ATMEGA256RZAV-8AU Atmel, ATMEGA256RZAV-8AU Datasheet - Page 62

• Manufacturer Part Number: ATMEGA256RZAV-8AU
• Description: MCU ATMEGA2561/AT86RF230 64-TQFP
• Manufacturer: Atmel
• Series: ATMEGAr

Specifications of ATMEGA256RZAV-8AU

• Frequency: 2.4GHz
• Modulation Or Protocol: 802.15.4 Zigbee
• Applications: ISM, ZigBee™
• Power - Output: 3dBm
• Sensitivity: -101dBm
• Voltage - Supply: 1.8 V ~ 3.6 V
• Current - Receiving: 15.5mA
• Current - Transmitting: 16.5mA
• Data Interface: PCB, Surface Mount
• Memory Size: 256kB Flash, 4kB EEPROM, 8kB RAM
• Antenna Connector: PCB, Surface Mount
• Package / Case: 64-TQFP
• Wireless Frequency: 2.4 GHz
• Interface Type: JTAG, SPI
• Output Power: 3 dBm
• For Use With: ATAVRISP2 - PROGRAMMER AVR IN SYSTEM
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Operating Temperature: -
• Data Rate - Maximum: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• For Use With/related Products: ATmega256

9.4 Voltage Regulators (AVREG, DVREG)
9.4.1 Overview
62
AT86RF230
the SPI transfer rate shall be lower than 250 Kbit/s to ensure no TRX_UR interrupt
occurs.
Note, during the Frame Buffer read access the TRX_UR interrupt is first valid 64 µs
after the RX_START interrupt. The occurrence of the interrupt can be disregarded when
reading the first byte of the Frame Buffer between 32 µs and 64 µs after the
RX_START interrupt.
If a received frame upload is delayed and during the upload process a new frame is
received, a TRX_UR and an RX_START interrupt occurs. Even so, the old frame data
can be read, if the SPI data rate is higher than the effective over air data rate. A
minimum SPI clock rate of 1 MHz is recommended in this special case. Finally it is
required to check the uploaded frame data integrity by a FCS using the microcontroller.
When writing data to the Frame Buffer during frame transmission, the SPI transfer rate
shall be higher than 250 Kbit/s to ensure no TRX_UR interrupt occurs. The first byte of
the PSDU data must be available in the Frame Buffer before SFD transmission has
been completed, which takes 176 µs (16 µs PA ramp up + 128 µs preamble
transmission + 32 µs SFD transmission) from the rising edge of SLP_TR pin (see
Figure 7-2).
The main features of the Voltage Regulator modules are:
• Bandgap stabilized 1.8V supply for analog and digital domain.
• Low dropout (LDO) voltage regulator
• Configurable for usage of external voltage regulator
The internal voltage regulators supply the low voltage domains of the AT86RF230. The
AVREG provides the regulated 1.8V supply voltage for the analog section and the
DVREG supplies the 1.8V supply voltage for the digital section. A simplified schematic
of the internal voltage regulator is shown in Figure 9-2.
Figure 9-2. Simplified Schematic of AVREG/DVREG
reference
Bandgap
voltage
1.25V
DEVDD / EVDD
DVDD / AVDD
5131E-MCU Wireless-02/09