ATtiny167 Atmel Corporation, ATtiny167 Datasheet - Page 202

• Manufacturer Part Number: ATtiny167
• Manufacturer: Atmel Corporation

Specifications of ATtiny167

• Flash (kbytes): 16 Kbytes
• Pin Count: 20
• Max. Operating Frequency: 16 MHz
• Cpu: 8-bit AVR
• # Of Touch Channels: 8
• Hardware Qtouch Acquisition: No
• Max I/o Pins: 16
• Ext Interrupts: 16
• Usb Speed: No
• Usb Interface: No
• Spi: 2
• Twi (i2c): 1
• Uart: 1
• Lin: 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: Yes
• Crypto Engine: No
• Sram (kbytes): 0.5
• Eeprom (bytes): 512
• Self Program Memory: YES
• Dram Memory: No
• Nand Interface: No
• Picopower: No
• Temp. Range (deg C): -40 to 85
• I/o Supply Class: 1.8 to 5.5
• Operating Voltage (vcc): 1.8 to 5.5
• Fpu: No
• Mpu / Mmu: no / no
• Timers: 2
• Output Compare Channels: 3
• Input Capture Channels: 1
• Pwm Channels: 9
• 32khz Rtc: Yes
• Calibrated Rc Oscillator: Yes

17.8
17.8.1
17.8.2
17.8.3
202
ADC Conversion Result
ATtiny87/ATtiny167
Single Ended Conversion
Unipolar Differential Conversion
Bipolar Differential Conversion
After the conversion is complete (ADIF is high), the conversion result can be found in the ADC
Result Registers (ADCL, ADCH). The form of the conversion result depends on the type of the
conversion as there are three types of conversions: single ended conversion, unipolar differ-
ential conversion and bipolar differential conversion.
For single ended conversion, the result is:
where V
Table 17-4 on page 205
0x3FF represents the selected voltage reference minus one LSB. The result is presented in
one-sided form, from 0x3FF to 0x000.
If differential channels and an unipolar input mode are used, the result is:
where V
and V
206). The voltage on the positive pin must always be larger than the voltage on the negative
pin or otherwise the voltage difference is saturated to zero. The result is presented in
one-sided form, from 0x000 (0
As default the ADC converter operates in the unipolar input mode, but the bipolar input mode
can be selected by writing the BIN bit in the ADCSRB register to one. In the bipolar input mode
two-sided voltage differences are allowed and thus the voltage on the negative input pin can
also be larger than the voltage on the positive input pin. If differential channels and a bipolar
input mode are used, the result is:
where V
and V
from 0x200 (-512
REF
REF
IN
POS
POS
the selected voltage reference (see
the selected voltage reference. The result is presented in two’s complement form,
is the voltage on the selected input pin and V
is the voltage on the positive input pin, V
is the voltage on the positive input pin, V
d
) through 0x000 (+0
and
ADC
ADC
Table 17-5 on page
d
) to 0x3FF (+1023
=
=
(
------------------------------------------------------- - GAIN
(
---------------------------------------------------- - GAIN
ADC
V
V
POS
d
POS
) to 0x1FF (+511
–
=
–
V
V
V
V
V
--------------------------
REF
REF
NEG
Table 17-4 on page 205
NEG
IN
V
⋅
REF
d
) 1024
1024
206). 0x000 represents analog ground, and
) 512
). The GAIN is either 8x or 20x.
⋅
⋅
NEG
NEG
REF
d
). The GAIN is either 8x or 20x.
the voltage on the negative input pin,
the voltage on the negative input pin,
⋅
⋅
the selected voltage reference (see
and
Table 17-5 on page
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