354 Simple QSPI DAC

354 : Simple QSPI DAC

Design render
  • Author: Piotr Kuligowski
  • Description: Simple implementation of 8-bit R-2R DAC using QSPI interface + bi-directional port test breakout.
  • GitHub repository
  • View in Wokwi
  • Clock: 0 Hz

How it works

After reset, it is a very simple QSPI-based, 8-bit DAC (digital to analog converter). You feed it with 4-bit halves, which are then read on each rising edge of CLK. It also breakouts UIO's pins to test it externally (delays, electrical characteristics, etc).

How to test

After power up set nCS high, set RST_N low, then set RST_N high. If you want to set a new DAC value, first set nCS low, then set 4-bits, beginning from the lowest half. Now trigger a rising edge of CLK, set highest 4-bits and trigger another rising edge of CLK. Now you can continue setting next bytes (divided into 4-bit halves) or set nCS high and start from the beginning, by setting nCS low. You can observe effects on the 7seg display or remove it and implement R-2R network to have the acutal DAC. There is also a break out of bi-directional ports to test them externally.

External hardware

To test the DAC you need to remove 7seg display and connect external R-2R network to implement DAC.

IO

#InputOutputBidirectional
0DATA0OUT0INTERMEDIATE0
1DATA1OUT1INTERMEDIATE1
2DATA2OUT2INTERMEDIATE2
3DATA3OUT3INTERMEDIATE3
4nCSOUT4TESTED_UIO
5OUT5TESTED_UIO_IN
6OUT6TESTED_UIO_OUT
7OUT7TESTED_UIO_OE

Chip location

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