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USB Hosts Hubs Transceivers

Anonymous
Not applicable

Hi , 

   I am using 28 pin CY7C65642 chip. I am using pin 26 (PWR#) for enabling my charge pump for USB power supply. But my pin 26 is not getting activated even though all my OVR# pins are as required.

Kindly let me know under what conditions PWR# will be active.  What is the use of TEST pin(18 pin).

Regards,

Nanda

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1 Solution
Anonymous
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Hi Nanda,

PWR#/I2C_SDA can be used as either PWR# or I2C_SDA but not as both in 28-pin QFN Package. If EEPROM is connected then the pin will act as I2C_SDA, it will not switch to PWR# mode (as it does in 48-pin TQFP package).

If EEPROM is not being used, PWR# is an active LOW pin (LOW when activated), which needs an external pull-up resistor.

TEST pin can be used for Test Mode by driving it HIGH. For Normal operation it is recommended to drive this pin LOW.

Regards,
Anil

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Anonymous
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Hi Nanda,

PWR#/I2C_SDA can be used as either PWR# or I2C_SDA but not as both in 28-pin QFN Package. If EEPROM is connected then the pin will act as I2C_SDA, it will not switch to PWR# mode (as it does in 48-pin TQFP package).

If EEPROM is not being used, PWR# is an active LOW pin (LOW when activated), which needs an external pull-up resistor.

TEST pin can be used for Test Mode by driving it HIGH. For Normal operation it is recommended to drive this pin LOW.

Regards,
Anil

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Anonymous
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Also, make sure  to connect PWR# to VCCD/+5V with 100kohm resistors, OVR# to the same power with 10Kohm. Because PWR# is open drain output and OVR# is open drain input.

For more details on test pin, please refer:

Connecting the TEST/I2C_SCL Pin of EZ-USB® HX2VL™ - KBA85448

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