ATmega1284PR231 Atmel Corporation, ATmega1284PR231 Datasheet - Page 113

• Manufacturer Part Number: ATmega1284PR231
• Manufacturer: Atmel Corporation

Specifications of ATmega1284PR231

• Flash (kbytes): 128 Kbytes
• Max. Operating Frequency: 20 MHz
• Max I/o Pins: 32
• Spi: 3
• Twi (i2c): 1
• Uart: 2
• Adc Channels: 8
• Adc Resolution (bits): 10
• Adc Speed (ksps): 15
• Analog Comparators: 1
• Crypto Engine: AES
• Sram (kbytes): 16
• Eeprom (bytes): 4096
• Operating Voltage (vcc): 1.8 to 3.6
• Timers: 3
• Frequency Band: 2.4 GHz
• Max Data Rate (mb/s): 2
• Antenna Diversity: Yes
• External Pa Control: Yes
• Power Output (dbm): 3
• Receiver Sensitivity (dbm): -101
• Receive Current Consumption (ma): 13.2
• Transmit Current Consumption (ma): 14.4
• Link Budget (dbm): 104

9.5
9.5.1
9.5.2
9.5.3
8111C–MCU Wireless–09/09
Battery Monitor (BATMON)
Overview
Configuration
Data Interpretation
The main features of the battery monitor are:
The battery monitor (BATMON) detects and indicates a low supply voltage of the external supply
voltage at pin 28 (EVDD). This is done by comparing the voltage on the external supply pin 28
(EVDD) with a configurable internal threshold voltage. A simplified schematic of the BATMON
with the most important input and output signals is shown in
Figure 9-6.
The BATMON can be configured using the register 0x11 (BATMON). 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), for details refer to register 0x11 (BATMON).
The signal bit BATMON_OK of register 0x11 (BATMON) monitors the current value of the bat-
tery voltage:
After setting a new threshold, the value BATMON_OK should be read out to verify the current
supply voltage value.
Note, the battery monitor is inactive during P_ON and SLEEP states, see status register 0x01
(TRX_STATUS).
• Configurable voltage threshold range: 1.7V to 3.675V
• Generates an interrupt when supply voltage drops below a threshold
• If BATMON_OK = 0, the battery voltage is lower than the threshold voltage
• If BATMON_OK = 1, the battery voltage is higher than the threshold voltage
BATMON_VTH
BATMON_HR
4
Simplified Schematic of BATMON
For input-to-output mapping
see control register
0x11 (BATMON)
DAC
Threshold
EVDD
Voltage
+
-
Figure 9-6 on page
„1“
BATMON_OK
D
clear
Q
AT86RF231
BATMON_IRQ
113.
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