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README.md

Arduino CI License: MIT GitHub release

DAC8551

Arduino library for DAC8501 DAC8531, DAC8550, DAC8551 SPI Digital Analog Convertor

Description

The DAC8551 is a SPI based 16 bit DAC with one channel.

The DAC8501, DAC8531 and DAC8550 are drop in compatible They all have classed derived 1 to 1 from DAC8551.

Warning this library is not tested extensively

Interface

Core

  • DAC8501(uint8_t slaveSelect) Constructor for DAC8501 with hardware SPI,
  • DAC8531(uint8_t slaveSelect) Constructor for DAC8531 with hardware SPI,
  • DAC8550(uint8_t slaveSelect) Constructor for DAC8550 with hardware SPI,
  • DAC8551(uint8_t slaveSelect) Constructor for DAC8551 with hardware SPI, since 0.2.0 the slaveSelect pin needs to be defined.
  • DAC8501(uint8_t spiData, uint8_t spiClock, uint8_t slaveSelect) Constructor for the software SPI
  • DAC8531(uint8_t spiData, uint8_t spiClock, uint8_t slaveSelect) Constructor for the software SPI
  • DAC8550(uint8_t spiData, uint8_t spiClock, uint8_t slaveSelect) Constructor for the software SPI
  • DAC8551(uint8_t spiData, uint8_t spiClock, uint8_t slaveSelect) Constructor for the software SPI
  • void begin() initializes all pins to default state
  • void setValue(uint16_t value) set the value of the channel to 0 - 65535
  • uint16_t getValue() returns the last value written.

Power down

check datasheet for details.

  • void setPowerDown(uint8_t powerDownMode) sets power down mode. 0 - 3.
  • uint8_t getPowerDownMode() returns last written mode.
Power down mode Value
DAC8551_POWERDOWN_NORMAL 0
DAC8551_POWERDOWN_1K 1
DAC8551_POWERDOWN_100K 2
DAC8551_POWERDOWN_HIGH_IMP 3

DAC8501, DAC8531 and DAC8550 uses the same constants.

Future

  • more testing
  • investigate differences between 8551 and 8550.

Operation

See examples

demo_hw_spi.ino

  • write a sawtooth to channel A followed by a sinus
  • uses HW SPI

demo_sw_spi.ino

  • write a sawtooth to channel A followed by a sinus
  • uses SW SPI

demo_powerdown.ino

  • idem