Questions tagged [cp2102]

The CP2102 is a highly-integrated USB-to-UART Bridge Controller providing a simple solution for updating RS-232 designs to USB using a minimum of components and PCB space.

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COM Port not Detected on Windows for CP2102 on Custom PCB

I am using CP2102N-A02-GQFN24 on my custom PCB to program my ESP32 board. I am not able to see any COM port on my Windows 10 PC. I can connect to an off the shelf CP2102N-A02-GQFN28 USB UART bridge ...
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Can DTR be replaced with GPIO0 in this USB to UART auto-program circuit?

These auto-program circuits have been popular for a long time. They replace the need to press boot and reset physically to put the MCU into programming mode. Some USB to UART converters do not have a ...
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Serial TX and RX requirements

I am building a custom ESP32 PCB. What do I need to take into account to route the serial tracks (Rx Tx)? Are they differential pairs? Can they be routed under an SMD resistor? Is 0.250mm (9.8 mil) ...
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2 votes
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Why does the ESP32 DevKit has a green box?

I am trying to copy the ESP32 DevKit behavior in my own PCB (my pcb project). I want that the ESP is powered from USB when plugged (for programming purpose only), but then powered by my external PSU ...
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3 votes
2 answers
518 views

Why does ESP DevKit have 0Ω resistors for the TX and RX?

I am trying to build my own ESP32 based PCB. I tried to copy the USB-to-serial circuit from the official DevKit. There I see two 0Ω resistors. Why did they add them? What do they do? USB to Serial ...
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How to utilize USB-Type-C connector as a normal connector?

I designed two custom PCB boards with one acting as my main Sensor Board and having a Controller (ESP32) interfacing all the sensors and peripherals. The other board is a programmer board that houses ...
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Problem with digital isolator and ESP32

I'm working in a proyect that requires that all external connections (in my case, everything related to the USB) to be isolated from the rest of the circuit. I came up with this circuit using the ...
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1 answer
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ESP32 custom board not receiving code

I'm trying to program one ESP32 custom board with a CP2102 USB, I followed the schematic of the official datasheet but when I try to upload my code the board doesn't recieve the code but the TX led ...
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Issues with CP2102 USB bus-powered and esp8266

I currently have some problems getting the cp2102 and esp8266 to work together on my board and was wondering if some of you can spot the problem or have some hints for me. The issue is, that I'm not ...
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STM32F103VCT6 Custom board not working

I made a custom board using STM32F103VCT6 MCU as shown in the attached schematic below. I soldered all the components as per the schematic and powered it on. The board worked for sometime and stopped ...
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4 answers
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CP2102 bypass capacitors

I'm using planning to use CP2102 as an USB/UART transceiver. Datasheet (can be found here: https://www.silabs.com/documents/public/data-sheets/CP2102-9.pdf) on page 21 shows example of self-powered ...
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Supplying power to ESP32 from a DC adapter instead of the USB port...is it a bad idea?

I'm designing this board based on ESP32 which suppose to handle two motor drivers (DRV8874, DRV8840) and a few other modules; a 12V@3A DC adapter seems to suffice powering-up the board according to my ...
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1 answer
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CP2102 USB pull-up current consumption

I'm not sure, what the current consumption of the CP2102 is, when no USB is connected. In the datasheet it states: https://www.mouser.de/datasheet/2/368/cp2102n_datasheet-1634912.pdf And there is ...
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-1 votes
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STM32F4xx with CP2102N - CP2102N not recognized by the PC

The CP2102 was connected to the STM32 GPIO pins while USART1 was not configured (STM32 clean / not programmed). Is it possible that I destroyed my CP2102N via the GPIOs of the STM32 in that "...
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Weird problem with usb2422 and CP2108

I've have a system consisting of a Raspberry Pi Zero W, a usb2422 USB-hub, a CP2108 Uart-to-USB converter as well as another USB device (lets call it device 2, it doesn't matter which one I plug in). ...
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Reset circuit of CP2102N and Atmega328P

I am working on a project where I want to programm the atmega via usb serial connection, just like an arduino. In order to do that, I have wired up both chips as the documentation suggests. The reset ...
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1 answer
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Silicon Labs CP2102 usb recognition error

Good Morning everyone, I have recently designed a circuitry design for the named chip "CP2102N-A02-GQFN24". Problems appear after connecting the chip to the computer. It doesn't get ...
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Use CP2102 as self-powered or bus-powered

I'm drawing a LiPo 3.7V charger circuit. This circuit contains a power path to continue delivering power to the circuit, or by battery or usb. In the final of the circuit I've an LDO to 3v3. Now, I ...
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1 vote
1 answer
84 views

Frame Errors (Character Stretching) of CP2102N

When I send a data stream from my PC to a CP2102 USB-to-Serial Bridge, the data coming out of the RS232 side is sometimes corrupted. The receiving micro (an ATmega2560) reports frame errors when this ...
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Custom STM8L dev board not working

I designed a dev board for the STM8L151F2, and even using an external programmer and external power the STM8 has only been able to be programmed twice. Here's the schematic, everything done in eagle. ...
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4 votes
5 answers
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ESP32 Dev Board DTR/RTS

I recently got an ESP32 development board. I also found the schematic to this board online but I got an question. Can someone explain to me, what this part of the circuit is doing? Schematic: https://...
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Do I need external pull up resistors for TX and RX lines in CP2102N?

I want to use it to program a microcontroller and this is the recommended set up from the data sheet. I was wonder If I need these resistors or not. I am not asking if STM32 chips require pull ups. ...
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681 views

Connect to a serial output device with 12V power input with 5V USB-TO-UART

I have DG600F coin acceptor with 12V power input and serial port output CP2102 usb-uart bridge and FDTI TTL-232RG cabel as an alternative A PC and Macbook as alternative I need to connect DG600F to ...
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2 answers
4k views

ESP-WROOM-32 layout USB-UART

I want my layout will include female headers to connect CP2102 MICRO USB to UART TTL Module 6Pin so I could just 'stick' it to my PCB while uploading the code. The 5V for the ESP will be supply from ...
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CP2102N Short Between D+ and D-

I am measuring a short between the D+ and D- lines between the USB micro connector and USB to UART chip (CP2102N). However by looking at the photos, there doesn't appear to be a short. Should I assume ...
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5V USB and 110VAC proper procedure?

My apologies in advance if this has already been asked I have a MCU (esp8266 or esp32) which will primarily live off mains power with transformer 110VAC -> DC 3.3V Occasionally USB is plugged into ...
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USART not working with CP2102 adapter and STM32F1 Blue Pill board

Having programmed 8-bit AVR MCU's, I bought Blue Pill STM32F103C8 dev board from ebay. It has 8MHz external crystal and I program it with ST-Link on Mac. I saw a lot of options like HAL, etc, but I ...
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2 answers
5k views

Upgrading firmware of SIM800C

My SIM800C, feeded directly from a 4.0V Li-ion battery (or once, from a Delta bench PSU) through a 1500 µF capacitor, instantly turns off when it wants to join to my 2G+ European network (e.g. in <...
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Issue in CP2102 Breakout module interface with PIC16F877a microcontroller

How to make pin connection between PIC16F877a and CP2102 Breakout module? below is what i am using now with many pins(confusing). what are the pins should connect with the PIC microcontroller for ...
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349 views

WiFi ESP8266 ESP-07 adapter role

I'm confused about the role of the Let's assume that I want to use it along with a and I want to flash it with . The adapter should be used with both CP2102 and the relay or just with the relay?...
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CP2108 with level converter txb0108 - UART communication TTL and LVTTL

My project uses four different modems (one 3v3 LVTTL(?) and three 5v TTL) for AT communication. Each modem has a UART interface (TTL compatible). For my application, i chose the CP2108 to ...
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1 answer
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Flashing Hex File to AT89C51

I have a USB to Serial breakout which has CP2102 and MAX232 chips on it. I wrote a program in Keil and generated the Hex File. How do I flash this hex file onto the AT89C51 (which is also another ...
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1 vote
1 answer
388 views

May I connect two voltage sources together if they are aprox. the same voltage? (CP2102)

I am making a circuit in which I have two voltage sources of 3.3V: - First is AMS1117-3.3V voltage regulator. According to datasheet, its output voltage is typical 3.3V, but could be as low as 3.2V ...
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1 vote
1 answer
1k views

How to connect with and use a USART to USB converter (CP2102 by Silabs)?

I figured since this is a very specific problem with a hardware device that many on SuperUser might not be familiar with, I would try posting here. I searched around on the net a bit and found a ...
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2 votes
1 answer
2k views

How does the Arduino do serial communication with a PC?

I am trying to develop a program such that I am able to communicate over USB to a PC. I have developed a usart library that I can use for such a purpose, but the problem in-lies with the conversion to ...
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