(ULP) NFC/RFID Card Presence Detection 1.1kO BAT54WSDICT 100pF (SCHOTTKY) 1MO 20pF 30O CA1 VDD VIN (2.7V-3.6V) SYS_CLK (critical) MCU (any MSP430 with Comparator A+ module) SPI or Parallel VIN TRF79xxA TXOUT RX_IN1 RX_IN2 fc = 13.56MHz Z Matching / Filtering DC SUPPLY (...