ATMEGA325-16AUR Atmel, ATMEGA325-16AUR Datasheet - Page 233
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ATMEGA325-16AUR
Manufacturer Part Number
ATMEGA325-16AUR
Description
MCU AVR 32K FLASH 16MHZ 64TQFP
Manufacturer
Atmel
Series
AVR® ATmegar
Datasheet
1.ATMEGA325-16AUR.pdf
(362 pages)
Specifications of ATMEGA325-16AUR
Core Processor
AVR
Core Size
8-Bit
Speed
16MHz
Connectivity
SPI, UART/USART, USI
Peripherals
Brown-out Detect/Reset, POR, PWM, WDT
Number Of I /o
54
Program Memory Size
32KB (16K x 16)
Program Memory Type
FLASH
Eeprom Size
1K x 8
Ram Size
2K x 8
Voltage - Supply (vcc/vdd)
2.7 V ~ 5.5 V
Data Converters
A/D 8x10b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
*
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
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24.6.5
2570M–AVR–04/11
Scanning the ADC
Table 24-4.
Figure 24-9
Boundary-scan cell from
used for pure connectivity testing, since all analog inputs are shared with a digital port pin as
well.
Figure 24-9. Analog to Digital Converter
The signals are described briefly in
Signal
Name
AC_IDLE
ACO
ACME
ACBG
NEGSEL_2
NEGSEL_1
NEGSEL_0
MUXEN_7
MUXEN_6
MUXEN_5
MUXEN_4
MUXEN_3
MUXEN_2
MUXEN_1
MUXEN_0
EXTCH
ADC_7
ADC_6
ADC_5
ADC_4
ADC_3
ADC_2
ADC_1
ADC_0
ADC_2
ADC_0
shows a block diagram of the ADC with all relevant control and observe signals. The
ADC_1
Direction as
Seen from the
Comparator
Boundary-scan Signals for the Analog Comparator
output
input
input
input
SCTEST
AMPEN
ACLK
ST
Figure 24-5
To Comparator
Description
Turns off Analog
Comparator when
true
Analog
Comparator Output
Uses output signal
from ADC mux
when true
Bandgap
Reference enable
+
-
1x
Table
ADCBGEN
is attached to each of these signals. The ADC need not be
VCCREN
IREFEN
AREF
24-5.
PASSEN
ATmega325/3250/645/6450
ACTEN
1.22V
GNDEN
ref
Recommended
Input when Not
in Use
Will become
input to µC code
being executed
1.11V
ref
1
0
0
PRECH
DAC_9..0
ADCEN
HOLD
Output Values when
Recommended
Inputs are Used
Depends upon µC
code being executed
Depends upon µC
code being executed
Depends upon µC
code being executed
PRECH
AREF
10-bit DAC
0
AREF
+
-
DACOUT
COMP
COMP
233
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