Part: CP2102/9 — Silicon Laboratories

Type: Single-Chip USB to UART Bridge Controller

Description: Highly-integrated USB-to-UART bridge controller providing a simple solution for updating RS232 designs to USB, featuring a USB 2.0 full-speed function controller, USB transceiver, oscillator, EEPROM/EPROM, and asynchronous serial data bus (UART) with full modem control signals.

Operating Conditions:

• Supply voltage: 3.0 to 3.6 V (self-powered), 4.0 to 5.25 V (USB bus powered)
• Operating temperature: -40 to +85 °C
• UART baud rates: 300 bps to 1 Mbps

Absolute Maximum Ratings:

• Max supply voltage (VDD): 4.2 V
• Max total current through VDD and GND: 500 mA
• Max output current sunk by RST or any I/O pin: 100 mA
• Max ambient temperature under bias: 125 °C
• Max storage temperature: 150 °C

Key Specs:

• Supply Current - Normal (CP2102): 20 mA (typ)
• Supply Current - Suspended (CP2102): 80 μA (typ)
• UART Baud Rate: Up to 921600 bps (max)
• Input Leakage Current: 25 μA (typ)
• CP2102 Regulator Output Voltage: 3.3 V (typ, 1 to 100 mA output current)
• CP2109 Regulator Output Voltage: 3.45 V (typ, 1 to 100 mA output current)
• USB Output High Voltage: 2.8 V (min)
• USB Output Low Voltage: 0.8 V (max)

Features:

• Integrated USB transceiver; no external resistors required
• Internal 1024-byte programmable ROM for vendor ID, product ID, serial number, power descriptor, release number, and product description strings
• Integrated clock; no external crystal required
• On-chip power-on reset circuit
• On-chip voltage regulator (3.3 V for CP2102, 3.45 V for CP2109)
• USB Specification 2.0 compliant; full-speed (12 Mbps)
• All handshaking and modem interface signals
• 576 Byte receive buffer; 640 byte transmit buffer
• Hardware or X-On/X-Off handshaking supported
• Royalty-free Virtual COM Port (VCP) device drivers

Applications:

• Upgrade of RS-232 legacy devices to USB
• USB interface cable
• Cellular phone USB interface cable
• USB to RS-232 serial adapter

Package:

• 28-pin QFN (5x5 mm)

• -Upgrade of RS-232 legacy devices to USB
• -USB interface cable
• -Cellular phone USB interface cable
• -USB to RS-232 serial adapter

CP2102-GM QFN-28 Pinout

Notes

• CP2102-GM variant: Pin 18 is NC (No Connect) on CP2102; it is VPP on the CP2109 variant. For CP2102-GM, leave pin 18 unconnected or tie to VDD.
• UART and modem control pins (CTS, RTS, DSR, DTR, DCD, RI) can be left unconnected when not used.
• SUSPEND pins (11 and 12): Pin 11 is driven low and pin 12 is driven high during USB suspend state; they provide complementary outputs.
• NC pins (10, 13–22): Should be left unconnected or tied to VDD for board compatibility.
• Pin numbers and names verified against the QFN-28 pinout diagram (Figure 2).

Table 2. Absolute Maximum Ratings

Note: Stresses above those listed may cause permanent device damage. This is a stress rating only, and functional operation of the devices at or exceeding the conditions in the operation listings of this specification is not implied. Exposure to maximum rating conditions for extended periods may affect device reliability.

Table 2. Absolute Maximum Ratings

VDD = 3.0 to 3.6 V, -40 to +85 °C unless otherwise specified

1. The USB Pull-up supply current values are calculated values based on USB specifications. USB Pull-up supply current is current flowing from V DD to GND through USB pull-down/pull-up resistors on D+ and D-.
2. Thermal resistance assumes a multi-layer PCB with any exposed pad soldered to a PCB pad.
3. USB Pull-up current should be added for total supply current. Normal and suspended supply current is current flowing into V REGIN . Normal and suspended supply current is guaranteed by characterization.