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Atmel's MCU-transmitter suits TPMS gauge systems

Posted: 23 Oct 2006 ?? ?Print Version ?Bookmark and Share

Keywords:Atmel? ATA6285? ATA6286? MCU-transmitter? TPMS?

MCU-transmitter ICs from Atmel

Atmel Corp. has released two highly-integrated, low-power MCU-transmitter ICs with sensor interface for tire pressure monitoring sensor (TPMS) gauge systems. The new ATA6285 and ATA6286 devices feature all necessary building blocks to support the measurement and calibration of simple capacitive pressure and motion sensors plus the complete RF transmission functionality. These are the first such devices on the market, Atmel said.

These ICs enable the development of cost-effective applications by allowing the system designer to freely choose simple, low-cost, non-calibrated sensors, the company explained. These capacitive sensors can be calibrated easily by the customer's firmware within the integrated AVR MCU. As a result, the external sensors can be less sophisticated and smaller. This also makes the ICs suitable for sensor manufacturers who wish to develop their own integrated sensor modules.

The single-package devices combine Atmel's ATA5756 and ATA5757 RF transmitters with its low-power, ATmega AVR 8bit Flash MCU family. The ICs are designed to control and transmit data gained from capacitive pressure and motion sensors. Their high functionality, such as integrated temperature sensor with shut-down mode, 90kHz slow-oscillation mode for timer wake-up in sleep mode, and LF input with several header options, makes them suitable for pressure sensor systems, according to Atmel.

These devices are designed to ensure extremely low current consumptiondown to 0.5mA in sleep mode. The maximum sleep-mode current consumption is 0.85?A at 85C in 90kHz slow-oscillation mode, whereas the current consumption during sensor measurement is as low as 200?A which is about 10 times less than piezo-resistive sensor solutions. In transmission mode, the typical current consumption is 8.5mA at 6dBm. The programmable, integrated 125kHz wake-up receiver channel consumes less then 1.7?A in active listening mode.

The ATA6285 operates at 315MHz whereas the ATA6286 is used for 433MHz operation. Both devices are suited for ASK and FSK transmission with a data rate of typically 10kBaud in Manchester mode. The parts can be operated at 2V to 3.6V from a single Li-cell power supply at an operation temperature of -40C to 125C and a storage temperature of -40C to 150C.

Pricing for the ATA6285 and ATA6286 starts at $2.60 each in quantities of 50,000 units.

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