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AT86RF232
In transmit mode, a control loop provides a common-mode voltage of 0.9V. Transistor
M0 is off, allowing the PA to set the common-mode voltage. The common-mode
capacitance at each pin to ground shall be < 30pF to ensure the stability of this
common-mode feedback loop.
In receive mode, the RF port provides a low-impedance path to ground when transistor
M0, see Figure 1-2 , pulls the inductor center tap to ground. A DC voltage drop of 20mV
across the on-chip inductor can be measured at the RF pins.
1.2.3 Crystal Oscillator Pins
XTAL1, XTAL2
The pin 26 (XTAL1) of Atmel AT86RF232 is the input of the reference oscillator
amplifier (XOSC), the pin 25 (XTAL2) is the output. A detailed description of the crystal
oscillator setup and the related XTAL1/XTAL2 pin configuration can be found in
Section 9.6 .
When using an external clock reference signal, XTAL1 shall be used as input pin. For
further details, refer to Section 9.6.3 .
1.2.4 Analog Pin Summary
Table 1-2. Analog Pin Behavior – DC values.
Pin
RFP/RFN
XTAL1/XTAL2
DVDD
AVDD
Values and Conditions
V DC = 0.9V (BUSY_TX)
V DC = 20mV (receive states)
V DC = 0mV (otherwise)
V DC = 0.9V at both pins
C PAR = 3pF
V DC = 1.8V (all states, except SLEEP)
V DC = 0mV (otherwise)
V DC = 1.8V (all states, except P_ON,
SLEEP, RESET, and TRX_OFF)
V DC = 0mV (otherwise)
Comments
DC level at pins RFP/RFN for various transceiver states.
AC coupling is required if a circuitry with DC path to ground or
supply is used. Serial capacitance and capacitance of each pin
to ground must be < 30pF.
DC level at pins XTAL1/XTAL2 for various transceiver states.
Parasitic capacitance (C par ) of the pins must be considered as
additional load capacitance to the crystal.
DC level at pin DVDD for various transceiver states.
Supply pins (voltage regulator output) for the digital 1.8V
voltage domain, recommended bypass capacitor 100nF.
DC level at pin AVDD for various transceiver states.
Supply pin (voltage regulator output) for the analog 1.8V
voltage domain, recommended bypass capacitor 100nF.
5
8321A – MCU Wireless – 10/11
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