LTC4151-1 View Datasheet(PDF) - Linear Technology
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LTC4151-1 Datasheet PDF : 16 Pages
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LTC4151/LTC4151-1
APPLICATIONS INFORMATION
I2C Interface
The LTC4151/LTC4151-1 feature an I2C-compatible in-
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
I2C. The LTC4151 and LTC4151-1 are read-write slave
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
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.
SDA
a6 - a0
b7 - b0
b7 - b0
SCL
1-7
8
9
1-7
8
9
1-7
8
9
S
P
START
ADDRESS
R/W
ACK
DATA
ACK
DATA
CONDITION
Figure 2. General Data Transfer over I2C
ACK
STOP
CONDITION
41511 F02
S ADDRESS W A COMMAND A DATA A P
1 1 0 a3:a0 0 0 X X X X X b2:b0 0 b7:b0 0
41511 F03
FROM MASTER TO SLAVE
FROM SLAVE TO MASTER
A: ACKNOWLEDGE (LOW)
W: WRITE BIT (LOW)
A: NOT ACKNOWLEDGE (HIGH) S: START CONDITION
R: READ BIT (HIGH)
P: STOP CONDITION
Figure 3. LTC4151 Serial Bus SDA Write Byte Protocol
S ADDRESS W A COMMAND A DATA A DATA A P
1 1 0 a3:a0 0 0 X X X X X b2:b0 0 b7:b0 0 b7:b0 0
41511 F04
Figure 4. LTC4151 Serial Bus SDA Write Word Protocol
S ADDRESS W A COMMAND A DATA A DATA A ... DATA A P
1 1 0 a3:a0 0 0 X X X X X b2:b0 0 b7:b0 0 b7:b0 0 ... b7:b0 0
41511 F05
Figure 5. LTC4151 Serial Bus SDA Write Page Protocol
S ADDRESS W A COMMAND A S ADDRESS R A DATA A P
1 1 0 a3:a0 0 0 X X X X X b2:b0 0 1 1 0 a3:a0 1 0 b7:b0 1
41511 F06
Figure 6. LTC4151 Serial Bus SDA Read Byte Protocol
S ADDRESS W A COMMAND A S ADDRESS R A DATA A DATA A P
1 1 0 a3:a0 0 0 X X X X X b2:b0 0 1 1 0 a3:a0 1 0 b7:b0 0 b7:b0 1
41511 F07
Figure 7. LTC4151 Serial Bus SDA Read Word Protocol
S ADDRESS W A COMMAND A S ADDRESS R A DATA A DATA ...
1 1 0 a3:a0 0 0 X X X X X b2:b0 0 1 1 0 a3:a0 1 0 b7:b0 0 b7:b0 ...
Figure 8. LTC4151 Serial Bus SDA Read Page Protocol
DATA A P
b7:b0 1
41511 F08
41511fa
9
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