MAX8831 MAXIM [Maxim Integrated Products], MAX8831 Datasheet - Page 17

• Manufacturer Part Number: MAX8831
• Description: High-Efficiency, White LED Step-Up Converter with I2C Interface in 2mm x 2mm WLP
• Manufacturer: MAXIM [Maxim Integrated Products]

byte goes into the internal register of the MAX8831
selected by the command byte. If multiple data bytes
are transmitted before a STOP condition is detected,
these bytes are stored in subsequent MAX8831 internal
registers because the command byte address auto-
increments (Figure 11).
The MAX8831 is read using the MAX8831’s internally
stored command byte as an address pointer, the same
way the stored command byte is used as an address
pointer for a write. The pointer autoincrements after
each data byte is read, using the same rules as for a
write. Thus, a read is initiated by first configuring the
MAX8831’s command byte by writing the command
byte corresponding to the beginning register address
to be read. The master can now read n consecutive
Figure 11. I
Figure 12. I
Figure 13. I
High-Efficiency, White LED Step-Up Converter
S
S
S
2
2
2
C Multiple-Byte Write
C Single-Byte Read
C Multiple-Byte Read
S
AS
AM
P
START BIT
ACKNOWLEDGE SLAVE
ACKNOWLEDGE MASTER
STOP BIT
______________________________________________________________________________________
Message Format for Reading
7-BIT SLAVE
ADDRESS
7-BIT SLAVE
DATA BYTE
ADDRESS
FIRST DATA BYTE
7-BIT SLAVE
with I
LAST DATA
ADDRESS
BYTE
0
AM
0
2
AS
0
AM
AS
C Interface in 2mm x 2mm WLP
AS
AS
P
P
AM
S
AS
P
LAST DATA BYTE
S
AS
P
COMMAND
COMMAND
BYTE
BYTE
START BIT
ACKNOWLEDGE SLAVE
ACKNOWLEDGE MASTER
STOP BIT
COMMAND
BYTE
START BIT
ACKNOWLEDGE SLAVE
STOP BIT
bytes from the MAX8831, by first writing the read com-
mand (0x9B) to the MAX8831 (Figures 12 and 13).
When performing read-after-write verification, reset the
command byte’s address since the stored byte
address is autoincremented after the write.
The MAX8831 contains 19 registers that are accessible
through the I
descriptions for more details. The register contents are
reset to the default RESET values (shown in Table 3) if
V
The ON/OFF control register (ON/OFF_CNTL) enables
and disables the LED1–LED5 current regulators (Table
4). Write a 1 to the LED#_EN bit to enable that
DD
goes low.
AS
AM
A
AS
2
C interface (Table 3). See the register
S
P
S
FIRST DATA BYTE
MAX8831 I
7-BIT SLAVE
ADDRESS
7-BIT SLAVE
ON/OFF Control Register
ADDRESS
AS
2
1
C Registers
1
AS
AS
17