ATMEGA128RFA1-ZU Atmel, ATMEGA128RFA1-ZU Datasheet - Page 354

• Manufacturer Part Number: ATMEGA128RFA1-ZU
• Description: IC AVR MCU 2.4GHZ XCEIVER 64QFN
• Manufacturer: Atmel
• Series: ATMEGAr

Specifications of ATMEGA128RFA1-ZU

• Frequency: 2.4GHz
• Data Rate - Maximum: 2Mbps
• Modulation Or Protocol: 802.15.4 Zigbee
• Applications: General Purpose
• Power - Output: 3.5dBm
• Sensitivity: -100dBm
• Voltage - Supply: 1.8 V ~ 3.6 V
• Current - Receiving: 12.5mA
• Current - Transmitting: 14.5mA
• Data Interface: PCB, Surface Mount
• Memory Size: 128kB Flash, 4kB EEPROM, 16kB RAM
• Antenna Connector: PCB, Surface Mount
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 64-VFQFN, Exposed Pad
• Rf Ic Case Style: QFN
• No. Of Pins: 64
• Supply Voltage Range: 1.8V To 3.6V
• Operating Temperature Range: -40°C To +85°C
• Svhc: No SVHC (15-Dec-2010)
• Rohs Compliant: Yes
• Processor Series: ATMEGA128x
• Core: AVR8
• Data Bus Width: 8 bit
• Program Memory Type: Flash
• Program Memory Size: 128 KB
• Data Ram Size: 16 KB
• Interface Type: JTAG
• Maximum Clock Frequency: 16 MHz
• Number Of Programmable I/os: 38
• Number Of Timers: 6
• Operating Supply Voltage: 1.8 V to 3.6 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• 3rd Party Development Tools: EWAVR, EWAVR-BL
• Development Tools By Supplier: ATAVR128RFA1-EK1
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

354
ATmega128RFA1
The following equations can be used to calculate the ratio of the incoming data rate and
internal receiver baud rate.
D
S
S
S
R
R
Table 23-2 below
can be tolerated. Note that normal speed mode has higher tolerance of baud rate
variations.
Table 23-2. Recommended Maximum Receiver Baud Rate Error for Normal Speed Mode
Table 23-3. Recommended Maximum Receiver Baud Rate Error for Double Speed
The recommendations of the maximum receiver baud rate error were made under the
assumption that the receiver and transmitter equally divides the maximum total error.
There are two possible sources for the receiver baud rate error. The receiver’s system
clock will always have some minor instability over the supply voltage range and the
temperature range. When using the radio transceiver crystal oscillator (XOSC) to
generate the system clock, this is rarely a problem, but for the internal RC oscillator the
system clock may differ more than 2% over the temperature range. The second source
for the error is more controllable. The baud rate generator can not always do an exact
D
# (Data+Parity Bit)
5
6
7
8
9
10
D
# (Data+Parity Bit)
5
6
7
8
9
10
F
M
slow
fast
Sum of character size and parity size (D = 5 to 10 bit)
Samples per bit. S = 16 for normal speed mode and S = 8 for double speed
mode.
First sample number used for majority voting. S
S
Middle sample number used for majority voting. S
S
is the ratio of the slowest incoming data rate that can be accepted in relation to
the receiver baud rate.
is the ratio of the fastest incoming data rate that can be accepted in relation to
the receiver baud rate.
F
M
R
= 4 for double speed mode.
= 5 for double speed mode.
slow
(U2Xn = 0)
Mode (U2Xn = 1)
=
S
and
−
1
R
93.20
94.12
94.81
95.36
95.81
96.17
R
94.12
94.92
95.52
96.00
96.39
96.70
Table 23-3 below
(
slow
slow
+
D
D
+
(%)
(%)
) 1
⋅
S
S
+
S
R
106.67
105.79
105.11
104.58
104.14
103.78
R
105.66
104.92
104,35
103.90
103.53
103.23
F
fast
fast
(%)
(%)
list the maximum receiver baud rate error that
Max Total Error (%)
+6.67/-6.8
+5.79/-5.88
+5.11/-5.19
+4.58/-4.54
+4.14/-4.19
+3.78/-3.83
Max Total Error (%)
+5.66/-5.88
+4.92/-5.08
+4.35/-4.48
+3.90/-4.00
+3.53/-3.61
+3.23/-3.30
R
fast
F
=
M
= 8 for normal speed and
(
= 9 for normal speed and
D
(
+
D
) 1
+
8266A-MCU Wireless-12/09
Recommended Max
Receiver Error (%)
± 3.0
± 2.5
± 2.0
± 2.0
± 1.5
± 1.5
Recommended Max
Receiver Error (%)
± 2.5
± 2.0
± 1.5
± 1.5
± 1.5
± 1.0
S
) 2
+
S
S
MF