2.5.14. GPIO-B Pins During Power Sequencing
Adhere to the these guidelines to prevent unnecessary current draw on the I/O pins located in the GPIO-B banks. These guidelines apply for unpowered, power up to power-on reset (POR), POR delay, POR delay to configuration, configuration, initialization, user mode, and power down device states.
- The I/O pins in the GPIO-B banks can be tri-stated, driven to ground, or driven to the VCCIO_PIO level.
- While the device is powering up or down:
- The input signals of an I/O pin, at all times, must not exceed the I/O buffer power supply rail of the bank where the I/O pin resides.
- If you use a pin in a GPIO-B bank with 1.3 V VCCIO_PIO, the pin voltage must not exceed the VCCIO_PIO rail or 1.2 V, whichever is lower.
- While the device is powering up or powering down, the GPIO-B pins can tolerate a maximum of 10 mA per pin and a total of 100 mA per GPIO-B bank.
- While the device is not turned on, tri-state the I/O pin and do not drive the pin with any external voltage.
- After the device fully powers up, the voltage levels for the GPIO-B pins must not exceed the DC input voltage (VI) value.
|The VCCIO_PIO pin ramps up and at period X, the VCCIO_PIO voltage is 1.1 V.||At period X, keep the signals driven by the device connected to the GPIO-B I/O pin at a voltage of 1.1 V or lower.|
|The 1.3 V VCCIO_PIO pin ramps up and the voltage continues to rise pass the 1.2 V level.||Keep the GPIO-B pin voltage at 1.2 V or lower until the device fully powers up.|