SC653 datasheet(19/22 Pages) SEMTECH

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SC653

Backlight Enable Control Register (01h)

This register is used to enable the backlight current

sinks.

BLEN[D4:D1]

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.

LDO1 Control Register (02h)

This register is used to enable LDO1 and set the output

voltage V

LDO1

LDO1[D3:D0]

These bits set the output voltage, V

LDO1

, as shown in

Table 2.

Table 2 — LDO1 Control Bits

LDO1_3

LDO1_2

LDO1_1

LDO1_0

LDO1

0000

OFF

0001

3.3V

0010

3.2V

0011

3.1V

0100

3.0V

0101

2.9V

0110

2.8V

0111

2.7V

1000

2.6V

1001

2.5V

1010

2.4V

1011

2.2V

1100

1.8V

1101

1.7V

1110

1.6V

1111

1.5V

LDO2 Control Register (03h)

This register is used to enable the LDO2 and to set the

output voltage V

LDO2

LDO2[D2:D0]

These bits are used to set the output voltage, V

LDO2

, as

shown in Table 3.

Table 3 — LDO2 Control Bits

LDO2_2

LDO2_1

LDO2_0

LDO2

OFF

1.8V

1.7V

1.6V

1.5V

1.4V

1.3V

1.2V

Fade Control Register (04h)

This register is used to enable the backlight fade and to

set the rise and fall rate at which fading proceeds.

FADE[D2:D1]

These bits are used to set the rise/fall rate between two

backlight currents as shown in Table 4.

Table 4 — Fade Control Bits

FADE_1

FADE_0

Fade Feature Rise/Fall Rate

(ms/step)

The number of steps in changing the backlight current

will be equal to the change in binary count of bits

BL[4:0].

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