at90pwm81-16se ATMEL Corporation, at90pwm81-16se Datasheet - Page 189

• Manufacturer Part Number: at90pwm81-16se
• Description: 8-bit Avr Microcontroller With 8k Bytes In- System Programmable Flash
• Manufacturer: ATMEL Corporation

16. Voltage Reference and Temperature Sensor
16.1
16.2
7734M–AVR–03/10
Features
On Chip voltage Reference and Temperature sensor overview
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A low power band-gap reference provides AT90PWM81 with an accurate On-chip Bandgap voltage of
1.100 V (Vbg).
Then when SW1 is off and SW2/SW3 is on, the bandgap voltage is multiplied and generates the internal
reference VREF of 2.56V. This reference voltage is used as reference for the ADC, the DAC and can use
a buffer with external decoupling capacitor (when SW0 is on) to enable excellent noise performance with
minimum power consumption as shown on
The selection of the Voltage Reference for all the analog components (ADC, DAC, Comparators) is done
using the REFS1:0 bits in ADMUX register; see
For conditions using the Bandgap and the internal voltage reference, see
Reference Enable Signals and Start-up Time” on page 54
Accurate Voltage Reference of 2.56V
Internal Temperature Sensor
Possibility for Runtime Compensation of Temperature Drift in Both Voltage Reference and On Chip
Oscillators
Low Power Consumption
Figure
“ADC Multiplexer Register – ADMUX” on page
16-1.
“Bandgap and Internal Voltage
AT90PWM81
216.
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