ATA5781ATA5782ATA5783UHFASKFSKReceiverUSERMANUAL.pdf_ATA663211

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ATMEL CONFIDENTIAL

FOR RELEASE ONLY UNDER

NON-DISCLOSURE AGREEMENT

9314GX-RKE-07/15

Features

● AVR

microcontroller core with 1Kbyte SRAM and 24Kbyte RF library in firmware

(ROM)

● Atmel

ATA5782: 20Kbyte of user Flash

● Atmel ATA5783: 20Kbyte of user ROM

● Atmel ATA5781: No user memory — RF library in firmware only

● Supported frequency ranges

● Low-Band 310MHz to 318MHz, 418MHz to 477MHz

● High-Band 836MHz to 956MHz

● 315.00MHz/433.92MHz/868.30MHz and 915.00MHz with one 24.305MHz crystal

● Low current consumption

● 9.8mA for RXMode (Low-Band), 1.2mA for 21ms cycle three-channel polling

● Typical OFFMode current of 5nA (maximum 600nA at Vs = 3.6V and T = 85°C)

● Supports the 0dBm class of ARIB STD-T96

● Input 1dB compression point

● –48dBm (full sensitivity level)

● –20dBm (active antenna damping)

● Programmable channel frequency with fractional-N PLL

● 93Hz resolution for Low-Band

● 185Hz resolution for High-Band

● FSK deviation ±0.375kHz to ±93kHz

● FSK sensitivity (Manchester coded) at 433.92MHz

● –108.5dBm at 20Kbit/s f = ± 20kHz BWIF = 165kHz

● –111dBm at 10Kbit/s f = ± 10kHz BWIF = 165kHz

● –114dBm at 5Kbit/s f = ± 5kHz BWIF = 165kHz

● –122.5dBm at 0.75Kbit/s f = ± 0.75kHz BWIF = 25kHz

● ASK sensitivity (Manchester coded) at 433.92MHz

● –110.5dBm at 20Kbit/s BWIF = 80kHz

● –125dBm at 0.5Kbit/s BWIF = 25kHz

● Programmable Rx-IF bandwidth 25kHz to 366kHz (approximately 10% steps)

● Blocking (BWIF = 165kHz): 64dBc at frequency offset = 1MHz and 48dBc at 225kHz

● High image rejection: 55dB at 315MHz/433.92MHz and 47dB at 868.3MHz/915MHz

without calibration

ATA5781/ATA5781N/ATA5782/ATA5783

UHF ASK/FSK Receiver

USER MANUAL

Atmel Confidential: For Release Only Under Non-Disclosure Agreement (NDA)

ATA5781/ATA5781N/ATA5782/ATA5783 [User Manual]

9314GX–RKE–07/15

●

Supported data rate in buffered mode 0.5Kbit/s to 80Kbit/s (120Kbit/s NRZ)

● Supports pattern-based wake-up and start of frame identification

● Flexible service configuration concept with on-the-fly (OTF) modification (in IDLEMode) of SRAM service parameters

(data rate, …)

● Each service consists of

● One service-specific configuration part

● Three channel-specific configuration parts

● Three service configurations are located in EEPROM

● Two service configurations are located in SRAM and can be modified via SPI or embedded application

software

● Digital RSSI with very high relative accuracy of ±1dB thanks to digitized IF processing

● Programmable clock output derived from crystal frequency

● 1024byte EEPROM data memory for receiver configuration

● SPI interface for Rx data access and receiver configuration

● 500Kbit SPI data rate for short periods on SPI bus and host controller

● On demand services (SPI or API) without polling or telegram reception

● Integrated temperature sensor

● Self check and calibration with temperature measurement

● Configurable EVENT signal indicates the status of the IC to an external microcontroller

● Automatic low-power channel polling

● Flexible polling configuration concerning timing, order and participating channels

● Fast reaction time

● Power-up (typical 1.5ms, OFFMode -> RXMode)

● Supports mixed ASK/FSK telegrams

● Non-byte aligned data reception

● Software customization

● Antenna diversity with external switch via GPIO control

● Antenna diversity with internal SPDT switch

● Supply voltage ranges 1.9V to 3.6V and 2.4V to 5.5V

● Temperature range –40°C to +105°C

● ESD protection at all pins (±4kV HBM, ±200V MM, ±750V FCDM)

● Small 55mm QFN32 package/pitch 0.5mm

● Backward package and pin-to-pin compatibility with Atmel

ATA5780N

● Backward RF matching compatibility with Atmel ATA5780N (RF redesign not needed)

● Suitable for applications governed by EN 300 220 and FCC part 15, title 47

Atmel Confidential: For Release Only Under Non-Disclosure Agreement (NDA)

ATA5781/ATA5781N/ATA5782/ATA5783 [User Manual]

9314GX–RKE–07/15

1. General Product Description

1.1 Introduction

The Atmel

ATA5781/2/3 is a highly integrated, low-power UHF ASK/FSK RF receiver with an integrated AVR

microcontroller. It is package and pin-to-pin compatible with the previous generation of RF devices (Atmel ATA5830N,

ATA5831/2/3 and Atmel ATA5780N).

The Atmel ATA5781/2/3 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 ISM frequency bands in the ranges of 310MHz to 318MHz, 418MHz to

477MHz and 836MHz to 956MHz. 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 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 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, etc.

The Atmel ATA5781/2/3 implements a flexible service configuration concept and supports up to 15 channels. The channels

are grouped into five service configurations with three channels each. Three service configurations are located in the

EEPROM. Two service configurations are located in the SRAM to allow on-the-fly modifications during IDLEMode via SPI

commands or application software. The application software is located in the Flash for Atmel ATA5782 or in the ROM for

Atmel ATA5783. Highly configurable and autonomous scanning capability enables flexible polling scenarios with up to 15

channels. The configuration of the receiver is stored in a 1024byte EEPROM. The SPI interface enables external control and

device reconfiguration.

In the Atmel ATA5782 the internal microcontroller with 20Kbyte user Flash can be used to add custom extensions to the

Atmel firmware. The Atmel ATA5783 provides 20Kbyte user ROM as a replacement for the 20Kbyte Flash for high-volume

applications. The Atmel ATA5781 embeds only the firmware ROM without user memory.

The debugWIRE and ISP interface are available for programming purposes.

Compatibility to the Atmel ATA5780N, Atmel ATA5830N and Atmel ATA5831/2/3

The Atmel ATA5781/2/3 is pin-to-pin compatible with the Atmel ATA5830N transceiver, the Atmel ATA5780N receiver and

the Atmel ATA5831/2/3 transceivers. The Rx performance of the receivers matches that of the transceivers.

Table 1-1. Program Memory Comparison of Atmel ATA5781/2/3 Devices

Device Atmel Firmware ROM User Flash User ROM

Atmel ATA5782 24Kbyte 20Kbyte -

Atmel ATA5783 24Kbyte - 20Kbyte

Atmel ATA5781 24Kbyte - -

Atmel Confidential: For Release Only Under Non-Disclosure Agreement (NDA)

ATA5781/ATA5781N/ATA5782/ATA5783 [User Manual]

9314GX–RKE–07/15

1.2 Document Guide

Chapter 1 “General Product Description”

Chapter 1 provides an initial overview of the functionality, features, and application areas of the Atmel

ATA5781/2/3. Pin

descriptions are included in this chapter.

Chapter 2 “System Functional Description”

Chapter 2 provides a functional description of the entire system. All features, operating modes, and EEPROM configuration

options are described. This chapter will interest

● Standard users who want to gain a functional understanding of the IC

● Users who want set up an EEPROM configuration for a specific application

● Users who want to use the built-in firmware library by controlling the IC via the SPI interface

Chapter 3 “Hardware”

Chapter 3 provides a detailed description of the Atmel ATA5781/2/3 hardware. Every hardware block is described including

all registers. This chapter will interest

● Advanced users who want to gain a deep understanding of the IC

● Users who want to write proprietary software for Flash or user ROM applications and therefore need to access

the hardware registers directly

Chapter 4 “Application”

Chapter 4 covers the application board design and general information on Rx-Tx system design. The chapter includes

examples and will interest

● Application engineers

● System engineers who design the overall Rx-Tx link of the transmission system

Chapter 5 “Electrical Characteristics”

Chapter 5 lists all parameters of the Atmel ATA5781/2/3 including absolute maximum ratings, supply voltages, current

consumption, and RF characteristics.

Chapter 6 “Timing Characteristics”

Chapter 6 contains sample timing values for start-up of operating modes and switch between operating modes.

Chapter 7 “Appendix”

The Appendix contains a list of abbreviations, the AVR

instruction set, SPI commands, and tables with various memory

maps. The chapter is intended to be a quick reference guide for instructions, commands, variables, and registers.

Chapter 8 “Ordering Information”

Chapter 8 provides the order numbers for the Atmel ATA5782, Atmel ATA5783, and Atmel ATA5781.

Chapter 9 “Package Information”

Chapter 9 shows the precise dimensions of the Atmel ATA5781/2/3 package. This information is useful for the application

board design.

Chapter 10 “Revision History”

Chapter 10 contains the version history and change notes of all releases of this document.

Chapter 11 “Table of Contents”

Chapter 11 shows an outline of this document down to the third heading level. A complete bookmark list with all heading

levels is included in the PDF version of this document.

Atmel Confidential: For Release Only Under Non-Disclosure Agreement (NDA)

ATA5781/ATA5781N/ATA5782/ATA5783 [User Manual]

9314GX–RKE–07/15

1.3 System Overview

Figure 1-1. Circuit Overview

Figure 1-1 shows an overview of the main functional blocks of the Atmel

ATA5781/2/3. External control of the

Atmel ATA5781/2/3 is performed through the SPI pins SCK, MOSI, MISO, and NSS on port B. The configuration of the

Atmel ATA5781/2/3 is stored in the EEPROM and a large portion of the functionality is defined by the firmware located in the

ROM and processed by the AVR

. An SPI command can trigger the AVR to configure the hardware according to settings

that are stored in the EEPROM and start up a given system mode (e.g., RXMode, or PollingMode). Internal events such as

“Start of Telegram” or “FIFO empty” are signaled to an external microcontroller on pin 28 (PB6/EVENT).

During the start-up of a service, the relevant part of the EEPROM content is copied to the SRAM. This allows faster access

by the AVR during the subsequent processing steps and eliminates the need to write to the EEPROM during runtime

because parameters can be modified directly in the SRAM. As a consequence the user does not need to observe the

EEPROM read/write cycle limitations.

It is important to note that all PWRON and NPWRON pins (PC1..5, PB4, PB7) are active in OFFMode. This means that even

if the Atmel ATA5781/2/3 is in OFFMode and the DVCC voltage is switched off, the power management circuitry within the

Atmel ATA5781/2/3 biases these pins with VS.

AVR ports can be used as button inputs, external LNA supply voltage (RX_ACTIVE), LED drivers, EVENT pin, switching

control for additional SPDT switches, general purpose digital inputs, or wake-up inputs, etc. Some functionality of these ports

is already implemented in the firmware and can be activated by adequate EEPROM configurations. Other functionality is

available only through custom software residing in the 20Kbyte Flash program memory (Atmel ATA5782) or in the 20Kbyte

user ROM program memory (Atmel ATA5783).

Rx DSP

Front End

RFIN

DATA BUS

SRC, FRC

Oscillators

Port B (8)XTO

XTAL

PB[7..0]

(SPI)

PC[5..0]

Port C (6)

AVR

Peripherals

AVR CPU

Supply

Reset

SRAM

ROM

Flash

EEPROM

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