CP2101R

Product Overview

• Category: Integrated Circuit
• Use: USB to UART Bridge Controller
• Characteristics: High-performance, low-power, small form factor
• Package: QFN-28
• Essence: Enables communication between a USB host and UART devices
• Packaging/Quantity: Tape and Reel, 2500 units per reel

Specifications

• Operating Voltage: 3.0V - 5.25V
• UART Interface: Supports full-duplex asynchronous serial communication
• USB Interface: USB 2.0 compliant, supports full-speed (12 Mbps) and low-speed (1.5 Mbps) data transfer rates
• GPIO Pins: 4 general-purpose I/O pins
• Operating Temperature: -40°C to +85°C

Pin Configuration

The CP2101R has a total of 28 pins. The pin configuration is as follows:

1. VDD - Power supply voltage
2. GND - Ground
3. D+ - USB data line
4. D- - USB data line
5. TXD - UART transmit data
6. RXD - UART receive data
7. RTS - UART request to send
8. CTS - UART clear to send
9. GPIO0 - General-purpose I/O pin
10. GPIO1 - General-purpose I/O pin
11. GPIO2 - General-purpose I/O pin
12. GPIO3 - General-purpose I/O pin
13. SUSPEND - USB suspend indicator
14. RI - Ring indicator
15. DCD - Data carrier detect
16. DSR - Data set ready
17. DTR - Data terminal ready
18. RTS# - UART request to send (active-low)
19. CTS# - UART clear to send (active-low)
20. VBUS - USB bus voltage
21. ID - USB identification pin
22. OSC1 - Oscillator input
23. OSC2 - Oscillator output
24. XIN - External crystal oscillator input
25. XOUT - External crystal oscillator output
26. RESET# - Device reset (active-low)
27. SUSPEND# - USB suspend indicator (active-low)
28. GND - Ground

Functional Features

• USB to UART bridge conversion
• Supports multiple baud rates and data formats
• Automatic flow control using RTS/CTS or XON/XOFF
• On-chip voltage regulator for 3.3V output
• Integrated USB termination resistors
• Low power consumption in suspend mode
• Configurable GPIO pins for additional functionality

Advantages and Disadvantages

Advantages: - High-performance USB to UART communication - Small form factor for space-constrained applications - Wide operating voltage range - Support for various data formats and baud rates - Integrated voltage regulator simplifies power supply design

Disadvantages: - Limited number of GPIO pins - Requires external crystal oscillator for accurate timing

Working Principles

The CP2101R acts as a bridge between a USB host and UART devices. It converts USB data packets into UART serial data and vice versa. The device is controlled through the UART interface, allowing bidirectional communication with the connected UART devices. The integrated USB termination resistors and voltage regulator simplify the design and reduce external component count.

Application Field Plans

The CP2101R finds applications in various fields, including but not limited to:

1. Embedded Systems: Enables USB connectivity for microcontrollers and embedded systems.
2. Industrial Automation: Facilitates communication between USB-enabled devices and industrial equipment.
3. Internet of Things (IoT): Integrates USB-to-UART functionality in IoT devices for data transfer.
4. Consumer Electronics: Provides USB connectivity for devices such as smart home appliances, gaming consoles, etc.
5. Medical Devices: Enables USB communication in medical equipment and diagnostic devices.

Alternative Models

1. CP2102N: Similar functionality with additional features like battery charger detection and I2C interface.
2. FT232R: USB to UART bridge controller with a different pin configuration and feature set.
3. PL2303HXD: USB to UART TTL converter with a compact form factor and support for multiple operating systems.

These alternative models offer similar USB to UART conversion capabilities but may have different pin configurations, package options, or additional features based on specific requirements.

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