ATtiny26 Atmel Corporation, ATtiny26 Datasheet - Page 100

• Manufacturer Part Number: ATtiny26
• Manufacturer: Atmel Corporation

Specifications of ATtiny26

• Flash (kbytes): 2 Kbytes
• Pin Count: 20
• Max. Operating Frequency: 16 MHz
• Cpu: 8-bit AVR
• Hardware Qtouch Acquisition: No
• Max I/o Pins: 16
• Ext Interrupts: 11
• Usb Speed: No
• Usb Interface: No
• Spi: 1
• Twi (i2c): 1
• Graphic Lcd: No
• Video Decoder: No
• Camera Interface: No
• Adc Channels: 11
• Adc Resolution (bits): 10
• Adc Speed (ksps): 15
• Analog Comparators: 1
• Resistive Touch Screen: No
• Temp. Sensor: No
• Crypto Engine: No
• Sram (kbytes): 0.12
• Eeprom (bytes): 128
• Self Program Memory: NO
• Dram Memory: No
• Nand Interface: No
• Picopower: No
• Temp. Range (deg C): -40 to 85
• 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: 3
• Pwm Channels: 4
• 32khz Rtc: No
• Calibrated Rc Oscillator: Yes

100
ATtiny26(L)
Figure 56. Differential Measurement Range
Table 44. Correlation Between Input Voltage and Output Codes
Example:
ADMUX = 0xEB (ADC0 - ADC1, 20x gain, 2.56V reference, left adjusted result)
Voltage on ADC0 is 400 mV, voltage on ADC1 is 300 mV.
ADCR = 1024 * 20 * (400 - 300) / 2560 = 800 = 0x320
ADCL will thus read 0x00, and ADCH will read 0xC8. Writing zero to ADLAR right adjusts the
result: ADCL = 0x20, ADCH = 0x03.
V
V
V
...
V
V
V
ADCn
ADCm
ADCm
ADCm
ADCm
ADCm
+ (1023/1024) V
+ (1022/1024) V
+ (1/1024) V
+ V
REF
/GAIN
REF
Output Code
/GAIN
REF
REF
0x3FF
0x000
/GAIN
/GAIN
0
Read code
0x3FF
0x3FF
0x3FE
0x001
0x000
...
Corresponding decimal value
1023
1023
1022
...
1
0
V
REF
/GAIN Differential Input
Voltage (Volts)
1477K–AVR–08/10