Datasheet

Digital Interface

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3 Digital Interface

The DAC7718EVM is a serial input data converter. The evaluation module is designed for interfacing to

multiple control platforms.

3.1 Serial Data Interface

Samtec part numbers SSW-110-22-F-D-VS-K and TSM-110-01-T-DV-P provide a 10-pin, dual-row,

header/socket combination at J2. This header/socket provides access to the digital control and serial data

pins from both J2A (top side) and J2B (bottom side) of the connector. The additional GPIO pins are

connected to the JP13 header. Consult Samtec at http://www.samtec.com or call 1-800-SAMTEC-9 for a

variety of mating connector options.

Table 3 describes the serial interface pins.

Table 3. J2: Serial Interface Pins

Pin No. Signal Name I/O Type Pull-Up Function

J2.1, J2.7, J2.9 CS In None SPI bus chip select; pins

are shorted together

J2.2 CLR In High Level trigger clear pin

J2.3, J2.5 SCLK In None DAC7718 SPI clock; pins

are shorted together

J2.4 DGND In/Out None Digital ground

J2.6 RESET In High Input register reset

J2.8 BTC/USB In High Data format for DAC input

J2.10 DGND In/Out None Digital ground

J2.11 SDO/SDI In/Out None DAC7718 SPI data in/out

J2.12 WAKEUP In High Wake up device from sleep

mode

J2.13 Unused — — —

J2.14 GPIO0 In/Out High DAC7718 GPIO0 signal

J2.15 LDAC1 In High GPIO signal to control

LDAC for DAC output latch

update

J2.16 Unused — — —

J2.17 LDAC2 In High Alternate GPIO signal to

control LDAC for DAC

output latch update

J2.18 DGND In/Out None Digital ground

J2.19 GPIO1 In/Out High DAC7718 GPIO1 signal

J2.20 Unused — — —

DAC7718EVM SBAU165A–February 2010–Revised May 2011

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