Personal Electronics

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Application Notes

Management of the TRF7960 and TRF7960A Startup Sequence

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System developers concerned about minimizing the current draw of TRF7960, -60A (and their variants) systems at startup time need guidance about handling the Regulator Control register (0x0B) value. Guidance is necessary due to the conditions under which the TRF796x/-6xA starts up with the automatic (default) setting of this register, after the EN line (pin 28) is asserted from the controlling MCU in the system. Valid application use case for utilizing this guidance would be battery-powered RFID application where controlling the entire system current draw over time is of the utmost concern. The scope of this application report is limited to providing direction to the embedded developer for the specific handling of the condition at startup.