CP2102 chip from SiLabs is a single-chip USB to UART bridge IC. This cp2102  USB to serial requires minimal external components.CP2102 can be used to migrate legacy serial port based devices to USB.

Documents:

• Driver

Features:

1. Stable and reliable chipset CP2102.
2. USB specification 2.0 compliant with full-speed 12Mbps.
3. Standard USB type A male and TTL 6pin connector.
4. 6pins for 3.3V, RST, TXD, RXD, GND & 5V.
5. Baud rates: 300 bps to 1.5 Mbps
6. Byte receive buffer; 640 byte transmit buffer.
7. Hardware or X-On/X-Off handshaking supported.
8. Event character support Line break transmission.
9. USB suspend states supported via SUSPEND pins.
10. Temperature Range: -40 to +85.
11. Size: 42mm X 15mm.
12. Weight: 4g

Pinouts:

1. TX = Connect to Transmit Pin(TXD) of Micro controller. This pin is RX pin of CP2102 on board.
2. RX = Connect to Receive Pin(RXD) of Micro controller. This pin is TX pin of CP2102 on board.
3. RST = Normally Unconnected. Reset Pin for CP2102. Initiate a system reset by driving this pin low for atleast 15 µs.
4. GND = Should be common to microcontroller ground.
5. 3V3 = Optional output to power external circuit upto 50mA.
6. 5V = Optional output to power external circuit upto 100mA