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PSoC 5, 3 & 1 MCU

guag_1662311
New Contributor II

I am using a CY8C5488AXI-LP120. When setting up the USBFS component, for the Vusb detection the datasheet says: For a PSoC 3/PSoC 5LP device, the VBUS monitoring pin can be directly connected to VBUS, if it is assigned to an SIO port. This configuration utilizes the hot swap capabilities of these pins. Question: with the psoc powered by 3.3V, can it be directly connected to the Vusb (5V) provided that an SIO pin is used?

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AnkitaS_51
Employee

I think this Forum thread discusses the same:

http://www.cypress.com/comment/140171

Please check page#11 of this AN:

http://www.cypress.com/file/44516/download

It says:

The SIO pins are tolerant to input voltages higher than the I/O supply voltage. The hot swap feature prevents input from being clamped to the I/O supply level, when the input voltage is above the I/O supply voltage. Each SIO pin can tolerate any input voltage up to 5 V, regardless of I/O supply voltage. In cases where the input voltage exceeds I/O supply voltage, the DC input leakage current is < 100 µA. This feature allows the SIO to be connected to an external bus that can be switched to voltage levels higher than the I/O supply voltage

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AnkitaS_51
Employee

I think this Forum thread discusses the same:

http://www.cypress.com/comment/140171

Please check page#11 of this AN:

http://www.cypress.com/file/44516/download

It says:

The SIO pins are tolerant to input voltages higher than the I/O supply voltage. The hot swap feature prevents input from being clamped to the I/O supply level, when the input voltage is above the I/O supply voltage. Each SIO pin can tolerate any input voltage up to 5 V, regardless of I/O supply voltage. In cases where the input voltage exceeds I/O supply voltage, the DC input leakage current is < 100 µA. This feature allows the SIO to be connected to an external bus that can be switched to voltage levels higher than the I/O supply voltage

View solution in original post

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