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docs(dac): added the explanation to Vref

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laokaiyao
2023-08-17 18:29:58 +08:00
parent cc01cc13aa
commit a66898ad42
2 changed files with 8 additions and 6 deletions
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docs/zh_CN/api-reference/peripherals/dac.rst
+4 -3
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@@ -3,13 +3,14 @@
:link_to_translation:`en:[English]`
{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"}
概况
----
{IDF_TARGET_NAME} 有两个 8 位数模转换器 (DAC) 通道，分别连接到 {IDF_TARGET_DAC_CH_1}（通道 1）和 {IDF_TARGET_DAC_CH_2}（通道 2）。每个 DAC 通道可以将数字值 0~255 转换成模拟电压 0~Vref。输出电压可按以下方式计算::
{IDF_TARGET_NAME} 有两个 8 位数模转换器 (DAC) 通道，分别连接到 {IDF_TARGET_DAC_CH_1}（通道 1）和 {IDF_TARGET_DAC_CH_2}（通道 2）。每个 DAC 通道可以将数字值 0~255 转换成模拟电压 0~Vref （此处的 Vref 为 {IDF_TARGET_DAC_REF_PIN} 引脚输入的参考电压，一般来说其输入的电压值应等于电源电压 VDD）。输出电压可按以下方式计算::
out_voltage = Vref * digi_val / 255