LM3556TMXSLASHNOPB datasheet(23/38 Pages) TI2

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LM3556

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SNVS796D – AUGUST 2011 – REVISED OCTOBER 2015

Figure 39. Multiple Pulse With Dead Time

7.6.1.7 Torch Ramp Time Register (0x06)

Table 8. Torch Ramp Time Register

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

RFU

Torch Ramp-Up Time

Torch Ramp-Down Time

000 = 16 ms (default)

001 = 32 ms

010 = 64 ms

011 = 128 ms

100 = 256 ms

101 = 512 ms

110 = 1.024 s

111 = 2.048 s

7.6.1.8 Configuration Register (0x07)

Table 9. Configuration Register Description

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

Strobe Pin

Torch Pin

TX Pin

TX Event Level

IVFM Enable

NTC Mode

Indicator Mode

Strobe Usage

Polarity

0 = Off

0 = Disabled

0 = Normal

0 = Internal

0 = Edge

0 = Active Low

1 = Torch Current

(default)

1 = Active

(default)

1 = Enabled

1 = Monitor

1 = External

1 = Level

High (default)

Strobe Usage Level or edge. Flash follows strobe timing if Level and internal timing if edge.

Strobe Polarity Active high or active low select.

Torch Polarity Active high or active low select.

TX Polarity Active high or active low select.

TX Event Level Transition to torch current level or off setting if TX event occurs.

The TX Event Level off setting is designed to force a shutdown only during a flash event. When

Torch or Indicator Mode is enabled, and a TX event occurs with the TX event level set to Off , the

LM3556 does not shut down. The TX flag bit (bit7 in the Table 14) is set, and the mode bits (bit0

and bit1 in Table 12) get locked out until the fault register is cleared via an I2C read. Because a TX

event is periodic and frequently occurring, clearing the fault register becomes more difficult.

Depending on the I2C read/write speed and TX event frequency, it may be necessary to set the TX

enable bit (bit6 in the Table 12) to a '0' before clearing the fault register to prevent future flag sets.

IVFM Enable Enables input voltage flash monitoring.

NTC Mode

Monitor Mode (report only) or Normal Mode (reduce current or shutdown).

Indicator Mode Externally generated via TORCH pin or internally generated PWM.

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