Features * * * * * * * * * * * * * * RF Frequency Range of 250 - 450 MHz 6 dBm RF Output into Matched Antenna RF Output Power Adjustable in 1 dB Steps Phase-Locked Loop (PLL) Based Frequency Synthesizer Data Bandwidth of up to 20 Kb/s Operates Down to 2V from a CR2032/CR2016 LiMnO2 Battery 8-bit AVR(R) RISC Microcontroller Core Compatible with ATmega163 Minimal External Components Space-saving 20-lead TSSOP 2 KB (1K x 16b) of Flash Program Memory 128 Bytes of EEPROM In-System Programmable Data and Program Memory 6 I/O (Serial I/F, LED Drive Outputs, Button Input Interrupts) Low Battery Detect and Brownout Protection SmartRFTM Wireless Data Transmitter Applications * * * * * * * Remote Keyless Entry (RKE) Transmitters Wireless Security Systems Home appliance control (Gas Fireplace, Ceiling Fans) Radio Remote Control (Hobby, Toys) Garage Door Openers Wireless PC Peripherals (Keyboard, Mouse) Telemetry (Tire Pressure, Utility Meter, Asset Tracking) AT86RF401 Preliminary Description The Atmel AT86RF401 SmartRFTM MicroTransmitterTM is a highly-integrated, low-cost RF transmitter, combined with an AVR(R) RISC microcontroller. It requires only an inexpensive crystal, a single LiMnO 2 coin cell (CR2032 or similar), an inductor, and a tuned loop antenna to implement a complete On-Off Keyed (OOK) wireless RF data transmitter. L2 L1 LOOP FIL Block Diagram ANT XTAL OSCILLATOR XTALB PHASE DETECTOR LOOP FILTER ANTB PRESCALER / 24 CFIL GAIN TRIM DATA AVDD CLOCK POWER RESET SUPPLY WATCHDOG AVR RISC Microcontroller 2 KB Flash Program Memory 128 Bytes EEPROM Data Memory LOW-VOLTAGE DETECT SDI/IO0 RESETB SDO/IO1 IO3 SCK/IO2 IO4 IO5 DVDD BROWN-OUT PROTECT DGND SUPERVISOR AGND B+ RF AMP VCO Rev. 1424A-10/00 1 In-system, programmable, nonvolatile Flash program memory and EEPROM data storage makes possible rapid time to market and lower inventory costs. The AT86RF401 is fabricated in Atmel's 0.6 m mixed signal CMOS + EEPROM process enabling true system-level integration (SLI). Static current consumption is kept to a minimum with an ultra low current shutdown mode. Normal operation resumes when a button is pressed. This activates the crystal oscillator circuit which serves as the clock for the AVR(R) microcontroller. The RF carrier is synthesized utilizing an on-board voltage controlled oscillator (VCO). Its accuracy is maintained with a phase-locked loop detector which compares the crystal oscillator to a frequency-scaled version (divided by 24) of the RF carrier. The resulting error signal adjusts the VCO to produce a very stable RF carrier. An interrupt-based bit-timer structure, integral to the AVR(R) microcontroller, simplifies the implementation of user specific, data bit encoding routines, suc h as PWM or Manchester, for modulating the RF carrier. The RF signal output is placed differentially on a tuned loop antenna, which may be realized as a counterspread copper trace on a PCB. A masked ROM version of this part is planned for highvolume OEM applications. 2 AT86RF401 Pin Configuration 20-lead TSSOP ANTB LOOPFIL L1 L2 RESETB NC SDI/IO0 SDO/IO1 SCK/IO2 XTAL 1 2 3 4 5 6 7 8 9 10 20 19 18 17 16 15 14 13 12 11 ANT CFIL AVDD DVDD AGND DGND IO5 IO4 IO3 XTALB/CLK Atmel Headquarters Atmel Operations Corporate Headquarters Atmel Colorado Springs 2325 Orchard Parkway San Jose, CA 95131 TEL (408) 441-0311 FAX (408) 487-2600 Europe 1150 E. Cheyenne Mtn. Blvd. Colorado Springs, CO 80906 TEL (719) 576-3300 FAX (719) 540-1759 Atmel Rousset Atmel SarL Route des Arsenaux 41 Casa Postale 80 CH-1705 Fribourg Switzerland TEL (41) 26-426-5555 FAX (41) 26-426-5500 Asia Atmel Asia, Ltd. Room 1219 Chinachem Golden Plaza 77 Mody Road Tsimhatsui East Kowloon Hong Kong TEL (852) 2721-9778 FAX (852) 2722-1369 Japan Zone Industrielle 13106 Rousset Cedex France TEL (33) 4-4253-6000 FAX (33) 4-4253-6001 Atmel Smart Card ICs Scottish Enterprise Technology Park East Kilbride, Scotland G75 0QR TEL (44) 1355-803-000 FAX (44) 1355-242-743 Atmel Grenoble Avenue de Rochepleine BP 123 38521 Saint-Egreve Cedex France TEL (33) 4-7658-3000 FAX (33) 4-7658-3480 Atmel Japan K.K. 9F, Tonetsu Shinkawa Bldg. 1-24-8 Shinkawa Chuo-ku, Tokyo 104-0033 Japan TEL (81) 3-3523-3551 FAX (81) 3-3523-7581 Fax-on-Demand North America: 1-(800) 292-8635 International: 1-(408) 441-0732 e-mail literature@atmel.com Web Site http://www.atmel.com BBS 1-(408) 436-4309 (c) Atmel Corporation 2000. Atmel Corporation makes no warranty for the use of its products, other than those expressly contained in the Company's standard warranty which is detailed in Atmel's Terms and Conditions located on the Company's web site. The Company assumes no responsibility for any errors which may appear in this document, reserves the right to change devices or specifications detailed herein at any time without notice, and does not make any commitment to update the information contained herein. No licenses to patents or other intellectual property of Atmel are granted by the Company in connection with the sale of Atmel products, expressly or by implication. Atmel's products are not authorized for use as critical components in life suppor t devices or systems. Marks bearing (R) and/or TM are registered trademarks and trademarks of Atmel Corporation. Printed on recycled paper. Terms and product names in this document may be trademarks of others. 1424A-10/00/xM