ATMEGA8535-16PJ Atmel, ATMEGA8535-16PJ Datasheet - Page 207
ATMEGA8535-16PJ
Manufacturer Part Number
ATMEGA8535-16PJ
Description
IC MCU AVR 8K 5V 16MHZ 40-DIP
Manufacturer
Atmel
Series
AVR® ATmegar
Specifications of ATMEGA8535-16PJ
Core Processor
AVR
Core Size
8-Bit
Speed
16MHz
Connectivity
I²C, SPI, UART/USART
Peripherals
Brown-out Detect/Reset, POR, PWM, WDT
Number Of I /o
32
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)
4.5 V ~ 5.5 V
Data Converters
A/D 8x10b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
40-DIP (0.600", 15.24mm)
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
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Operation
2502K–AVR–10/06
Figure 98. Analog-to-Digital Converter Block Schematic
The ADC converts an analog input voltage to a 10-bit digital value through successive
approximation. The minimum value represents GND and the maximum value represents
the voltage on the AREF pin minus 1 LSB. Optionally, AVCC or an internal 2.56V refer-
ence voltage may be connected to the AREF pin by writing to the REFSn bits in the
ADMUX Register. The internal voltage reference may thus be decoupled by an external
capacitor at the AREF pin to improve noise immunity.
The analog input channel and differential gain are selected by writing to the MUX bits in
ADMUX. Any of the ADC input pins, as well as GND and a fixed bandgap voltage refer-
ence, can be selected as single ended inputs to the ADC. A selection of ADC input pins
can be selected as positive and negative inputs to the differential gain amplifier.
If differential channels are selected, the differential gain stage amplifies the voltage dif-
ference between the selected input channel pair by the selected gain factor. This
amplified value then becomes the analog input to the ADC. If single ended channels are
used, the gain amplifier is bypassed altogether.
AREF
ADC7
ADC6
ADC5
ADC4
ADC3
ADC2
ADC1
ADC0
AVCC
GND
INTERNAL 2.56V
REFERENCE
REFERENCE
8-BIT DATA BUS
BANDGAP
INPUT
INPUT
POS.
MUX
NEG.
MUX
ADC MULTIPLEXER
SELECT (ADMUX)
MUX DECODER
+
-
SINGLE ENDED / DIFFERENTIAL SELECTION
GAIN
AMPLIFIER
10-BIT DAC
ADC CTRL. & STATUS
REGISTER (ADCSRA)
ADC CONVERSION
COMPLETE IRQ
PRESCALER
CONVERSION LOGIC
ATmega8535(L)
ADTS[2:0]
INTERRUPT
TRIGGER
SELECT
FLAGS
SAMPLE & HOLD
COMPARATOR
15
+
-
ADC DATA REGISTER
(ADCH/ADCL)
ADC MULTIPLEXER
OUTPUT
0
207
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