Description
The ST25RU3993 is an EPC Class 1 Gen 2 RFID reader IC that implements all the relevant protocols, including ISO 18000-6C, the ISO 29143 air-interface protocol for mobile RFID interrogators, and ISO 18000-6A/B for operation in direct mode. It includes an on-chip VCO and a power amplifier, and offers a complete set of RFID features including Dense Reader Mode (DRM) functionality and support for frequencyhopping, low-level transmission coding, low-level decode, data framing and CRC checking. The ST25RU3993 operates at very low-power, making it suitable for use in portable and batterypowered equipment such as mobile phones.

Features
■ Supply voltage range 3.0 to 3.6 V – Limited operation possible down to 2.7 V – Maximum PA supply voltage 4.3 V – Peripheral I/O supply range 1.65 to 5.5 V
■ Protocol support for: – ISO 18000-6C (EPC Class1 Gen2) – ISO 29143 (Air interface for mobile RFID) – ISO 18000-6A/B through direct mode
■ DRM: 250 kHz and 320 kHz filters for M4 and M8
■ Integrated supply regulators
■ Frequency hopping support
■ ASK or PR-ASK modulation
■ Automatic I/Q selection
■ Phase bit for tag tracking with 8-bit linear RSSI
■ Temperature range: -40 °C to 85 °C
■ 48-pin QFN (7x7x0.9 mm) package