LTC2471/LTC2473

13

24713f

APPLICATIONS INFORMATION

Figure 10. Start a New Conversion without Reading Old Conversion Result

Figure 8. Consecutive Reading

SLEEP

SLEEP

SP

R

ACK

READ

READ

DATA OUTPUT

CONVERSION

CONVERSION

24713 F08

S

RP

ACK

CONVERSION

DATA 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

R/W

BIT LOW

WRITE INPUT

CONFIGURATION

(FIGURE 7)

CONVERT

CONVERSION

FINISHED

ACK

ACK

ACK

NAK

R/W

BIT LOW

7-BIT ADDRESS:

0010100 OR 1010100

R/W

BIT HIGH

READ DATA FROM

CYCLE N-1

CONVERT

CONVERSION

FINISHED

7-BIT ADDRESS:

0010100 OR 1010100

SLEEP

SP

R

ACK READ (OPTIONAL)

DATA OUTPUT

CONVERSION

CONVERSION

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 NAK

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.