Added description of ESP32-PICO-KIT V4.1 board

docs/en/get-started/get-started-pico-kit.rst

@@ -1,14 +1,18 @@
-ESP32-PICO-KIT V4 Getting Started Guide
-=======================================
+ESP32-PICO-KIT V4 / V4.1 Getting Started Guide
+==============================================
 :link_to_translation:`zh_CN:[中文]`
 
-This user guide shows how to get started with the ESP32-PICO-KIT V4 mini development board. For description of other versions of the ESP32-PICO-KIT check :doc:`../hw-reference/index`.
+This user guide shows how to get started with the ESP32-PICO-KIT V4 / V4.1 mini development board. For description of other versions of the ESP32-PICO-KIT check :doc:`../hw-reference/index`.
+
+.. note::
+
+    This particular description covers ESP32-PICO-KIT V4 and V4.1. The difference is USB-UART bridge that has been changed from CP2102 in V4 to CP2102N in V4.1. The first provides up to 1 Mbps transfer rates, while the later up to 3 Mbps transfer rates.
 
 
 What You Need
 -------------
 
-* 1 × :ref:`ESP32-PICO-KIT V4 mini development board <get-started-pico-kit-v4-board-front>`
+* 1 × :ref:`ESP32-PICO-KIT mini development board <get-started-pico-kit-v4-board-front>`
 * 1 × USB A / Micro USB B cable
 * 1 × PC loaded with Windows, Linux or Mac OS
 
@@ -18,39 +22,39 @@ If you like to start using this board right now, go directly to section `Start A
 Overview
 --------
 
-ESP32-PICO-KIT V4 is a mini development board produced by `Espressif <https://espressif.com>`_. At the core of this board is the ESP32-PICO-D4, a System-in-Package (SIP) module with complete Wi-Fi and Bluetooth functionalities. Comparing to other ESP32 chips, the ESP32-PICO-D4 integrates several peripheral components in one single package, that otherwise would need to be installed separately. This includes a 40 MHz crystal oscillator, 4 MB flash, filter capacitors and RF matching links in. This greatly reduces quantity and costs of additional components, subsequent assembly and testing cost, as well as overall product complexity.
+ESP32-PICO-KIT is a mini development board produced by `Espressif <https://espressif.com>`_. At the core of this board is the ESP32-PICO-D4, a System-in-Package (SiP) module with complete Wi-Fi and Bluetooth functionalities. Comparing to other ESP32 modules, the ESP32-PICO-D4 integrates several peripheral components in one single package, that otherwise would need to be installed separately. This includes a 40 MHz crystal oscillator, a 4 MB flash, filter capacitors and RF matching links in. This greatly reduces quantity and costs of additional components, subsequent assembly and testing cost, as well as overall product complexity.
 
 The development board integrates a USB-UART Bridge circuit, allowing the developers to connect the board to a PC's USB port for downloads and debugging. 
 
-For easy interfacing, all the IO signals and system power on ESP32-PICO-D4 are led out through two rows of 20 x 0.1" pitch header pads on both sides of the development board. To make the ESP32-PICO-KIT V4 fit into mini breadboards, the header pads are populated with two rows of 17 pin headers. Remaining 2 x 3 pads grouped on each side of the board besides the antenna are not populated. The remaining 2 x 3 pin headers may be soldered later by the user. 
+For easy interfacing, all the IO signals and system power on ESP32-PICO-D4 are led out through two rows of 20 x 0.1" pitch header pads on both sides of the development board. To make the ESP32-PICO-KIT fit into mini breadboards, the header pads are populated with two rows of 17 pin headers. Remaining 2 x 3 pads grouped on each side of the board besides the antenna are not populated. The remaining 2 x 3 pin headers may be soldered later by the user. 
 
 .. note::
 
-    The 2 x 3 pads not populated with pin headers are internally connected to the flash memory embedded in the ESP32-PICO-D4 SIP module. For more details see module's datasheet in `Related Documents`_.
+    The 2 x 3 pads not populated with pin headers are internally connected to the flash memory embedded in the ESP32-PICO-D4 SiP module. For more details see module's datasheet in `Related Documents`_.
 
 The board dimensions are 52 x 20.3 x 10 mm (2.1" x 0.8" x 0.4"), see section `Board Dimensions`_. An overview functional block diagram is shown below.
 
 .. figure:: ../../_static/esp32-pico-kit-v4-functional-block-diagram.png
     :align: center
-    :alt: ESP32-PICO-KIT V4 functional block diagram
+    :alt: ESP32-PICO-KIT functional block diagram
     :figclass: align-center
 
-    ESP32-PICO-KIT V4 functional block diagram
+    ESP32-PICO-KIT functional block diagram
 
 
 Functional Description
 ----------------------
 
-The following list and figure below describe key components, interfaces and controls of ESP32-PICO-KIT V4 board.
+The following list and figure below describe key components, interfaces and controls of ESP32-PICO-KIT board.
 
 ESP32-PICO-D4
-    Standard ESP32-PICO-D4 module soldered to the ESP32-PICO-KIT V4 board. The complete system of the ESP32 chip has been integrated into the SIP module, requiring only external antenna with LC matching network, decoupling capacitors and pull-up resistors for EN signals to function properly.
+    Standard ESP32-PICO-D4 module soldered to the ESP32-PICO-KIT board. The complete system of the ESP32 chip has been integrated into the SiP module, requiring only external antenna with LC matching network, decoupling capacitors and pull-up resistors for EN signals to function properly.
 LDO
     5V-to-3.3V Low dropout voltage regulator (LDO).
 USB-UART Bridge
-    A single chip USB-UART bridge provides up to 1 Mbps transfers rates.
+    A single chip USB-UART bridge: CP2102 in V4 of the board and CP2102N in V4.1. The first provides up to 1 Mbps transfer rates, while the latter up to 3 Mbps transfers rates.
 Micro USB Port
-    USB interface. It functions as the power supply for the board and the communication interface between PC and ESP32-PICO-KIT V4.
+    USB interface. It functions as the power supply for the board and the communication interface between PC and ESP32-PICO-KIT.
 5V Power On LED
     This light emitting diode lits when the USB or an external 5V power supply is applied to the board. For details see schematic in `Related Documents`_.
 I/O
@@ -62,18 +66,18 @@ EN Button
 
 .. _get-started-pico-kit-v4-board-front:
 
-.. figure:: ../../_static/esp32-pico-kit-v4-layout.jpg
+.. figure:: ../../_static/esp32-pico-kit-v4.1-layout.jpg
     :align: center
-    :alt: ESP32-PICO-KIT V4 board layout
+    :alt: ESP32-PICO-KIT board layout
     :figclass: align-center
 
-    ESP32-PICO-KIT V4 board layout
+    ESP32-PICO-KIT board layout
 
 
 Power Supply Options
 --------------------
 
-There following options are available to provide power supply to the ESP32-PICO-KIT V4:
+The following options are available to provide power supply to the ESP32-PICO-KIT:
 
 1. Micro USB port, this is default power supply connection
 2. 5V / GND header pins
@@ -87,7 +91,7 @@ There following options are available to provide power supply to the ESP32-PICO-
 Start Application Development
 -----------------------------
 
-Before powering up the ESP32-PICO-KIT V4, please make sure that the board has been received in good condition with no obvious signs of damage.
+Before powering up the ESP32-PICO-KIT, please make sure that the board has been received in good condition with no obvious signs of damage.
 
 To start development of applications, proceed to section :doc:`index`, that will walk you through the following steps:
 
@@ -183,25 +187,29 @@ No.     Name               Type    Function
 Board Dimensions
 ----------------
 
-.. figure:: ../../_static/esp32-pico-kit-v4-dimensions-back.jpg
+.. figure:: ../../_static/esp32-pico-kit-v4.1-dimensions-back.jpg
     :align: center
-    :alt: ESP32-PICO-KIT V4 dimensions - back
+    :alt: ESP32-PICO-KIT dimensions - back
     :figclass: align-center
 
-    ESP32-PICO-KIT V4 dimensions - back
+    ESP32-PICO-KIT dimensions - back
 
 .. figure:: ../../_static/esp32-pico-kit-v4-dimensions-side.jpg
     :align: center
-    :alt: ESP32-PICO-KIT V4 dimensions - side
+    :alt: ESP32-PICO-KIT dimensions - side
     :figclass: align-center
 
-    ESP32-PICO-KIT V4 dimensions - side
+    ESP32-PICO-KIT dimensions - side
+
+For the board physical construction details please refer to Reference Design listed below.
 
 
 Related Documents
 -----------------
 
 * `ESP32-PICO-KIT V4 schematic <https://dl.espressif.com/dl/schematics/esp32-pico-kit-v4_schematic.pdf>`_ (PDF)
+* `ESP32-PICO-KIT V4.1 schematic <https://dl.espressif.com/dl/schematics/esp32-pico-kit-v4.1_schematic.pdf>`_ (PDF)
+* `ESP32-PICO-KIT Reference Design <https://www.espressif.com/en/support/download/documents?keys=ESP32-PICO-KIT+Reference+Design>`_ containing OrCAD schematic, PCB layout, gerbers and BOM
 * `ESP32-PICO-D4 Datasheet <http://espressif.com/sites/default/files/documentation/esp32-pico-d4_datasheet_en.pdf>`_ (PDF)
 * :doc:`../hw-reference/index`
 

docs/en/hw-reference/modules-and-boards-previous.rst

@@ -1,19 +1,43 @@
 .. _esp-modules-and-boards-previous:
 
+*********************************************
 Previous Versions of ESP32 Modules and Boards
-=============================================
+*********************************************
 
 This sections contains overview and links to documentation of previous version ESP32 Modules and Boards that have been replaced with newer versions or discontinued. It is maintained for convenience of users as several of these boards are still in use and some may still be available for purchase. 
 
 To see the latest development boards, please refer to section :ref:`esp-modules-and-boards`.
 
 
+.. _esp-modules-and-boards-esp32-pico-pit-v4:
+
+ESP32-PICO-KIT V4
+=================
+
+The smallest ESP32 development board with all the components required to connect it directly to a PC USB port, and pin headers to plug into a mini breadboard. It is equipped with ESP32-PICO-D4 module that integrates 4 MB flash memory, a crystal oscillator, filter capacitors and RF matching circuit in one single package. As result, the fully functional development board requires only a few external components that can easy fit on a 20 x 52 mm PCB including antenna, LDO, USB-UART bridge and two buttons to reset it and put into download mode. 
+
+.. figure:: https://dl.espressif.com/dl/schematics/pictures/esp32-pico-kit-v4.jpeg
+    :align: center
+    :alt: ESP32-PICO-KIT V4 board
+    :width: 50%
+
+    ESP32-PICO-KIT V4 board
+
+Comparing to ESP32-PICO-KIT V3, this version has revised printout and reduced number of exposed pins. Instead of 20, only 17 header pins are populated, so V4 can fit into a mini breadboard.
+
+Documentation
+-------------
+
+* :doc:`../get-started/get-started-pico-kit`
+* `ESP32-PICO-KIT V4 Schematic <https://dl.espressif.com/dl/schematics/esp32-pico-kit-v4_schematic.pdf>`_ (PDF)
+* `ESP32-PICO-D4 Datasheet <http://espressif.com/sites/default/files/documentation/esp32-pico-d4_datasheet_en.pdf>`_ (PDF)
+
 .. _esp-modules-and-boards-esp32-pico-pit-v3:
 
 ESP32-PICO-KIT V3
------------------
+=================
 
-The first public release of Espressif's ESP32-PICO-D4 chip on a mini development board. The board has a USB port for programming and debugging and two rows of 20 pin headers to plug into a breadboard. The ESP32-PICO-D4 chip itself is small and requires only a few external components. Besides two core CPUs it integrates 4MB flash memory, a crystal oscillator and antenna matching components in one single 7 x 7 mm package. As a result the chip and all the components making the complete development board fit into 20 x 52 mm PCB. 
+The first public release of Espressif's ESP32-PICO-D4 module on a mini development board. The board has a USB port for programming and debugging and two rows of 20 pin headers to plug into a breadboard. The ESP32-PICO-D4 module itself is small and requires only a few external components. Besides two core CPUs it integrates 4MB flash memory, a crystal oscillator and antenna matching components in one single 7 x 7 mm package. As a result the module and all the components making the complete development board fit into 20 x 52 mm PCB. 
 
 .. figure:: https://dl.espressif.com/dl/schematics/pictures/esp32-pico-kit-v3.jpeg
     :align: center
@@ -23,7 +47,7 @@ The first public release of Espressif's ESP32-PICO-D4 chip on a mini development
     ESP32-PICO-KIT V3 board
 
 Documentation
-"""""""""""""
+-------------
 
 * :doc:`../get-started/get-started-pico-kit-v3`
 * `ESP32-PICO-KIT V3 Schematic <https://dl.espressif.com/dl/schematics/esp32-pico-kit-v3_schematic.pdf>`_ (PDF)
@@ -33,7 +57,7 @@ Documentation
 .. _esp-modules-and-boards-esp32-devkitc-v2:
 
 ESP32 Core Board V2 / ESP32 DevKitC
------------------------------------
+===================================
 
 Small and convenient development board with ESP-WROOM-32 module installed, break out pin headers and minimum additional components. Includes USB to serial programming interface, that also provides power supply for the board. Has pushbuttons to reset the board and put it in upload mode. 
 
@@ -45,7 +69,7 @@ Small and convenient development board with ESP-WROOM-32 module installed, break
     ESP32 Core Board V2 / ESP32 DevKitC board
 
 Documentation
-"""""""""""""
+-------------
 
 * :doc:`../get-started/get-started-devkitc-v2`
 * `ESP32 DevKitC V2 Schematic <https://dl.espressif.com/dl/schematics/ESP32-Core-Board-V2_sch.pdf>`__ (PDF)
@@ -55,7 +79,7 @@ Documentation
 .. _esp-modules-and-boards-esp-wrover-kit-v1:
 
 ESP-WROVER-KIT V1 / ESP32 DevKitJ V1
-------------------------------------
+====================================
 
 The first version of ESP-WROVER-KIT development board. Shipped with ESP-WROOM-32 on board.
 
@@ -74,7 +98,7 @@ All versions of ESP-WROVER-KIT are ready to accommodate an ESP-WROOM-32 or ESP32
 The board has red soldermask.
 
 Documentation
-"""""""""""""
+-------------
 
 * `ESP-WROVER-KIT V1 Schematic <https://dl.espressif.com/dl/schematics/ESP32-DevKitJ-v1_sch.pdf>`__ (PDF)
 * :doc:`../api-guides/jtag-debugging/index`
@@ -84,7 +108,7 @@ Documentation
 .. _esp-modules-and-boards-esp-wrover-kit-v2:
 
 ESP-WROVER-KIT V2
------------------
+=================
 
 This is updated version of ESP32 DevKitJ V1 described above with design improvements identified when DevKitJ was in use, e.g. improved support for SD card. By default board has ESP-WROOM-32 module installed.
 
@@ -98,7 +122,7 @@ This is updated version of ESP32 DevKitJ V1 described above with design improvem
 Comparing to previous version, this board has a shiny black finish and a male camera header.
 
 Documentation
-"""""""""""""
+-------------
 
 * :doc:`../get-started/get-started-wrover-kit-v2`
 * `ESP-WROVER-KIT V2 Schematic <https://dl.espressif.com/dl/schematics/ESP-WROVER-KIT_SCH-2.pdf>`__ (PDF)
@@ -109,7 +133,7 @@ Documentation
 .. _esp-modules-and-boards-esp32-demo-board-v2:
 
 ESP32 Demo Board V2
--------------------
+===================
 
 One of first feature rich evaluation boards that contains several pin headers, dip switches, USB to serial programming interface, reset and boot mode press buttons, power switch, 10 touch pads and separate header to connect LCD screen.
 
@@ -122,14 +146,14 @@ One of first feature rich evaluation boards that contains several pin headers, d
 Production of this board is discontinued.
 
 Documentation
-"""""""""""""
+-------------
 
 * `ESP32 Demo Board V2 Schematic <https://dl.espressif.com/dl/schematics/ESP32-Demo-Board-V2_sch.pdf>`__ (PDF)
 * `FTDI Virtual COM Port Drivers`_
 
 
 Related Documents
------------------
+=================
 
 * :doc:`modules-and-boards`
 

docs/en/hw-reference/modules-and-boards.rst

@@ -123,33 +123,34 @@ Documentation
 * `ESP32-WROVER Reference Design <https://www.espressif.com/en/support/download/documents?keys=ESP32-WROVER+Reference+Design>`_ containing OrCAD schematic, PCB layout, gerbers and BOM
 
 
-.. _esp-modules-and-boards-esp32-pico-pit-v4:
+.. _esp-modules-and-boards-esp32-pico-pit-v4.1:
 
-ESP32-PICO-KIT V4
-=================
+ESP32-PICO-KIT V4.1
+===================
 
-The smallest ESP32 development board with all the components required to connect it directly to a PC USB port, and pin headers to plug into a mini breadboard. It is equipped with ESP32-PICO-D4 chip that integrates 4MB flash memory, a crystal oscillator, filter capacitors and RF matching circuit in one single package. As result the fully functional development board requires only a few external components that can easy fit on a 20 x 52 mm PCB including antenna, LDO, USB-UART bridge and two buttons to reset it and put into download mode. 
+The smallest ESP32 development board with all the components required to connect it directly to a PC USB port, and pin headers to plug into a mini breadboard. It is equipped with ESP32-PICO-D4 module that integrates 4 MB flash memory, a crystal oscillator, filter capacitors and RF matching circuit in one single package. As result, the fully functional development board requires only a few external components that can easy fit on a 20 x 52 mm PCB including antenna, LDO, USB-UART bridge and two buttons to reset it and put into download mode. 
 
-.. figure:: https://dl.espressif.com/dl/schematics/pictures/esp32-pico-kit-v4.jpeg
+.. figure:: https://dl.espressif.com/dl/schematics/pictures/esp32-pico-kit-v4.1.jpg
     :align: center
-    :alt: ESP32-PICO-KIT V4 board
+    :alt: ESP32-PICO-KIT V4.1 board
     :width: 50%
 
-    ESP32-PICO-KIT V4 board
-
-Comparing to ESP32-PICO-KIT V3, this version has revised printout and reduced number of exposed pins. Instead of 20, only 17 header pins are populated, so V4 can fit into a mini breadboard. 
+    ESP32-PICO-KIT V4.1 board
 
+Comparing to ESP32-PICO-KIT V4, this version contains a more capable CP2102N USB-UART bridge that provides up to 3 Mbps transfers rates.
 
 Documentation
 -------------
 
 * :doc:`../get-started/get-started-pico-kit`
-* `ESP32-PICO-KIT V4 Schematic <https://dl.espressif.com/dl/schematics/esp32-pico-kit-v4_schematic.pdf>`_ (PDF)
+* `ESP32-PICO-KIT V4.1 Schematic <https://dl.espressif.com/dl/schematics/esp32-pico-kit-v4.1_schematic.pdf>`_ (PDF)
+* `ESP32-PICO-KIT Reference Design <https://www.espressif.com/en/support/download/documents?keys=ESP32-PICO-KIT+Reference+Design>`_ containing OrCAD schematic, PCB layout, gerbers and BOM
 * `ESP32-PICO-D4 Datasheet <http://espressif.com/sites/default/files/documentation/esp32-pico-d4_datasheet_en.pdf>`_ (PDF)
 
 Previous Versions
 -----------------
 
+* :ref:`esp-modules-and-boards-esp32-pico-pit-v4`
 * :ref:`esp-modules-and-boards-esp32-pico-pit-v3`