ATmega328P Automotive Atmel Corporation, ATmega328P Automotive Datasheet - Page 254

• Manufacturer Part Number: ATmega328P Automotive
• Manufacturer: Atmel Corporation

Specifications of ATmega328P Automotive

• Flash (kbytes): 32 Kbytes
• Pin Count: 32
• Max. Operating Frequency: 16 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): 2
• Eeprom (bytes): 1024
• Self Program Memory: YES
• Dram Memory: No
• Nand Interface: No
• Picopower: Yes
• Temp. Range (deg C): -40 to 125
• I/o Supply Class: 2.7 to 5.5
• Operating Voltage (vcc): 2.7 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

23.7
23.8
23.8.1
254
ADC Conversion Result
Temperature Measurement
ATmega328P [Preliminary]
Manufacturing Calibration
After the conversion is complete (ADIF is high), the conversion result can be found in the ADC
Result Registers (ADCL, ADCH).
For single ended conversion, the result is
where V
Table 23-3 on page 256
0x3FF represents the selected reference voltage minus one LSB.
The temperature measurement is based on an on-chip temperature sensor that is coupled to a
single ended ADC input. MUX[4..0] bits in ADMUX register enables the temperature sensor. The
internal 1.1V voltage reference must also be selected for the ADC voltage reference source in
the temperature sensor measurement. When the temperature sensor is enabled, the ADC con-
verter can be used in single conversion mode to measure the voltage over the temperature
sensor.
The measured voltage has a linear relationship to the temperature as described in
page
The voltage sensitivity is approximately 1LSB/
ment is ±
The values described in
variation the temperature sensor output varies from one chip to another.
Table 23-2.
Calibration values determined during test are available in the signature row.
The temperature in degrees Celsius can be calculated using the formula:
Temperature / °C
254.
IN
10°
is the voltage on the selected input pin and V
C using manufacturing calibration values (TS_GAIN, TS_OFFSET).
Sensor output code vs Temperature (typical values)
Table 23-2 on page 254
and
Table 23-4 on page
0x010D
-40°C
ADC
=
V
---------------------------- -
°
IN
C and the accuracy of the temperature measure-
V
are typical values. However, due to the process
REF
257). 0x000 represents analog ground, and
1024
REF
0x0160
+25 °C
the selected voltage reference (see
+125 °C
0x01E0
Table 23-2 on
7810A–AVR–11/09