ATtiny25 Automotive Atmel Corporation, ATtiny25 Automotive Datasheet - Page 124

• Manufacturer Part Number: ATtiny25 Automotive
• Manufacturer: Atmel Corporation

Specifications of ATtiny25 Automotive

• Flash (kbytes): 2 Kbytes
• Pin Count: 8
• Max. Operating Frequency: 16 MHz
• Cpu: 8-bit AVR
• # Of Touch Channels: 4
• Hardware Qtouch Acquisition: No
• Max I/o Pins: 6
• Ext Interrupts: 6
• Usb Speed: No
• Usb Interface: No
• Spi: 1
• Twi (i2c): 1
• Graphic Lcd: No
• Video Decoder: No
• Camera Interface: No
• Adc Channels: 4
• Adc Resolution (bits): 10
• Adc Speed (ksps): 15
• Analog Comparators: 1
• Resistive Touch Screen: No
• Temp. Sensor: Yes
• Crypto Engine: No
• Sram (kbytes): 0.12
• Eeprom (bytes): 128
• Self Program Memory: YES
• Dram Memory: No
• Nand Interface: No
• Picopower: No
• Temp. Range (deg C): -40 to 125
• I/o Supply Class: 2.7 to 5.5
• Operating Voltage (vcc): 2.7 to 5.5
• Fpu: No
• Mpu / Mmu: no / no
• Timers: 2
• Output Compare Channels: 5
• Pwm Channels: 6
• 32khz Rtc: No
• Calibrated Rc Oscillator: Yes

18.7.6
124
ATtiny25/45/85
ADC Control and Status Register A – ADCSRA
• Bits 3:0 – MUX3:0: Analog Channel and Gain Selection Bits
The value of these bits selects which combination of analog inputs are connected to the ADC. In
case of differential input (ADC0 - ADC1 or ADC2 - ADC3), gain selection is also made with these
bits. Selecting ADC2 or ADC0 as both inputs to the differential gain stage enables offset mea-
surements. Selecting the single-ended channel ADC4 enables the temperature sensor. Refer to
Table 18-4
effect until this conversion is complete (ADIF in ADCSRA is set).
Table 18-4.
1.
2.
• Bit 7 – ADEN: ADC Enable
Writing this bit to one enables the ADC. By writing it to zero, the ADC is turned off. Turning the
ADC off while a conversion is in progress, will terminate this conversion.
• Bit 6 – ADSC: ADC Start Conversion
In Single Conversion mode, write this bit to one to start each conversion. In Free Running mode,
write this bit to one to start the first conversion.
Bit
Read/Write
Initial Value
MUX3..0
0101
0000
0001
0010
0011
0100
0110
0111
1000
1001
1010
1011
1100
1101
1110
1111
For offset calibration only .
For Temperature Sensor
(1)
for details. If these bits are changed during a conversion, the change will not go into
ADEN
R/W
Input Channel Selections
7
0
ADSC
Single Ended
R/W
ADC0 (PB5)
ADC1 (PB2)
ADC2 (PB4)
ADC3 (PB3)
6
0
1.1V/2.56V
ADC4
Input
N/A
N/A
0V
ADATE
R/W
(2)
5
0
See “Operation” on page 112.
ADIF
R/W
4
0
Differential Input
ADC2 (PB3)
ADC2 (PB3)
ADC2 (PB3)
ADC2 (PB3)
ADC0 (PB5)
ADC0 (PB5)
ADC0 (PB5)
ADC0 (PB5)
Positive
ADIE
R/W
3
0
ADPS2
R/W
2
0
Differential Input
ADC2 (PB3)
ADC2 (PB3)
ADC3 (PB4)
ADC3 (PB4)
ADC0 (PB5)
ADC0 (PB5)
ADC1 (PB2)
ADC1 (PB2)
ADPS1
R/W
Negative
1
0
N/A
N/A
ADPS0
R/W
0
0
ADCSRA
7598H–AVR–07/09
Gain
20x
20x
20x
20x
1x
1x
1x
1x