ATMEGA649A-AU Atmel, ATMEGA649A-AU Datasheet - Page 35

IC MCU AVR 64K FLASH 64TQFP

ATMEGA649A-AU

Manufacturer Part Number
ATMEGA649A-AU
Description
IC MCU AVR 64K FLASH 64TQFP
Manufacturer
Atmel
Series
AVR® ATmegar
Datasheets

Specifications of ATMEGA649A-AU

Core Processor
AVR
Core Size
8-Bit
Speed
16MHz
Connectivity
SPI, UART/USART, USI
Peripherals
Brown-out Detect/Reset, LCD, POR, PWM, WDT
Number Of I /o
54
Program Memory Size
64KB (32K x 16)
Program Memory Type
FLASH
Eeprom Size
2K x 8
Ram Size
4K x 8
Voltage - Supply (vcc/vdd)
1.8 V ~ 5.5 V
Data Converters
A/D 8x10b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
64-TQFP
Processor Series
ATmega
Core
AVR
Data Bus Width
8 bit
Data Ram Size
4 KB
Interface Type
SPI, USART
Maximum Clock Frequency
16 MHz
Number Of Programmable I/os
54
Number Of Timers
3
Operating Supply Voltage
3.3 V
Maximum Operating Temperature
+ 85 C
Mounting Style
SMD/SMT
Minimum Operating Temperature
- 40 C
Operating Temperature Range
- 40 C to + 85 C
Lead Free Status / RoHS Status
Lead free / RoHS Compliant

Available stocks

Company
Part Number
Manufacturer
Quantity
Price
Part Number:
ATMEGA649A-AU
Manufacturer:
Atmel
Quantity:
10 000
Part Number:
ATMEGA649A-AUR
Manufacturer:
Atmel
Quantity:
10 000
8.7
8284A–AVR–10/10
External Clock
The Low-frequency Crystal Oscillator provides an internal load capacitance,
each TOSC pin.
Table 8-9.
The capacitance (Ce + Ci) needed at each TOSC pin can be calculated by using:
where
Ce - is optional external capacitors as described in
Ci - is the pin capacitance in
CL - is the load capacitance for a 32.768 kHz crystal specified by the crystal vendor.
C
Crystals specifying load capacitance (CL) higher than the ones given in the
external capacitors applied as described in
To find suitable load capacitance for a 32.768 kHz crystal, please consult the crystal datasheet.
The Low-frequency Crystal Oscillator must be selected by setting the CKSEL Fuses to “0110” or
“0111” as shown in
shown in
Table 8-10.
Table 8-11.
Note:
To drive the device from an external clock source, XTAL1 should be driven as shown in
8-3. To run the device on an external clock, the CKSEL Fuses must be programmed to “0000”.
ATmega169A/169PA/329A/329PA/3290A
S
CKSEL3...
ATmega169A/169PA/329A/329PA/649A/649P/3290A/3290PA/6490A/6490P
SUT1..0
- is the total stray capacitance for one TOSC pin.
0110
/3290PA/649A/649P/6490A/6490P
0111
00
01
10
11
0
(1)
1. This option should only be used if frequency stability at start-up is not important for the
Table
application
Capacitance for Low-frequency Oscillator.
Start-up Times for the Low-frequency Crystal Oscillator Clock Selection
Start-up Times for the Low-frequency Crystal Oscillator Clock Selection
Additional Delay from Reset (V
8-10.
Device
Table 8-11 on page
Power-down and Power-save
Start-up Time from
4 CK + 4.1 ms
4 CK + 65 ms
Table 8-10
32K CK
1K CK
4 CK
Ce
35. Start-up times are determined by the SUT Fuses as
+
32kHz Osc. Type
Ci
System Osc.
Figure 8-2 on page
Timer Osc.
CC
=
= 5.0V)
2 CL
Reserved
Figure 8-2 on page 33
C
s
Recommended Usage
Fast rising power or BOD enabled
Slowly rising power
Stable frequency at start-up
Recommended Usage
Stable frequency at start-up
Cap(Xtal1/Tosc1)
33.
16 pF
16 pF
Table
Cap(Xtal2/Tosc2)
seeTable 8-9
8-9, require
6 pF
6 pF
Figure
35
at

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