ADS1606IPAPR datasheet(29/39 Pages) TI2

29 / 39 page

ADS1605

ADS1606

SBAS274H − MARCH 2003 − REVISED MAY 2007

www.ti.com

INTERFACING THE ADS1605 TO THE

TMS320C5400

Figure 30 illustrates how to connect the ADS1605 to the

TMS320C5400 DSP. The processor controls the read-

ing using the outputs R/W and IS. The I/O space select

signal (IS) is optional and is used to prevent the

ADS1605 RD input from being strobed when the DSP

is accessing other external memory spaces (address or

data). This can help reduce the possibility of digital

noise coupling into the ADS1605. When not using this

signal, replace NAND gate U1 with an inverter between

R/W and RD. Two signals, IOSTRB and A15, combine

using NAND gate U2 to select the ADS1605. If there are

no additional devices connected to the TMS320C5400

I/O space, U2 can be eliminated.

Simply connect

IOSTRB directly to CS. The ADS1605 16-bit data out-

put bus is directly connected to the TMS320C5400 data

bus. The data ready output from the ADS1605, DRDY,

drives interrupt INT3 on the TMS320C5400.

DOUT[15:0]

ADS1605

DRDY

D[15:0]

TMS320C5400

INT3

IOSTRB

R/W

A15

Figure 30. ADS1605—TMS320C5400 Interface

Connection

INTERFACING THE ADS1606 TO THE

TMS320C5400

Figure 31 illustrates how to directly connect the

ADS1606 to the TMS320C5400 DSP. The processor

controls reading using outputs R/W and IS. The

ADS1606 is permanently selected by grounding the CS

pin. If there are any additional devices connected to

theTMS320C5400 I/O space, address decode logic will

be required between the ADC and the DSP to prevent

data bus contention and ensure only one device at a

time is selected. The ADS1606 16-bit data output bus

is directly connected to the TMS320C5400 data bus.

The data ready output from the ADS1606, DRDY,

drives interrupt INT3 on the TMS320C5400.

DOUT[15:0]

ADS1606

DRDY

D[15:0]

TMS320C5400

INT3

R/W

Figure 31. ADS1606—TMS320C5400 Interface

Connection

Code Composer Studio, available from TI, provides

support for interfacing TI DSPs through a collection of

data converter plugins. Check the TI website, located

at www.ti.com/sc/dcplug−in, for the latest information

on ADS1605/6 support.

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