ATMEGA168-20MI Atmel, ATMEGA168-20MI Datasheet - Page 33
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ATMEGA168-20MI
Manufacturer Part Number
ATMEGA168-20MI
Description
IC AVR MCU 16K 20MHZ 32-QFN
Manufacturer
Atmel
Series
AVR® ATmegar
Specifications of ATMEGA168-20MI
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-VQFN Exposed Pad, 32-HVQFN, 32-SQFN, 32-DHVQFN
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
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8.7
2545S–AVR–07/10
128 kHz Internal Oscillator
Table 8-8.
Notes:
When this Oscillator is selected, start-up times are determined by the SUT Fuses as shown in
Table 8-9 on page
Table 8-9.
Note:
The 128 kHz internal Oscillator is a low power Oscillator providing a clock of 128 kHz. The fre-
quency is nominal at 3V and 25°C. This clock may be select as the system clock by
programming the CKSEL Fuses to “11” as shown in
Table 8-10.
Note:
When this clock source is selected, start-up times are determined by the SUT Fuses as shown in
Table
Table 8-11.
Note:
Power Conditions
BOD enabled
Fast rising power
Slowly rising power
BOD enabled
Fast rising power
Slowly rising power
Power Conditions
8-11.
1. The device is shipped with this option selected.
2. If 8 MHz frequency exceeds the specification of the device (depends on V
1. If the RSTDISBL fuse is programmed, this start-up time will be increased to
2.
1. Note that the 128 kHz oscillator is a very low power clock source, and is not designed for a
1. If the RSTDISBL fuse is programmed, this start-up time will be increased to
The device is shipped with this option selected.
Fuse can be programmed in order to divide the internal frequency by 8.
14CK + 4.1 ms to ensure programming mode can be entered.
high accuracy.
14CK + 4.1 ms to ensure programming mode can be entered.
Frequency Range (MHz)
Internal Calibrated RC Oscillator Operating Modes
Start-up times for the internal calibrated RC Oscillator clock selection
128 kHz Internal Oscillator Operating Modes
Start-up Times for the 128 kHz Internal Oscillator
33.
Nominal Frequency
7.3 - 8.1
128 kHz
Start-up Time from Power-
Start-up Time from Power-
down and Power-save
down and Power-save
Reserved
Reserved
6 CK
6 CK
6 CK
6 CK
6 CK
6 CK
Table
8-10.
Additional Delay from
Additional Delay from
ATmega48/88/168
Reset (V
14CK + 65 ms
14CK + 4.1 ms
(1)(2)
14CK + 64 ms
14CK + 4 ms
CKSEL3..0
14CK
14CK
Reset
0010
CC
CKSEL3..0
(1)
(1)
= 5.0V)
0011
(2)
CC
), the CKDIV8
SUT1..0
SUT1..0
00
01
10
11
00
01
10
11
33
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