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Digital Interface

3

Digital Interface

3.1

Serial Data Interface

The ADS7953EVM 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 P2. 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 4 describes the P2 serial interface pins.

Table 4. Serial Interface Pins

Pin No.

Pin Name

Signal Name

I/O Type

Pullup

Function

P2.1

CNTL

CS

In

None

Controls CS input, Jumper

option with P2.7 via W5

P2.2

GPIO0

GPIO2

In/Out

High

GPIO

P2.3

CLKX

SCLK

In

None

ADS79xx serial clock

P2.4

DGND

DGND

NA

None

Digital Ground

P2.5

CLKR

CLKR

Out

None

serial clock return to DSP

P2.6

GPIO1

GPIO3

In/Out

High

GPIO

P2.7

FSX

FSYNC Xmit

In

None

Controls CS input, Jumper

option with P2.1 via W5

P2.8

GPIO2

Unused

NA

NA

P2.9

FSR

FSYNC rtrn

Out

None

P2.10

DGND

DGND

NA

None

Digital Ground

P2.11

DX

DIN

In

None

ADS79xx SPI data in

P2.12

GPIO3

Unused

NA

NA

P2.13

DR

DOUT

Out

None

ADS79xx data out

P2.14

GPIO4

Unused

NA

NA

P2.15

/INT

GPIO0/GPIO1

Out

None

Hi/Lo Alarm Interrupt options

P2.16

SCL

SCL

I

n/a

I

P2.17

TOUT

Unused

NA

NA

P2.18

DGND

DGND

NA

None

Digital Ground

P2.19

GPIO5

Unused

NA

NA

P2.20

SDA

SDA

I

n/a

I

3.2

Data Output

All output data communications are directed through DOUT. The data from all 16 channels can be

observed on the DOUT pin. This is the signal that is used by the ADS7953EVM-PDK to read back and

display all the channel data via the ADCPro software.

5

SLAU262C

– January 2009 – Revised May 2011

ADS79xxEVM and ADS79xxEVM-PDK

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