Hardware Description
2-2 AT86RF211 Development Kit User Guide
5307C–WIRE–04/04
2.1 Power Supply You can work with 1 or 2 batteries (AA or AAA) as well as an external power supply
(connector J1).
Warning: The board is NOT protected against reversal, nor is a fuse mounted. Polarity
MUST always be respected. NEVER apply a voltage greater than 5V to this board. If
unused, BT2 battery must be replaced by a fuse F1 (typ. 0.2A). These instructions
remain valid regardless of what is made with these boards.
Plugging a jack connector automatically disconnects the batteries.
Note: The AT86RF211 dongle requires a 5V power supply to work properly, as well as
some AVR ISP dongles available on the market.
NO brown-out circuit is mounted on the board, since it depends on the user’s choice
of power supply voltage. Mounting such a circuit is very easy since a metallized hole
connected to the RESET is available close to Vcc and GND on the board (below the
“ISP” inscription).
2.2 AVR®
Motherboard The main features are:
An LCD for debugging purposes with its own step-up DC/DC converter U2 (5V output)
and level translator (U3). Since a DC/DC converter is a source of noise, its input is
filtered by a πstage (two low ESR tantalum capacitors and a 10Ωresistor). This
resistor may have to be adapted or replaced by an inductance if higher currents are to
be delivered.
Note: This 5V output is available for other circuits. If the AT86RF211 is powered through this 5V
converter, output noise could decrease the performances of the transceiver, and an addi-
tional relevant filtering stage would have to be added.
3 LEDs for debugging purposes: DL1 (green) and DL3 (red) are connected to
microcontroller ports. DL2 (yellow) is ON when the AT86RF211 is in reception or
transmit mode, thanks to comparator U7 (useful for debugging Wake-Up mode
protocols).
A 2.5V Voltage Reference for the A/D converter or any other application.
2 buttons for Hardware Reset (S3) or external interrupt (S4).
A 3-bit encoder (wheel) for the selection of any parameter you want.
GR1 to GR3 to manage the DATACLK signal as an External Interrupt, a Time Input
Capture or a standard Input Port depending on your needs. Demo software uses the
External Interrupt input pin.
GR4 to allow Wake-Up from AT86RF211 or External Wake-up (wired OR).
U1 and the components around it are unused, so the user can take advantage of
these footprints to place his own AOP and SMD components (also 3 footprints of
SMD packages on the other side).
A light sensor RV3.
Warning
5V max.
