ATTINY861V-10SUR Atmel, ATTINY861V-10SUR Datasheet - Page 155
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ATTINY861V-10SUR
Manufacturer Part Number
ATTINY861V-10SUR
Description
IC MCU AVR 8K FLASH 10MHZ 20SOIC
Manufacturer
Atmel
Series
AVR® ATtinyr
Specifications of ATTINY861V-10SUR
Core Processor
AVR
Core Size
8-Bit
Speed
10MHz
Connectivity
USI
Peripherals
Brown-out Detect/Reset, POR, PWM, WDT
Number Of I /o
16
Program Memory Size
8KB (4K x 16)
Program Memory Type
FLASH
Eeprom Size
512 x 8
Ram Size
512 x 8
Voltage - Supply (vcc/vdd)
1.8 V ~ 5.5 V
Data Converters
A/D 11x10b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
*
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
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15.13 Register Description
15.13.1
2588E–AVR–08/10
ADMUX – ADC Multiplexer Selection Register
assuming calibration at room temperature. Better accuracies are achieved by using two
temperature points for calibration.
Table 15-2.
The values described in
temperature sensor output voltage varies from one chip to another. To be capable of achieving
more accurate results the temperature measurement can be calibrated in the application soft-
ware. The sofware calibration can be done using the formula:
where ADCH and ADCL are the ADC data registers, k is the fixed slope coefficient and T
the temperature sensor offset. Typically, k is very close to 1.0 and in single-point calibration the
coefficient may be omitted. Where higher accuracy is required the slope coefficient should be
evaluated based on measurements at two temperatures.
• Bits 7:6 – REFS1:REFS0: Voltage Reference Selection Bits
These bits together with the REFS2 bit from the ADC Control and Status Register B (ADCSRB)
select the voltage reference for the ADC, as shown in
Table 15-3.
If these bits are changed during a conversion, the change will not go in effect until this conver-
sion is complete (ADIF in ADCSR is set). Also note, that when these bits are changed, the next
conversion will take 25 ADC clock cycles.
Bit
0x07 (0x27)
Read/Write
Initial Value
Temperature
ADC
T = k * [(ADCH << 8) | ADCL] + T
REFS2
X
X
0
0
1
1
Temperature vs. Sensor Output Voltage (Typical Case)
Voltage Reference Selections for ADC
REFS1
R/W
7
0
REFS1
0
0
1
1
1
1
REFS0
Table 15-2
R/W
6
0
230 LSB
-40 °C
ADLAR
REFS0
R/W
5
0
0
1
0
1
0
1
are typical values. However, due to process variation the
MUX4
OS
R/W
4
0
Voltage Reference Selection
V
disconnected from AREF
External voltage reference at AREF pin,
internal voltage reference turned off
Internal 1.1V voltage reference
Reserved
Internal 2.56V voltage reference,
without external bypass capacitor,
disconnected from AREF
Internal 2.56V voltage reference,
with external bypass capacitor at AREF pin
CC
used as voltage reference,
MUX3
R/W
3
0
Table
300 LSB
+25 °C
15-3.
MUX2
R/W
2
0
MUX1
R/W
1
0
MUX0
R/W
0
0
370 LSB
+85 °C
ADMUX
OS
155
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