ATTINY25V-15ST Atmel, ATTINY25V-15ST Datasheet - Page 119
ATTINY25V-15ST
Manufacturer Part Number
ATTINY25V-15ST
Description
MCU AVR 2K FLASH 4MHZ 8-SOIC
Manufacturer
Atmel
Series
AVR® ATtinyr
Datasheet
1.ATTINY25-15MZ.pdf
(196 pages)
Specifications of ATTINY25V-15ST
Package / Case
8-SOIC (3.9mm Width)
Voltage - Supply (vcc/vdd)
1.8 V ~ 3.6 V
Operating Temperature
-40°C ~ 85°C
Speed
8MHz
Number Of I /o
6
Eeprom Size
128 x 8
Core Processor
AVR
Program Memory Type
FLASH
Ram Size
128 x 8
Program Memory Size
2KB (2K x 8)
Data Converters
A/D 4x10b
Oscillator Type
Internal
Peripherals
Brown-out Detect/Reset, POR, PWM, WDT
Connectivity
USI
Core Size
8-Bit
Processor Series
ATTINY2x
Core
AVR8
Data Bus Width
8 bit
Data Ram Size
128 B
Maximum Operating Temperature
+ 85 C
Mounting Style
SMD/SMT
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Part Number:
ATTINY25V-15ST
Manufacturer:
ATMEL/爱特梅尔
Quantity:
20 000
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18.6.2
18.6.3
7598H–AVR–07/09
Analog Noise Canceling Techniques
ADC Accuracy Definitions
Figure 18-8. Analog Input Circuitry
Digital circuitry inside and outside the device generates EMI which might affect the accuracy of
analog measurements. If conversion accuracy is critical, the noise level can be reduced by
applying the following techniques:
An n-bit single-ended ADC converts a voltage linearly between GND and V
(LSBs). The lowest code is read as 0, and the highest code is read as 2
Several parameters describe the deviation from the ideal behavior:
Figure 18-9. Offset Error
• Offset: The deviation of the first transition (0x000 to 0x001) compared to the ideal transition
(at 0.5 LSB). Ideal value: 0 LSB.
a. Keep analog signal paths as short as possible. Make sure analog tracks run over
b. Use the ADC noise canceler function to reduce induced noise from the CPU.
c. If any port pins are used as digital outputs, it is essential that these do not switch
the analog ground plane, and keep them well away from high-speed switching digi-
tal tracks.
while a conversion is in progress.
ADCn
Output Code
Offset
Error
I
IH
I
IL
1..100 kohm
V
REF
Input Voltage
C
ATtiny25/45/85
S/H
= 14 pF
Ideal ADC
Actual ADC
n
-1.
V
CC
REF
/2
in 2
n
steps
119
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