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PN7150 Power consumption

Question asked by Daniel Tomicek on Jul 19, 2018
Latest reply on Aug 22, 2018 by Daniel Tomicek



Our PN7150 design is setup for "configuration 1" where VBAT is connected to a 4.5V rail power supply and our TVDD configuration is: {0x20, 0x02, 0x07, 0x01, 0xA0, 0x0E, 0x03, 0x02, 0x1B, 0x00};


When measuring the current on the 4.5V rails during a read of a card (Mifare Classic & Desfire EV2 tested) we are seeing peak current of ~240mA.


From my understanding, there is a current limit on the VDD(TX) rail of 180mA according to the data sheet.


Is this current of ~240mA expected? (there is no other peripheral on the rail). 

Where is the current measured on the VDD(TX) rail for its limit?




Attached is a screenshot of the current during polling, and with markers around the read (on the 4.5V rail).