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TSW14J57EVM: TRIG IN - Adjustable level

Intellectual 1485 points

Replies: 3

Views: 80

Part Number: TSW14J57EVM

hello, 

could you tell me how to change the input level of J13? I want to input 3.3V level to TRIG_IN. 

  • Guru 50820 points

    Takuma,

    For 3.3V level input signals, on switch SW7, turn on switch 4 and turn off the other three switches.

    Switch SW7 controls the voltage used by the FPGA bank that the TRIG signals are connected to. The available voltages are as follows:

    SW1 ON, SW2, SW3, SW4 OFF = 1.4V

    SW2 ON, SW1, SW3, SW4 OFF = 1.8V (default)

    SW3 ON, SW1, SW2, SW4 OFF = 2.5V

    SW4 ON, SW1, SW2, SW3 OFF = 3.0V

    Only one switch should be ON. Other values can be obtained but the user would need to swap out a resistor. See sheet 31 of the attached schematic. Care must be taken to not create a voltage that is outside the specified allowable values of the FPGA.The FPGA maximum specified input voltage for VCCIO is 3.15V

    Regards,

    Jim

    TSW14J57EVM-SCH_E.pdf

  • In reply to jim s:

    Hello Jim 

    thank you. so you cannot use the 3.3V IO into this EVM? 

    Do i need to set the VCCIO of trigger source below 3.0V, or level shifting? 

    Ito

  • In reply to Takuma Ito:

    Hi Ito
    You are correct, 3.3V IO is not possible.
    3.0V is the maximum nominal supply voltage for the Arria 10 FPGA Vccio circuitry.
    Please refer to Table 3 in the Arria 10 datasheet for the recommended operating conditions of Vccio.
    www.intel.com/.../a10_datasheet.pdf
    Because of the FPGA IO voltage limitations I recommend using an external resistor divider to reduce the voltage to an acceptable level.
    Best regards,
    Jim B

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