ATmega32M1 Atmel Corporation, ATmega32M1 Datasheet - Page 237
ATmega32M1
Manufacturer Part Number
ATmega32M1
Description
Manufacturer
Atmel Corporation
Specifications of ATmega32M1
Flash (kbytes)
32 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)
2
Eeprom (bytes)
1024
Self Program Memory
YES
Dram Memory
No
Nand Interface
No
Picopower
No
Temp. Range (deg C)
-40 to 85
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
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21.8.1
21.8.2
21.9
8209D–AVR–11/10
Amplifier
User Calibration
Manufacturing Calibration
The measured voltage has a linear relationship to the temperature as described in
The voltage sensitivity is approximately 1mV/
Table 21-3.
The values described in
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.
The software calibration requires that a calibration value is measured and stored in a register or
EEPROM for each chip. The software calibration can be done utilizing the formula:
where ADCH & ADCL are the ADC data registers, k is a fixed coefficient and T
ature sensor offset value determined and stored into EEPROM.
One can also use the calibration values available in the signature row
ture Row from Software” on page 279.
The calibration values are determined from values measured during test at hot temperature
which is approximatively +85°C.
The temperature in Celsius degrees can be calculated utilizing the formula:
Where:
The ATmega16M1/32M1/64M1 features three differential amplified channels with programmable
5, 10, 20, and 40 gain stage.
Because the amplifiers are switching capacitor amplifiers, they need to be clocked by a synchro-
nization signal called in this document the amplifier synchronization clock. To ensure an
accurate result, the amplifier input needs to have a quite stable input value during at least 4
Amplifier synchronization clock periods.
To ensure an accurate result, the amplifier input needs to have a quite stable input value at the
sampling point during at least 4 amplifier synchronization clock periods.
Amplified conversions can be synchronized to PSC events (see
Description in One Ramp Mode” on page 148
Temperature/°C
a. ADCH & ADCL are the ADC data registers
b. TSGAIN is the temperature sensor gain (constant 1, or unsigned fixed point num-
c. TSOFFSET is the temperature sensor offset correction term (2. complement
Voltage/mV
ber, 0x80 = decimal 1.0)
signed byte)
Temperature vs. Sensor Output Voltage (Typical Case)
T = {[(ADCH << 8) | ADCL] × TSGAIN} + TSOFFSET - 273
Table 21-3
T = {[(ADCH << 8) | ADCL] - T
600mV
-40°C
are typical values. However, due to the process variation the
°
C.
and
ATmega16M1/32M1/64M1
“Synchronization Source Description in Cen-
762mv
+25°C
OS
}/k
“Synchronization Source
See “Reading the Signa-
OS
TBD mV
+85°C
is the temper-
Table
21-3.
237
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