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ADS1235EVM: 4-wire AC excitation

Yasushi Fujiwara
Genius 12425 points
Part Number: ADS1235EVM
Other Parts Discussed in Thread: ADS1235,

Hello Experts,

Would you review a register setting for 4-wire AC excitation?

ads1235EVM data_test_4-wire_20230410.txt 
[ADS1235 Register Settings]
ID             	C0
STATUS         	01
MODE0          	24
MODE1          	61
MODE2          	00
MODE3          	0C
REF            	05
OFCAL0         	00
OFCAL1         	00
OFCAL2         	00
FSCAL0         	00
FSCAL1         	00
FSCAL2         	40
RESERVE0       	FF
RESERVE1       	00
RESERVE2       	00
PGA            	00
INPMUX         	87


Best Regards,
Fujiwara

  • 0
    TI__Mastermind 40331 points

    Hi Yasushi Fujiwara,

    Can you please post the customer name in the "Notes" section of the Thread Tracking Toolkit. This can only be seen by TI employees

    The only registers I see that are not default are:

    • MODE1 = 61h = 4-wire AC bridge excitation mode
    • MODE3 = 0Ch = GPIO2 and GPIO3 are set to 1
    • INPMUX = 87h = MUXP is AIN5 and MUXN is AIN4

    Some things to note about this configuration

    • You have not set the GPIOs to be connected to the AINx pins (MODE2 register, bits 7:4). Therefore, the GPIOs will toggle but you could not use them for anything

    Are you / the customer using their own board, or the ADS1235EVM? Note that the ADS1235 only provides the controls signals for external switches, not the switches themselves

    -Bryan