Hello
About Cypress's EZ-PD CY4533 (CYPD7133).
Q1) Please tell me the DC characteristics of VBUS_FET_EN.
>VBUS_FET_EN pin Behavior
>The VBUS_FET_EN pin is a PFET gate driver that drives to either 0 V or VBUS_IN depending on the state of the Type-C >connection.Contact Cypress Technical Support for more details on how to use this pin for specific applications.
>
In the data sheet Page9 of CYPD7133, it is described as above.
Therefore, when measuring the voltage on the VBUS_FET_EN pin and the FET gate side of R16 with CY4533KIT, the following measurement results were obtained.
SEL R16 (FET gate side) VBUS_FET_EN
5V 1.1V 0.6V
9V 2V 1.1V
12V 2.6V 1.4V
15V 5V 2.8V
20V 10V 5.7V
Q2)As a result mentioned above, it seems that the VBUS_FET_EN is not 0V or VBUS_IN voltage,
Could you please tell me the reaon on this.
Q3)
Please let me know if there is a logic (Hi, Low) signal line other than VBUS_FET_EN when the USB-PD obtains an effective voltage.
Hi Macnica,
We don't have the DC characteris value but the internal structure of VBUS_FET_EN is just like the VBUS_P_CTRL of CCG3PA:
The internal MOS has its own Rds(on) which cause the VBUS_FET_EN is not exactly 0V or VBUS_IN voltage.
And CYPD3177 do not have other pins to display whether a PD contract is estbalished. If you want custmized usage of GPIO, you should switch to CCG3PA instead of BCR since it is a fixed-firmware part.
Regards,
Eddie
Hi Macnica,
We don't have the DC characteris value but the internal structure of VBUS_FET_EN is just like the VBUS_P_CTRL of CCG3PA:
The internal MOS has its own Rds(on) which cause the VBUS_FET_EN is not exactly 0V or VBUS_IN voltage.
And CYPD3177 do not have other pins to display whether a PD contract is estbalished. If you want custmized usage of GPIO, you should switch to CCG3PA instead of BCR since it is a fixed-firmware part.
Regards,
Eddie
