LTC1594CS datasheet(13/24 Pages) LINER

13 / 24 page

LTC1594/LTC1598

15948fb

APPLICATIONS INFORMATION

Operation with DIN and DOUT Tied Together

The LTC1594/LTC1598 can be operated with DIN and

DOUT tied together. This eliminates one of the lines

required to communicate to the microprocessor (MPU).

Data is transmitted in both directions on a single wire.

The processor pin connected to this data line should be

configurable as either an input or an output. The LTC1594/

LTC1598 will take control of the data line after CS falling

and before the 6th falling CLK while the processor takes

control of the data line when CS is high (see Figure 3).

Therefore the processor port line must be switched to an

input with CS being low to avoid a conflict.

Separate Chip Selects for MUX and ADC

The LTC1594/LTC1598 provide separate chip selects,

CSMUX and CSADC, to control MUX and ADC separately.

This feature not only provides the flexibility to select a

particular channel once for multiple conversions (see

Figure 4) but also maximizes the sample rate up to

20ksps (see Figure 5).

Figure 4. Select Certain Channel Once for Mulitple Conversions

CLK

CSADC

CSMUX

B10

B11

Hi-Z

DOUT

CH0 TO

CH7

DIN

tCONV

Hi-Z

tsuCS

NULL

BIT

tSMPL

tON

B10

B11

Hi-Z

tCONV

tsuCS

NULL

BIT

tSMPL

ADCIN =

MUXOUT

COM = GND

1594 TD01

DON’T CARE

456

CLK

DATA (DIN/DOUT)

B11

B10

•••

LTC1594/LTC1598 CONTROLS DATA LINE AND SENDS

A/D RESULT BACK TO MPU

MPU CONTROLS DATA LINE AND SENDS

MUX ADDRESS TO LTC1594/LTC1598

PROCESSOR MUST RELEASE DATA

LINE AFTER CS FALLING AND

BEFORE THE 6TH FALLING CLK

LTC1594/LTC1598 TAKES CONTROL OF DATA

LINE AFTER CS FALLING AND BEFORE THE

6TH FALLING CLK

1594/98 F03

tsuCS

Figure 3. LTC1594/LTC1598 Operation with DIN and DOUT Tied Together

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