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doc(psram): updated voltage supply for psram programming guide

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Armando 2023-12-18 11:09:21 +08:00
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11
docs/en/api-guides/external-ram.rst
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@ -24,7 +24,16 @@ Hardware
.. note::
Some PSRAM chips are 1.8 V devices and some are 3.3 V. The working voltage of the PSRAM chip must match the working voltage of the flash component. Consult the datasheet for your PSRAM chip and {IDF_TARGET_NAME} device to find out the working voltages. For a 1.8 V PSRAM chip, make sure to either set the MTDI pin to a high signal level on bootup, or program {IDF_TARGET_NAME} eFuses to always use the VDD_SIO level of 1.8 V. Not doing this can damage the PSRAM and/or flash chip.
.. only:: esp32 or esp32s2 or esp32s3
Some PSRAM chips are 1.8 V devices and some are 3.3 V. The working voltage of the PSRAM chip must match the working voltage of the flash component. Consult the datasheet for your PSRAM chip and {IDF_TARGET_NAME} device to find out the working voltages. For a 1.8 V PSRAM chip, make sure to either set the MTDI pin to a high signal level on bootup, or program {IDF_TARGET_NAME} eFuses to always use the VDD_SIO level of 1.8 V. Not doing this can damage the PSRAM and/or flash chip.
.. only:: esp32p4
Some PSRAM chips are 1.8 V devices and some are 3.3 V. Consult the datasheet for your PSRAM chip and {IDF_TARGET_NAME} device to find out the working voltages.
By default PSRAM is powered up by the on-chip LDO2, you can use :ref:`CONFIG_SPIRAM_LDO_ID` to switch the LDO ID according. Setting this value to -1 for using external power supply.
By default PSRAM connected LDO is set to correct voltage according to the used Espressif module. You can still use :ref:`CONFIG_SPIRAM_LDO_VOLTAGE_MV` to select LDO output voltage if you do not use an Espressif module. When using external power supply, this option does not exist.
.. note::