Overview
The PCF7991AT/1081/M112, produced by NXP USA Inc., is a fully integrated Advanced Basestation IC (ABIC) designed primarily for car immobilizer systems. This IC provides read and write access to identification transponders, particularly those in the Philips transponder family (PCF79xx) and other transponders operating at 125 kHz using Amplitude Shift Keying (ASK) for write operations and Amplitude/Phase Modulation (AM/PM) for read operations. The device is notable for its high degree of integration, low external component count, and advanced features such as adaptive sampling time demodulation, which enhances system operation range and reliability.
Key Specifications
| Parameter | Value |
|---|---|
| Package Type | SO14 plastic small outline package; 14 leads (SOT108-1) |
| Temperature Range | -40°C to +85°C |
| Operating Voltage | 4.5V ~ 5.5V |
| Frequency Range | 4MHz ~ 16MHz |
| Interface | Three-wire digital interface (SCLK, DIN, DOUT) |
| Power Modes | Active, Idle, Power-down |
Key Features
- Robust antenna coil power driver stage with modulator
- Low-noise adaptive sampling time demodulator
- Programmable filters, amplifier, and digitizer
- Three-wire microcontroller interface for bidirectional communication
- Support for ASK and AM/PM modulation
- Power-on reset and power-down modes for power saving
- Integrated oscillator and phase measurement capabilities
Applications
The PCF7991AT/1081/M112 is primarily used in car immobilizer systems, providing secure read and write access to identification transponders. It is also suitable for other applications requiring advanced basestation functionality, such as access control systems, RFID systems, and other wireless identification technologies.
Q & A
- What is the primary application of the PCF7991AT/1081/M112?
The primary application is in car immobilizer systems. - What type of modulation does the PCF7991AT support?
It supports Amplitude Shift Keying (ASK) for write operations and Amplitude/Phase Modulation (AM/PM) for read operations. - What is the operating voltage range of the PCF7991AT/1081/M112?
The operating voltage range is 4.5V to 5.5V. - What is the temperature range of the PCF7991AT/1081/M112?
The temperature range is -40°C to +85°C. - What type of interface does the PCF7991AT use for communication?
The device uses a three-wire digital interface (SCLK, DIN, DOUT). - Does the PCF7991AT support power-saving modes?
Yes, it supports Active, Idle, and Power-down modes. - What is the significance of the adaptive sampling time demodulation in the PCF7991AT?
This feature extends the system operation range and eliminates the effect of zero amplitude modulation response from the transponder due to resonance frequency tolerances. - What package type is the PCF7991AT/1081/M112 available in?
The device is available in a SO14 plastic small outline package; 14 leads (SOT108-1). - Can the PCF7991AT be used with other transponder types?
Yes, it can be used with other transponder types operating at 125 kHz. - How does the PCF7991AT integrate with a microcontroller?
The integration is done via a three-wire digital interface for programming and bidirectional communication.
