LTC2489 datasheet(13/24 Pages) LINER

13 / 24 page

LTC2489

2489f

Figure 3a. Timing Diagram for Reading from the LTC2489

SLEEP

DATA OUTPUT

ACK BY

LTC2489

ACK BY

MASTER

ALWAYS LOW

START BY

MASTER

NAK BY

MASTER

LSB

MSB

SIG

D23

…

7-BIT

ADDRESS

2489 F03a

SCL

SDA

ACK BY

LTC2489

ACK BY

LTC2489

NAK BY

LTC2489

START BY

MASTER

SGL ODD

SCL

SDA

…8

7-BIT ADDRESS

2489 F03b

SLEEP

DATA INPUT

Figure 3b. Timing Diagram for Writing to the LTC2489

The ﬁrst input bit (SGL) following the 101 sequence de-

termines if the input selection is differential (SGL = 0) or

single-ended (SGL = 1). For SGL = 0, two adjacent chan-

nels can be selected to form a differential input. For SGL

= 1, one of 4 channels is selected as the positive input.

The negative input is COM for all single-ended operations.

The remaining four bits (ODD, A2, A1, A0) determine

which channel(s) is/are selected and the polarity (for a

differential input).

Initiating a New Conversion

When the LTC2489 ﬁnishes a conversion, it automatically

enters the sleep state. Once in the sleep state, the device is

ready for a read operation. After the device acknowledges

a read request, the device exits the sleep state and enters

the data output state. The data output state concludes

and the LTC2489 starts a new conversion once a Stop

condition is issued by the master or all 24 bits of data are

read out of the device.

During the data read cycle, a Stop command may be issued

by the master controller in order to start a new conversion

and abort the data transfer. This Stop command must be

issued during the ninth clock cycle of a byte read when

the bus is free (the ACK/NAK cycle).

LTC2489 Address

The LTC2489 has two address pins (CA0, CA1). Each may

be tied high, low, or left ﬂoating enabling one of 9 possible

addresses (see Table 4).

In addition to the conﬁgurable addresses listed in Table 4,

the LTC2489 also contains a global address (1110111)

which may be used for synchronizing multiple LTC2489s

or other LTC24XX delta-sigma I2C devices, (See Syn-

chronizing Multiple LTC2489s with Global Address Call

section).

APPLICATIONS INFORMATION

LTC2489 датащи(PDF) 13 Page - Linear Technology

LTC2489 датащи(HTML) 13 Page - Linear Technology

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24

датащи скачать

ссылки URL