Introduction

The ATA5785 is a highly integrated, low-power Ultra High Frequency (UHF) Amplitude Shift Keying (ASK)/Frequency Shift Keying (FSK) Radio Frequency (RF) receiver with an integrated AVR® microcontroller. It is package and pin-to-pin compatible with the previous generation of RF receivers (ATA5780N and ATA5781/2/3).The ATA5785 is partitioned into three sections; an RF front end, a digital baseband and the low-power 8-bit AVR microcontroller. The product is designed for the Industrial Scientific and Medical (ISM) frequency bands in the ranges of 310 MHz to 318 MHz and 418 MHz to 477 MHz. The external part count is kept to a minimum due to the very high level of integration in this device. By combining outstanding RF performance with highly sophisticated baseband signal processing, robust wireless communication can be easily achieved. The receive path uses a low-IF architecture with an integrated double quadrature receiver and digitized Intermediate Frequency (IF) processing. This results in high image rejection and excellent blocking performance. In addition, highly flexible and configurable baseband signal processing allows the receiver to operate in several scanning, wake-up and automatic self-polling scenarios. For example, during polling, the IC can scan for specific message content (IDs) and save valid telegram data in the First In First Out (FIFO) buffer for later retrieval. The device integrates two receive paths that enable a parallel search for two telegrams with different modulations, data rates, wake-up conditions and so on.

The ATA5785 implements a flexible service configuration concept and supports up to six channels. The channels are grouped into two service configurations with three channels each. The service configurations are located in the Static Random Access Memory (SRAM) and allow On-the-Fly (OTF) modifications during the IDLEMode via Serial Programming Interface (SPI) commands. Highly configurable and autonomous scanning capability enables flexible polling scenarios with up to 15 channels. The SPI allows external control and device configuration.