10 Power Supply Recommendations

On power up, the interaction of the RSTN pin and power on ramp could result in digital circuits not being set

correctly. The device should not be enabled until the power on ramp has settled to minimum recommended

supply voltage or higher to ensure a correct power on reset of the digital circuitry. If RSTN cannot be held low by

microcontroller or other circuitry until the power on ramp has settled, then an external capacitor from the RSTN

pin to GND is required to hold the device in the low power reset state.

internal pullup resistance of 500 kΩ, the recommended minimum external capacitance is calculated as:

[Ramp Time x 5] ÷ [500 kΩ]

(1)

TUSB217A

SLLSFK5 – JUNE 2021

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