SensorDynamics (Graz, Austria) has launched a high-performance, single-chip quad-band multichannel transceiver system which is claimed to be the first fail-safe, fully integrated ISM band transceiver with a universal sensor interface designed to run on low power generated by energy harvesting.
The SD341 automotive transceiver is controlled by an ultra low-power management circuit that enables operation with only microwatts of power. In a typical application, the power management unit activates the on-board 8051 microcontroller and other functional units that are needed for a certain task as soon as sufficient power is detected. Typical applications include car access systems and wireless, batteryless remote sensors such as tire pressure monitoring systems.
The SD341 supports all four ISM bands (315, 433, 868 and 915 MHz) for worldwide license-free FSK or ASK operation. Data rates up to 125 kbit/s are possible. The 32 KB on-chip flash memory is sufficient for complex software. Several interfaces are implemented: up to twelve mixed signal general purpose I/O pins, a four-wire interface (SPI compatible), and a UART interface. Two 12-bit ADCs with 400 kHz bandwidth are available for acquiring external sensor signals, and an 8-bit DAC is provided for driving external sensors.
To handle diverse sources of energy such as solar cells, electromechanical or thermoelectrical energy generators, the SD341 operates with a minimum supply voltage of only 2 V and is not limited to a specific voltage ramp for power on. It also accepts large voltage variations during operation without loss of performance.
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