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PGA309: Information about PRG pin

Dewanshi Roy
Prodigy 10 points
Part Number: PGA309


Hi

If PRG is configured as one-wire UART interface, what will be the voltage and current levels of PRG pin?

Regards

Dewanshi

  • +1
    TI__Guru 55466 points

    Hi Dewanshi,

    The PGA309 datasheet specifies the PRG logic input levels:

    It accepts a 0.2*VSD (maximum) for logic input low, and 0.7*VSD (minimum) for logic input high; where VSD  is the digital supply voltage.  The allowed digital supply voltage range is 2.7V to 5.5V.

    The PRG Output is an open drain, and specifies a low level of 0.4V maximum while sinking 5mA.

    Thank you and Regards,

    Luis

  • 0 in reply to Luis Chioye
    TI__Guru 55466 points

    HI Dewanshi,

    The PGA309 User Guide provides a detailed discussion about the PGA309 PRG pin configuration and circuit configurations/protection.

    Section 4.10 of the PGA309 User Guide (p.88) documents the One-Wire Operation with PRG Connected to VOUT. Pages 88-90 discuss the circuit, PGA309 register configuration that allows the One-Wire interface pin (PRG) to be tied directly to the PGA309 output pin (VOUT).

    Section 4.11 of the PGA309 User Guide (p.91) discusses four-wire sensor modules, where the PRG is connected separately from VOUT.  Pages 91-93 discuss the PRG ESD and overstress protection, and Figure 4-21 shows an example of external protection circuits EMI/RFI filtering and ESD protection for the PRG pin on the four-wire module.

    Thank you and Regards,

    Luis