AT86RF401E ATMEL [ATMEL Corporation], AT86RF401E Datasheet - Page 2

• Manufacturer Part Number: AT86RF401E
• Description: Smart RF Wireless Data Microtransmitter
• Manufacturer: ATMEL [ATMEL Corporation]

2
AT86RF401
In-system programmable, nonvolatile Flash program memory and EEPROM data stor-
age make possible rapid time-to-market and lower inventory costs.
In-system programmable, nonvolatile Flash program memory and EEPROM data stor-
age 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 Manches-
ter, 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 dif-
ferentially 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 pro-
cess, enabling true system-level integration (SLI).
Figure 2. 20-lead TSSOP
I/O1 (SDO)
I/O2 (SCK)
XTAL/CLK
I/O0 (SDI)
LOOPFIL
RESETB
ANTB
N/C
L1
L2
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
ANT
N/C
AVDD
DVDD
AGND
DGND
I/O5
I/O4
I/O3
XTALB
1424F–RKE–12/03