Datasheet
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SBAS274H − MARCH 2003 − REVISED MAY 2007
www.ti.com
29
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
CS
16
RD
D[15:0]
TMS320C5400
INT3
IOSTRB
R/W
A15
IS
U1
U2
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
CS
16
RD
D[15:0]
TMS320C5400
INT3
R/W
IS
U1
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.