DALLAS -- Texas Instruments Inc. today announced a new low-frequency RF chip designed to simplify the design of vehicle access systems while cutting cost, development time and broad space requirements. TI's new 3D analog frontend IC, designated TMS37122, supports passive entry, including anti-collision, "passive go," immobilization, and remote keyless entry features all in one system, said the company.
"Up until now, engineers needed discrete solutions that were costly and consumed a lot of power," said Michael Knebelkamp, automotive strategy manager for radio-frequency identification (RFID) systems at TI.
TI said its new analog frontend 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 device has a standby current of 5 microamps and less than 10 mV peak-to-peak sensitivity, which provides longer battery life. The device also features a battery recharge capability and battery-less backup. It comes in a 16-pin TSSOP package, which is small enough to fit into a keyfob or credit-card device.
The TMS37122 is compatible with TI's digital signature transponder (DTS), which provides high security, anti-theft projection using 40-bit challenge/response encryption and RFID to interrogate the driver before a vehicle is started, said the Dallas company. The device also uses on-chip antenna trimming, based on EEPROM-controlled capacitor arrays, which eases production of keyfob products, said TI.
samples of the analog front end device are available now and volume production is slated to start in the first quarter of 2001.