The AS3931-ZTSU from ams-OSRAM USA INC. is an RFID reader Integrated Circuit for 19 to 150 kHz with an SPI interface, a 2.4 to 5.5 V supply, and a 16-TSSOP (0.173", 4.40 mm width) package.
The AS3931-ZTSM from ams-OSRAM USA INC. is an RFID reader Integrated Circuit for 19 to 150 kHz with an SPI interface, a 2.4 to 5.5 V supply, and a 16-TSSOP (0.173", 4.40 mm width) package.