CP2101 Datasheet, PDF (11/14 Pages) List of Unclassifed Manufacturers – Single-Chip USB to UART Bridge

Preliminary
CP2101
5. USB FUNCTION CONTROLLER AND TRANSCEIVER
The Universal Serial Bus function controller in the CP2101 is a USB 2.0 compliant full-speed device with integrated
transceiver and on-chip matching and pull-up resistors. The USB function controller manages all data transfers
between the USB and the UART as well as command requests generated by the USB host controller and commands
for controlling the function of the UART.
The USB Suspend and Resume signals are supported for power management of both the CP2101 device as well as
external circuitry. The CP2101 will enter Suspend mode when Suspend signaling is detected on the bus. On entering
Suspend mode, the CP2101 asserts the SUSPEND and /SUSPEND signals. SUSPEND and /SUSPEND are also
asserted after a CP2101 reset until device configuration during USB Enumeration is complete
The CP2101 exits the Suspend mode when any of the following occur: (1) Resume signaling is detected or generated,
(2) a USB Reset signal is detected, or (3) a device reset occurs. On exit of Suspend mode, the SUSPEND and /SUS-
PEND signals are de-asserted. Note: both SUSPEND and /SUSPEND temporarily float high during a CP2101 reset. If
this behavior is undesirable, a strong pull-down (10K ohms) can be used to ensure /SUSPEND remains low during reset.
6. ASYNCHRONOUS SERIAL DATA BUS (UART) INTERFACE
The CP2101 UART interface consists of the TX (transmit) and RX (receive) data signals as well as the RTS, CTS,
DSR, DTR, DCD and RI control signals. The UART supports RTS/CTS, DSR/DTR and X-On/X-Off handshaking.
The UART is programmable to support a variety of data formats and baud rates. The data format and baud rate pro-
grammed into the UART is set during COM port configuration on the PC. The data formats and baud rates available
are listed in Table 6.1.
Data Bits
Stop Bits
Parity Type
Baud Rates
Table 6.1. Data Formats and Baud Rates
8
1
None, Even, Odd
300, 600, 1200, 1800, 2400, 4800, 7200, 9600, 14400, 19200, 28800,
38400, 56000, 57600, 115200, 128000, 230400, 460800, 921600
© 2003 Cygnal Integrated Products, Inc. DS014-1.0 AUG03
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