Texas Instruments ADS7854EVM-PDK, Руководство пользователя, Страница: 7 / 35

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Digital Interface
3 Digital Interface
Socket strip connector J6 provides the digital I/O connections between the ADSxx54EVM board and the
SDCC board.
Table 4 Summarizes the pinout for connector J6.
Table 4. Connector J6 Pinout
Pin Number Signal Description
J6.2, J6.10, J6.15, J6.16,
GND Ground connections
J6.18
J6.4 EVM PRESENT EVM present, active low
I
2
C bus; used only used to program the U7
J6.11, J6.12 I
2
C™ bus
EEPROM on the EVM board
J6.13 DVDD 3.3-V digital supply from SDCC controller board
J6.34 CS Chip select, active low
J6.36 SCLK Serial interface clock
J6.38 SDI Serial data input
J6.40 SDO_A Serial data output for channel A
J6.42 SDO_B Serial data output for channel B
3.1 Serial Peripheral Interface (SPI)
The ADSxx54 digital output is available in SPI-compatible format, which makes interfacing with
microprocessors, digital signal processors (DSPs), and FPGAs easy. The ADSxx54EVM offers 47-
Ω
resistors between the SPI signals and connector J6 to aid with signal integrity. Typically, in high-speed
SPI communication, fast signal edges can cause overshoot; these 47-
Ω resistors slow down the signal
edges in order to minimize signal overshoot.
3.2 I
2
C Bus for Onboard EEPROM
The ADSxx54EVM has an I
2
C bus to communicate with the onboard EEPROM that records the board
name and assembly date. It is not used in any form by the ADSxx54 converter.
7 SBAU209 – April 2014 ADS8354EVM-PDK and ADS7854EVM-PDK
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