USB5816CSLASHKD datasheet(36/66 Pages) MICROCHIP

36 / 66 page

USB5816C

DS00003186C-page 36

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2022 Microchip Technology Inc. and its subsidiaries

When the port is enabled, the

PRT_CTLx pin input is constantly sampled. Overcurrent events can be detected in one

of two ways:

• Single, continuous low pulse (consecutive low samples over tocs_single), as shown in Figure 8-7.

• Two short low pulses within a rolling window (two groupings of 1 or more low samples over tocs_double), as shown

in Figure 8-8.

To maximize compatibility with various port power control topologies, the parameters tocs_single and tocs_double are con-

figurable via the Overcurrent Minimum Pulse Width Register and Overcurrent Inactive Timer Register.

The pin also has a turn-on “lockout” feature where the state of the pin is ignored for a configured amount of time imme-

diately after port power is turned on. This prevents slow ramp times due to parasitic resistance/capacitance attached to

the pin from triggering false overcurrent detections. This parameter is configurable via the Overcurrent Lockout Timer

FIGURE 8-6:

PORT POWER CONTROL WITH USB POWER SWITCH

FIGURE 8-7:

SINGLE LOW PULSE OVERCURRENT DETECTION

FIGURE 8-8:

DOUBLE LOW PULSE OVERCURRENT DETECTION

USB Power

Switch

50k

PRTPWR

OCS

Pull‐Up Enable

USB

Device

FILTER

PRT_CTLx

IS VIL

tocs_single

PRT_CTLx

IS VIL

tocs_double

USB5816C/KD Datasheet(PDF) 36 Page - Microchip Technology