SP7682 EXAR [Exar Corporation], SP7682 Datasheet - Page 13

• Manufacturer Part Number: SP7682
• Description: Backlight and Flash Driver in QFN 3mm x 3mm
• Manufacturer: EXAR [Exar Corporation]

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.
The following table defines the states for bits LED0 to
LED3. These bits can be used to turn LEDs On or OFF.
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.
Sept 27-07 rev G
WZ
0
0
1
1
PMP0
LED0
1
0
0
0
0
0
1
1
WP
0
1
0
1
LED1
PMP1
0
1
0
0
0
1
0
1
Shutdown, data registers are reset
to 000000
Shutdown,
unchanged
Standby. Output current is zero, data
registers are unchanged.
Active. Output current corresponds
to the register contents
LED2
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.
0
0
1
0
LED3
0
0
0
1
data
State
State
SP7682: Backlight and Flash Driver
LED0 OFF, other
LEDs ON.
LED1 OFF, other
LEDs ON.
LED2 OFF, other
LEDs ON.
LED3 OFF, other
LEDs ON.
registers
State
Page 13
are
The following table defines the states for bits TOUT0 and
TOUT1.
threshold for the time-out feature in Flash mode.
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.
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
TOUT0
0
0
1
1
These bits can be used to adjust current
TOUT1
0
1
0
1
for
TD0
0
0
1
1
© 2007 Exar Corporation
Time-out disabled
Timeout enabled for 110mA
and above
Timeout enabled for 160mA
and above
Timeout enabled for 230mA
and above
APPLICATIONS INFORMATION
LEDs][Data
TD1
0
1
0
1
State
State
0.5s
4s
2s
1s
for
FLASH]