ATMEGA32M1-AU Atmel, ATMEGA32M1-AU Datasheet - Page 237
![MPU AVR 32K FLASH 20MHZ 32TQFP](/photos/6/91/69154/313-32-tqfp_sml.jpg)
ATMEGA32M1-AU
Manufacturer Part Number
ATMEGA32M1-AU
Description
MPU AVR 32K FLASH 20MHZ 32TQFP
Manufacturer
Atmel
Series
AVR® ATmegar
Specifications of ATMEGA32M1-AU
Core Processor
AVR
Core Size
8-Bit
Speed
16MHz
Connectivity
CAN, LIN, SPI, UART/USART
Peripherals
Brown-out Detect/Reset, POR, PWM, Temp Sensor, WDT
Program Memory Size
32KB (16K x 16)
Program Memory Type
FLASH
Eeprom Size
1K x 8
Ram Size
2K x 8
Voltage - Supply (vcc/vdd)
2.7 V ~ 5.5 V
Data Converters
A/D 11x10b; D/A 1x10b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
32-TQFP
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Number Of I /o
-
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Part Number:
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Manufacturer:
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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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