Datasheet

135
ATtiny25/45/85 [DATASHEET]
2586Q–AVR–08/2013
enables the temperature sensor. Refer to Table 17-4 for details. If these bits are changed during a conversion, the
change will not go into effect until this conversion is complete (ADIF in ADCSRA is set).
Note: 1. For offset calibration, only. See “Operation” on page 123.
2. After switching to internal voltage reference the ADC requires a settling time of 1ms before measurements are sta-
ble. Conversions starting before this may not be reliable. The ADC must be enabled during the settling time.
3. For temperature sensor.
Table 17-4. Input Channel Selections
MUX[3:0]
Single Ended
Input
Positive
Differential Input
Negative
Differential Input Gain
0000 ADC0 (PB5)
N/A
0001 ADC1 (PB2)
0010 ADC2 (PB4)
0011 ADC3 (PB3)
0100
N/A
ADC2 (PB4) ADC2 (PB4) 1x
0101
(1)
ADC2 (PB4) ADC2 (PB4) 20x
0110 ADC2 (PB4) ADC3 (PB3) 1x
0111 ADC2 (PB4) ADC3 (PB3) 20x
1000 ADC0 (PB5) ADC0 (PB5) 1x
1001 ADC0 (PB5) ADC0 (PB5) 20x
1010 ADC0 (PB5) ADC1 (PB2) 1x
1011 ADC0 (PB5) ADC1 (PB2) 20x
1100
(2)
V
BG
N/A
1101 GND
1110 N/A
1111
(3)
ADC4