USB2517 datasheet(24/58 Pages) MICROCHIP

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USB2517/USB2517I

DS00001598B-page 24

 2013-2016 Microchip Technology Inc.

7.2.1.8

2:1

CURRENT_SNS

Over-current Sense: Selects current sensing on a port-by-port basis, all ports

ganged, or none (only for bus-powered hubs). The ability to support current

sensing on a port or ganged basis is hardware implementation dependent.

00 = Ganged sensing (all ports together)

01 = Individual port-by-port

1x = Over-current sensing not supported (must only be used with Bus-Pow-

ered configurations!)

PORT_PWR

Port Power Switching: Enables power switching on all ports simultaneously

(ganged), or port power is individually switched on and off on a port- by-port

basis (individual). The ability to support power enabling on a port or ganged

basis is hardware implementation dependent.

0 = Ganged switching (all ports together)

1 = Individual port-by-port switching

Bit

Number

Bit Name

Description

DYNAMIC

Dynamic Power Enable: Controls the ability of the Hub to automatically

change from Self-Powered operation to Bus-Powered operation if the local

power source is removed or is unavailable (and from Bus-Powered to Self-

Powered if the local power source is restored). {Note: If the local power

source is available, the Hub will always switch to Self-Powered operation.}

When Dynamic Power switching is enabled, the Hub detects the availability of

a local power source by monitoring the external LOCAL_PWR pin. If the Hub

detects a change in power source availability, the Hub immediately discon-

nects and removes power from all downstream devices and disconnects the

upstream port. The Hub will then re-attach to the upstream port as either a

Bus-Powered Hub (if local-power is unavailable) or a Self-Powered Hub (if

local power is available).

0 = No Dynamic auto-switching

1 = Dynamic Auto-switching capable

Reserved

5:4

OC_TIMER

Over-Current Timer: Over-Current Timer delay.

00 = 0.1ms

01 = 4ms

10 = 8ms

11 = 16ms

Bit

Number

Bit Name

Description

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