ATTINY24A-MUR Atmel, ATTINY24A-MUR Datasheet - Page 142
ATTINY24A-MUR
Manufacturer Part Number
ATTINY24A-MUR
Description
MCU AVR 2KB FLASH 20MHZ 20QFN
Manufacturer
Atmel
Series
AVR® ATtinyr
Specifications of ATTINY24A-MUR
Core Processor
AVR
Core Size
8-Bit
Speed
20MHz
Connectivity
USI
Peripherals
Brown-out Detect/Reset, POR, PWM, Temp Sensor, WDT
Number Of I /o
12
Program Memory Size
2KB (1K x 16)
Program Memory Type
FLASH
Eeprom Size
128 x 8
Ram Size
128 x 8
Voltage - Supply (vcc/vdd)
1.8 V ~ 5.5 V
Data Converters
A/D 8x10b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
*
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
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16.11 ADC Conversion Result
16.11.1
16.11.2
142
ATtiny24A/44A/84A
Single Ended Conversion
Unipolar Differential Conversion
Figure 16-12. Differential Non-linearity (DNL)
After the conversion is complete (ADIF is high), the conversion result can be found in the ADC
Data Registers (ADCL, ADCH). The form of the conversion result depends on the type of the
conversio as there are three types of conversions: single ended conversion, unipolar differential
conversion and bipolar differential conversion.
For single ended conversion, the result is
where V
Table 16-3 on page 144
0x3FF represents the selected reference voltage 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
than the voltage of the negative pin or otherwise the voltage difference is saturated to zero. The
result is presented in one-sided form, from 0x000 (0d) through 0x3FF (+1023d). The GAIN is
either 1x or 20x.
• Quantization Error: Due to the quantization of the input voltage into a finite number of codes,
• Absolute Accuracy: The maximum deviation of an actual (unadjusted) transition compared to
a range of input voltages (1 LSB wide) will code to the same value. Always ± 0.5 LSB.
an ideal transition for any code. This is the compound effect of offset, gain error, differential
error, non-linearity, and quantization error. Ideal value: ± 0.5 LSB.
REF
IN
POS
the selected voltage reference. The voltage of the positive pin must always be larger
is the voltage on the selected input pin and V
is the voltage on the positive input pin, V
and
Output Code
ADC
Table 16-4 on page
0x000
0x3FF
=
0
(
------------------------------------------------------- - GAIN
ADC
V
1 LSB
POS
–
=
V
V
V
--------------------------
REF
NEG
IN
V
⋅
REF
) 1024
1024
145). 0x000 represents analog ground, and
⋅
NEG
REF
V
the voltage on the negative input pin,
REF
⋅
the selected voltage reference (see
Input Voltage
8183C–AVR–03/11
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