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3pcs CP2102 USB to TTL Serial Adapter Downloader Module, 3.3 V 5 V Output, USB 2.0 Full SpeedProduct Overview
Product Overview
NH‑CP2102 USB to TTL downloader module based on CP2102 chipset. Converts USB to UART COM port for programming and debugging microcontrollers such as for STC89C52 and for Pro Mini. Compact size with onboard protection and dual voltage output
1. Electrical And Mechanical Specifications
Chipset: CP2102 USB‑to‑UART Bridge
USB Standard: USB 2.0 Full Speed
UART Interface: TXD, RXD, RTS, CTS, DTR, DSR, DCD, RI
Logic Levels: 3.3 V and 5 V selectable output
Power Output: 3.3 V regulated; 5 V from USB
Current Protection: Resettable fuse
PCB Size: 26.5 mm × 15.6 mm
Indicators: Power LED; RX LED; TX LED
Operating Systems: Windows 98 to Windows 7; Windows CE; macOS 9; macOS X; Linux 2.4.0 and above
Data Buffer: 512‑byte RX; 512‑byte TX
2. Main Pin Functions
5V: 5 V power output from USB
3V3: 3.3 V regulated output
GND: Ground
TXD: UART transmit data output
RXD: UART receive data input
DTR: Data terminal ready; supports auto reset
RST: Reset signal output
RTS CTS: Hardware flow control signals
3. Common Questions And Answers
Q1: Does this module need external USB components
A: No, CP2102 integrates USB transceiver, clock, EEPROM, and voltage regulator
Q2: Is it compatible for Arduino or for Pro Mini
A: Yes, it works as a USB to TTL adapter for for Arduino Pro Mini and UART boards
Q3: Can it output both 3.3 V and 5 V
A: Yes, onboard regulator provides 3.3 V and USB supplies 5 V
Q4: Is driver installation required
A: Yes, CP2102 driver is required to create a virtual COM port on the PC
Q5: Is short‑circuit protection included
A: Yes, a resettable fuse protects the module and the USB port during faults
Key Features
- 【CP2102 USB To UART Core Architecture】 CP2102 USB to TTL downloader module; USB 2.0 full‑speed interface; integrated USB controller, transceiver, oscillator, EEPROM, and UART; converts USB to stable virtual COM port; designed for reliable programming and serial debugging of microcontroller boards
- 【Dual Logic Level And Power Output Support】 Supports 3.3 V and 5 V TTL logic levels; onboard 3.3 V regulated output plus direct 5 V power from USB; enables direct connection to low‑voltage and standard‑voltage targets; reduces external power wiring during development and testing
- 【Compact PCB With Electrical Protection】 Small PCB size 26.5 mm by 15.6 mm; lightweight layout suited for breadboards and enclosures; built‑in resettable fuse provides short‑circuit protection for both module and computer USB port; improves reliability during frequent plug and wiring changes
- 【Clear Status Indication And Full Pin Access】 Power, RX, and TX LEDs show real‑time operating and data transfer status; all essential pins exposed including TXD, RXD, DTR, RTS, CTS, and reset; simplifies wiring, supports auto reset, and helps reduce common connection errors
- 【Broad System And Board Compatibility】 Compatible with Windows, macOS, Linux, and Windows CE with driver installation; works with for STC89C52 and for Arduino Pro Mini using reset output; supports hardware and X‑ON X‑OFF flow control; TTL signals only, not for RS232 voltage levels
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