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PN7150 Power consumption

Question asked by Daniel Tomicek on Jul 19, 2018
Latest reply on Jul 30, 2018 by Kan_Li



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).