Atmel has released two UHF ASK/FSK transmitter ICs optimised for use in battery-powered tyre pressure monitoring system (TPMS) modules. The ATA5756 is designed for applications in the 315 MHz range, while the ATA5757 is dedicated for 433 MHz, but can also be operated at 448 MHz.
Because they have a very short settling time (typically less than 0,85 ms) and low active current consumption, the new TPMS ICs help to reduce the total current consumption and thus extend the modules' life time. This is mandatory for TPMS applications since the modules that are mounted on the rim of vehicle wheels, continuously transmitting tyre pressure data to the vehicle's body, must guarantee an overall life-time of 10 years.
The ATA5756's and the ATA5757's fast settling time and low power, makes the devices also well suited for PEG (passive entry go) key fobs where quick reaction times on protocols is a main requirement. The typical current consumption during transmission mode (PA ON) is 8,1 mA with a typical output power of 6 dBm. During power-down mode, current consumption is as low as 1 nA. A 3-wire-compatible interface allows connecting additional devices. The devices use state-of-the-art 13 MHz crystals for operation which allow small crystal packages. The PLL transmitter ICs can be used in ASK and FSK systems with 20 kBaud Manchester or 40 kBaud NRZ coding schemes.
Atmel's transmitter ICs provide guaranteed 2 V operation at -40°C, and come in small-outline TSSOP10 packages.
For more information contact Arrow Altech Distribution, 011 923 9600, EBV-Electrolink, 021 421 5350 or Memec SA, 011 897 8600.
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