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ST25R3918 Datasheet(PDF) 15 Page - STMicroelectronics |
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ST25R3918 Datasheet(HTML) 15 Page - STMicroelectronics |
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15 / 141 page  DS13490 Rev 2 15/141 ST25R3918 Description 140 2.2 Block diagram The ST25R3918 block diagram is shown in Figure 3, the main functions are described in the following subsections. Figure 3. ST25R3918 block diagram 2.2.1 Transmitter In reader mode the transmitter drives an external antenna through pins RFO1 and RFO2 to generate the RF field. Single sided and differential antenna configurations are supported. The transmitter block also generates the OOK or AM modulation of the transmitted RF signal. The transmitter can either operate RFO1 and RFO2 independently to drive up to two antennas in single ended configuration or operate RFO1 and RFO2 combined to drive one antenna in differential configuration. The drivers are designed to directly drive antenna(s) integrated on the PCB as well as antennas connected with 50 Ω cables. Some of the advanced features are not fully usable if the antenna is connected with a 50 Ω cable. In card emulation mode the transmitter generates the load modulation signal by changing the resistance of the internal antenna driver connected to the antenna via RFO1 and RFO2. The transmitter can also drive an external MOS transistor via the EXT_LM pin to generate the load modulation signal. ST25R3918 Receiver Phase and amplitude detector Transmitter VDD_A, VDD_D reference regulator A/D converter XTAL oscillator POR and Bias External field detector XTO XTI RFO1 RFO2 RFI1 RFI2 RC oscillator Digital part SPI FIFO 512 bytes Control logic SPI/I2C interfaces RX decoding Wake-up timer Level shifters VDD_IO IRQ MCU_CLK Passive target memory TX coding Passive target SDD logic P2RAM 6 bytes Protocol timers Registers 74 bytes VDD_RF, VDD_AM regulator VDD_TX VDD_RF VDD_AM VDD_DR VDD VDD_A VDD_D I2C_EN EXT_LM MS54048V1 |
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