ATMEGA128RFA1-ZU Atmel, ATMEGA128RFA1-ZU Datasheet - Page 80

• 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

9.6.4 Battery Monitor (BATMON)
9.6.4.1 Overview
9.6.4.2 Configuration
9.6.4.3 Data Interpretation
80
ATmega128RFA1
The PHR and the PSDU need to be stored in the Frame Buffer for frame transmission.
The PHR byte is the first byte in the Frame Buffer (address 0x180) and must be
calculated based on the PHR and the PSDU. The maximum frame size supported by
the radio transceiver is 128 bytes. If the TX_AUTO_CRC_ON bit is set in register
PHY_TX_PWR, the FCS field of the PSDU is replaced by the automatically calculated
FCS during frame transmission. There is no need to write the FCS field when using the
automatic FCS generation.
Manipulating individual bytes of the Frame Buffer is simply possible by accessing the
appropriate buffer address.
The minimum frame length supported by the radio transceiver for non IEEE 802.15.4
compliant frames is one byte (Frame Length Field + 1 byte of data).
The main features of the battery monitor are:
• Configurable voltage threshold range from 1.7V to 3.675V
• Generates an interrupt when supply voltage drops below the threshold
The battery monitor (BATMON) detects and indicates a low supply voltage of EVDD.
This is done by comparing the voltage of EVDD with a configurable, internal threshold
voltage. A simplified schematic of the BATMON with the most important input and
output signals is shown in the following figure.
Figure 9-24. Simplified Schematic of BATMON
The Battery Monitor can be configured using the BATMON register. Register subfield
BATMON_VTH sets the threshold voltage. It is configurable with a resolution of 75 mV
in the upper voltage range (BATMON_HR = 1) and with a resolution of 50 mV in the
lower voltage range (BATMON_HR = 0).
The bit BATMON_OK of register BATMON monitors the current value of the battery
voltage:
• If BATMON_OK = 0 then the battery voltage is lower than the threshold voltage;
• If BATMON_OK = 1 then the battery voltage is higher than the threshold voltage;
BATMON_VTH
BATMON_HR
4
For input-to-output mapping
see BATMON register
DAC
Threshold
EVDD
Voltage
+
-
„1“
BATMON_OK
D
clear
Q
BATMON_IRQ
8266B-MCU Wireless-03/11