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103 lines
3.5 KiB
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103 lines
3.5 KiB
ReStructuredText
MCP4728 Component
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=================
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.. seo::
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:description: Instructions for setting up MCP4728 outputs on the ESP.
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:image: mcp4728.jpg
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.. _mcp4728-component:
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The MCP4728 output component allows to use `12bit external quad DAC
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<https://www.adafruit.com/product/4470>`__
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in order to have analog outputs on any board by using :ref:`I²C <i2c>`. Devices default address is ``0x60``.
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If you only have one, it is not necessary to explicitly specify the ``mcp4728:`` component in the config unless you need to change the parameters.
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It will be automatically created with the default settings if you use it.
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.. code-block:: yaml
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# Example configuration entry
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# Set a global I²C connection
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i2c:
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sda: 21
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scl: 22
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scan: true
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# Set the component with default (address: 0x60 / global I²C)
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mcp4728:
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- id: dac_output
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Configuration variables:
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------------------------
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- **id** (*Optional*, :ref:`config-id`): The id to use for this output component.
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- **address** (*Optional*, int): Manually specify the I2C address of
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the DAC. Defaults to ``0x60``.
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- **store_in_eeprom** (*Optional*, boolean): Use SEQ_WRITE mode to also write to EEPROM sequentially. Defaults to ``false``.
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MCP4728 Output
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**************
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The MCP4728 output component exposes 4 MCP4728 channels of a global :ref:`MCP4728 <mcp4728-component>` as float outputs.
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.. code-block:: yaml
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# Individual outputs
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output:
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- platform: mcp4728
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id: ac_dimmer_1
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mcp4728_id: dac_output
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channel: A
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vref: vdd
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power_down: normal # default
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- platform: mcp4728
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id: ac_dimmer_2
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mcp4728_id: dac_output
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channel: B
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vref: vdd
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power_down: gnd_1k
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- platform: mcp4728
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id: ac_dimmer_3
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channel: C
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vref: internal
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gain: X1
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power_down: normal # default
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- platform: mcp4728
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id: ac_dimmer_4
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channel: D
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vref: internal
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gain: X2
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on_...:
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then:
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- output.set_level:
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id: ac_dimmer_1
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level: 100%
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Configuration variables:
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------------------------
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- **id** (**Required**, :ref:`config-id`): The id to use for this output component.
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- **mcp4728_id** (*Optional*, :ref:`config-id`): Manually specify the ID of the
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:ref:`MCP4728 <mcp4728-component>`.
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Use this if you have multiple MCP4728 chains you want to use at the same time.
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- **channel** (**Required**, string): Chose the channel of the MCP4728 chain of
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this output component. One of ``A``, ``B``, ``C`` or ``D``.
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- **vref** (*Optional*, string): Chose the VREF source. One of ``vdd`` or ``internal``. Defaults to ``vdd``.
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- **gain** (*Optional*, string): Chose the GAIN multiplier for internal VREF. One of ``X1`` or ``X2``. Only useful when ``vdd=internal``. Defaults to ``X1``.
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- **power_down** (*Optional*, string): Chose the power down mode. In power down mode (value different from ``normal``) the output pin will be connected to GND using a resistor (1kOhm, 100kOhm or 500kOhm). One of ``normal``, ``gnd_1k``, ``gnd_100k`` or ``gnd_500k``. Defaults to ``normal``.
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- All other options from :ref:`Output <config-output>`.
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Output voltage range will be different depending on the ``vref`` source and ``gain``.
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When ``vref=vdd``, output voltage will range from 0.000V to VDD.
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When ``vref=internal``, output voltage will range from 0.000V to 2.048V with ``gain=X1`` and from 0.000V to 4.096V with ``gain=X2``.
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See Also
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--------
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- :doc:`/components/output/index`
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- :doc:`/components/output/esp32_dac`
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- :apiref:`mcp4728/mcp4728.h`
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- :ghedit:`Edit`
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