SLOA247C July   2017  – March 2019 RF430FRL152H , RF430FRL153H , RF430FRL154H

 

  1.   Frequently asked questions for RF430FRL15xH devices
    1.     Trademarks
    2. 1 General Questions
      1. 1.1 What is the RF430FRL15xH?
      2. 1.2 What are the variations of the RF430FRL15xH?
      3. 1.3 What is the recommended hardware and software to evaluate the RF430FRL15xH?
      4. 1.4 I cannot purchase a TRF7970AEVM. How do I use the RF430FRL152HEVM GUI?
      5. 1.5 Does the RF430FRL15xH support NDEF messages?
      6. 1.6 What RF communication range can be expected with the RF430FRL15xH?
    3. 2 Hardware and Design Questions
      1. 2.1  What TI Designs are available for the RF430FRL152H?
      2. 2.2  How do I design and tune an antenna to 13.56 MHz for my application?
      3. 2.3  Why are the various external components required?
      4. 2.4  How much power can be sourced from the RF430FRL15xH?
      5. 2.5  What battery can be used with the RF430FRL15xH?
      6. 2.6  How should the switches be set on the RF430FRL152HEVM?
      7. 2.7  How can an external sensor be connected on the RF430FRL152HEVM?
      8. 2.8  What kinds of analog sensors can be used?
      9. 2.9  How can a digital sensor be used?
      10. 2.10 How can the internal temperature sensor be used?
      11. 2.11 What are the settings to program the RF430FRL152HEVM with an MSP-FET tool?
      12. 2.12 Is there a low-voltage programmer suitable for the RF430FRL15xH?
    4. 3 Software Questions
      1. 3.1 How is the RF430FRL15xH ROM library used?
      2. 3.2 What example firmware is available for the RF430FRL15xH?
        1. 3.2.1 Default Project
        2. 3.2.2 SensorHub Project
        3. 3.2.3 NFC Project
      3. 3.3 Is there an Android app available to interface with the RF430FRL15xH?
      4. 3.4 What is the procedure to change between 4- and 8-byte ISO/IEC 15693 blocks?
      5. 3.5 How can custom ISO/IEC 15693 commands be sent and received?
      6. 3.6 How can a simple SD14 ADC conversion be set up and executed, and the result read back?
      7. 3.7 Where is the software for the TIDM-RF430-TEMPSENSE EVM?
    5. 4 Miscellaneous Questions
      1. 4.1 How can the SD14 ADC result be converted to temperature?
      2. 4.2 Is there a way to program RF430FRL15xH over-the-air?
      3. 4.3 How can the battery-less NFC/RFID temperature sensing patch be used?
      4. 4.4 Is the RF430FRL15xH available as a bare die?
    6. 5 References
  2.   Revision History

2.4 How much power can be sourced from the RF430FRL15xH?

Three sources are available for RF energy harvesting: VDDSW/VDDR, VDDH, and VDD2X.

Table 4 lists test values that were measured using the TRF7970AEVM with a 5-V power supply.

The current that can be harvested from the RF430FRL15xH depends on the distance from the reader to the antenna.

Table 4. Energy Sources

Source Pin Voltage (V) Current (µA)
VDDSW/VDDR 3 1.5 450(2)
VDDH(3) 23 1.86 600(2)
VDD2X 7 2.9 150(1)
VDD2X 7 2.7 90(2)
(1) This value is with the RF430FRL152H in low-power mode. Because the MCU uses the VDD2X rail during active mode, less energy is available externally. If too much energy is harvested, the device will brownout.
(2) Device is operational and can respond to RF commands.
(3) VDDH is available only when there is an active RF field and not when operating from a battery.

The voltage doubler is automatically turned on during FRAM access. The doubler can be set to always on by setting RFPMMCTL0 -> EN_V_DOUB.