Datasheet

Digital Interface

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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 http://www.samtec.com or call 1-800-SAMTEC-9 for a variety of mating

connector options. Table 2 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

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

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 ADS8331

and ADS8332 product data sheet for complete details on these pins.

ADS833xEVM User's Guide SBAU176A– August 2010– Revised May 2011

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