ATMEGA128RFA1-ZU Atmel, ATMEGA128RFA1-ZU Datasheet - Page 180

• 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

13.2.4 Watchdog Reset
13.3 Internal Voltage Reference
180
ATmega128RFA1
Figure 13-5. Brown-out Reset During Operation
When the Watchdog times out, it will generate a short reset pulse of one CK cycle
duration. On the falling edge of this pulse, the delay timer starts counting the Time-out
period t
Watchdog Timer.
Figure 13-6. Watchdog Reset During Operation
ATmega128RFA1 features an internal bandgap reference. This reference is used for
Brown-out Detection, and it can be used as an input to the Analog Comparator or the
ADC.
Voltage Reference Enable Signals and Start-up Time
The voltage reference has a start-up time that may influence the way it should be used.
The start-up time is given in
power, the reference is not always turned on. The reference is on during the following
situations:
1. When the BOD is enabled (by programming the BODLEVEL [2:0] Fuse).
2. When the bandgap reference is connected to the Analog Comparator (by setting the
3. When the ADC is enabled.
Thus, when the BOD is not enabled, after setting the ACBG bit or enabling the ADC,
the user must always allow the reference to start up before the output from the Analog
Comparator or ADC is used. To reduce power consumption in Power-down mode, the
user can avoid the three conditions above to ensure that the reference is turned off
before entering Power-down mode.
INTERNAL
INTERNAL
TIME-OUT
TIME-OUT
TIME-OUT
DEVDD
RESET
RESET
RESET
ACBG bit in ACSR).
EVDD
RSTN
RSTN
WDT
TOUT
. See
V
BOT-
"Watchdog Timer" on
1 CK Cycle
t
TOUT
"System and Reset Characteristics" on page
V
BOT+
t
TOUT
page 181. for details on operation of the
8266B-MCU Wireless-03/11
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