LM3560 Datasheet, PDF(34/42 Page) Texas Instruments – LM3560 Synchronous Boost Flash Driver w/ Dual 1A High-Side Current Sources (2A Total Flash Current)

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LM3560 Datasheet, PDF (34/42 Pages) Texas Instruments – LM3560 Synchronous Boost Flash Driver w/ Dual 1A High-Side Current Sources (2A Total Flash Current)

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FLAGS REGISTER (Address 0xD0)

The Flags Register holds the flag bits indicating Flash Time-

out, Thermal Shutdown, LED Fault (Open or Short), TX In-

terrupts (TX1 and TX2), LED Thermal Fault (NTC), VIN

Monitor Trip, and VIN Flash Monitor Trip. All Flags are cleared

on read back of the Flags Register. (See Table 16).

TABLE 16. Flags Register Descriptions

Bit 7

(VIN Monitor)

Bit 6

(VIN Flash

Monitor)

Bit 5

(NTC Fault)

Bit 4

(TX2

Interrupt)

Bit 3

Bit 2

(TX1 Interrupt ) (LED Fault)

Bit 1

(Thermal

Shutdown)

Bit 0

(Flash Time-

out)

0 = VIN is

VIN did not fall 0 = LEDI/NTC 0 = TX2 has 0 = TX1 has not 0 = Proper

above the VIN below the VIN pin is above not changed changed state LED

Monitor

Flash Monitor 1V(default) state (default) (default)

Operation

Threshold or threshold

(default)

VIN Monitor during flash

Threshold is pulse turn-on

Disabled

or VIN Flash

(default)

Monitor is

disabled

(default)

0 = Die

0 = Flash

Temperature Time-Out did

below

not expire

Thermal

(default)

Shutdown

Limit (default)

1 = VIN

Monitor is

enabled and

VIN has fallen

below the

programmed

threshold

1 = VIN Flash

Monitor is

enabled and

VIN fell below

the

programmed

VIN Flash

Monitor

threshold

during flash

pulse turn-on

1 = NTC mode 1 = TX2 has 1 = TX1 has 1 = LED

1 = Die

is enabled and changed state changed state Failed (Open Temperature

LEDI/NTC has (TX2 mode (TX1 mode only) or Short)

has crossed

fallen below only)

the Thermal

Shutdown

Threshold

1 = Flash

Time-Out

Expired

CONFIGURATION REGISTER 1 (Address 0xE0)

Configuration Register 1 holds the STROBE Enable bit, the

STROBE polarity bit, the NTC Enable bit, the polarity selec-

tion bit for TX1 and TX2, and the Hardware Torch Enable bit

(see Table 17).

TABLE 17. Configuration Register 1 Descriptions

Bit 7

(Hardware

Torch Mode

Enable)

Bit 6

Bit 5

(TX2 Polarity) (TX1 Polarity)

Bit 4

(NTC Mode

Enable)

Bit 3

(STROBE

Polarity)

Bit 2

(STROBE

Input Enable)

Bit 1

(Not Used)

0 = TX1/

TORCH is a

TX input

(default)

0 = TX2 is

configured for

active low

polarity

0 = TX1 is

configured for

active low

polarity

0 = LEDI/NTC

pin is

configured as

an indicator

output

(default)

0 = STROBE 0 = STROBE N/A

Input Enable is Input Disabled

active low. (Default)

Pulling

STROBE low

will turn on

Flash current

1 = TX1/

1 =TX2 pin is

TORCH pin is configured for

a hardware active high

TORCH

polarity

enable. This (default)

bit is reset to 0

after a flash

pulse.

1 = TX1 is

configured for

active high

polarity

(default)

1 = LEDI/NTC

is configured

as a

comparator

input for an

NTC

thermistor

1 = STROBE

Input is active

high. Pulling

STROBE high

will turn on

Flash current

(default)

1 = STROBE

Input Enabled

Bit 0

(Not Used)

N/A

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