AT86RF401U-XI

AT86RF401U-XI Datasheet

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.

Part	Datasheet
AT86RF401U-XI	AT86RF401U-XI (pdf)

Related Parts	Information
AT86RF401E-EK1	AT86RF401E-EK1
AT86RF401U-EK1	AT86RF401U-EK1
AT86RF401X-6GS	AT86RF401X-6GS
AT86RF401U-6GS	AT86RF401U-6GS
AT86RF401E-6GS	AT86RF401E-6GS

PDF Datasheet Preview
• RF Frequency Range of 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 of Up to 10 Kbps Manchester • 2-volt Operation • 8-bit RISC Microcontroller Core • Minimal External Components • Space-saving 20-lead TSSOP • 2 KB 1K x 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 Circuit • 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 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 Block Diagram Smart RF Wireless Data Microtransmitter AT86RF401 LOOP FIL L1 L2 XTAL/CLK XTALB OSCILLATOR PHASE DETECTOR LOOP FILTER PRESCALER ÷ 24 B+ ANT RF AMP ANTB AVDD AGND POWER SUPPLY SUPERVISOR CLOCK RESET WATCHDOG LOW-VOLTAGE DETECT BROWN-OUT PROTECT DATA GAIN TRIM RISC µC 2 KB Flash Program Memory 128 Bytes EEPROM Data Memory DVDD DGND IO5 IO4 IO3 SCK/IO2 SDO/IO1 SDI/IO0 RESETB 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 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 microcontroller, simplifies the implementation of user-specific, data-bit encoding routines, such as PWM or Manchester, for modulating the RF carrier. Thirty-six dB of RF power output control is available to the user in 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 µm Mixed Signal CMOS + EEPROM process, enabling true system-level integration SLI . Figure 20-lead TSSOP ANTB 1 LOOPFIL 2 L1 3 L2 4 RESETB 5 N/C 6 I/O0 SDI 7 I/O1 SDO 8 I/O2 SCK 9 XTAL/CLK 10 20 ANT 19 N/C 18 AVDD 17 DVDD 16 AGND 15 DGND 14 I/O5 13 I/O4 12 I/O3 11 XTALB 2 AT86RF401 AT86RF401 Figure Sample Circuit EXTERNAL LOOP FILTER OPTIONAL R1 V+ C2 S1 RESET SDI SDO SCLK SPI Programming Interface 1 2 3 4 5 6 7 8 9 10 ANTB LOOPFIL L1 L2 RESETB NC IO0/SDI IO1/SDO IO2/SCLK XTAL/CLK Ordering Information RF Output 315 MHz 434 MHz 264 to 456 MHz Ordering Code AT86RF401U AT86RF401E AT86RF401X Package 20T Application North American European All Applications AT86RF401 Temperature Operating Range −40°C to 85°C −40°C to 85°C −40°C to 85°C Package Drawing 20A2 TSSO All devices are packaged on tape in reel standard reel quantity is 2,500 pieces. L1 E E1 End View Top View COMMON DIMENSIONS Unit of Measure = mm SYMBOL MIN NOM MAX NOTE Side View This drawing is for general information only. Please refer to JEDEC Drawing MO-153, Variation AC, for additional information. Dimension D does not include mold Flash, protrusions or gate burrs. Mold Flash, protrusions and gate burrs shall not exceed mm in per side. Dimension E1 does not include inter-lead Flash or protrusions. Inter-lead Flash and protrusions shall not exceed mm in per side. Dimension b does not include Dambar protrusion. Allowable Dambar protrusion shall be mm total in excess of the b dimension at maximum material condition. Dambar cannot be located on the lower radius of the foot. Minimum space between protrusion and adjacent lead is mm. Dimension D and E1 to be determined at Datum Plane H. 6/3/02 2325 Orchard Parkway R San Jose, CA 95131 TITLE 20A2, 20-lead x mm Body , pitch, Thin Shrink Small Outline Package TSSOP 20A2 50 AT86RF401 AT86RF401 Data Sheet Change Log Please note that the page numbers referenced below apply to this document. Changes from • Updated text in Low Battery Detection section on page Configuration Register section and became Table 21 page • Updated text in Battery Low Configuration Register section page • Renumbered tables as required to maintain proper sequence. • Added Data Sheet Change Log section page • Replaced “Power Control Register” with “AVR Configuration Register” in Button Detect Register section page • Removed references to CFIL in Figures 1, 2, and 3 and Table • Changed description of Bit[2] LOC in Transmit Control Register section page 30 from R/W to R and included additional descriptive text for Bit[5], Bit[4], and Bit[2]. • Added “Read Signature Byte” command to Serial Programming Instruction Set shown in Table 7 on page 15 and added Signature Bytes section on page • Added note regarding maximum output power in Power Attenuation Control Register description section page • Added text to “Button Reset” paragraph in the Reset Sources section page

PDF Datasheet Preview

• RF Frequency Range of 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 of Up to 10 Kbps Manchester
• 2-volt Operation
• 8-bit RISC Microcontroller Core
• Minimal External Components
• Space-saving 20-lead TSSOP
• 2 KB 1K x 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 Circuit
• 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

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 Block Diagram

Smart RF Wireless Data Microtransmitter

AT86RF401

LOOP FIL L1 L2

XTAL/CLK XTALB

OSCILLATOR

PHASE DETECTOR

LOOP FILTER

PRESCALER
÷ 24

B+ ANT RF AMP

ANTB

AVDD AGND

POWER SUPPLY SUPERVISOR

CLOCK RESET WATCHDOG LOW-VOLTAGE DETECT BROWN-OUT PROTECT

DATA

GAIN TRIM

RISC µC 2 KB Flash Program Memory 128 Bytes EEPROM Data Memory

DVDD DGND

IO5 IO4 IO3 SCK/IO2 SDO/IO1 SDI/IO0 RESETB

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 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 microcontroller, simplifies the implementation of user-specific, data-bit encoding routines, such as PWM or Manchester, for modulating the RF carrier. Thirty-six dB of RF power output control is available to the user in 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 µm Mixed Signal CMOS + EEPROM process, enabling true system-level integration SLI .

Figure 20-lead TSSOP

ANTB 1 LOOPFIL 2

L1 3 L2 4 RESETB 5 N/C 6 I/O0 SDI 7 I/O1 SDO 8 I/O2 SCK 9 XTAL/CLK 10
20 ANT 19 N/C 18 AVDD 17 DVDD 16 AGND 15 DGND 14 I/O5 13 I/O4 12 I/O3 11 XTALB
2 AT86RF401

AT86RF401

Figure Sample Circuit

EXTERNAL LOOP FILTER OPTIONAL R1

V+ C2

S1 RESET SDI SDO SCLK

SPI Programming Interface
1 2 3 4 5 6 7 8 9 10

ANTB LOOPFIL L1 L2 RESETB NC IO0/SDI IO1/SDO IO2/SCLK XTAL/CLK
Ordering Information

RF Output 315 MHz 434 MHz 264 to 456 MHz
Ordering Code AT86RF401U AT86RF401E AT86RF401X

Package 20T

Application North American

European All Applications

AT86RF401

Temperature Operating Range
−40°C to 85°C −40°C to 85°C −40°C to 85°C

Package Drawing
20A2 TSSO

All devices are packaged on tape in reel standard reel quantity is 2,500 pieces.

L1 E E1

End View

Top View

COMMON DIMENSIONS Unit of Measure = mm

SYMBOL MIN NOM MAX NOTE

Side View

This drawing is for general information only. Please refer to JEDEC Drawing MO-153, Variation AC, for additional information.

Dimension D does not include mold Flash, protrusions or gate burrs. Mold Flash, protrusions and gate burrs shall not exceed mm in per side.

Dimension E1 does not include inter-lead Flash or protrusions. Inter-lead Flash and protrusions shall not exceed mm in per side.

Dimension b does not include Dambar protrusion. Allowable Dambar protrusion shall be mm total in excess of the b dimension at maximum material condition. Dambar cannot be located on the lower radius of the foot. Minimum space between protrusion and adjacent lead is mm.

Dimension D and E1 to be determined at Datum Plane H.
6/3/02
2325 Orchard Parkway R San Jose, CA 95131

TITLE 20A2, 20-lead x mm Body , pitch, Thin Shrink Small Outline Package TSSOP
20A2
50 AT86RF401

AT86RF401

Data Sheet Change Log

Please note that the page numbers referenced below apply to this document.

Changes from
• Updated text in Low Battery Detection section on page

Configuration Register section and became Table 21 page
• Updated text in Battery Low Configuration Register section page
• Renumbered tables as required to maintain proper sequence.
• Added Data Sheet Change Log section page
• Replaced “Power Control Register” with “AVR Configuration Register” in Button Detect Register section page
• Removed references to CFIL in Figures 1, 2, and 3 and Table
• Changed description of Bit[2] LOC in Transmit Control Register section page 30 from R/W to R and included additional descriptive text for Bit[5], Bit[4], and Bit[2].
• Added “Read Signature Byte” command to Serial Programming Instruction Set shown in Table 7 on page 15 and added Signature Bytes section on page
• Added note regarding maximum output power in Power Attenuation Control Register description section page
• Added text to “Button Reset” paragraph in the Reset Sources section page

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Datasheet ID: AT86RF401U-XI 519057