ATmega16M1 Automotive Atmel Corporation, ATmega16M1 Automotive Datasheet - Page 243

• Manufacturer Part Number: ATmega16M1 Automotive
• Manufacturer: Atmel Corporation

Specifications of ATmega16M1 Automotive

• Flash (kbytes): 16 Kbytes
• Pin Count: 32
• Max. Operating Frequency: 16 MHz
• Cpu: 8-bit AVR
• # Of Touch Channels: 12
• Hardware Qtouch Acquisition: No
• Max I/o Pins: 27
• Ext Interrupts: 27
• Usb Speed: No
• Usb Interface: No
• Spi: 1
• Uart: 1
• Can: 1
• Lin: 1
• Graphic Lcd: No
• Video Decoder: No
• Camera Interface: No
• Adc Channels: 11
• Adc Resolution (bits): 10
• Adc Speed (ksps): 125
• Analog Comparators: 4
• Resistive Touch Screen: No
• Dac Channels: 1
• Dac Resolution (bits): 10
• Temp. Sensor: Yes
• 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 150
• I/o Supply Class: 2.7 to 5.5
• Operating Voltage (vcc): 2.7 to 5.5
• Fpu: No
• Mpu / Mmu: no / no
• Timers: 2
• Output Compare Channels: 14
• Input Capture Channels: 1
• Pwm Channels: 10
• 32khz Rtc: No
• Calibrated Rc Oscillator: Yes

18.8
7647G–AVR–09/11
Temperature Measurement
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 2.56V 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 converter can be used in single conversion mode to measure the voltage over the tem-
perature sensor.
As shown
when ADMUX value selects the temperature sensor as ADC input
Selection” on page 246.
two successive conversions are required. The correct temperature measurement will be the
second one.
One can also reduce this timing to one conversion by setting the ADMUX during the previous
conversion. Indeed the ADMUX can be programmed to select the temperature sensor just
after the beginning of the previous conversion start event and then the driver will be enabled 2
µS before sampling and hold phase of temperature sensor measurement. See “Changing
Channel or Reference Selection” on page 235.
Figure 18-14. Temperature Sensor Block Diagram
The measured voltage has a linear relationship to the temperature as described in
on page
perature measurement is +/- 10°C after bandgap calibration.
Table 18-3.
The values described in
cess variation the temperature sensor output voltage varies from one chip to another. To be
capable of achieving more accurate results, the temperature measurement can be calibrated
in the application software.
Temperature / °C
Voltage / mV
243. The voltage sensitivity is approximately 2.5 mV/
Figure
Temperature vs. Sensor Output Voltage (Typical Case)
Temperature
Sensor
18-14, the temperature sensor is followed by a driver. This driver is enabled
The propagation delay of this driver is approximatively 2µS. Therefore
Table 18-3 on page 243
600 mV
ADMUX = Temp. Sensor input
-40°C
Atmel ATmega16/32/64/M1/C1
G=1
Enable when
are typical values. However, due to the pro-
ADC
Input
Multiplexer
ADMUX
762 mv
+25°C
to sampling
and hold
°
C and the accuracy of the tem-
See “ADC Input Channel
1012 mV
+125°C
Table 18-3
243