The CP2102-GM datasheet specifies three options for pin packaging for the QFN28 device (taken from CP2102 datasheet, page 12:
Although Silicon Labs CP2102 devices are generally shipped in the leftmost "Option 1"/"Irregular Corner" option, the other options are included because Silicon Labs reserves the right to ship these devices in any of those package varieties.
Regardless of the Pin 1 marking option used in a given device on the bottom of the device, the PCB landing pad configuration is the same for all CP2102 devices, and is given in the datasheet on page 13:
To avoid damage to the CP2102N device, a resistor divider MUST used in all power supply configurations when the VBUS pin is connected to a 5V USB VBUS supply. This is true whether the device is self-powered (i.e. VREGIN and VDD supplied from an external power supply) or the device is bus powered (i.e. VREGIN supplied from 5V USB VBUS and VDD is used as the 3.3 V internal regulator output.
There are two electrical specifications for this device that come into play in these situations. The first is the absolute maximum voltage requirement for all GPIO pins (including VBUS), given as VIO - 2.5 V in Table 3.10 on page 15 of the CP2102N datasheet, Rev. 1.2:
The second is the input high voltage for GPIO pins (including VBUS), which must be met for VBUS to accurately sense the device connection to USB. This spec is given in Table 3.7 on page 13 of the CP2102N datasheet, Rev. 1.2:
On devices with no VIO pin, then VIO = VDD for the purposes of the above specifications. The voltage divider requirement is necessary for self powered configurations to avoid exceeding the absolute maximum VBUS voltage specification in the case where the device is not powered but connected to USB. The voltage divider is necessary for bus-powered configuration in which the internal regulator is used in order to avoid damage to the device when VBUS = VREGIN = 5V but the regulator output (VDD) has not yet come up to 3.3 V.
The following diagrams show the correct use of the voltage divider with the recommended resistor values of 22.1 kOhm and 47.5 kOhm between USB VBUS supply and GND.
Self Powered mode:
Bus powered mode:
This information has been updated in the device datasheet and is reflected in the CP2102N datasheet, revision 1.2.
As macOS High Sierra 10.13 introduces a new feature that requires user approval before loading new third-party kernel extensions, referring to Apple Technical Note TN2459:
When you download the Mac OSX CP210x VCP driver v5 from the Silicon Labs website, approve the CP210x driver by clicking "Allow" in the Security & Privacy System Preferences panel as TN2459 mentioned to complete the installation of the driver.
It is possible to use the CP2615 USB-to-Audio bridge with a codec that does not have an I2C interface. However, an incorrect configuration of the CP2615 can prevent correct operation.
Primarily of concern is that the CP2615, if it is programmed to send I2C data to the codec, will hang if no I2C device is present. This occurs because the CP2615 will retry any failed I2C transactions forever. To prevent this from occurring, clear all I2C Strings from the configuration of the CP2615.
Also make sure to disable [Enable Playback Mute via Register] to prevent the CP2615 from attempting to use I2C commands to mute the codec.
You need to edit this string in a file to get the change into the application. If you Save to File, then modify the string in the file you saved, and then Read from File, the DacConfig string will be updated with the value you put in.
The CP210x driver v6.7.5 is now the "legacy" driver and can be used on Windows 7, 8 and 10. The differences between the two versions of the drivers can be explained in the following way -
2. Functional differences, i.e., why have v10.1.1?
The driver version v6.7.5 is for "Desktop" Editions of Windows 7 and later, i.e., Windows 7, 8, 8.1 and 10. Please note that these drivers are valid only for "Desktop" editions, i.e., PCs and servers. Windows v10.1.1 is a universal Windows driver. "Universal" was introduced by Microsoft in Windows 10. "Universal" means desktop plus embedded plus mobile, etc. editions of Windows that support Universal, i.e., Windows 10. For more information about Universal drivers, please refer to this article by Microsoft - https://docs.microsoft.com/en-us/windows-hardware/drivers/develop/getting-started-with-universal-drivers. This knowledge base article on our community forum has more information about universal drivers in general and driver v10.1.1 in particular - https://www.silabs.com/community/interface/knowledge-base.entry.html/2017/12/27/vcp_driver_-_windows-Ulur.
3. Serial Enumeration
Serial enumeration is enabled in v6.7.5 while v10.1.1 does not have serial enumeration enabled.
4. Legacy versus Current
Technically, the driver version v6.7.5 is almost a "legacy" driver. Windows and in turn Silicon Labs is planning to continue using only v10.1.1 and make edits (if necessary) to that version of the driver.
Please note that if you are running a desktop PC with Windows 10, you can use either v6.7.5 or v10.1.1 drivers on your system.
ctypes is a foreign function library for Python. It provides C compatible data types and allows calling functions in DLLs or shared libraries. It can be used to wrap these libraries in pure Python.
Loading DLL
dll = cdll.LoadLibrary("CP210xManufacturing.dll")
Load a shared library into the process and return it. This method always returns a new instance of the library.
3. Call functions inside the DLL
Some functions contain pointer parameters, like this one:
Interface Knowledge Base
CP2102 Pin 1 Identifier and Packaging Options
The CP2102-GM datasheet specifies three options for pin packaging for the QFN28 device (taken from CP2102 datasheet, page 12:
Although Silicon Labs CP2102 devices are generally shipped in the leftmost "Option 1"/"Irregular Corner" option, the other options are included because Silicon Labs reserves the right to ship these devices in any of those package varieties.
Regardless of the Pin 1 marking option used in a given device on the bottom of the device, the PCB landing pad configuration is the same for all CP2102 devices, and is given in the datasheet on page 13:
CP2102N requires a voltage divider on VBUS
To avoid damage to the CP2102N device, a resistor divider MUST used in all power supply configurations when the VBUS pin is connected to a 5V USB VBUS supply. This is true whether the device is self-powered (i.e. VREGIN and VDD supplied from an external power supply) or the device is bus powered (i.e. VREGIN supplied from 5V USB VBUS and VDD is used as the 3.3 V internal regulator output.
There are two electrical specifications for this device that come into play in these situations. The first is the absolute maximum voltage requirement for all GPIO pins (including VBUS), given as VIO - 2.5 V in Table 3.10 on page 15 of the CP2102N datasheet, Rev. 1.2:
The second is the input high voltage for GPIO pins (including VBUS), which must be met for VBUS to accurately sense the device connection to USB. This spec is given in Table 3.7 on page 13 of the CP2102N datasheet, Rev. 1.2:
On devices with no VIO pin, then VIO = VDD for the purposes of the above specifications. The voltage divider requirement is necessary for self powered configurations to avoid exceeding the absolute maximum VBUS voltage specification in the case where the device is not powered but connected to USB. The voltage divider is necessary for bus-powered configuration in which the internal regulator is used in order to avoid damage to the device when VBUS = VREGIN = 5V but the regulator output (VDD) has not yet come up to 3.3 V.
The following diagrams show the correct use of the voltage divider with the recommended resistor values of 22.1 kOhm and 47.5 kOhm between USB VBUS supply and GND.
Self Powered mode:
Bus powered mode:
This information has been updated in the device datasheet and is reflected in the CP2102N datasheet, revision 1.2.
USB to UART Bridge VCP driver, installation on Mac OSX High Sierra 10.13
https://developer.apple.com/library/content/technotes/tn2459/_index.html
When you download the Mac OSX CP210x VCP driver v5 from the Silicon Labs website, approve the CP210x driver by clicking "Allow" in the Security & Privacy System Preferences panel as TN2459 mentioned to complete the installation of the driver.
CP2615 with a codec without I2C
It is possible to use the CP2615 USB-to-Audio bridge with a codec that does not have an I2C interface. However, an incorrect configuration of the CP2615 can prevent correct operation.
Primarily of concern is that the CP2615, if it is programmed to send I2C data to the codec, will hang if no I2C device is present. This occurs because the CP2615 will retry any failed I2C transactions forever. To prevent this from occurring, clear all I2C Strings from the configuration of the CP2615.
Also make sure to disable [Enable Playback Mute via Register] to prevent the CP2615 from attempting to use I2C commands to mute the codec.
What is a Universal Windows Driver
Question
What is a Universal Windows Driver? Does Silicon Labs provide a Universal Windows Driver for CP210x?
Answer
A Universal Windows Driver is a single driver package that runs on all versions of Windows 10. Silicon Labs provides a Universal Windows Driver for CP210x. See VCP driver page: https://www.silabs.com/products/development-tools/software/usb-to-uart-bridge-vcp-drivers
How do I edit DacConfig using the CP2114 Xpress Configurator?
CP210x的串口可以设置哪些波特率？
CP2101/CP2102/CP2102N/CP2103/CP2104/CP2105/CP2108/CP2109默认仅支持特定的波特率。
CP2101最大921.6kbps，具体请参考datasheet。
CP2102/CP2109和CP2103最大1Mbps。具体请参考datasheet。
CP2102N最大3Mbps, 具体请参考datasheet。
CP2104的串口最大波特率2Mbps，波特率由48MHz系统主频分频而来，具体参考datasheet中的 Baud Rate Generation 章节。
CP2105的的standard串口最大波特率921.6kbps，而enhanced串口最大波特率2Mbps，波特率由48MHz系统主频分频而来，具体参考datasheet中的 Baud Rate Generation 章节。
CP2108的串口波特率最大2Mbps，波特率由系统主频80MHz分频而来，具体参考datasheet中的 Baud Rate Generation 章节。
CP2102/CP2103/CP2109可以设置波特率映射表，通过配置软件Xpress Configurator可以配置32个波特率。芯片将根据应用程序所请求的波特率所处的区间使用一个对应的频率，如下图示意：
具体参见AN721:
https://www.silabs.com/documents/public/application-notes/AN721.pdf
Difference between CP210x driver v10.1.1 and v6.7.5
At the outset, CP210x driver v10.1.1 is a Windows Universal driver. More information regarding this driver can be found in this KB Article - https://www.silabs.com/community/interface/knowledge-base.entry.html/2017/12/27/vcp_driver_-_windows-Ulur.
The CP210x driver v6.7.5 is now the "legacy" driver and can be used on Windows 7, 8 and 10. The differences between the two versions of the drivers can be explained in the following way -
1. Differences in the Driver Software
This has been captured by the release notes documentation which can be obtained from here - https://www.silabs.com/documents/public/release-notes/CP210x_Universal_Windows_Driver_ReleaseNotes.txt
2. Functional differences, i.e., why have v10.1.1?
The driver version v6.7.5 is for "Desktop" Editions of Windows 7 and later, i.e., Windows 7, 8, 8.1 and 10. Please note that these drivers are valid only for "Desktop" editions, i.e., PCs and servers. Windows v10.1.1 is a universal Windows driver. "Universal" was introduced by Microsoft in Windows 10. "Universal" means desktop plus embedded plus mobile, etc. editions of Windows that support Universal, i.e., Windows 10. For more information about Universal drivers, please refer to this article by Microsoft - https://docs.microsoft.com/en-us/windows-hardware/drivers/develop/getting-started-with-universal-drivers. This knowledge base article on our community forum has more information about universal drivers in general and driver v10.1.1 in particular - https://www.silabs.com/community/interface/knowledge-base.entry.html/2017/12/27/vcp_driver_-_windows-Ulur.
3. Serial Enumeration
Serial enumeration is enabled in v6.7.5 while v10.1.1 does not have serial enumeration enabled.
4. Legacy versus Current
Technically, the driver version v6.7.5 is almost a "legacy" driver. Windows and in turn Silicon Labs is planning to continue using only v10.1.1 and make edits (if necessary) to that version of the driver.
Please note that if you are running a desktop PC with Windows 10, you can use either v6.7.5 or v10.1.1 drivers on your system.
How do I setup CP2108 port config using python?
Question
How do I setup CP2108 port config using python?
Answer
1. Get CP210x manufacturing DLL from AN721
The AN721SW package contains a DLL file for accessing CP210x configuration. Here is the path of the Windows DLL:
AN721SW\Windows\CP210x_InterfaceLibrary\ManufacturingDLL\x86_64\CP210xManufacturing.dll
2. Load DLL file
Prepare a Python file named cp210x.py,
ctypes is a foreign function library for Python. It provides C compatible data types and allows calling functions in DLLs or shared libraries. It can be used to wrap these libraries in pure Python.
Load a shared library into the process and return it. This method always returns a new instance of the library.
3. Call functions inside the DLL
Some functions contain pointer parameters, like this one:
Python ctypes exports the byref() function, which is used to pass parameters by reference.
Here is the example:
For a CP2108 device, it outputs "Found 4 devices"
4. Get CP2108 port config
Two functions access CP2108 port config:
The parameter QUAD_PORT_CONFIG is a structure defined in CP210xManufaturingDLL.h.
In Python, structures and unions must derive from the structure and union base classes defined in the ctypes module.
Here are the definitions in Python:
Then, we can get the port config values and set one GPIO to be a clock output. Here is the example code:
On the board, we can see the LED DS3 is on. We can see clock signal by measuring the waveform on an oscilloscope.
5. Reference
Here is the Python official website for ctypes
https://docs.python.org/3.4/library/ctypes.html#structure-union-alignment-and-byte-order
虚拟串口CP210x系列功能有何差异？
问题：
虚拟串口CP210x系列功能有何差异？
答案：
虚拟串口产品的特点是：安装驱动程序后插入设备操作系统中可以看到一个虚拟的COM端口(虚拟意味着没有RS232接口的串口硬件，但是从软件角度可以与旧的RS232端口进行同样的通信）。常见的串口软件，比如“串口助手”,Windows自带的“超级终端”等软件可以直接打开
虚拟串口(VCP: Virtual COM Port)产品，包括的产品有：CP2101、CP2102、CP2103、CP2104、CP2105、CP2108、CP2109、CP2102N。这些产品使用共同的VCP驱动，在虚拟串口数量、通信速度、芯片引脚数量上有些差异。有如下几种类别：
1. USB转单串口:CP2101、CP2102、CP2103、CP2104、CP2109
一个芯片可以实现一个虚拟串口。其中：
CP2101是第一代产品，最大吞吐量欠佳、芯片体积大，已不推荐新产品使用。
CP2102是Flash产品，参数可以修改多次，芯片体积大。
CP2109是CP2102的OTP版本，成本较低。CP2102/CP2109 的IO不可以做通用的GPIO.
CP2103和CP2104类似，CP2103是基于flash的，CP2104是OTP版本，在体积和速度上有差异：
CP2103 波特率最大1Mbps，封装5x5mm QFN
CP2104 波特率最大2Mbps，封装4x4mm QFN
CP2102N是最新的基于flash的，成本较低。新的客户建议优先选用该系列。
2. USB转双串口：CP2105
一个芯片可以实现两个虚拟串口。芯片上的存储器是OTP，参数仅可以修改一次。
3. USB转四串口：CP2108
一个芯片可以实现四个虚拟串口。芯片上的存储器是Flash，参数可以多次修改。