SP7682 datasheet(13/19 Pages) EXAR

13 / 19 page

Sept 27-07 rev G

SP7682: Backlight and Flash Driver

Page 13

The following table defines the states for bits PMP0 and

PMP1. These bits can be used to set the operating

mode for the internal charge pump.

PMP0

PMP1

State

Automatic mode detection.

1x mode only. 1.5x and 2x

modes are prohibited

1.5x mode only. 1x and 2x

modes are prohibited.

1x or 1.5x mode auto detection.

2x mode is prohibited.

The following table defines the states for bits LED0 to

LED3. These bits can be used to turn LEDs On or OFF.

LED0

LED1

LED2

LED3

State

LED0 OFF, other

LEDs ON.

LED1 OFF, other

LEDs ON.

LED2 OFF, other

LEDs ON.

LED3 OFF, other

LEDs ON.

The following table defines the states for bits WZ and

WP. These bits can be used to put the SP7682 into

shutdown, standby or active.

State

Shutdown, data registers are reset

to 000000

Shutdown,

data

registers

are

unchanged

Standby. Output current is zero, data

registers are unchanged.

Active. Output current corresponds

to the register contents

The following table defines the states for bits TOUT0 and

TOUT1.

These bits can be used to adjust current

threshold for the time-out feature in Flash mode.

TOUT0

TOUT1

State

Time-out disabled

Timeout enabled for 110mA

and above

Timeout enabled for 160mA

and above

Timeout enabled for 230mA

and above

The following table defines the states for bits TD0 and TD1.

These bits can be used to adjust time-out delay for the

time-out feature in Flash mode.

TD0

TD1

State

0.5s

Addressing and Writing Data to the SP7682

To write data to the SP7682 one of the following two

cycles must be obeyed:

Easy shutdown/startup sequence

[

Slave Address with write bit][Data for Status]

Full shutdown/startup sequence

[

Slave Address with write bit][Data for Status1][Data for

Status2][Data for LEDs][Data for FLASH]

Addressing and Reading Data from the SP7682

To read data from the SP7682 the following data cycle

must be obeyed:

[

Slave Address with read bit][Data for Status1][Data for

Status2][Data

for

LEDs][Data

for

FLASH]

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