LTC1417IGN datasheet(23/32 Pages) LINER

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LTC1417

TYPICAL APPLICATIONS

Figure 21 shows the connections necessary for interfacing

the LTC1417 and LTC1391 8-channel signal acquisition

system to an SPI port. With the sample software routine

shown in Listing A, the SPI uses MOSI to send serial data

to the LTC1391 8-channel multiplexer, selecting one of

eight MUX channels.

While data is sent to the LTC1391, SPI uses MISO to

retrieve conversion data from the LTC1417. After the data

transfer is complete, the conversion start signal is sent to

the LTC1417. The end of conversion is signaled by a logic

high on the BUSY output. When this occurs, data is

exchanged between the LTC1417/LTC1391 and the

controller.

The timing diagram in Figure 22 shows the relation be-

tween MUX channel selection data and the conversion

data that are simultaneously exchanged. There is a two

conversion delay between the MUX data selects a given

channel and when that channel’s data is retrieved.

Figure 21. 0V to 4.096V, 8-Channel Data Acquisition System Configured

for Control and Data Retrieval by a 68HC11

µC. Code is Shown in Listing A

1417 F21

µF

LTC1417

PORT C, BIT 7

PORT C, BIT 0

MISO

MC68HC11

CLK

MOSI

AIN

–

VREF

REFCOMP

AGND

EXTCLKIN

SCLK

CLKOUT

VDD

VSS

BUSY

CONVST

SHDN

DGND

DOUT

LTC1391

V +

V –

DOUT

DIN

CLK

DGND

IN1

IN2

IN3

IN4

IN5

IN6

IN7

IN8

0.1

µF

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