ATmega32M1 Automotive Atmel Corporation, ATmega32M1 Automotive Datasheet - Page 244
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ATmega32M1 Automotive
Manufacturer Part Number
ATmega32M1 Automotive
Description
Manufacturer
Atmel Corporation
Datasheets
1.AT90CAN128_AUTOMOTIVE.pdf
(225 pages)
2.ATMEGA16M1_AUTOMOTIVE.pdf
(12 pages)
3.ATMEGA16M1_AUTOMOTIVE.pdf
(25 pages)
4.ATMEGA16M1_AUTOMOTIVE.pdf
(367 pages)
Specifications of ATmega32M1 Automotive
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 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
- AT90CAN128_AUTOMOTIVE PDF datasheet
- ATMEGA16M1_AUTOMOTIVE PDF datasheet #2
- ATMEGA16M1_AUTOMOTIVE PDF datasheet #3
- ATMEGA16M1_AUTOMOTIVE PDF datasheet #4
- Current page: 244 of 367
- Download datasheet (7Mb)
18.8.1
18.8.2
244
Atmel ATmega16/32/64/M1/C1
User Calibration
Manufacturing Calibration
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:
T = { [ (ADCH << 8) | ADCL ] - T
where ADCH & ADCL are the ADC data registers, k is a fixed coefficient and T
perature sensor offset value determined and stored into EEPROM.
One can also use the calibration values available in the signature row
nature Row from Software” on page 289.
The calibration values are determined from values measured during test at room temperature
which is approximatively +25°C and during test at hot temperature which is approximatively
+125°C. Calibration measures are done at V
mode.
There are two algorithms for determining the Centigrade Temperature
formula 1 for ATmega32 up to rev B
formula 2 for ATmega16/64 and ATmega32 rev C.
formula 1: Temp_C = (((ADC_ts - 273)* TS_Gain) / 128) + TS_Offset [Applicable to devices
with 0xFF or 0x42 ('B') in the signature memory at address 0x003F]
formula 2: Temp_C = ((((ADC_ts -(298 - TS_Offset)) * TS_Gain) / 128) + 25 [Applicable to
devices with 0x43 ('C') in the signature memory at address 0x003F]
Where :
Temp_C is the result temperature in degrees centigrade.
ADC_ts is the 10 bit result the ADC returns from reading the temperature sensor.
TS_Gain is the unsigned fixed point 8-bit temperature sensor gain factor in 1/128th units
stored as previously in the signature row at address 0x0007.
TS_Offset is the signed twos complement 7-bit temperature sensor offset reading stored as
previously in the signature row at address 0x0005.
A new parameter has also been stored into the signature row at address (0x003A[Low Byte] -
0x003B [High Byte]) which is the 10-bit ADC reading of the temperature sensor during Hot
testing (+155C in Grade0 or +130C in Grade1).
See section 27.7.10 in the ATmega32M1 Automotive datasheet for details of reading the Sig-
nature Row.
OS
} / k
CC
= 3V and with ADC in internal Vref (2.56V)
See “Reading the Sig-
7647G–AVR–09/11
OS
is the tem-
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