AT90PWM81-16SN Atmel, AT90PWM81-16SN Datasheet - Page 190

• 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 15-1.
190
BG Calibr ation
Reg isters
BGCC R, BGCRR
BG Calibr ation
Fus es
Aref
AVc c
VPTAT
BG Ref erence
AT90PWM81
Reference Circuitry
AT90PWM81 has an On-chip temperature sensor for monitoring the die temperature. A voltage Propor-
tional-To-Absolute-Temperature, VPTAT, is generated in the voltage reference circuit and after
buffering, is connected to the ADC multiplexer. This temperature sensor can be used for runtime compen-
sation of temperature drift in both the voltage reference and the On-chip Oscillator. To get the absolute
temperature in degrees Kelvin, the measured Vtemp voltage must be scaled with the Vtemp factory cali-
bration value stored in the signature row. See Section “Temperature Measurement”, page 192 for details.
Vbg and Vtemp can be measured with the integrated ADC by selecting the proper ADC channel with
ADMUX (see
SW0
Vbg
SW1
SW2
See “ADC Multiplexer Register – ADMUX” on page
ADC
Comp
SW3
REFS0,REFS1
are used to
control
SW0..3
Voltage Ref e rence
/1.60
/2.13
/3.20
/6.40
Vref
216.).
7734P–AVR–08/10