ATMEGA168-20AU Atmel, ATMEGA168-20AU Datasheet - Page 347
![IC AVR MCU 16K 20MHZ 32TQFP](/photos/6/91/69154/313-32-tqfp_sml.jpg)
ATMEGA168-20AU
Manufacturer Part Number
ATMEGA168-20AU
Description
IC AVR MCU 16K 20MHZ 32TQFP
Manufacturer
Atmel
Series
AVR® ATmegar
Datasheets
1.ATAVRTS2080B.pdf
(378 pages)
2.ATMEGA48-20AU.pdf
(35 pages)
3.ATMEGA168-20AU.pdf
(359 pages)
Specifications of ATMEGA168-20AU
Core Processor
AVR
Core Size
8-Bit
Speed
20MHz
Connectivity
I²C, SPI, UART/USART
Peripherals
Brown-out Detect/Reset, POR, PWM, WDT
Number Of I /o
23
Program Memory Size
16KB (8K x 16)
Program Memory Type
FLASH
Eeprom Size
512 x 8
Ram Size
1K 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
32-TQFP, 32-VQFP
Processor Series
ATMEGA16x
Core
AVR8
Data Bus Width
8 bit
Data Ram Size
1 KB
Interface Type
2-Wire, SPI, USART, Serial
Maximum Clock Frequency
20 MHz
Number Of Programmable I/os
23
Number Of Timers
3
Operating Supply Voltage
2.7 V to 5.5 V
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
10 bit, 8 Channel
Controller Family/series
AVR MEGA
No. Of I/o's
23
Eeprom Memory Size
512Byte
Ram Memory Size
1KB
Cpu Speed
20MHz
Rohs Compliant
Yes
For Use With
ATSTK600-TQFP32 - STK600 SOCKET/ADAPTER 32-TQFPATSTK600-DIP40 - STK600 SOCKET/ADAPTER 40-PDIP770-1007 - ISP 4PORT ATMEL AVR MCU SPI/JTAG770-1005 - ISP 4PORT FOR ATMEL AVR MCU JTAG770-1004 - ISP 4PORT FOR ATMEL AVR MCU SPIATAVRDRAGON - KIT DRAGON 32KB FLASH MEM AVRATAVRISP2 - PROGRAMMER AVR IN SYSTEMATJTAGICE2 - AVR ON-CHIP D-BUG SYSTEM
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
ATMEGA168-20AU
Manufacturer:
Atmel
Quantity:
132 113
Part Number:
ATMEGA168-20AU
Manufacturer:
ATMEL/爱特梅尔
Quantity:
20 000
Company:
Part Number:
ATMEGA168-20AU/TR
Manufacturer:
Atmel
Quantity:
16 000
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- Download datasheet (3Mb)
32. Errata
32.1
32.1.1
2545E–AVR–02/05
Errata ATmega48
Rev A
The revision letter in this section refers to the revision of the ATmega48 device.
•
•
•
•
•
1. Wrong values read after Erase Only operation
At supply voltages below 2.7 V, an EEPROM location that is erased by the Erase Only operation
may read as programmed (0x00).
If it is necessary to read an EEPROM location after Erase Only, use an Atomic Write operation
with 0xFF as data in order to erase a location. In any case, the Write Only operation can be used
as intended. Thus no special considerations are needed as long as the erased location is not
read before it is programmed.
2. Watchdog Timer Interrupt disabled
If the watchdog timer interrupt flag is not cleared before a new timeout occurs, the watchdog will
be disabled, and the interrupt flag will automatically be cleared. This is only applicable in inter-
rupt only mode. If the Watchdog is configured to reset the device in the watchdog time-out
following an interrupt, the device works correctly.
Make sure there is enough time to always service the first timeout event before a new watchdog
timeout occurs. This is done by selecting a long enough time-out period.
3. Start-up time with Crystal Oscillator is higher than expected
The clock counting part of the start-up time is about 2 times higher than expected for all start-up
periods when running on an external Crystal. This applies only when waking up by reset. Wake-
up from power down is not affected. For most settings, the clock counting parts is a small frac-
tion of the overall start-up time, and thus, the problem can be ignored. The exception is when
using a very low frequency crystal like for instance a 32 kHz clock crystal.
No known workaround.
4. High Power Consumption in Power-down with External Clock
The power consumption in power down with an active external clock is about 10 times higher
than when using internal RC or external oscillators.
Stop the external clock when the device is in power down.
5. Asynchronous Oscillator does not stop in Power-down
Wrong values read after Erase Only operation
Watchdog Timer Interrupt disabled
Start-up time with Crystal Oscillator is higher than expected
High Power Consumption in Power-down with External Clock
Asynchronous Oscillator does not stop in Power-down
Problem Fix/Workaround
Problem fix / Workaround
Problem fix / Workaround
Problem fix / Workaround
ATmega48/88/168
347
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