ATMEGA3250P-20AU Atmel, ATMEGA3250P-20AU Datasheet - Page 237
![IC MCU AVR 32K FLASH 100-TQFP](/photos/6/70/67048/313-100-tqfp_sml.jpg)
ATMEGA3250P-20AU
Manufacturer Part Number
ATMEGA3250P-20AU
Description
IC MCU AVR 32K FLASH 100-TQFP
Manufacturer
Atmel
Series
AVR® ATmegar
Specifications of ATMEGA3250P-20AU
Core Processor
AVR
Core Size
8-Bit
Speed
20MHz
Connectivity
SPI, UART/USART, USI
Peripherals
Brown-out Detect/Reset, POR, PWM, WDT
Number Of I /o
69
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
100-TQFP, 100-VQFP
Processor Series
ATMEGA32x
Core
AVR8
Data Bus Width
8 bit
Data Ram Size
2 KB
Interface Type
SPI/UART/USI
Maximum Clock Frequency
20 MHz
Number Of Programmable I/os
69
Number Of Timers
3
Maximum Operating Temperature
+ 85 C
Mounting Style
SMD/SMT
3rd Party Development Tools
EWAVR, EWAVR-BL
Development Tools By Supplier
ATAVRDRAGON, ATSTK500, ATSTK600, ATAVRISP2, ATAVRONEKIT
Minimum Operating Temperature
- 40 C
On-chip Adc
8-ch x 10-bit
For Use With
ATSTK600-TQFP100 - STK600 SOCKET/ADAPTER 100-TQFP770-1007 - ISP 4PORT ATMEL AVR MCU SPI/JTAG770-1005 - ISP 4PORT FOR ATMEL AVR MCU JTAG770-1004 - ISP 4PORT FOR ATMEL AVR MCU SPIATAVRISP2 - PROGRAMMER AVR IN SYSTEMATSTK504 - STARTER KIT AVR EXP MOD 100P LCD
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Other names
ATMEGA3250P-16AU
ATMEGA3250P-16AU
ATMEGA3250P-16AU
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Part Number:
ATMEGA3250P-20AU
Manufacturer:
AT
Quantity:
20 000
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23.5.5
8023F–AVR–07/09
Scanning the ADC
Table 23-3.
Figure 23-8
Boundary-scan cell from
used for pure connectivity testing, since all analog inputs are shared with a digital port pin as
well.
Figure 23-8. 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
input
output
input
input
Boundary-scan Signals for the Analog Comparator
SCTEST
AMPEN
ACLK
ST
Figure 23-4
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
23-4.
PASSEN
ACTEN
1.22V
GNDEN
ref
1.11V
ref
Recommended
Input when Not
in Use
Will become input
to µC code being
executed
ATmega325P/3250P
PRECH
DAC_9..0
ADCEN
HOLD
1
0
0
PRECH
AREF
10-bit DAC
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
AREF
+
-
DACOUT
0
COMP
COMP
237
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