ATMEGA128RFA1-ZU Atmel, ATMEGA128RFA1-ZU Datasheet - Page 178

• 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

13.2.2 External Reset
13.2.3 Brown-out Detection
178
ATmega128RFA1
Figure 13-3. MCU Start-up, RSTN Extended Externally
An External Reset is generated by a low level on the RSTN pin. Reset pulses longer
than the minimum pulse width (see
will generate a reset, even if the clock is not running. Shorter pulses are not guaranteed
to generate a reset. When the applied signal reaches the Reset Threshold Voltage –
V
t
Figure 13-4. Reset During Operation
ATmega128RFA1 has an On-chip Brown-out Detection (BOD) circuit for monitoring the
EVDD level during operation by comparing it to a fixed trigger level. The trigger level for
the BOD can be selected by the BODLEVEL Fuses. The trigger level has a hysteresis
to ensure spike free Brown-out Detection. The hysteresis on the detection level should
be interpreted as V
When the BOD is enabled, and EVDD decreases to a value below the trigger level
(V
EVDD increases above the trigger level (V
counter starts the MCU after the Time-out period t
The BOD circuit will only detect a drop in EVDD if the voltage stays below the trigger
level for longer than t
INTERNAL
INTERNAL
TIME-OUT
TIME-OUT
TOUT
RST
BOT-
DEVDD
RESET
RESET
RSTN
RSTN
– on its positive edge, the delay counter starts the MCU after the Time-out period –
– has expired.
V
in
CC
Figure 13-5 on page
BOT+
BOD
V
V
POT
RST
= V
given in
BOT
179), the Brown-out Reset is immediately activated. When
+ V
"System and Reset Characteristics" on page
HYST
"System and Reset Characteristics" on page
/2 and V
V
RST
t
t
TOUT
TOUT
BOT+
BOT-
in
= V
TOUT
Figure 13-5 on page
BOT
has expired.
- V
HYST
/2.
8266A-MCU Wireless-12/09
179), the delay
502.
502)