CP2130 Datasheet, PDF (16/27 Pages) Silicon Laboratories – SINGLE-CHIP USB-TO-SPI BRIDGE

CP2130
5.4. GPIO.8—SPI Activity Indicator
GPIO.8 is configurable as a SPI activity indicator pin. This pin is logic high when a device is not transferring data
over the SPI, and toggles at a fixed rate as specified in Table 5 when a data transfer is in progress. Typically, this
pin is connected to an LED to indicate data transfer.
V_IO
CP2130
GPIO.8 – SPI Activity
Figure 10. SPI Activity Toggle Typical Connection Diagram
5.5. GPIO.9-10—SUSPEND and SUSPEND
GPIO.9 and GPIO.10 are configurable as active-high SUSPEND and active-low SUSPEND pins. The SUSPEND
pin is logic high when the device is in the suspended state and logic low when the device is in the active mode. The
SUSPEND pin has the opposite logic value of the SUSPEND pin.
5.6. USB Remote Wakeup
Any of the GPIO pins may be used to trigger a USB remote wakeup event. Before the CP2130 enters the Suspend
state, the device may be configured to wakeup on a port mismatch event. When any of the pins specified in the
wakeup mask do not match the pin logic value specified in the wakeup value, the CP2130 will wakeup and signal
remote wakeup on the bus. The CP2130 will assert USB remote wakeup signaling for 10 to 15 ms before the host
may respond by resuming the CP2130.
Any GPIO pin used for remote wakeup must be configured as an input during the Suspend state. GPIO pins are
selected as wakeup pins using the Wakeup Match Mask. The Wakeup Match Value specifies the logic level of the
wakeup pin. When the pin level does not match the value specified, the device will wakeup. The default Wakeup
Match Mask and Wakeup Match Value are shown in Table 15.
5.7. GPIO State During USB Suspend
All GPIO pins support programmable suspend state mode and latch values. When the CP2130 enter USB
Suspend mode and the Use Suspend Mode and Values option is set, the CP2130 will reconfigure the GPIO pins
just prior to entering USB Suspend mode. When the CP2130 resumes from USB Suspend mode, the GPIO pins
revert to the previous function configurations and modes.
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Rev. 0.7