ATmega1284PR231 Atmel Corporation, ATmega1284PR231 Datasheet - Page 12

• Manufacturer Part Number: ATmega1284PR231
• Manufacturer: Atmel Corporation

Specifications of ATmega1284PR231

• Flash (kbytes): 128 Kbytes
• Max. Operating Frequency: 20 MHz
• Max I/o Pins: 32
• Spi: 3
• Twi (i2c): 1
• Uart: 2
• Adc Channels: 8
• Adc Resolution (bits): 10
• Adc Speed (ksps): 15
• Analog Comparators: 1
• Crypto Engine: AES
• Sram (kbytes): 16
• Eeprom (bytes): 4096
• Operating Voltage (vcc): 1.8 to 3.6
• Timers: 3
• Frequency Band: 2.4 GHz
• Max Data Rate (mb/s): 2
• Antenna Diversity: Yes
• External Pa Control: Yes
• Power Output (dbm): 3
• Receiver Sensitivity (dbm): -101
• Receive Current Consumption (ma): 13.2
• Transmit Current Consumption (ma): 14.4
• Link Budget (dbm): 104

5. Application Circuits
5.1
8111C–MCU Wireless–09/09
Basic Application Schematic
A basic application schematic of the AT86RF231 with a single-ended RF connector is shown in
Figure 5-1 on page
RF port impedance using balun B1. The capacitors C1 and C2 provide AC coupling of the RF
input to the RF port, optional capacitor C4 improves matching if required.
Figure 5-1.
The power supply decoupling capacitors (CB2, CB4) are connected to the external analog sup-
ply pin (EVDD, pin 28) and external digital supply pin (DEVDD, pin 15). Capacitors CB1 and
CB3 are bypass capacitors for the integrated analog and digital voltage regulators to ensure sta-
ble operation. All decoupling and bypass capacitors should be placed as close as possible to the
pins and should have a low-resistance and low-inductance connection to ground to achieve the
best performance.
The crystal (XTAL), the two load capacitors (CX1, CX2), and the internal circuitry connected to
pins XTAL1 and XTAL2 form the crystal oscillator. To achieve the best accuracy and stability of
the reference frequency, large parasitic capacitances should be avoided. Crystal lines should be
RF
C4
Basic Application Schematic
B1
12. The 50Ω single-ended RF input is transformed to the 100Ω differential
C1
C2
1
2
3
4
5
6
7
8
DIG3
DIG4
AVSS
RFP
RFN
AVSS
DVSS
/RST
32
9
31
10 11 12 13 14 15 16
V
DD
30
CB1
AT86RF231
CB2
29
28
CB3
CX1
27
26
CB4
XTAL
25
CLKM
DVSS
DVSS
MOSI
MISO
SCLK
/SEL
IRQ
24
23
20
19
V
22
21
18
17
CX2
DD
AT86RF231
C3
R1
12