SP7682 EXAR [Exar Corporation], SP7682 Datasheet - Page 12

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

I
Data input format:
S SP7682 Address
Theory of Operation - I²C Serial Interface
Sept 27-07 rev G
Start
Condition
2
The I
The SP7682 has four data registers which can be
to the bus as a transmitter and any device that reads
the data as a receiver. The device that controls the
data transfer is known as the master and the other
programmed serially via the I²C interface. The first
register is a status register which has two bits used
for shutdown/power up options, 4 bits used for
individual backlight LED ON/OFF control, and 2 bits
for charge pump mode.
register contains settings of the FLASH time-out,
SP7682 I
C Specifications
REGISTER
STATUS1
STATUS2
LEDS
FLASH
Fuse1
7-bit
0
0
1
1
2
C protocol defines any device that sends data
Fuses
2
C Slave Address Map: (7-bit Default Address: 0x28)
Fuse0
0
1
0
1
TOUT0
Acknowledge,
sent by slave
WZ
B7
D5
D5
A7
R/
1/0
0
0
0
0
W
TOUT1
The second STATUS
A6
1
1
1
1
WP
B6
D4
D4
A Data for
SP7682: Backlight and Flash Driver
Status1
8-bit
A5
Acknowledge, sent by slave when R/
Or, sent by master when R/
0
0
1
1
Device Address
PMP0
TD0
Page 12
B5
D3
D3
A
A4
1
0
1
0
Data for
8-bit
Status2
A3
PMP1
0
0
0
0
TD1
B4
D2
D2
A
A2
Data
For
LED
8-bit
0
0
0
0
W
device as the slave. The master will always initiate a
data transfer and will provide the serial clock for
synchronization.
Temperature OK, Voltage OK, and Flash time-out
expired conditions. After the Flash timeout has
expired the FTO bit will toggle on and then off for
intervals set by the TDO bits. The next two registers
are used to set the brightness levels of the backlight
LEDs and Flash LED.
The register bits are as follows:
=1
LED0
TOK
B3
D1
D1
A1
A
0
0
0
0
W
Data
Flash
8-bit
=0
for
R/W
A0
1/0
0
0
0
0
LED1
VOK
APPLICATIONS INFORMATION
B2
D0
D0
A
© 2007 Exar Corporation
SP
address
Stop
condition
A7-A1
0x28
0x20
0x38
0x30
7-bit
Hex
LED2
FTO
B1
dc
dc
LED3
B0
dc
dc
dc