ATMEGA128RFA1-ZU Atmel, ATMEGA128RFA1-ZU Datasheet - Page 83
ATMEGA128RFA1-ZU
Manufacturer Part Number
ATMEGA128RFA1-ZU
Description
IC AVR MCU 2.4GHZ XCEIVER 64QFN
Manufacturer
Atmel
Series
ATMEGAr
Datasheets
1.ATMEGA128-16AU.pdf
(385 pages)
2.ATAVR128RFA1-EK1.pdf
(13 pages)
3.ATAVR128RFA1-EK1.pdf
(555 pages)
4.ATMEGA128RFA1-ZU.pdf
(524 pages)
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
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Part Number:
ATMEGA128RFA1-ZU
Manufacturer:
ATMEL/爱特梅尔
Quantity:
20 000
Company:
Part Number:
ATMEGA128RFA1-ZUR
Manufacturer:
ON
Quantity:
56 000
- ATMEGA128-16AU PDF datasheet
- ATAVR128RFA1-EK1 PDF datasheet #2
- ATAVR128RFA1-EK1 PDF datasheet #3
- ATMEGA128RFA1-ZU PDF datasheet #4
- Current page: 83 of 555
- Download datasheet (6Mb)
9.6.6 Frequency Synthesizer (PLL)
9.6.6.1 Overview
9.6.6.2 Frequency Agility
9.6.6.3 Calibration Loops
8266B-MCU Wireless-03/11
Figure 9-26. Setup for Using an External Frequency Reference
The main features of the phase-locked loop are:
• Generate RX/TX frequencies for all 2.4 GHz channels of IEEE 802.15.4;
• Autonomous calibration loops for stable operation within the operating range;
• Two PLL-interrupts for status indication;
• Fast PLL settling to support frequency hopping;
The PLL generates the RF frequencies for the radio transceiver. During receive
operation the frequency synthesizer works as a local oscillator for the receive frequency
of the radio transceiver. During transmit operation the voltage-controlled oscillator
(VCO) is directly modulated to generate the RF transmit signal. The frequency
synthesizer is implemented as a fractional-N PLL.
Two calibration loops ensure correct PLL functionality within the specified operating
limits.
When the PLL is enabled during state transition from TRX_OFF to PLL_ON the settling
time is typically t
(AVREG) and the PLL self calibration (refer to
of the PLL is indicated with a TRX24_PLL_LOCK interrupt.
Switching between 2.4 GHz ISM band channels in PLL_ON or RX_ON states is
typically done within t
frequency hopping applications.
The PLL frequency is changed to the transmit frequency within t
starting the transmit procedure and before starting the transmission. After the
transmission the PLL settles back to the receive frequency within t
frequency step does not generate a TRX24_PLL_LOCK or TRX24_PLL_UNLOCK
interrupt within these time spans.
Due to temperature, supply voltage and part-to-part variations of the radio transceiver
the VCO characteristics diverge. Two automated control loops are implemented to
ensure a stable operation: center frequency (CF) tuning and delay cell (DCU)
calibration. Both calibration loops are initiated automatically when the PLL is enabled
during state transition from TRX_OFF to PLL_ON. The center frequency calibration is
additionally initiated when the PLL changes to a center frequency of another channel.
It is recommended to initiate the calibration loops manually if the PLL operates for a
long time on the same channel e.g. more than 5 min or the operating temperature
XTAL1
TR4
= 110 µs including the settling time of the analog voltage regulator
TR20
16 MHz
= 11 µs. This makes the radio transceiver highly suitable for
XTAL2
IC internal
Table 9-8 on page
PCB
ATmega128RFA1
43Table 9-8). A lock
TR23
TR24
= 16 µs after
= 32 µs. This
83
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