AT90PWM81 Atmel Corporation, AT90PWM81 Datasheet - Page 221
AT90PWM81
Manufacturer Part Number
AT90PWM81
Description
Manufacturer
Atmel Corporation
Datasheet
1.AT90PWM161.pdf
(325 pages)
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
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17.8.4.2
17.8.5
17.8.6
17.9
7734P–AVR–08/10
Amplifier
Digital Input Disable Register 0 – DIDR0
Digital Input Disable Register 1– DIDR1
ADLAR = 1
• Bit 7:0 – ADC7D..ADC0D: AMP0-D and ADC7:0 Digital Input Disable
When this bit is written logic one, the digital input buffer on the corresponding ADC pin is disabled. The
corresponding PIN Register bit will always read as zero when this bit is set. When an analog signal is
applied to the ADC7..0 pin and the digital input from this pin is not needed, this bit should be written logic
one to reduce power consumption in the digital input buffer.
• Bit 2:0 – AMP0+D and ADC10:8 Digital Input Disable
When this bit is written logic one, the digital input buffer on the corresponding ADC pin is disabled. The
corresponding PIN Register bit will always read as zero when this bit is set. When an analog signal is
applied to an analog pin and the digital input from this pin is not needed, this bit should be written logic
one to reduce power consumption in the digital input buffer.
The AT90PWM81 features one differential amplified channel with programmable 5, 10, 20, and 40 gain
stage. Despite the result is given by the 10 bit ADC, the amplifier has been sized to give a 8bits resolution.
The negative input on the amplifier can be internally switched to the analog ground. However, amplifier
characteristics are specified with differential inputs.
Because the amplifier is a switching capacitor amplifier, it needs to be clocked by a synchronization signal
called in this document the amplifier synchronization clock. The amplifier samples the input value at the
falling edge of the synchronization signal. This allow to measure analog signals with same period as the
synchronization. The maximum clock for the amplifier is 250kHz.
Bit
Read/Write
Initial Value
Bit
Read/Write
Initial Value
Bit
Read/Write
Initial Value
7
ADC8D
AMP3D
R/W
0
7
-
-
0
7
ADC9
ADC1
R
R
0
0
6
ADC7D
AMP0-D
R/W
0
6
-
-
0
6
ADC8
ADC0
R
R
0
0
5
ADC5D
ACMP2D
R/W
0
5
-
R/W
0
5
ADC7
-
R
R
0
0
0
4
ADC4D
ACMP3MD
R/W
0
4
-
R/W
4
ADC6
-
R
R
0
0
3
ADC3D
ACMPMD
R/W
0
3
ACMP1MD AMP0+D
R/W
0
3
ADC5
-
R
R
0
0
2
ADC2D
ACMP2MD
R/W
0
2
R/W
0
2
ADC4
-
R
R
0
0
1
ADC1D
R/W
0
1
ADC10D
R/W
0
1
ADC3
-
R
R
0
0
AT90PWM81
0
ADC0D
ACMP1D
R/W
0
0
ADC9D
R/W
0
0
ADC2
-
R
R
0
0
DIDR0
DIDR1
ADCH
ADCL
221
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