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[FAQ] Can less than three GPIs be used for PIN SELECTED RAIL STATE (PSRS)? UCD90xxx

Sam
Expert 4175 points
Other Parts Discussed in Thread: UCD90120A, UCD9090, UCD90160A, UCD90160, UCD90240, UCD90320U, UCD90120, UCD9090A, UCD90124, UCD90124A, UCD90320

Yes, PSRS supports up to three GPIs. When the number of GPIs used for PSRS is less that the configured GPIs, enable all supported states based on the number of configured GPIs and configure the state based on the number of GPIs for PSRS. For example, three GPIs are configured, but only the first GPI is used for PIN PSRS. You have to enable all eight states, configure all even states the same as state 0, and configure all odd states the same as state 1. Therefore, the changes on the second and third GPIs do not affect desired function.

For more FAQ please check the following document.

UCD90xxx Family Frequently Asked Questions and Answers 

UCD9090 UCD9090A UCD90120 UCD90120A UCD90124 UCD90124A UCD90160 UCD90160A UCD90240 UCD90320 UCD90320U