ATMEGA128RFA1-ZU Atmel, ATMEGA128RFA1-ZU Datasheet - Page 109

• 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

9.12.10 PHY_RSSI – Receiver Signal Strength Indicator Register
8266B-MCU Wireless-03/11
The PHY_RSSI register is a multi purpose register that indicates FCS validity, provides
random numbers and shows the current RSSI value.
• Bit 7 – RX_CRC_VALID - Received Frame CRC Status
Reading this register bit indicates whether the last received frame has a valid FCS or
not. The register bit is updated when issuing a TRX24_RX_END interrupt and remains
valid until the next TRX24_RX_END interrupt is issued, caused by a new frame
reception.
Table 9-39 RX_CRC_VALID Register Bits
• Bit 6:5 – RND_VALUE1:0 - Random Value
reading register bits RND_VALUE. The value can be used for random numbers for
security applications. Note that the radio transceiver shall be in Basic Operating Mode
receive state. The values are updated every 1 µs.
• Bit 4:0 – RSSI4:0 - Receiver Signal Strength Indicator
The result of the automated RSSI measurement is stored in these register bits. The
value is updated every 2µs in receive states. The read value is a number between 0
and 28 indicating the received signal strength as a linear curve on a logarithmic input
power scale (dBm) with a resolution of 3 dB. A RSSI value of 0 indicates a RF input
power lower than RSSI_BASE_VAL (-90 dBm). A value of 28 marks a power higher or
equal to -10 dBm.
Table 9-40 RSSI Register Bits
Bit
NA ($146)
Read/Write
Initial Value
Bit
NA ($146)
Read/Write
Initial Value
Register Bits
RX_CRC_VALID
Register Bits
RSSI4:0
RX_CRC_VALID
RSSI3
R
R
7
0
3
0
RND_VALUE1
RSSI2
R
R
6
0
2
0
Value
Value
28
0
1
0
1
2
A 2-bit random value can be retrieved by
RND_VALUE0
RSSI1
Description
CRC (FCS) not valid
CRC (FCS) valid
Description
Minimum RSSI value: P(RF) < -90 dBm
P(RF) = RSSI_BASE_VAL+3 · (RSSI-1)
[dBm]
...
Maximum RSSI value: P(RF)
R
R
5
0
1
0
ATmega128RFA1
RSSI4
RSSI0
R
R
4
0
0
0
PHY_RSSI
PHY_RSSI
-10 dBm
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