MAX8649 Maxim Integrated Products, MAX8649 Datasheet - Page 19

• Manufacturer Part Number: MAX8649
• Description: 1.8A Step-Down Regulator
• Manufacturer: Maxim Integrated Products

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The method for reading a single register (byte) is
shown in Figure 15a. To read a single register:
1) The master sends a start command.
2) The master sends the 7-bit slave address followed
3) The addressed slave asserts an acknowledge by
4) The master sends an 8-bit register pointer.
5) The slave acknowledges the register pointer.
6) The master sends a repeated START (S) condition.
7) The master sends the 7-bit slave address followed
8) The slave asserts an acknowledge by pulling SDA low.
9) The slave sends the 8-bit data (contents of the
10) The master asserts a not acknowledge by keeping
11) The master sends a STOP (P) condition.
In addition, the MAX8649 can read a block of multiple
sequential registers as shown in Figure 15b. Use the fol-
lowing procedure to read a sequential block of registers:
Figures 14a and 14b. Writing to the MAX8649
a) WRITING TO A SINGLE REGISTER WITH THE WRITE BYTE PROTOCOL
b) WRITING TO MULTIPLE REGISTERS
by a write bit.
pulling SDA low.
by a read bit.
register).
SDA high.
S
1
S
1
SLAVE ADDRESS
MASTER TO
SLAVE
SLAVE TO
MASTER
SLAVE ADDRESS
1.8A Step-Down Regulator with Differential
LEGEND
7
7
______________________________________________________________________________________
R/W
R/W
1
0
1
0
...
1
A
1
A
Remote Sense in 2mm x 2mm WLP
REGISTER POINTER X
REGISTER POINTER
DATA X+n-1
Read Operations
8
8
8
A
1
A
1
1
A
DATA X+n
DATA X
1) The master sends a start command.
2) The master sends the 7-bit slave address followed
3) The addressed slave asserts an acknowledge by
4) The master sends an 8-bit register pointer of the
5) The slave acknowledges the register pointer.
6) The master sends a repeated START condition.
7) The master sends the 7-bit slave address followed
8) The slave asserts an acknowledge by pulling SDA low.
9) The slave sends the 8-bit data (contents of the reg-
10) The master asserts an acknowledge by pulling SDA
11) Steps 9 and 10 are repeated for as many registers
12) The master sends a STOP condition.
DATA
8
8
8
by a write bit.
pulling SDA low.
first register in the block.
by a read bit.
ister).
low when there is more data to read, or a not
acknowledge by keeping SDA high when all data
has been read.
in the block, with the register pointer automatically
incremented each time.
1
A
1
A P
A
1
1
P
DATA X+1
NUMBER OF BITS
NUMBER OF BITS
8
1
A
...
NUMBER OF BITS
19