ATmega168P Atmel Corporation, ATmega168P Datasheet - Page 254

no-image

ATmega168P

Manufacturer Part Number
ATmega168P
Description
Manufacturer
Atmel Corporation
Datasheets

Specifications of ATmega168P

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
Yes
Crypto Engine
No
Sram (kbytes)
1
Eeprom (bytes)
512
Self Program Memory
YES
Dram Memory
No
Nand Interface
No
Picopower
Yes
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

Available stocks

Company
Part Number
Manufacturer
Quantity
Price
Part Number:
ATmega168P-20AN
Manufacturer:
Atmel
Quantity:
10 000
Part Number:
ATmega168P-20ANR
Manufacturer:
Atmel
Quantity:
10 000
Part Number:
ATmega168P-20AU
Manufacturer:
ATMEL
Quantity:
1 250
Part Number:
ATmega168P-20AU
Manufacturer:
Atmel
Quantity:
10 000
Part Number:
ATmega168P-20AUR
Manufacturer:
Atmel
Quantity:
10 000
Part Number:
ATmega168P-20MU
Manufacturer:
ATMEL
Quantity:
12 000
Part Number:
ATmega168PA-15AZ
Manufacturer:
VAC
Quantity:
120
Part Number:
ATmega168PA-15AZ
Manufacturer:
Atmel
Quantity:
10 000
Part Number:
ATmega168PA-15MZ
Manufacturer:
TOSHIBA
Quantity:
1 000
Part Number:
ATmega168PA-AU
Manufacturer:
Atmel
Quantity:
2 902
Company:
Part Number:
ATmega168PA-AU
Manufacturer:
MICROCHIP
Quantity:
5 502
Company:
Part Number:
ATmega168PA-AU
Manufacturer:
ATMEL
Quantity:
2 300
Company:
Part Number:
ATmega168PA-AUR
Manufacturer:
ATMEL
Quantity:
32
Company:
Part Number:
ATmega168PA-MMH
Manufacturer:
ATMEL
Quantity:
350
24.5.1
24.5.2
24.6
254
ADC Noise Canceler
ATmega48P/88P/168P
ADC Input Channels
ADC Voltage Reference
When changing channel selections, the user should observe the following guidelines to ensure
that the correct channel is selected:
In Single Conversion mode, always select the channel before starting the conversion. The chan-
nel selection may be changed one ADC clock cycle after writing one to ADSC. However, the
simplest method is to wait for the conversion to complete before changing the channel selection.
In Free Running mode, always select the channel before starting the first conversion. The chan-
nel selection may be changed one ADC clock cycle after writing one to ADSC. However, the
simplest method is to wait for the first conversion to complete, and then change the channel
selection. Since the next conversion has already started automatically, the next result will reflect
the previous channel selection. Subsequent conversions will reflect the new channel selection.
The reference voltage for the ADC (V
ended channels that exceed V
either AV
AV
ated from the internal bandgap reference (V
external AREF pin is directly connected to the ADC, and the reference voltage can be made
more immune to noise by connecting a capacitor between the AREF pin and ground. V
also be measured at the AREF pin with a high impedance voltmeter. Note that V
impedance source, and only a capacitive load should be connected in a system.
If the user has a fixed voltage source connected to the AREF pin, the user may not use the other
reference voltage options in the application, as they will be shorted to the external voltage. If no
external voltage is applied to the AREF pin, the user may switch between AV
erence selection. The first ADC conversion result after switching reference voltage source may
be inaccurate, and the user is advised to discard this result.
The ADC features a noise canceler that enables conversion during sleep mode to reduce noise
induced from the CPU core and other I/O peripherals. The noise canceler can be used with ADC
Noise Reduction and Idle mode. To make use of this feature, the following procedure should be
used:
Note that the ADC will not be automatically turned off when entering other sleep modes than Idle
mode and ADC Noise Reduction mode. The user is advised to write zero to ADEN before enter-
ing such sleep modes to avoid excessive power consumption.
CC
a. Make sure that the ADC is enabled and is not busy converting. Single Conversion
b. Enter ADC Noise Reduction mode (or Idle mode). The ADC will start a conversion
c. If no other interrupts occur before the ADC conversion completes, the ADC interrupt
is connected to the ADC through a passive switch. The internal 1.1V reference is gener-
mode must be selected and the ADC conversion complete interrupt must be enabled.
once the CPU has been halted.
will wake up the CPU and execute the ADC Conversion Complete interrupt routine. If
another interrupt wakes up the CPU before the ADC conversion is complete, that
interrupt will be executed, and an ADC Conversion Complete interrupt request will be
generated when the ADC conversion completes. The CPU will remain in active mode
until a new sleep command is executed.
CC
, internal 1.1V reference, or external AREF pin.
REF
will result in codes close to 0x3FF. V
REF
) indicates the conversion range for the ADC. Single
BG
) through an internal amplifier. In either case, the
REF
can be selected as
CC
and 1.1V as ref-
8025M–AVR–6/11
REF
is a high
REF
can

Related parts for ATmega168P