USB2532 datasheet(17/50 Pages) MICROCHIP

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USB 2.0 Hi-Speed 2-Port Hub Controller

Datasheet

 2014 Microchip Technology Inc.

DS00001701A-page 17

Note 3.2

The LOCAL_PWR pin is sampled during the configuration state, immediately after negation

of reset, to determine whether the device is bus-powered or self-powered. When

configuration is complete, the latched value will not change until the next reset assertion.

To enable dynamic local power switching, the DYNAMIC_POWER register at location

0x4134 must be programmed with 0x41. If dynamic power switching is not required, the

DYNAMIC_POWER register should be left at the default value of 0xC1. Programming may

be performed through the SMBus interface, or permanently via OTP. Refer to the Protouch

MPT User Manual for additional information.

Note 3.3

If using the local power detect function (LOCAL_PWR pin), the NON_REM[1:0]

configuration straps cannot be used to configure the non-removable state of the USB ports.

In this case, the non-removable state of the ports must be configured in internal device

registers via the Protouch tool or SMBus.

Note 3.4

Configuration strap values are latched on Power-On Reset (POR) and the rising edge of

RESET_N (external chip reset). Configuration straps are identified by an underlined

symbol name. Signals that function as configuration straps must be augmented with an

external resistor when connected to a load. Refer to Section 6.3, "Device Configuration

Straps," on page 27 for additional information.

+1.2V Core

Power Supply

VDDCR12

+1.2V core power supply. A 1.0

μF (<1

Ω ESR)

capacitor to ground is required for regulator

stability. The capacitor should be placed as close

as possible to the device. Refer to Chapter 4,

"Power Connections," on page 20 for power

connection information.

Exposed

Pad on

package

bottom

(Figure 3.1)

Ground

VSS

Common ground. This exposed pad must be

connected to the ground plane with a via array.

Table 3.1 Pin Descriptions (continued)

NUM PINS

NAME

SYMBOL

BUFFER

TYPE

DESCRIPTION

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