ATmega128RFA1 Atmel Corporation, ATmega128RFA1 Datasheet - Page 9

• Manufacturer Part Number: ATmega128RFA1
• Manufacturer: Atmel Corporation

Specifications of ATmega128RFA1

• Flash (kbytes): 128 Kbytes
• Max. Operating Frequency: 16 MHz
• Max I/o Pins: 38
• Spi: 1
• Twi (i2c): 1
• Uart: 1
• Adc Channels: 8
• Adc Resolution (bits): 10
• Analog Comparators: 1
• Crypto Engine: AES
• Sram (kbytes): 16
• Eeprom (bytes): 4096
• Operating Voltage (vcc): 1.8 to 3.6
• Timers: 6
• Frequency Band: 2.4 GHz
• Max Data Rate (mb/s): 2
• Antenna Diversity: Yes
• External Pa Control: Yes
• Power Output (dbm): 3.5
• Receiver Sensitivity (dbm): -100
• Receive Current Consumption (ma): 16.6
• Transmit Current Consumption (ma): 18.6
• Link Budget (dbm): 103.5

Table 4-1. Bill of Materials (BoM)
4.2 Extended Feature Set Application Schematic
8266CS-MCU Wireless-08/11
Designator
B1
CB1
CB3
CB2
CB4
CX1, CX2
CX3, CX4
C1, C2
C4 (optional) RF matching
XTAL
XTAL 32kHz Crystal
Description
SMD balun
SMD balun / filter
LDO VREG
bypass capacitor
Power supply bypass
capacitor
16MHz crystal load
capacitor
32.768kHz crystal load
capacitor
RF coupling capacitor
Crystal
Capacitors CB1 and CB3 are bypass capacitors for the integrated analog and digital
voltage regulators to ensure stable operation and to improve noise immunity.
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 16MHz crystal oscillator for the 2.4GHz
transceiver. To achieve the best accuracy and stability of the reference frequency, large
parasitic capacitances must be avoided. Crystal lines should be routed as short as
possible and not in proximity of digital I/O signals. This is especially required for the
High Data Rate Modes.
The 32.768 kHz crystal connected to the internal low power (sub 1µA) crystal oscillator
provides a stable time reference for all low power modes including 32 Bit IEEE 802.15.4
Symbol Counter
asynchronous timer T/C2
Total shunt capacitance including CX3, CX4 should not exceed 15pF across both pins.
The very low supply current of the oscillator requires careful layout of the PCB and any
leakage path must be avoided.
Crosstalk and radiation from switching digital signals to the crystal pins or the RF pins
can degrade the system performance. The programming of minimum drive strength
settings for the digital output signal is recommended (see
Strength Register
The ATmega128RFA1 supports additional features like:
• Security Module (AES)
• High Data Rate Mode up to 2MBits/s
• Antenna Diversity using alternate pin function DIG1/2 at Port G and F
(100nF minimum)
(100nF minimum)
CX-4025 16 MHz
SX-4025 16 MHz
12 … 25 pF
2.4 GHz
0.47 pF
Value
12 pF
22 pF
1 µF
1 µF
("MAC Symbol
0").
Manufacturer
Wuerth
Johanson
Technology
AVX
Murata
AVX
Murata
Epcos
Epcos
AVX
Johnstech
ACAL Taitjen
Siward
("Timer/Counter2 with PWM and Asynchronous
Counter") and real time clock application using the
Part Number
748421245
2450FB15L0001
0603YD105KAT2A
GRM188R61C105KA12D
06035A120JA
GRP1886C1H120JA01
B37930
B37920
06035A220JAT2A
XWBBPL-F-1
A207-011
ATmega128RFA1
"DPDS0 - Port Driver
Comment
Filter included
X5R
(0603)
COG
(0603)
C0G
(0402 or 0603)
Rs=100 kOhm
10%
5%
5%
Operation").
16V
50V
50V
9