AT90PWM81-16SN Atmel, AT90PWM81-16SN Datasheet - Page 192

• Manufacturer Part Number: AT90PWM81-16SN
• Description: IC MCU AVR 8K FLASH ISP 20SOIC
• Manufacturer: Atmel
• Series: AVR® 90PWM Lightingr

Specifications of AT90PWM81-16SN

• Core Processor: AVR
• Core Size: 8-Bit
• Speed: 16MHz
• Connectivity: SPI
• Peripherals: Brown-out Detect/Reset, PWM, WDT
• Number Of I /o: 16
• Program Memory Size: 8KB (8K x 8)
• Program Memory Type: FLASH
• Eeprom Size: 512 x 8
• Ram Size: 256 x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 5.5 V
• Data Converters: A/D 8x10b; D/A 1x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 105°C
• Package / Case: 20-SOIC (7.5mm Width)
• Data Bus Width: 8 bit
• Data Ram Size: 256 B
• Interface Type: SPI
• Maximum Clock Frequency: 16 MHz
• Number Of Timers: 1
• Maximum Operating Temperature: + 105 C
• Mounting Style: SMD/SMT
• Minimum Operating Temperature: - 40 C
• On-chip Adc: 10 bit, 8 Channel
• On-chip Dac: 10 bit, 1 Channel
• Height: 2.35 mm
• Length: 13 mm
• Supply Voltage (max): 5.5 V
• Supply Voltage (min): 2.7 V
• Width: 7.6 mm
• For Use With: ATSTK600-SOIC - STK600 SOCKET/ADAPTER FOR SOIC
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Figure 15-2.
15.4
Figure 15-3.
192
1.0
1.5
BG Ref erence
0.5
Temperature Measurement
AT90PWM81
-40
VPTAT
Illustration of Vbg as a function of temperature.
Temperature sensor Circuitry
-20
BGCRR is used to move the top of the Vbg curve to the
center of the temperature range of interest
The temperature measurement is based on an on-chip temperature sensor that is coupled to a single ended
ADC12 channel, as shown on
Selecting the ADC12 channel by writing the MUX3..0 bits in ADMUX register to “1100” enables the
temperature sensor (see
ADC voltage reference source is the internal 2.56V voltage reference for temperature sensor measure-
ment. When the temperature sensor is enabled, the ADC converter can be used in single conversion mode
to measure the voltage over the temperature sensor. The amplifier allows to charge the ADC sample
capacitor at full CKadc clock speed. The measured voltage has a linear relationship to temperature as
-0
Enable when
ADEN=1
Current-voltage
Convertor
Temperature range of interest
20
40
See “ADC Multiplexer Register – ADMUX” on page
Enable when
ADC Mux=1100
Temperature (°C)
Figure
60
+
-
15-3.
80
ADC Mux=1100
100
Vtemp
216.). The recommended
7734P–AVR–08/10