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ADS124S08: About handling unconnected pins

KIYOSHI KOGURE
Prodigy 160 points
Part Number: ADS124S08


Inquiry
The pins in red below are not connected.
Please tell me how to dispose of unused pins.
・Is it okay to leave it open?
・GND connection?
·others

Pin NAME connection
1 AINCOM Noconnected
2 AIN5 RTD temperature sensor
3 AIN4 RTD temperature sensor
4 AIN3 Noconnected
5 AIN2 RTD temperature sensor
6 AIN1 RTD temperature sensor
7 AIN0 RTD temperature sensor
8 START/SYNC CPU
9 CS CPU
10 DIN CPU
11 SCLK CPU
12 DOUT/DRDY CPU
13 DRDY CPU
14 DGND GND
15 IOVDD 3.3V
16 DVDD 3.3V
17 CLK GND
18 RESET CPU
19 GPIO3/AIN11 Noconnected
20 GPIO2/AIN10 Noconnected
21 GPIO1/AIN9 Noconnected
22 GPIO0/AIN8 Noconnected
23 REFOUT 1uF
24 REFCOM GND
25 NC NC
26 AVDD ５V
27 AVSS GND
28 AVSS-SW GND
29 REFN0 Noconnected
30 REFP0 Noconnected
31 REFN1/AIN7 RTD temperature sensor
32 REFP1/AIN6 RTD temperature sensor
  • 0
    TI__Guru** 113765 points

    Hi Kiyoshi Kogure,

    The answer to your question is in the ADS124S08 datasheet in section 10.1.5 Unused Inputs and Outputs.

    So you can leave the pins unconnected as you show as long as the dual purpose pins (AIN8-AIN11) for GPIO are left as analog input pins and not selected as GPIO inputs.

    Best regards,

    Bob B