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High-Efficiency, White LED Step-Up Converter
with I 2 C Interface in 2mm x 2mm WLP
SDA BY
SDA
TRANSMITTER
D7
D6
D0
NOT ACKNOWLEDGE
SDA BY
RECEIVER
SCL
SCL
ACKNOWLEDGE
DATA LINE STABLE, CHANGE OF DATA
DATA IS VALID IS ALLOWED
S
1
2
8
9
START
CONDITION
CLOCK PULSE FOR
ACKNOWLEDGMENT
Figure 7. I 2 C Bit Transfer
Figure 8. I 2 C Acknowledge
SDA
1
0
0
1
1
0
1
R/W
ACK
MSB
SCL
Figure 9. MAX8831 Default Slave Address
LSB
S
7-BIT SLAVE
ADDRESS
0
AS
COMMAND
BYTE
AS
DATA BYTE
AS
P
S
AS
P
START BIT
ACKNOWLEDGE SLAVE
STOP BIT
Figure 10. I 2 C Single-Byte Write
MAX8831 Slave Address
The MAX8831 has a 7-bit-long slave address (Figure
9). The eighth bit following the 7-bit slave address is
the R/W bit. It is low for a write command, high for a
read command. The slave addresses available for the
MAX8831 are 1001101X (with a write/read address of
0x9A/0x9B). Contact the factory for other I 2 C address
options.
Message Format for Writing
A write to the MAX8831 comprises the transmission of
the MAX8831’s slave address with the R/W bit set to
zero (0x9A), followed by at least 1 byte of information.
The first byte of information is the command byte
(Figure 10), which determines which register of the
MAX8831 is to be written by the next byte, if received. If
a STOP condition is detected after the command byte
is received, the MAX8831 takes no further action
beyond storing the command byte. Any bytes received
after the command byte are data bytes. The first data
16
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