Product overview
Description
The ST25R3918 is a multipurpose NFC transceiver supporting NFC reader, passive peer to peer functionality and NFC card emulation mode.
This IC is optimized for IOT and other consumer or industrial applications where excellent analog performance is required.
The ST25R3918 is also optimized to achieve good read ranges with low output power, even under noisy and harsh environments, using noise reduction receiver technology.
This IC offers an advanced analog front end (AFE) and a highly integrated data framing system for NFC-A/B (ISO 14443A/B) reader, including higher bit rates. NFC-V (ISO 15693) reader is supported up to 53 kbps via streaming mode to read cards.
ISO 18092 passive initiator and target and NFC-A / NFC-F card emulation are also available to ensure communication between end products. This enables device programming or simple NDEF data transfers to interact with Android™ phones, or to use Apple®App Clips.
Special stream and transparent modes of the AFE and framing system can be used to implement other custom protocols in reader or card emulation mode.
The ST25R3918 includes a low power wake-up mode to scan for the presence of a card by performing a measurement of the amplitude or phase of the antenna signal. It also contains a low power RC oscillator and wake-up timer to automatically trigger the device after the configured time period and check for a presence of a tag.
The ST25R3918 is designed to operate from a wide power supply range (2.6 to 5.5 V from -40 °C to +105 °C, 2.4 to 5.5 V from -20 °C to +105 °C), and a wide peripheral IO voltage range (from 1.65 to 5.5 V).
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All features
- Operating modes
- Reader/writer
- Card emulation
- Passive peer to peer
- RF communication
- NFC-A / ISO14443A up to 848 kbit/s
- NFC-B / ISO14443B up to 848 kbit/s
- NFC-V / ISO15693 up to 53 kb/s
- NFC-A / ISO14443A and NFC-F / FeliCa™ card emulation
- Low level modes to implement MIFARE Classic® compliant or other custom protocols
- Key features
- Dynamic power output (DPO) controls the field strength to stay within given limits
- Active wave shaping (AWS) reduces over-and under-shoots
- Noise suppression receiver (NSR) allows reception in noisy environment
- Automatic gain control and squelch feature to maximize SNR
- Low power capacitive and inductive card detection
- Low power NFC passive target modes
- Adjustable ASK modulation depth, from 5 to 40%
- Integrated regulators to boost system PSRR
- AM/PM and I/Q demodulator with baseband channel summation or automatic channel selection
- Possibility to drive two independent single ended antennas
- Measurement of antenna voltage amplitude and phase, RSSI, on-chip supply and regulated voltages
- External communication interfaces
- 512-byte FIFO
- Serial peripheral interface (SPI) up to 10 Mbit/s
- I2C with up to 400 kbit/s in Fast-mode, 1 Mbit/s in Fast-mode Plus, and 3.4 Mbit/s in High-speed mode
- Electrical characteristics
- Wide supply voltage and ambient temperature range (2.6 to 5.5 V from -40 °C to +105 °C, 2.4 to 5.5 V from -20 °C to +105 °C)
- Wide peripheral communication supply range, from 1.65 to 5.5 V
- Quartz oscillator capable of operating with 27.12 MHz crystal with fast start-up
- Operating modes
eDesignSuite
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Signal Conditioning Design Tool
NFC/RFID Calculators
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Estimate
Active Filters
Comparators
Low side Current Sensing
High side Current Sensing
NFC Inductance
UHF Link Budget
NFC Tuning Circuit
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STMicroelectronics - ST25R3918
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Quality and Reliability
| Part Number | Marketing Status | Package | Grade | RoHS Compliance Grade | Material Declaration** |
|---|---|---|---|---|---|
| ST25R3918-AQET | Active | UFQFPN 32 5x5x0.55 mm | Industrial | Ecopack2 | |
| ST25R3918-AQWT | NRND | VFQFPN 5X5X1 32L WETTABLE FLANKS | Industrial | Ecopack2 |
(**) The Material Declaration forms available on st.com may be generic documents based on the most commonly used package within a package family. For this reason, they may not be 100% accurate for a specific device. Please contact our sales support for information on specific devices.
Sample & Buy
| Part Number | Marketing Status | Budgetary Price (US$)*/Qty | Order from ST | Order from distributors | Package | Packing Type | RoHS | Country of Origin | ECCN (US) | ECCN (EU) | Operating temperature (°C) | Operating Temperature (°C) (max) | Free Samples | ESample Max Qty | ||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| min | max | |||||||||||||||
| ST25R3918-AQWT | | | distributors No availability of distributors reported, please contact our sales office |
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| ST25R3918-AQET | | | distributors No availability of distributors reported, please contact our sales office |
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ST25R3918-AQWT NRND
ST25R3918-AQET Active
(*) Suggested Resale Price (USD) per defined quantity for BUDGETARY USE ONLY. For quotes, prices in local currency, please contact your local ST Sales Office or our Distributors