ATTINY25-20SSUR Atmel, ATTINY25-20SSUR Datasheet - Page 138
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ATTINY25-20SSUR
Manufacturer Part Number
ATTINY25-20SSUR
Description
MCU AVR 2KB FLASH 20MHZ 8SOIC
Manufacturer
Atmel
Series
AVR® ATtinyr
Specifications of ATTINY25-20SSUR
Core Processor
AVR
Core Size
8-Bit
Speed
20MHz
Connectivity
USI
Peripherals
Brown-out Detect/Reset, POR, PWM, WDT
Number Of I /o
6
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)
2.7 V ~ 5.5 V
Data Converters
A/D 4x10b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
*
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
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17.13 Register Description
17.13.1
138
ATtiny25/45/85
ADMUX – ADC Multiplexer Selection Register
assuming calibration at room temperature. Better accuracies are achieved by using two
temperature points for calibration.
Table 17-2.
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, 4 – REFS[2:0]: Voltage Reference Selection Bits
These bits select the voltage reference (V
are changed during a conversion, the change will not go in effect until this conversion is
complete (ADIF in ADCSR is set). Whenever these bits are changed, the next conversion will
take 25 ADC clock cycles. When differential channels and gain are used, using V
external AREF higher than (V
affect the ADC accuracy.
Table 17-3.
Note:
Bit
0x07
Read/Write
Initial Value
Temperature
ADC
REFS2
T = k * [(ADCH << 8) | ADCL] + T
X
X
0
0
1
1
1. The device requries a supply voltage of 3V in order to generate 2.56V reference voltage.
REFS1
Temperature vs. Sensor Output Voltage (Typical Case)
Voltage Reference Selections for ADC
REFS1
0
0
1
1
1
1
R/W
7
0
REFS0
REFS0
Table 17-2
R/W
6
0
0
1
0
1
0
1
CC
230 LSB
-40
ADLAR
- 1V) as a voltage reference is not recommended as this will
R/W
V
External Voltage Reference at PB0 (AREF) pin, Internal Voltage
Reference turned off.
Internal 1.1V Voltage Reference.
Reserved
Internal 2.56V Voltage Reference without external bypass
capacitor, disconnected from PB0 (AREF)
Internal 2.56V Voltage Reference with external bypass capacitor at
PB0 (AREF) pin
Voltage Reference (V
5
0
°
CC
C
are typical values. However, due to process variation the
used as Voltage Reference, disconnected from PB0 (AREF).
REF
REFS2
OS
R/W
4
0
) for the ADC, as shown in
(1)
.
MUX3
R/W
3
0
REF
300 LSB
+25
) Selection
MUX2
°
R/W
C
2
0
MUX1
R/W
1
0
Table
(1)
.
17-3. If these bits
MUX0
R/W
0
0
370 LSB
2586M–AVR–07/10
+85
°
C
CC
ADMUX
or an
OS
is
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