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ST25R3911B-DISCO

Hardware configuration

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Hardware configuration

The ST25R3911B-DISCO board can be connected via USB with a PC, and used as a

general purpose HF reader / NFC initiator. The additional UART and I²C Host interfaces

(see Figure 2) can be used to integrate the board directly into an existing setup.

enables easy communication with the board and allows the user to explore the

ST25R3911B features.

The board is configured to support ISO14443A/B, ISO15693, FeliCa™ and AP2P

communication.

By default a VHBR compatible matching is populated, this matching makes it possible to

achieve bit rates up to 3.4 Mbps. To maximize performance in applications where such very

high bit rates are not needed an alternative NFC Forum matching is available.

To switch to the NFC Forum matching the user only needs to exchange the components

listed in Table 1. This matching doubles the Q-factor, thus increasing the read range up to

10% when operating at bit rates up to 848 kbps (HBR). Operation at bit rates of 1.6 Mbps or

higher is not possible with the NFC Forum matching.

Figure 2. Position of main blocks on ST25R3911B-DISCO board

Table 1. Matching variants

Component

VHBR matching

NFC Forum matching

C404

Keep populated

Use C404_NFCF

C410

Use C410_NFCF

R401

Use R401_NFCF

R402

Use R402_NFCF