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I2C Flash

I2C Stop

STROBE

I2C

Bus

ILED

TORCH

ILED

I2C Controlled Flash Start and Stop

Delay Times

Strobe Controlled Flash Start and

Stop Delay Times

External Indicator Start and Stop

Delay Times

Using Torch Pin

ILED

Flash time-out

TX event ± Start and Stop

Delay Times

EDGE TRIG

STROBE

LM3556

www.ti.com

SNVS796D – AUGUST 2011 – REVISED OCTOBER 2015

7.6.1.11.1

Enable Register Mode Bits

00–Standby Off

01–Indicator Sets Indicator Mode. Default Indicator Mode uses external pattern on TORCH pin.

10–Torch

Sets Torch Mode with ramping. If Torch EN = 0, Torch starts after I2C-compatible command.

11–Flash

Sets Flash Mode with ramping. If Strobe EN = 0, Flash starts after I2C-compatible command.

7.6.1.11.2

Control Logic Delays

Figure 40. Control Logic Delays

Table 13. Control Logic Delay Timing

DELAY

EXPLANATION

TIME

Time for the LED current to start ramping up after an I2C Write command.

554 µs

Time for the LED current to start ramping down after an I2C Stop command.

32 µs

Time for the LED current to start ramping up after the STROBE pin is raised high.

400 µs

Time for the LED current to start ramping down after the STROBE pin is pulled low.

16 µs

Time for the LED current to start ramping up after the TORCH pin is raised high.

300 µs

Time for the LED current to start ramping down after the TORCH pin is pulled low.

16 µs

Time for the LED current to start ramping down after the TX pin is pulled high.

3 µs

Time for the LED current to start ramping up after the TX pin is pulled low, provide the part has

2 µs

not timed out in Flash Mode.

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