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CP2102 Datasheet(PDF) 11 Page - Silicon Laboratories |
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CP2102 Datasheet(HTML) 11 Page - Silicon Laboratories |
11 / 18 page CP2102 Rev. 1.2 11 5. USB Function Controller and Transceiver The Universal Serial Bus function controller in the CP2102 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 CP2102 device as well as external circuitry. The CP2102 will enter Suspend mode when Suspend signaling is detected on the bus. On entering Suspend mode, the CP2102 asserts the SUSPEND and SUSPEND signals. SUSPEND and SUSPEND are also asserted after a CP2102 reset until device configuration during USB Enumeration is complete. The CP2102 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 SUSPEND signals are de-asserted. Both SUSPEND and SUSPEND temporarily float high during a CP2102 reset. If this behavior is undesirable, a strong pulldown (10 k Ω) can be used to ensure SUSPEND remains low during reset. See Figure 6 for other recommended options. Figure 6. Typical Connection Diagram Option 1: A 4.7 k Ω pull-up resistor can be added to increase noise immunity. Option 2: A 4.7 µF capacitor can be added if powering other devices from the on-chip regulator. Option 3: Avalanche transient voltage suppression diodes should be added for ESD protection. Option 3: Use Littlefuse p/n SP0503BAHT or equivalent. Option 4: 10 k Ω resistor to ground to hold SUSPEND low on initial power on or device reset. 1 CP2102 SUSPEND SUSPEND 11 12 REGIN 7 GND 3 RST 9 D+ 4 D- 5 8 C2 0.1 µF C1 1 µF RI DCD CTS RTS RXD TXD DSR DTR 2 1 28 27 26 25 24 23 2 3 External RS-232 transceiver or UART circuitry (to external circuitry for USB suspend states) VBUS D- D+ GND 4 USB CONNECTOR 6 VDD VBUS VDD R1 4.7 k Ω D1 D2 D3 Option 1 R2 10 k Ω Option 4 Option 3 C4 4.7 µF Option 2 |
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