Datasheet

LTC2461/LTC2463
12
24613fa
Figure 7b. Start a New Conversion without Reading Old Conversion Result
Figure 7c. Synchronize the LTC2461/LTC2463 with the Global Address Call
SLEEP
S PR ACK READ (OPTIONAL)
DATA OUTPUT CONVERSIONCONVERSION
24613 F07a
7-BIT ADDRESS
(0010100 OR 1010100)
APPLICATIONS INFORMATION
Figure 6. Consecutive Reading
SLEEP SLEEP
S PR ACK READ READ
DATA OUTPUT
CONVERSION CONVERSION
24613 F06
S R PACK
CONVERSIONDATA OUTPUT
7-BIT ADDRESS
(0010100 OR 1010100)
7-BIT ADDRESS
(0010100 OR 1010100)
OPERATION SEQUENCE
Continuous Read
Conversions from the LTC2461/LTC2463 can be continu-
ously read, see Figure 6. The R/W is 1 for a read. At the
end of a read operation, a new conversion automatically
begins. At the conclusion of the conversion cycle, the next
result may be read using the method described above. If
the conversion cycle is not complete and a valid address
selects the device, the LTC2461/LTC2463 generate a NAK
signal indicating the conversion cycle is in progress. See
Figure 7a for an example state diagram.
Discarding a Conversion Result and Initiating a New
Conversion
It is possible to start a new conversion without reading
the old result, as shown in Figure 7b. Following a valid
7-bit address, a read request (R/W) bit, and a valid ACK,
a STOP command will start a new conversion.
Synchronizing the LTC2461/LTC2463 with the
Global Address Call
The LTC2461/LTC2463 can also be synchronized with
the global address call (see Figure 7c). To achieve this,
the LTC2461/LTC2463 must first have completed the
Figure 7a. I
2
C State Diagram
24613 F07b
7-BIT ADDRESS:
0010100 OR 1010100
WRITE INPUT
CONFIGURATION
(FIGURE 5b)
FOR CYCLE N
I
2
C START
R/W
BIT LOW
WRITE INPUT
CONFIGURATION
(FIGURE 5b)
I
2
C STOP CONVERT
CONVERSION
FINISHED
ACK
ACK
ACK
NAK
I
2
C (REPEAT) START
R/W
BIT LOW
7-BIT ADDRESS:
0010100 OR 1010100
I
2
C START
R/W
BIT HIGH
READ DATA FROM
CYCLE N-1
I
2
C STOP CONVERT
CONVERSION
FINISHED
7-BIT ADDRESS:
0010100 OR 1010100
GLOBAL ADDRESS
(1110111)
SLEEP
CONVERSION
S W ACK WRITE (OPTIONAL) P
24613 F07c
DATA INPUT