Choose a tiny chip

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1

I just need a chip that support Rs-485 communicating and It should has 2-3 I/Os.
I have no ideas with that.

there is two baseline for that:

  1. Arduino platform base
  2. as cheap as possible

Thanks for help!

2

Go with 8-pin ATtiny85 with I2C/SPI communication and 4/3 IO lines.

3

14 pins probosal:

ATtiny841
pb0 XTAL - for stable Serial baud rate
pb1 XTAL
PB2 RX
PA7 TX
PA6 RS485 enable
PA5
PA4
PA3
PA2
PA1
PA0

4

The Attiny 1-series and 2-series support Rs-485 in the USART, are relative modern MCU's and cost less than 1€.

For example, the ATTINY412 with 8 pins, or the ATTINY3224 with 14 pins.

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5

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