
189
7734Q–AVR–02/12
AT90PWM81/161
15. Voltage Reference and Temperature Sensor
15.1
Features
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
15.2
On Chip voltage Reference and Temperature sensor overview
A low power band-gap reference provides AT90PWM81/161 with an accurate On-chip Bandgap
voltage of 1.100V (Vbg).
Then when SW1 is off and SW2/SW3 is on, the bandgap voltage is multiplied and generates the
internal reference V
REF 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 excel-
The selection of the Voltage Reference for all the analog components (ADC, DAC, Compara-