Datasheet

LTC2471/LTC2473
13
24713fb
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applicaTions inForMaTion
Figure 10. Start a New Conversion without Reading Old Conversion Result
Figure 8. Consecutive Reading
Figure 9. I
2
C State Diagram
SLEEP SLEEP
S PR ACK READ READ
DATA OUTPUT
CONVERSION CONVERSION
24713 F08
S R PACK
CONVERSIONDATA OUTPUT
7-BIT ADDRESS
(0010100 OR 1010100)
7-BIT ADDRESS
(0010100 OR 1010100)
24713 F09
7-BIT ADDRESS:
0010100 OR 1010100
WRITE INPUT
CONFIGURATION
(FIGURE 7)
FOR CYCLE N
I
2
C START
R/W
BIT LOW
WRITE INPUT
CONFIGURATION
(FIGURE 7)
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
SLEEP
S PR ACK READ (OPTIONAL)
DATA OUTPUT CONVERSIONCONVERSION
24713 F10
7-BIT ADDRESS
(0010100 OR 1010100)
OPERATION SEQUENCE
Continuous Read
Conversions from the LTC2471/LTC2473 can be continu
-
ously read, see Figure 8. 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 LTC2471/LTC2473 generate a NACK
signal indicating the conversion cycle is in progress. See
Figure 9 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 10. Following a valid
7-bit address, a read request (R/W) bit, and a valid ACK,
a STOP command will start a new conversion.