ATmega8535 Datasheet, Pinout, Minimal Circuit, Maximum Frequency Calculator

The ATmega8535 is a 40-pin device with a full complement of peripherals. With all those peripherals and only 512B of RAM, one needs to be careful about memory use. The device can be put in a compatibility mode which allows it to be used in place of an ATS908535 by changing the watchdog timer and removing the double buffering on the USART receive register.

There are 8 ADC channels, an analog comparator, 3 timers and four PWM channels. The device contains an internal 1MHz, 2MHz, 4MHz or 8MHz RC oscillator, and defaults to the 1MHz clock.

Power Supply vs. Maximum Frequency

The ATmega8535 is specified at a power supply voltage of 2.7V to 5.5V, 16MHz maximum frequency. It is rated 8MHz from 2.7V to 4.0V, and 16MHz above that.

Maximum Frequency Calculator for ATmega8535

ATmega8535 Features
FeatureATmega162
Flash 8k
EEPROM 512B
RAM 512B
I/O Pins 32
Interrupts 21
USARTS 1
USI 0
SPI 1
TWI 1
ADC Channels 8
RT Counter (w/osc)1
Timers (8-bit) 1
Timers (16-bit) 1
PWM (8-bit) 2
PWM (16-bit) 2
Price (1's) $4.25
CharacteristicValue
Power Consumption (approximate) 1.46mA/MHz@5V
Maximum I/O Current (per pin) 40mA
Maximum I/O Current (all ports) 100mA(low)/150mA(high)
Maximum I/O Current (total) 200mA (PDIP)
Maximum I/O Current (total) 400mA (QFP/MLF)

ATmega8535 Datasheet

Link to ATmega162 datasheet from Atmel's website.

ATmega8535 Pinout

ATmega8535-PU pinout ATmega8535-AU pinout

ATmega8535 "Minimal" Circuit Diagram

The circuit below shows an expanded memory bus configuration on the ATmega8535.

ATmega8535 minimal schematic diagram