ATmega1284RZAP Atmel Corporation, ATmega1284RZAP Datasheet - Page 43

• Manufacturer Part Number: ATmega1284RZAP
• Manufacturer: Atmel Corporation

Specifications of ATmega1284RZAP

• 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: No
• 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): 0.25
• Antenna Diversity: No
• External Pa Control: No
• Power Output (dbm): 3
• Receiver Sensitivity (dbm): -101
• Receive Current Consumption (ma): 16.0
• Transmit Current Consumption (ma): 17.0
• Link Budget (dbm): 104

8.10
8.11
8.11.1
8.11.2
8.11.3
8.11.4
8059D–AVR–11/09
Power Reduction Registers
Minimizing Power Consumption
Analog to Digital Converter
Analog Comparator
Brown-out Detector
Internal Voltage Reference
The Power Reduction Registers (PRR0 and PRR1), see
clock to individual peripherals to reduce power consumption. The current state of the peripheral
is frozen and the I/O registers can not be read or written. Resources used by the peripheral
when stopping the clock will remain occupied, hence the peripheral should in most cases be dis-
abled before stopping the clock. Waking up a module, which is done by clearing the bit in
PRR0/PRR1, puts the module in the same state as before shutdown.
Module shutdown can be used in Idle mode and Active mode to significantly reduce the overall
power consumption. In all other sleep modes, the clock is already stopped.
There are several issues to consider when trying to minimize the power consumption in an AVR
controlled system. In general, sleep modes should be used as much as possible, and the sleep
mode should be selected so that as few as possible of the device’s functions are operating. All
functions not needed should be disabled. In particular, the following modules may need special
consideration when trying to achieve the lowest possible power consumption.
If enabled, the ADC will be enabled in all sleep modes. To save power, the ADC should be dis-
abled before entering any sleep mode. When the ADC is turned off and on again, the next
conversion will be an extended conversion. Refer to
240
When entering Idle mode, the Analog Comparator should be disabled if not used. When entering
ADC Noise Reduction mode, the Analog Comparator should be disabled. In other sleep modes,
the Analog Comparator is automatically disabled. However, if the Analog Comparator is set up
to use the Internal Voltage Reference as input, the Analog Comparator should be disabled in all
sleep modes. Otherwise, the Internal Voltage Reference will be enabled, independent of sleep
mode. Refer to
log Comparator.
If the Brown-out Detector is not needed by the application, this module should be turned off. If
the Brown-out Detector is enabled by the BODLEVEL Fuses, it will be enabled in all sleep
modes, and hence, always consume power. In the deeper sleep modes, this will contribute sig-
nificantly to the total current consumption. Refer to
on how to configure the Brown-out Detector.
The Internal Voltage Reference will be enabled when needed by the Brown-out Detection, the
Analog Comparator or the ADC. If these modules are disabled as described in the sections
above, the internal voltage reference will be disabled and it will not be consuming power. When
turned on again, the user must allow the reference to start up before the output is used. If the
reference is kept on in sleep mode, the output can be used immediately. Refer to
age Reference” on page 52
for details on ADC operation.
”AC - Analog Comparator” on page 237
for details on the start-up time.
”Brown-out Detection” on page 51
”ADC - Analog-to-digital Converter” on page
for details on how to configure the Ana-
page
46, provides a method to stop the
ATmega1284P
”Internal Volt-
for details
43