Digital Interface
3
Digital Interface
3.1
Serial Data Interface
The ADS833xEVM is designed to easily interface with multiple control platforms. Samtec part numbers
SSW-110-22-F-D-VS-K and TSM-110-01-T-DV-P provide a convenient 10-pin, dual-row, header/socket
combination at J5. This header/socket provides access to the digital control and serial data pins of the
ADC. Consult Samtec at
or call 1-800-SAMTEC-9 for a variety of mating
connector options.
describes the J2 serial interface pins.
Table 2. J2: Serial Interface Pins
Pin No.
Pin Name
Signal Name
I/O Type
Pull-Up
Function
J2.1
CNTL
CS/FS
In
None
CS/FS signal (see
jumper JP4)
J2.2
GPIO0
Unused
—
—
J2.3
CLKX
SCLK
In
None
ADS833x SPI clock
J2.4
DGND
DGND
In/Out
None
Digital ground
J2.5
CLKR
SCLK
In
None
ADS833x SPI clock
J2.6
GPIO1
Unused
—
—
J2.7
FSX
CS/FS
In
None
CS/FS signal (see
jumper JP4)
J2.8
GPIO2
Unused
—
—
J2.9
FSR
CS/FS
In
None
CS/FS signal (see
jumper JP4)
J2.10
DGND
DGND
In/Out
None
Digital ground
J2.11
DX
DIN
In
None
ADS833x SPI data in
J2.12
GPIO3
Unused
—
—
J2.13
DR
DOUT
Out
None
ADS833x SPI data out
J2.14
GPIO4
Unused
—
—
J2.15
INT
EOC/INT/CDI
In/Out
None
Status output/
Daisy-chain input
J2.16
SCL
SCL
In/Out
High
I
2
C
™
clock for
EEPROM
J2.17
TOUT
CONVST
In
High
Convert start signal
J2.18
DGND
DGND
In/Out
None
Digital ground
J2.19
GPIO5
RESET
In
High
Reset signal, active low
J2.20
SDA
SDA
In/Out
High
I
2
C data for EEPROM
Note that many of the pins on J2 are connected directly to the ADS8331/32. Some of the control signals
on the EVM may have weak pull-up resistors to provide default settings for the pins. See the
and ADS8332 product data sheet
for complete details on these pins.
4
ADS833xEVM User
'
s Guide
SBAU176A
–
August 2010
–
Revised May 2011
Copyright
©
2010
–
2011, Texas Instruments Incorporated
