Atmel has launched a new family of low-power, high-performance RF receivers designed specifically for the automotive and smart RF markets.
“With the industry’s lowest power consumption, high sensitivity and excellent out-of-band blocking performance, the three new devices (ATA5781, ATA5782 and ATA5783) are ideal for automotive applications including remote keyless entry (RKE), passive entry go (PEG) / passive entry, passive start (PEPS), remote start (RS) and tire pressure monitoring (TPMS) systems,” an Atmel engineering rep told Bits & Pieces.
“This new RF family is also a perfect fit for a broad range of smart RF applications including remote control systems such as garage door openers or telemetering applications. Indeed, the ATA5781, ATA5782 and ATA5783 family consumes only 9.8mA in receive mode, whereas the power consumption of competing devices is typically 12mA.”
Simply put, the reduced drain leaves more charge in the battery, leading to longer standby times when the car is stopped with the receiver enabled. The parts feature an excellent sensitivity of -122.5dBm (typical) when programming the IFBW (intermediate frequency bandwidth) to its lowest value of 25kHz. This RF blocking performance rates the receiver’s immunity to disturbers which are frequently present in the field.
“The outstanding blocking performance of the ATA578x family significantly reduces power-robbing false wake-ups. It also prevents RF range reduction and communication failure caused by RF disturbers,” the engineering rep continued. “Plus, the new devices provide dual paths for simultaneous FSK and ASK reception, as well as superior flexibility by combining RF functionality, an advanced state machine and an Atmel AVR microcontroller core.”
In addition, customers can configure up to five services including RKE, RS, PEPS and TPMS on the fly in idle mode via SPI (serial peripheral interface). This makes end-of-line programming at the customer production site unnecessary, helping to save production time and cost. Meanwhile, dual path reception and flexibility allow customers to adapt receiver behavior for individual applications.
Customers can also optimize power consumption with an adaptable polling scheme. If customer-specific adaptations are required, designers can simply add the existing firmware via Flash (ATA5782) or user ROM (ATA5783).
As noted above, the new RF receiver family includes:
- ATA5781: Ready-to-use RF receiver IC with integrated firmware.
- ATA5782: Firmware is included in read-only memory (ROM). Additional Flash option for application-specific software requirements.
- ATA5783: Cost-optimized version of ATA5782, where customer software is ROM masked.
It should be noted that Atmel’s RF portfolio includes receiver and transceiver devices (ATA5831/32/33) which are pin-function- and RF-matching-compatible to ensure maximum development re-use for one- and two-way systems – thereby helping to accelerate development. Last, but certainly not least, end-application engineers can use the same printed circuit board design for uni-directional and bi-directional car access systems.