LTC2461/LTC2463

13

24613f

Figure 7b. Start a New Conversion without Reading Old Conversion Result

SLEEP

SP

R

ACK READ (OPTIONAL)

DATA OUTPUT

CONVERSION

CONVERSION

24613 F07a

7-BIT ADDRESS

(0010100 OR 1010100)

APPLICATIONS INFORMATION

Figure 6. Consecutive Reading

SLEEP

SLEEP

SP

R

ACK

READ

READ

DATA OUTPUT

CONVERSION

CONVERSION

24613 F06

S

RP

ACK

CONVERSION

DATA OUTPUT

7-BIT ADDRESS

(0010100 OR 1010100)

7-BIT ADDRESS

(0010100 OR 1010100)

the next conversion is complete. It will remain powered

down until a valid address is acknowledged. The reference

startup time is approximately 12ms. In order to ensure a

stable reference for the following conversions, either the

data input/output time should be delayed 12ms after an

address acknowledge or the first conversion following a

reference start up should be discarded.

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.

24613 F07b

7-BIT ADDRESS:

0010100 OR 1010100

WRITE INPUT

CONFIGURATION

(FIGURE 5b)

FOR CYCLE N

R/W

BIT LOW

WRITE INPUT

CONFIGURATION

(FIGURE 5b)

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