LM3556TMXSLASHNOPB datasheet(24/38 Pages) TI2

24 / 38 page

LM3556

SNVS796D – AUGUST 2011 – REVISED OCTOBER 2015

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7.6.1.9 Flash Features Register (0x08)

Table 10. Flash Features Register Description

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

Inductor Current Limit

Flash Ramp Time

Flash Time-Out Time

00 =1.7 A

000 = 256 µs

000 = 100 ms

01 = 1.9 A

001 = 512 µs

001 = 200 ms

10 = 2.5 A

010 = 1.024 ms (default)

010 = 300 ms (default)

11 = 3.1 A (default)

011 = 2.048 ms

011 = 400 ms

100 = 4.096 ms

100 = 500 ms

101 = 8.192 ms

101 = 600 ms

110 = 16.384 ms

110 = 700 ms

111 = 32.768 ms

111 = 800 ms

7.6.1.10 Current Control Register (0x09)

Table 11. Current Control Register Description

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

RFU

Torch Current

Flash Current

000 = 46.88 mA (default)

0000 = 93.75 mA

001 =93.75 mA

0001 = 187.5 mA

010 =140.63 mA

0010 = 281.25 mA

011 = 187.5 mA

0011 = 375 mA

100 =234.38 mA

0100 = 468.75 mA

101 = 281.25 mA

0101 = 562.5mA

110 = 328.13 mA

0110 = 656.25 mA

111 =375 mA

0111 = 750 mA

1000 = 843.75 mA

1001 = 937.5 mA

1010 = 1031.25 mA

1011 = 1125 mA

1100 = 1218.75 mA

1101 = 1312.5 mA

1110 = 1406.25 mA

1111 = 1500 mA (default)

7.6.1.11 Enable Register (0x0A)

Table 12. Enable Register Description

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

TX Pin Enable

STROBE Pin

TORCH Pin

PreCharge Mode

Pass-Mode

Mode Bits: M1, M0

NTC Enable

0 = Disabled

Enable

Only Enable

00 = Standby (default)

0 = Disabled

(default)

0 = Disabled

0 = Normal

01 = Indicator

(default)

1 = Enabled

(default)

10 = Torch

1 = Enabled

1 = PreCharge

1 = Pass Only

11 = Flash

NTC EN

Enables NTC block.

TX EN

Allows TX events to change the current.

Strobe EN

Enables STROBE pin to start a flash event.

Torch EN

Enables TORCH pin to start a torch event.

PreCharge Mode EN Enables Pass Mode to pre-charge the output cap.

Pass-Only Mode EN Only allows Pass Mode and disallows Boost Mode.

If Pass-Only Mode is enabled during any LED mode (Indicator, Torch or Flash), it remains enabled

until the LM3556 enters the standby state regardless of whether the Pass-Only Mode bit is reset or

not during the following command.

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