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LM3559

SNVS624B – JUNE 2011 – REVISED JUNE 2016

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Copyright © 2011–2016, Texas Instruments Incorporated

(1)

Bit 7 enables or disables the message indicator blinking function. With this bit set to 0 and Bit 6 set to 1, the message indicator turns on

constantly at the programmed current as set in the Indicator Register, bits [2:0].

8.6.1 Enable Register

Bits [1:0] of the Enable Register controls the ON/OFF state of torch mode, flash mode, and privacy-indicate

mode. Bits [4:3] turn on/off the main current sources (LED1 and LED2). Bit [5] sets the level or edge control for

the STROBE input. Bits 7 and 6 control the indicator current source (see Table 2).

Table 2. Enable Register Descriptions

Bit 7

(EN Blink)

Bit 6

(EN Message

Indicator)

Bit 5

(STROBE

Level/Edge)

Bit 4

(LED2

Enable)

Bit 3

(LED1

Enable)

Bit 2

(Not Used)

Bit 1

(EN1)

Bit 0

(EN0)

0 = Message

indicator

blinking

function is

(default)

1 = message

indicator

blinking

function is

enabled. The

message

indicator blinks

the pattern

programmed in

the Indicator

Register and

Indicator

Blinking

Register

0 = Message

Indicator is

disabled

(default)

1= Message

Indicator is

enabled.

0 = (Level Sensitive)

When STROBE goes

high, the flash current

will turn on and remain

on for the duration the

STROBE pin is held high

or until the flash timeout

occurs, whichever

comes first. (default)

1 = (Edge Triggered)

When STROBE goes

high , the flash current

will turn on and remain

on for the duration of the

Flash timeout.

0 = LED2 off

1 = LED2 on

(default)

0 = LED1 off

1 = LED1 on

(default)

N/A

Enable Bits

00 = Current sources are

shut down (default)

01 = Privacy-indicate mode

10 = Torch mode

11 = Flash mode (bits reset

at timeout)

8.6.2 Torch Brightness Register

Bits [2:0] of the Torch Brightness Register set the Torch current for LED1. Bits [5:3] set the torch current for

LED2. (see Table 3).

Table 3. Torch Brightness Register Descriptions

Bit 7

(N/A)

Bit 6

(N/A)

Bit 5

(TC2A)

Bit 4

(TC2B)

Bit 3

(TC2C)

Bit 2

(TC1A)

Bit 1

(TC1B)

Bit 0

(TC1C)

(Not Used)

LED2 Torch Current Select Bits

000 = 28.125 mA (56.25 mA total)

001 = 56.25 mA (112.5 mA total)

010 = 84.375 mA (168.75 mA total) default

011 = 112.5 mA (225 mA total)

100 = 140.625 mA (281.25 mA total)

101 = 168.75 mA (337.5 mA total)

110 = 196.875 mA (393.75 mA total)

111 = 225 mA (450 mA total)

LED1 Torch Current Select Bits

000 = 28.125 mA (56.25 mA total)

001 = 56.25 mA (112.5 mA total)

010 = 84.375 mA (168.75 mA total) default

011 = 112.5 mA (225 mA total)

100 = 140.625 mA (281.25 mA total)

101 = 168.75 mA (337.5 mA total)

110 = 196.875 mA (393.75 mA total)

111 = 225 mA (450 mA total)