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docs(dac): added the explanation to Vref (v5.1)

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laokaiyao
2023-08-17 18:29:58 +08:00
parent 6ff4bb0994
commit 1880ddca9e
2 changed files with 8 additions and 6 deletions
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7
docs/en/api-reference/peripherals/dac.rst
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@@ -3,13 +3,14 @@ Digital To Analog Converter (DAC)
:link_to_translation:`zh_CN:[中文]`
{IDF_TARGET_DAC_CH_1: default = "GPIO25", esp32 = "GPIO25", esp32s2 = "GPIO17"}
{IDF_TARGET_DAC_CH_2: default = "GPIO26", esp32 = "GPIO26", esp32s2 = "GPIO18"}
{IDF_TARGET_DAC_CH_1: default = "Not Updated!", esp32 = "GPIO25", esp32s2 = "GPIO17"}
{IDF_TARGET_DAC_CH_2: default = "Not Updated!", esp32 = "GPIO26", esp32s2 = "GPIO18"}
{IDF_TARGET_DAC_REF_PIN: default = "Not Updated!", esp32 = "VDD3P3_RTC", esp32s2 = "VDD3P3_RTC_IO"}
Overview
--------
{IDF_TARGET_NAME} has two 8-bit DAC (digital to analog converter) channels respectively connected to {IDF_TARGET_DAC_CH_1} (Channel 1) and {IDF_TARGET_DAC_CH_2} (Channel 2). Each DAC channel can convert the digital value 0~255 to the analog voltage 0~Vref. The output voltage can be calculated as the following::
{IDF_TARGET_NAME} has two 8-bit DAC (digital to analog converter) channels respectively connected to {IDF_TARGET_DAC_CH_1} (Channel 1) and {IDF_TARGET_DAC_CH_2} (Channel 2). Each DAC channel can convert the digital value 0~255 to the analog voltage 0~Vref (the reference voltage 'Vref' here is input from the pin {IDF_TARGET_DAC_REF_PIN}, which ideally equals to the power supply VDD). The output voltage can be calculated as the following::
out_voltage = Vref * digi_val / 255