AT90PWM81 Atmel Corporation, AT90PWM81 Datasheet - Page 46

• Manufacturer Part Number: AT90PWM81
• Manufacturer: Atmel Corporation

Specifications of AT90PWM81

• Flash (kbytes): 8 Kbytes
• Pin Count: 20
• Max. Operating Frequency: 16 MHz
• Cpu: 8-bit AVR
• Hardware Qtouch Acquisition: No
• Max I/o Pins: 20
• Ext Interrupts: 3
• Usb Speed: No
• Usb Interface: No
• Spi: 1
• Graphic Lcd: No
• Video Decoder: No
• Camera Interface: No
• Adc Channels: 11
• Adc Resolution (bits): 10
• Adc Speed (ksps): 125
• Analog Comparators: 3
• Resistive Touch Screen: No
• Dac Channels: 1
• Dac Resolution (bits): 10
• Temp. Sensor: Yes
• Crypto Engine: No
• Sram (kbytes): 0.25
• Eeprom (bytes): 512
• Self Program Memory: YES
• Dram Memory: No
• Nand Interface: No
• Picopower: No
• Temp. Range (deg C): -40 to 125
• I/o Supply Class: 2.7 to 5.5
• Operating Voltage (vcc): 2.7 to 5.5
• Fpu: No
• Mpu / Mmu: no / no
• Timers: 1
• Output Compare Channels: 8
• Input Capture Channels: 1
• Pwm Channels: 6
• 32khz Rtc: No
• Calibrated Rc Oscillator: Yes

6.7.1
6.7.2
6.7.3
6.7.4
6.7.5
6.7.6
46
AT90PWM81
Analog to Digital Converter
Analog Comparator
Brown-out Detector
Internal Voltage Reference
Watchdog Timer
Port Pins
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 disabled
before entering any sleep mode. When the ADC is turned off and on again, the next conversion will be an
extended conversion. Refer to “CROSS REFERENCE REMOVED” for details on ADC operation.
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 NOT automatically disabled, so it should be disabled if
not used
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
configure the Analog 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 significantly to the total
current consumption. Refer to
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
up time.
If the Watchdog Timer is not needed in the application, the module should be turned off. If the Watchdog
Timer is enabled, it will be enabled in all sleep modes, and hence, always consume power. In the deeper
sleep modes, this will contribute significantly to the total current consumption. Refer to
Timer” on page 55
When entering a sleep mode, all port pins should be configured to use minimum power. The most impor-
tant is then to ensure that no pins drive resistive loads. In sleep modes where both the I/O clock (clk
and the ADC clock (clk
no power is consumed by the input logic when not needed. In some cases, the input logic is needed for
detecting wake-up conditions, and it will then be enabled. Refer to the section
details on which pins are enabled. If the input buffer is enabled and the input signal is left floating or have
an analog signal level close to V
for details on how to configure the Watchdog Timer.
ADC
) are stopped, the input buffers of the device will be disabled. This ensures that
“Brown-out Detection” on page 52
CC
/2, the input buffer will use excessive power.
“Internal Voltage Reference” on page 54
“Analog Comparator” on page 194
for details on how to configure the
“I/O-Ports” on page 66
for details on the start-
for details on how to
7734P–AVR–08/10
“Watchdog
I/O
for
)