Introduction

The ATA5835 is a state-of-the-art, ultra-low power, Ultra High Frequency (UHF) smart transceiver based on an 8-bit AVR^® microcontroller.

The ATA5835 is a System on Chip (SoC) consisting of an RF front end, a complex digital baseband and a low-power 8-bit AVR microcontroller, leading to a minimal Bill of Material (BOM) in customer applications. It offers high sensitivity, blocking, image rejection and uses a DC-DC buck converter for the lowest power consumption. The embedded DC-DC regulator makes the system highly efficient with only two external components.

Highly configurable baseband processing offers flexibility for customers, such as multiple scanning functions, pattern-based wake-up and automatic self-polling scenarios. For example, during polling, the IC can scan for specific message contents (IDs) and save valid telegram data in the FIFO buffer for later retrieval. The device integrates two receive paths that enable a simultaneous search for two telegrams with different modulations, data rates, wake-up conditions and so on. The ATA5835 offers additional flexibility as it enables up to eight different services with three channels each, which the user can configure independently and with up to 16-channel polling schemes. The user can place a maximum of four service configurations in the EEPROM; the remaining are available in the SRAM, which allows on-the-fly modifications during the IDLEMode via SPI commands or application software.

The lowest power consumption can be achieved thanks to a built in DC-DC buck converter. The embedded regulator makes the system highly efficient with only two external components.

The ATA5835 includes an integrated antenna switch matrix with three antenna ports allowing triplexer operation (multiband operation for high-end applications) or antenna diversity operations, and, thus, further reduces the external BOM cost.

The user can dynamically configure the RF switch to connect any antenna port to either the receiver or transmitter while providing excellent RX/TX isolation.

The transmit path of the ATA5835 is based on a closed-loop fractional-N modulator with Gaussian shaping and pre-emphasis functionality that enables high data rates and mitigates EMC emissions.

The internal microcontroller is built with a 2-Kbyte SRAM and 20-Kbyte user Flash memory to support customer application software, LIN/UART, as well as a debugWIRE and ISP interfaces for programming purposes.

Related Devices:

The ATA5787 is available as a pure receiver with features identical to the ATA5835 but without transmit function.