attiny25v ATMEL Corporation, attiny25v Datasheet - Page 138
attiny25v
Manufacturer Part Number
attiny25v
Description
Microcontroller With 2/4/8k Bytes In-system Programmable Flash
Manufacturer
ATMEL Corporation
Datasheet
1.ATTINY25V.pdf
(231 pages)
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
attiny25v-10MU
Manufacturer:
ATMEL
Quantity:
1 650
Part Number:
attiny25v-10MU
Manufacturer:
ATMEL/爱特梅尔
Quantity:
20 000
Company:
Part Number:
attiny25v-10PU
Manufacturer:
Atmel
Quantity:
29 497
Company:
Part Number:
attiny25v-10PU
Manufacturer:
Atmel
Quantity:
5 000
Company:
Part Number:
attiny25v-10SU
Manufacturer:
ATMEL
Quantity:
2 110
Part Number:
attiny25v-10SU
Manufacturer:
ATMEL/爱特梅尔
Quantity:
20 000
Part Number:
attiny25v-15ST
Manufacturer:
ATMEL/爱特梅尔
Quantity:
20 000
- Current page: 138 of 231
- Download datasheet (5Mb)
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
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.
• Bit 7:6,4 – REFS2:REFS0: 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 °C
ADLAR
- 1V) as a voltage reference is not recommended as this will
R/W
Voltage Reference (V
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
5
0
CC
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 °C
) Selection
MUX2
R/W
2
0
MUX1
R/W
1
0
Table
(1)
.
17-3. If these bits
MUX0
R/W
0
0
370 LSB
+85 °C
2586K–AVR–01/08
CC
OS
ADMUX
or an
is the
Related parts for attiny25v
Image
Part Number
Description
Manufacturer
Datasheet
Request
R
Part Number:
Description:
INTERVAL AND WIPE/WASH WIPER CONTROL IC WITH DELAY
Manufacturer:
ATMEL Corporation
Datasheet:
Part Number:
Description:
Low-Voltage Voice-Switched IC for Hands-Free Operation
Manufacturer:
ATMEL Corporation
Datasheet:
Part Number:
Description:
MONOLITHIC INTEGRATED FEATUREPHONE CIRCUIT
Manufacturer:
ATMEL Corporation
Datasheet:
Part Number:
Description:
AM-FM Receiver IC U4255BM-M
Manufacturer:
ATMEL Corporation
Datasheet:
Part Number:
Description:
Monolithic Integrated Feature Phone Circuit
Manufacturer:
ATMEL Corporation
Datasheet:
Part Number:
Description:
Multistandard Video-IF and Quasi Parallel Sound Processing
Manufacturer:
ATMEL Corporation
Datasheet:
Part Number:
Description:
High-performance EE PLD
Manufacturer:
ATMEL Corporation
Datasheet:
Part Number:
Description:
8-bit Flash Microcontroller
Manufacturer:
ATMEL Corporation
Datasheet:
Part Number:
Description:
2-Wire Serial EEPROM
Manufacturer:
ATMEL Corporation
Datasheet:
Part Number:
Description:
U6046BREAR WINDOW HEATING TIMER / LONG-TERM TIMER
Manufacturer:
ATMEL Corporation
Datasheet: