AT90USB647-MU Atmel, AT90USB647-MU Datasheet - Page 325
AT90USB647-MU
Manufacturer Part Number
AT90USB647-MU
Description
MCU, 8BIT, 64K FLASH, USB, 64QFN
Manufacturer
Atmel
Specifications of AT90USB647-MU
Controller Family/series
AT90
No. Of I/o's
48
Eeprom Memory Size
2KB
Ram Memory Size
4KB
Cpu Speed
16MHz
No. Of
RoHS Compliant
Core Size
8bit
Program Memory Size
64KB
Oscillator Type
External, Internal
Package
64QFN EP
Device Core
AVR
Family Name
AT90
Maximum Speed
20 MHz
Ram Size
4 KB
Operating Supply Voltage
3.3|5 V
Data Bus Width
8 Bit
Program Memory Type
Flash
Number Of Programmable I/os
48
Interface Type
SPI/TWI/USART/USB
On-chip Adc
8-chx10-bit
Operating Temperature
-40 to 85 °C
Number Of Timers
4
Lead Free Status / Rohs Status
Details
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7593K–AVR–11/09
where V
Table 25-3 on page 327
0x3FF represents the selected reference voltage minus one LSB.
If differential channels are used, the result is:
where V
GAIN the selected gain factor and V
in two’s complement form, from 0x200 (-512d) through 0x1FF (+511d). Note that if the user
wants to perform a quick polarity check of the result, it is sufficient to read the MSB of the result
(ADC9 in ADCH). If the bit is one, the result is negative, and if this bit is zero, the result is posi-
tive.
Table 82 shows the resulting output codes if the differential input channel pair (ADCn - ADCm) is
selected with a reference voltage of V
Figure 25-14. Differential Measurement Range
Figure 25-14
IN
POS
- V
is the voltage on the selected input pin and V
REF
is the voltage on the positive input pin, V
shows the decoding of the differential input range.
and
Table 25-4 on page
ADC
REF
Output Code
REF
0x3FF
ADC
=
the selected voltage reference. The result is presented
0x1FF
.
0x000
0x200
(
----------------------------------------------------------------------- -
V
=
POS
0
V
--------------------------
IN
V
–
⋅
REF
327). 0x000 represents analog ground, and
V
1023
NEG
NEG
V
REF
REF
) GAIN 512
⋅
the voltage on the negative input pin,
the selected voltage reference (see
AT90USB64/128
⋅
V
REF
Differential Input
Voltage (Volts)
325
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