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SBAS274E − MARCH 2003 − REVISED JUNE 2004
INTERFACING THE ADS1605 TO THE
TMS320C5400
INTERFACING THE ADS1606 TO THE
TMS320C5400
Figure 30 illustrates how to connect the ADS1605 to the
TMS320C5400 DSP. The processor controls the reading
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 output bus is directly connected to the
TMS320C5400 data bus. The data ready output from the
ADS1605, DRDY, drives interrupt INT3 on 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.
ADS1606
TMS320C5400
16
DOUT[15:0]
D[15:0]
DRDY
CS
INT3
ADS1605
TMS320C5400
16
DOUT[15:0]
D[15:0]
R/W
IS
U1
RD
DRDY
CS
INT3
IOSTRB
A15
U2
U1
R/W
IS
Figure 31. ADS1606—TMS320C5400 Interface
Connection
RD
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.
Figure 30. ADS1605—TMS320C5400 Interface
Connection
29
BB [ BURR-BROWN CORPORATION ]
