38.3 VREF Characteristics Figure 38-31. ATtiny1614/1616/1617: Internal 0.55V Reference vs. Temperature Figure 38-32. ATtiny1614/1616/1617: Internal 1.1V Reference vs. Temperature Figure 38-33. ATtiny1614/1616/1617: Internal 2.5V Reference vs. Temperature Figure 38-34. ATtiny1614/1616/1617: Internal 4.34V Reference vs. Temperature