
te
EDGE TRIG
STROBE
tf
ILED
tg
th
Flash time-out
Figure 40. Control Logic Delays
DELAY
ta
tb
tc
td
te
tf
tg
th
Table 13. Control Logic Delay Timing
EXPLANATION
Time for the LED current to start ramping up after an I2C Write command.
Time for the LED current to start ramping down after an I2C Stop command.
Time for the LED current to start ramping up after the STROBE pin is raised high.
Time for the LED current to start ramping down after the STROBE pin is pulled low.
Time for the LED current to start ramping up after the TORCH pin is raised high.
Time for the LED current to start ramping down after the TORCH pin is pulled low.
Time for the LED current to start ramping down after the TX pin is pulled high.
Time for the LED current to start ramping up after the TX pin is pulled low, provide the part has
not timed out in Flash Mode.
TIME
554 µs
32 µs
400 µs
16 µs
300 µs
16 µs
3 µs
2 µs
Copyright © 2011â2015, Texas Instruments Incorporated
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