|Category||RF & Microwaves => Transmitters|
|Description||Smart RF Wireless Data Transmitter
Highly integrated, low-cost RF transmitter, combined with an AVR RISC Microcontroller. RF Frequency Range of 250-450 MHz
|Datasheet||Download AT86RF401 datasheet
RF Frequency Range of 264456 MHz 6 dBm RF Output into Matched Antenna RF Output Power Adjustable over 36 dB with 1 dB Resolution Phase-locked Loop (PLL) Based Frequency Synthesizer Supports OOK Modulation Data Bandwidth to 10 Kbps Manchester 2-volt Operation 8-bit AVR RISC Microcontroller Core Minimal External Components Space-saving 20-lead TSSOP 16) of Flash Program Memory 128 Bytes of EEPROM 128 Bytes of SRAM In-system Programmable Data and Program Memory Six I/Os (Serial I/F, LED Drive Outputs, Button Input Interrupts) Low Battery Detect and Brown-out Protection Software Fine-tuning of VCO Tank CircuitApplications
Remote Keyless Entry (RKE) Transmitters Wireless Security Systems Home Applicance Control (Lighting Control, Ceiling Fans) Radio Remote Control (Hobby, Toys) Garage Door Openers Wireless PC Peripherals (Keyboard, Mouse) Telemetry (Tire Pressure, Utility Meter, Asset Tracking)Description
The Atmel AT86RF401 Smart RF Microtransmitter is a highly integrated, low-cost RF transmitter, combined with an AVR RISC microcontroller. It requires only a crystal, a single LiMnO2 coin cell (CR2032 or similar), three capacitors, an inductor and a tunedloop antenna to implement a complete on-off keyed (OOF) wireless RF data transmitter. Figure 1. Block DiagramXTAL/CLK OSCILLATOR XTALB PHASE DETECTOR LOOP FILTER VCO
DATA CLOCK RESET WATCHDOG LOW-VOLTAGE DETECT BROWN-OUT PROTECT
AVR RISC 2 KB Flash Program Memory 128 Bytes EEPROM Data Memory
In-system programmable, nonvolatile Flash program memory and EEPROM data storage make possible rapid time-to-market and lower inventory costs. In-system programmable, nonvolatile Flash program memory and EEPROM data storage make possible rapid time-to-market and lower inventory costs.In-system programmable, nonvolatile Flash program memory and EEPROM data storage make possible rapid time-to-market and lower inventory costs.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 that serves as the clock for the AVR microcontroller. The RF carrier is synthesized utilizing an on-board Voltage Controlled Oscillator (VCO). Optimal tuning of the VCO is maintained over component tolerance through the use of a software-controlled switched capacitor array. Its accuracy is maintained with a PLL detector that compares the crystal oscillator to a frequency-scaled version (divided 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 microcontroller, simplifies the implementation of user-specific, data-bit encoding routines, such as PWM or Manchester, for modulating the RF carrier. Thirty-six of RF power output control is available to the user 1 dB steps and is addressable in software. The RF signal output is placed differentially on a tuned-loop antenna, which may be realized as a counterspread copper trace on a PCB. The AT86RF401 is fabricated in Atmel's 0.6 µm Mixed Signal CMOS + EEPROM process, enabling true system-level integration (SLI). Figure 2. 20-lead TSSOP
ANTB LOOPFIL L1 L2 RESETB N/C I/O0 (SDI) I/O1 (SDO) I/O2 (SCK) XTAL/CLK ANT N/C AVDD DVDD AGND DGND I/O4 I/O3 XTALB
L1 U1 ANTB LOOPFIL L1 L2 RESETB IO1/SDO IO2/SCLK XTAL/CLK ANT NC AVDD DVDD AGND DGND IO4 IO3 XTALB V+
Part Number S3 U1 Switch AT86RF401 Value (Common) 100 pF Antenna Dependent Not req'd Not req'd 82 nH Not req'd Antenna Dependent Not req'd Not req'd 39 nH Not req'd Antenna Dependent Frequency Dependent Frequency Dependent Frequency Dependent Frequency Dependent Value (315 MHz) Value (433.92 MHz) Value (Ext. Loop Filter) Specification CR2032, Li Battery 10% 0603, COG, 5% 0603, COG, pF 0603, COG, 5% 0603, COG, 0.25 pF SPST 20-lead TSSOP 13.125 MHz: CrystekTM P/N 016757 18.080 MHz: Crystek P/N 016758
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