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RF430FRL152H: Questions about IC specifications

Chase Jeong
Genius 4660 points
Part Number: RF430FRL152H

Hello TI experts,

now my customer considers using RF430FRH152H for their product. they have some questions about specification.

1. Can you explain more about VDDSW? I cannot find detailed information on datasheet.

2. If I connect 1.5V battery to pin4, can I get 3V on VDD2X in any situation? or should I satisfy some condition to get 3V?

3. Can I use VDDH for the input of external LDO? if yes, what is the current limitattion?

4. Can I apply external 3V in VDD2X?

5. what is the meaning of reference resistor? (datasheet p42, 100Kohm R2)

6. on page 42, there is the values of some passive components. can I use those values directly to our system? or should we change the values depend on the situation? (ex. the layout, antenna design, etc)

Please check those issues. Thanks.

Best regards,

Chase

  • 0
    TI__Mastermind 18265 points

    Hello Chase,

    a lot of questions but I think they can all be answered.

    1. VDDS is the "switched" VDD. It will be switch automatic between the RF or the battery supply. For a better understanding the block diagram at  page 44 of the "Technical Reference Manual" can help.

    http://www.ti.com/lit/ug/slau506/slau506.pdf

    2. This question is answered in the "RF430FRL152H FAQ" chapter 2.4:

    http://www.ti.com/lit/pdf/sloa247

    3. yes, VDDH can be used as input for an LDO

    4. no, external voltage can not be applied to VDD2X.

    5. The reference resistor is needed for the temperature measurement with the thermistor. An internal constant current source supplies a current between 2µA and 3µA. To calculate the exact temperature the reference resistor is used to measure this current. See also the FAQ chapter 4.1.

    6. These values can used directly with the exception of L1 and C1 which are the antenna and the resonance capacitor. This has to be adapted to the system. More Information to this topic can be found in the "Antenna Design Guide":

    http://www.ti.com/lit/pdf/sloa217

    Hope that helps.

    Best Regards,

    Helfried