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Docs: update CN translation for esp_http_client.rst, external-ram.rst, bootloader.rst

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Mo Fei Fei
2023-04-19 10:37:49 +08:00
parent a4cf0e24ac
commit 0d2549a4f1
7 changed files with 77 additions and 34 deletions
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docs/en/api-reference/peripherals/usb_device.rst
+4 -4
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@@ -60,8 +60,8 @@ Configuration
Via Menuconfig options you can specify:
- Several of descriptor's parameters (see: Descriptors Configuration bellow)
- USB Serial low-level Configuration
- Several descriptor's parameters (see Descriptors Configuration below)
- USB Serial low-level configuration
- The verbosity of the TinyUSB's log
- Disable the TinyUSB main task (for the custom implementation)
@@ -103,9 +103,9 @@ To initialize the driver, users should call :cpp:func:`tinyusb_driver_install`.
Self-Powered Device
-------------------
USB specification mandates self-powered devices to monitor voltage level on USB's VBUS signal. As opposed to bus-powered devices, a self-powered device can be fully functional even without USB connection. The self-powered device detects connection and disconnection events by monitoring the VBUS voltage level. VBUS is considered valid if it rises above 4.75V and invalid if it falls below 4.35V.
USB specification mandates self-powered devices to monitor voltage level on USB's VBUS signal. As opposed to bus-powered devices, a self-powered device can be fully functional even without USB connection. The self-powered device detects connection and disconnection events by monitoring the VBUS voltage level. VBUS is considered valid if it rises above 4.75 V and invalid if it falls below 4.35 V.
No {IDF_TARGET_NAME} pin is 5V tolerant, so you must connect the VBUS to {IDF_TARGET_NAME} via a comparator with voltage thresholds as described above, or use a simple resistor voltage divider that will output (0.75 x Vdd) if VBUS is 4.4V (see figure below). In both cases, voltage on the sensing pin must be logic low within 3ms after the device is unplugged from USB host.
No {IDF_TARGET_NAME} pin is 5 V tolerant, so you must connect the VBUS to {IDF_TARGET_NAME} via a comparator with voltage thresholds as described above, or use a simple resistor voltage divider that will output (0.75 x Vdd) if VBUS is 4.4 V (see figure below). In both cases, voltage on the sensing pin must be logic low within 3 ms after the device is unplugged from USB host.
.. figure:: ../../../_static/diagrams/usb/usb_vbus_voltage_monitor.png
:align: center