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ADS7954 / about pin connections

Ryuji
Guru 20090 points
Other Parts Discussed in Thread: ADS7954
Hello,
 
Could you please let me know reccomended  pin connections of ADS7954 TSSOP PKG ?
 
(1) GPIO1~3
Should we pulled up or pulled down these pins?
If yes, please let me know recomended resistor value.
 
(2) SDO, SDI , SCLK, CS
I believe that these pins don't need pullup or pulldown.
Is my understanding correct ?
 
(3)NC pins
Should we connect to GND ?
 
Best Regards,
Ryuji Asaka
  • 0
    TI__Expert 4405 points

    Ryuji-san,

    Please see the responses for each set of pins below:

    (1) GPIO1~3

     By default, these pins are configured as inputs. If their state is not explicitly changed, a weak 1M pull down could be used on these inputs to park them to a known state. However, if the function or direction is changed (GPIO 3 supports an active low PD on the TSSOP package, for instance) care needs to be taken to ensure that the external pull resistor does not conflict with the device functionality.

     (2) SDO, SDI , SCLK, CS

     You are right. No pull-up or pull-down is required.

     (3)NC pins

     NC pins may be shorted to GND.

     Regards,

    Sandeep