ltc4151 Linear Technology Corporation, ltc4151 Datasheet - Page 9

• Manufacturer Part Number: ltc4151
• Description: High Voltage I2c Current And Voltage Monitor
• Manufacturer: Linear Technology Corporation

APPLICATIONS INFORMATION
I
The LTC4151/LTC4151-1 feature an I
terface to provide access to six ADC data registers and
a control register for monitoring the measured voltages.
Figure 2 shows a general data transfer format using the
I
devices and support SMBus Read Byte, Write Byte, Read
Word and Write Word commands. The devices also sup-
port Read Page and Write Page commands that allow one
to read or write more than two bytes of data. When using
2
2
S
S
C Interface
C. The LTC4151 and LTC4151-1 are read-write slave
1 1 0 a3:a0
FROM MASTER TO SLAVE
FROM SLAVE TO MASTER
1 1 0 a3:a0
ADDRESS
ADDRESS
Figure 5. LTC4151 Serial Bus SDA Write Page Protocol
Figure 3. LTC4151 Serial Bus SDA Write Byte Protocol
SDA
SCL
W
W
0
0
A
A
0
0
CONDITION
START
X X X X X b2:b0
X X X X X b2:b0
S
COMMAND
COMMAND
A: ACKNOWLEDGE (LOW)
A: NOT ACKNOWLEDGE (HIGH)
R: READ BIT (HIGH)
S
ADDRESS
a6 - a0
1 - 7
1 1 0 a3:a0
ADDRESS
A
A
0
0
S
b7:b0
b7:b0
DATA
DATA
1 1 0 a3:a0
ADDRESS
W
A P
0
A
0
Figure 7. LTC4151 Serial Bus SDA Read Word Protocol
0
Figure 8. LTC4151 Serial Bus SDA Read Page Protocol
R/W
8
A
0
DATA
b7:b0
2
41511 F03
C-compatible in-
W
X X X X X b2:b0
0
COMMAND
Figure 2. General Data Transfer over I
A
0
A
0
ACK
W: WRITE BIT (LOW)
S: START CONDITION
P: STOP CONDITION
9
X X X X X b2:b0
...
...
COMMAND
b7:b0
DATA
A
0
1 - 7
S
41511 F05
b7 - b0
A P
0
DATA
1 1 0 a3:a0 1 0
ADDRESS
A
0
S
1 1 0 a3:a0 1 0
the Read Page and Write Page commands, the host need
only to issue an initial register address and the internal
register address pointer automatically increments by 1
after each byte of data is read or written. After the register
address reaches 06h, it will be reset to 00h and continue
the increment. Upon a Stop condition, the register address
is reset to 00h. If desired, the Read Page and Write Page
support can be disabled by clearing control register bit
G3. The data formats for the above commands are shown
in Figures 3 to 8.
ADDRESS
8
Figure 4. LTC4151 Serial Bus SDA Write Word Protocol
S
R A
S
Figure 6. LTC4151 Serial Bus SDA Read Byte Protocol
1 1 0 a3:a0
ADDRESS
1 1 0 a3:a0
ADDRESS
ACK
b7:b0
DATA
R A
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DATA
b7:b0
A
0
2
W
0
C
W
b7:b0
DATA
0
A
0
LTC4151/LTC4151-1
1 - 7
A
0
A
0
X X X X X b2:b0
DATA
b7:b0
X X X X X b2:b0
b7 - b0
COMMAND
DATA
...
COMMAND
...
41511 F07
A P
1
b7:b0
DATA
8
41511 F08
A P
A
1
0
A
0
S
ACK
b7:b0
9
DATA
1 1 0 a3:a0 1 0
ADDRESS
A
0
CONDITION
b7:b0
DATA
STOP
R A
41511 F02
P
41511 F04
A P
0
DATA
b7:b0 1
41511 F06
A P
41511f
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