3D Analog Front End IC

Texas Instruments/TIRISD Analog Front End (3D AFE) IC is a low-frequency RF chip that simplifies vehicle access design while providing cost, time, power and board space savings. The chip supports passive entry (including anti-collision), passive go, immobilization and remote keyless entry.

The chip is a primary component of a keyless access solution and requires no action from the user to gain entry to their vehicle. In the case of passive entry, drivers can have the keyfob in their pocket or purse, and when they come within 2 meters (about 6.5 feet) of the vehicle and pull the door handle, the device automatically identifies the driver and unlocks the door.

The chip interfaces to three different antennas, ensuring that data signals are picked up regardless of the orientation of the identification device.

Dual wake pattern detection distinguishes whether the vehicle access system has been activated from inside or outside the vehicle.

With a standby current of 5uA and less than 10mV peak-to-peak sensitivity, the system provides a long battery life. The device also features a battery recharge capability and battery-less backup. The unit comes in an industry- standard, 16-pin TSSOP package, small enough to fit into a keyfob or credit-card device. It has been designed with on-chip antenna trimming using EEPROM controlled capacitor arrays to enable easier and more cost- effective production of the keyfob's PCB.

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