Datasheet

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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
2
C ™ n/a I
2
C clock
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
2
C n/a I
2
C data
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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