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projects: led: ltc3220: add README documentation for LTC3220
Added project documentation for LTC3220 Driver Example Signed-off-by: Jan Carlo Roleda <jancarlo.roleda@analog.com>
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‎doc/sphinx/source/projects/led/ltc3220.rst‎

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.. include:: ../../../../../drivers/led/ltc3220/README.rst

‎projects/ltc3220/README.rst‎

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Evaluating the LTC3220
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======================
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Supported Evaluation Boards
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---------------------------
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* DC1265A-A (LTC3220)
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* DC1265A-B (LTC3220-1)
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Overview
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--------
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The LTC3220/LTC3220-1 are highly integrated multi-display LED drivers.
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These parts contain a high efficiency, low noise charge pump to provide power
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to up to eighteen universal LED current sources.The LED currents are set by an
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internal precision current reference. Independent dimming, on/off, blinking and
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gradation control for all universal current sources are achieved via the
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I2C serial interface. 6-bit linear DACs are available to adjust brightness
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levels independently for each universal LED current source.
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The LTC3220/LTC3220-1 charge pump optimizes efficiency based on the voltage
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across the LED current sources. The part powers up in 1x mode and will
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automatically switch to boost mode whenever any enabled LED current source
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begins to enter dropout. The first dropout switches the parts into 1.5x mode
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and a subsequent dropout switches the LTC3220/LTC3220-1 into 2x mode.
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The LTC3220 maintains an I2C address of 0x1C. Its LTC3220-1 maintains an address
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of 0x1D. There is no other difference between the two apart from this.
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Power Supply Requirements
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-------------------------
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A seperate power supply capable of providing 3V, up to 400mA is required for
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the device's maximum capabilities. The logic signals used for the I2C protocol
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uses 3.3V via the controller as a logic high reference.
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**Pin Description**:
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+-----+-----------+-------------------------------------------+
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| Pin | Name | Description |
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+-----+-----------+-------------------------------------------+
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| 1 | ULED1 | Current Source Output 1 |
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+-----+-----------+-------------------------------------------+
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| 2 | ULED2 | Current Source Output 2 |
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+-----+-----------+-------------------------------------------+
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| 3 | ULED3 | Current Source Output 3 |
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+-----+-----------+-------------------------------------------+
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| 4 | ULED4 | Current Source Output 4 |
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+-----+-----------+-------------------------------------------+
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| 5 | ULED5 | Current Source Output 5 |
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+-----+-----------+-------------------------------------------+
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| 6 | ULED6 | Current Source Output 6 |
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+-----+-----------+-------------------------------------------+
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| 7 | ULED7 | Current Source Output 7 |
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+-----+-----------+-------------------------------------------+
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| 8 | ULED8 | Current Source Output 8 |
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+-----+-----------+-------------------------------------------+
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| 9 | ULED9 | Current Source Output 9 |
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+-----+-----------+-------------------------------------------+
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| 10 | V_CC | Digital I/O Supply Voltage |
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+-----+-----------+-------------------------------------------+
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| 11 | SCL | I2C Clock Input |
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+-----+-----------+-------------------------------------------+
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| 12 | SDA | I2C Data Input |
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+-----+-----------+-------------------------------------------+
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| 13 | ULED10 | Current Source Output 10 |
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+-----+-----------+-------------------------------------------+
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| 14 | ULED11 | Current Source Output 11 |
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+-----+-----------+-------------------------------------------+
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| 15 | ULED12 | Current Source Output 12 |
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+-----+-----------+-------------------------------------------+
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| 16 | ULED13 | Current Source Output 13 |
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+-----+-----------+-------------------------------------------+
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| 17 | ULED14 | Current Source Output 14 |
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+-----+-----------+-------------------------------------------+
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| 18 | ULED15 | Current Source Output 15 |
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+-----+-----------+-------------------------------------------+
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| 19 | ULED16 | Current Source Output 16 |
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+-----+-----------+-------------------------------------------+
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| 20 | ULED17 | Current Source Output 17 |
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+-----+-----------+-------------------------------------------+
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| 21 | ULED18 | Current Source Output 18 |
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+-----+-----------+-------------------------------------------+
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| 24 | V_IN | Supply Voltage |
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+-----+-----------+-------------------------------------------+
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| 25 | RST | Active Low Reset Input |
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+-----+-----------+-------------------------------------------+
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| 28 | CPO | Charge Pump Output |
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+-----+-----------+-------------------------------------------+
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| 29 | GND | Ground Pad |
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+-----+-----------+-------------------------------------------+
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No-OS Build Setup
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-----------------
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Please refer to the Analog Wiki: https://wiki.analog.com/resources/no-os/build
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No-OS Supported Platforms
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-------------------------
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The initialization data used in the examples is taken out from:
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`Project Common Data Path <https://github.com/analogdevicesinc/no-OS/tree/main/projects/ltc3208/src/common>`_
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The macros used in Common data are defined in platfor-specific files found in:
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`Project Platform Configuration Path <https://github.com/analogdevicesinc/no-OS/tree/main/projects/ltc3208/src/platform>`_
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Maxim Platform
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--------------
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**Used Hardware**
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* `DC1265A-A <https://www.analog.com/en/resources/evaluation-hardware-and-software/evaluation-boards-kits/dc1265a-a.html>`_
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* `MAX32690 <https://www.analog.com/en/products/max32690.html>`_
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**Connections**:
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+----------+-----------------------+
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| LTC3220 | MAX32655 Pinouts |
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+----------+-----------------------+
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| V_IN | Power Supply |
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+----------+-----------------------+
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| V_CC | 3v3 |
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+----------+-----------------------+
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| GND | GND |
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+----------+-----------------------+
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| I2C_SCL | P2_8 |
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+----------+-----------------------+
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| I2C_SDA | P2_7 |
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+----------+-----------------------+
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| RST | P0_14 |
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+----------+-----------------------+
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** Build Command **
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.. code-block:: bash
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# to delete current build
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make reset
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#to build project
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make TARGET=max32690
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# to flash the code to the controller
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make TARGET=max32690 run

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