LM3556TMXSLASHNOPB datasheet(19/38 Pages) TI2

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LM3556

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SNVS796D – AUGUST 2011 – REVISED OCTOBER 2015

7.6 Register Maps

7.6.1 Register Descriptions

INTERNAL HEX ADDRESS

POWER ON/RESET VALUE

Silicon Revision and Filter Time Register

0x00

0x04

IVFM Mode Register

0x01

0x80

NTC Settings Register

0x02

0x12

Indicator Ramp Time Register

0x03

0x00

Indicator Blinking Register

0x04

0x00

Indicator Period Count Register

0x05

0x00

Torch Ramp Time Register

0x06

0x00

Configuration Register

0x07

0x78

Flash Features Register

0x08

0xD2

Current Control Register

0x09

0x0F

Enable Register

0x0A

0x00

Flags Register

0x0B

0x00

7.6.1.1 Silicon Revision and Filter Time Register (0x00)

Table 2. Silicon Revision and Filter Time Register Description

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

RFU

IVFM Filter Times

Bits available for Silicon Revision

'00' = 1/2 of the Current Step Time

Current Value = '100'

'01' = 256 µs

'10' =512 µs

'11' = 1024 µs

7.6.1.2 Input Voltage Flash Monitor (IVFM) Mode Register (0x01)

Table 3. Input Voltage Flash Monitor (IVFM) Mode Register Description

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

1 = UVLO EN

Hysteresis Level

IVM-D (Down) Threshold

IVFM Adjust Mode

(default)

00 = 50 mV (default)

000 = 2.9 V (default)

00 = Report Mode (default)

01 = 100 mV

001 = 3 V

01 = Stop and Hold Mode

10 = 150 mV

010 = 3.1 V

10 = Down Mode

11 = Hysteresis Disabled

011 = 3.2 V

11 = Up and Down Mode

100 = 3.3 V

101 = 3.4 V

110 = 3.5 V

111 = 3.6 V

00 = Report Mode Sets IVFM flag in Flags Register upon crossing IVM-D line Only. Does not adjust current.

01 = Stop and Hold Mode Stops current ramp and holds the level for the remaining flash if VIN crosses IVM-D

Line. Sets IVFM flag in Flags Register upon crossing IVM-D line.

10 = Down Mode Adjusts current down if VIN crosses IVM-D Line and stops decreasing once VIN rises above the

IVM-D line plus the IVFM hystersis setting. The LM3556 decreases the current throughout the flash

pulse anytime the input voltage falls below the IVM-D line, and not just once. The flash current does

not increase again until the next flash. Sets IVFM flag in Flags Register upon crossing IVM-D Line.

11 = Up and Down Mode Adjusts current down if VIN crosses IVM-D Line and adjusts current up if VIN rises

above the IVM-D line plus the IVFM hystersis setting. In this mode, the current continually adjusts

with the rising and falling of the input voltage throughout the entire flash pulse. Sets IVFM flag in

Flags Register upon crossing IVM-D Line.

UVLO EN

If enabled and VIN drops below 2.8 V, the LM3556 enters standby and sets the UVLO flag in the

Flags Register. Enabled = ‘1’, Disabled = ‘0’

IVM-U = IVM-D + IVFM Hysteresis

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