SC621 datasheet(18/23 Pages) SEMTECH

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SC621

BL[4:0]

These bits are used to set the current for the backlight

current sinks. All enabled backlight current sinks will sink

the same current, as shown in Table 1.

BL_4

BL_3

BL_2

BL_1

BL_0

Backlight Current

(mA)

00000

0.5

00001

1.0

00010

1.5

00011

2.0

00100

2.5

00101

3.0

00110

3.5

00111

4.0

01000

4.5

01001

01010

5.5

01011

01100

6.5

01101

01110

7.5

01111

10000

8.5

10001

10010

9.5

10011

10100

10.5

10101

10110

11.5

10111

11000

11001

11010

11011

11100

11101

11110

11111

Table 1 — Backlight Current Control Bits

BL Enable Control Register (0x01)

This register is

used to enable the backlight current

sinks.

BLEN[4:1]

These bits are used to enable current sinks (active high,

default low).

BLEN_4 — Enable bit for backlight BL4

BLEN_3 — Enable bit for backlight BL3

BLEN_2 — Enable bit for backlight BL2

BLEN_1 — Enable bit for backlight BL1

When enabled, the current sinks will carry the current set

by the backlight current control bits BL[4:0], as shown in

Table 1.

Flash/Spotlight Control Register (0x02)

This register is used to configure the flash time-out feature,

the flash or spotlight current, and select flash or spotlight

current ranges.

FLTO

This bit is used to enable the flash safety time-out feature.

The default state is enabled with FLTO = 1. If this bit is set,

the device will turn off the flash after a nominal period of

1s. Two ways to re-enable the flash function after a safety

time-out are:

Pull the FLEN pin low to re-enable the flash

function

Clear and re-write FL[2:0]

FL[2:0]

These bits are used to set the current for the flash current

sink when configured for flash or spotlight by the FL/SPLB

bit. Bits FL[2:0] set the flash or spotlight current, as shown

in Table 2.

•

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