LTC2489 datasheet(14/24 Pages) LINER

14 / 24 page

LTC2489

2489f

Operation Sequence

The LTC2489 acts as a transmitter or receiver, as shown

in Figure 4. The device may be programmed to select

an input channel, differential or single-ended mode, and

channel polarity.

Table 4. Address Assignment

CA1

CA0

ADDRESS

LOW

0010100

LOW

HIGH

0010110

LOW

FLOAT

0010101

HIGH

LOW

0100110

HIGH

0110100

HIGH

FLOAT

0100111

FLOAT

LOW

0010111

FLOAT

HIGH

0100101

FLOAT

0100100

Continuous Read

In applications where the input channel does not need to

change for each cycle, the conversion can be continuously

performed and read without a write cycle (see Figure 5).

The input channel remains unchanged from the last

value written into the device. If the device has not been

written to since power up, the channel selection is set to

the default value of CH0 = IN+, CH1 = IN–. 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 concluded and a valid address

selects the device, the LTC2489 generates a NAK signal

indicating the conversion cycle is in progress.

Continuous Read/Write

Once the conversion cycle is concluded, the LTC2489 can

be written to and then read from using the Repeated Start

(Sr) command.

APPLICATIONS INFORMATION

ACK

DATA

DATA TRANSFERRING

7-BIT ADDRESS

R/W

2489 F04

CONVERSION

SLEEP

DATA INPUT/OUTPUT

7-BIT ADDRESS

ACK

READ

2489 F05

CONVERSION

SLEEP

DATA OUTPUT

DATA INPUT

SLEEP

Figure 4. Conversion Sequence

Figure 5. Consecutive Reading with the Same Input/Conﬁguration

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