ATmega168 Atmel Corporation, ATmega168 Datasheet - Page 308
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ATmega168
Manufacturer Part Number
ATmega168
Description
Manufacturer
Atmel Corporation
Specifications of ATmega168
Flash (kbytes)
16 Kbytes
Pin Count
32
Max. Operating Frequency
20 MHz
Cpu
8-bit AVR
# Of Touch Channels
16
Hardware Qtouch Acquisition
No
Max I/o Pins
23
Ext Interrupts
24
Usb Speed
No
Usb Interface
No
Spi
2
Twi (i2c)
1
Uart
1
Graphic Lcd
No
Video Decoder
No
Camera Interface
No
Adc Channels
8
Adc Resolution (bits)
10
Adc Speed (ksps)
15
Analog Comparators
1
Resistive Touch Screen
No
Temp. Sensor
No
Crypto Engine
No
Sram (kbytes)
1
Eeprom (bytes)
512
Self Program Memory
YES
Dram Memory
No
Nand Interface
No
Picopower
No
Temp. Range (deg C)
-40 to 85
I/o Supply Class
1.8 to 5.5
Operating Voltage (vcc)
1.8 to 5.5
Fpu
No
Mpu / Mmu
no / no
Timers
3
Output Compare Channels
6
Input Capture Channels
1
Pwm Channels
6
32khz Rtc
Yes
Calibrated Rc Oscillator
Yes
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29.6
Table 29-5
Serial Interface meets or exceeds these requirements under the noted conditions.
Timing symbols refer to
Table 29-5.
Notes:
2545T–AVR–05/11
Symbol
V
V
V
V
tr
tof
tSP
I
C
f
Rp
t
t
t
t
t
t
t
t
i
SCL
HD;STA
LOW
HIGH
SU;STA
HD;DAT
SU;DAT
SU;STO
BUF
(1)
IL
IH
hys
OL
i
(1)
(1)
(1)
(1)
(1)
2-wire serial interface characteristics
1. In ATmega48/88/168, this parameter is characterized and not 100% tested.
2. Required only for f
describes the requirements for devices connected to the 2-wire Serial Bus. The Atmel ATmega48/88/168 2-wire
Parameter
Input low-voltage
Input high-voltage
Hysteresis of schmitt trigger inputs
Output low-voltage
Rise time for both SDA and SCL
Output fall time from V
Spikes suppressed by input filter
Input current each I/O pin
Capacitance for each I/O pin
SCL clock frequency
Value of pull-up resistor
Hold time (repeated) START condition
Low period of the SCL clock
High period of the SCL clock
Setup time for a repeated START condition
Data hold time
Data setup time
Setup time for STOP condition
Bus free time between a STOP and START
condition
2-wire serial bus requirements.
Figure 29-4 on page
SCL
> 100kHz.
IHmin
to V
ILmax
309.
f
CK
(4)
10pF < C
0.1V
> max(16f
3mA sink current
f
f
f
f
f
f
f
f
f
f
f
f
f
f
f
f
f
f
SCL
SCL
SCL
SCL
SCL
SCL
SCL
SCL
SCL
SCL
SCL
SCL
SCL
SCL
SCL
SCL
SCL
SCL
CC
Condition
< V
≤ 100kHz
> 100kHz
≤ 100kHz
> 100kHz
≤ 100kHz
> 100kHz
≤ 100kHz
> 100kHz
≤ 100kHz
> 100kHz
≤ 100kHz
> 100kHz
≤ 100kHz
> 100kHz
≤ 100kHz
> 100kHz
≤ 100kHz
> 100kHz
b
< 400pF
SCL
i
< 0.9V
, 250kHz)
CC
(3)
(5)
20 + 0.1C
20 + 0.1C
V
--------------------------- -
V
--------------------------- -
0.05V
CC
CC
0.7V
ATmega48/88/168
3mA
3mA
Min.
-0.5
250
100
-10
4.0
0.6
4.7
1.3
4.0
0.6
4.7
0.6
4.0
0.6
4.7
1.3
–
–
0
0
–
0
0
0
0.4V
0.4V
CC
CC
b
b
(2)
(3)(2)
(3)(2)
V
0.3V
1000ns
---------------- -
CC
300ns
------------- -
Max.
50
3.45
300
250
400
0.4
0.9
C
10
10
C
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
+ 0.5
b
(2)
b
CC
Units
kHz
µA
pF
ns
µs
ns
µs
Ω
V
308