USB5533B datasheet(11/71 Pages) MICROCHIP

11 / 71 page

 2012 - 2015 Microchip Technology Inc.

DS00001680C-page 11

USB5533B

Note 3-1

The PRT_PWR[3:1] pins can optionally provide additional configuration strap functions to

enable/disable the associated port and configure its battery charging capabilities. Configuration strap

values are latched on device reset. Table 3-2 details the functions associated with the various strap

settings.

Strapping features are enabled by default and can be optionally disabled via the Pro-Touch software

programming tool. For additional information on the Pro-Touch programming tool, contact your local

sales representative.

Strapping functions are not supported for designs that support OCS but not power switching.

Note 3-2

The SPI_DO pin provides an additional SPI_SPD_SEL configuration strap function. SPI_SPD_SEL

selects between the 30MHz SPI Mode when pulled-down to ground (default) and the 60MHz SPI

Mode when pulled-up to VDD33. The SPI_SPD_SEL strap value is latched on Power-On Reset

(POR) or RESET_N deassertion.

Note 3-3

The OCS[3:1] pins can optionally provide additional configuration strap functions. To set the

associated port into the non-removable state, the OCS pin must be configured with a pull-down

(<10 k

to VSS). Otherwise, the port will be configured in the removable state. Configuration strap

values are latched on device reset.

Strapping features are enabled by default and can be optionally disabled via the Pro-Touch software

programming tool. For additional information on the Pro-Touch programming tool, contact your local

sales representative.

Strapping functions are not supported for designs that support OCS but not power switching.

RBIAS

I-R

USB Transceiver Bias

A12.0 k

 (+/- 1%) resistor is attached from ground to this pin to set the

transceiver’s internal bias settings.

ATEST

Analog Test Pin

This signal is used for testing the chip and must always be connected

to ground.

SM_CLK

I/O12

SMBus Clock

SM_DAT

I/O12

SMBus Data Pin

(7) NC

No connect pins

DIGITAL AND POWER

(4) VDD33

3.3 V Power

(8) VDD12

1.25 V Power

VSS

Ground Pad

This exposed pad is the device’s only connection to VSS and the

primary thermal conduction path. Connect to an appropriate via field.

TABLE 3-2:

PRT_PWR[3:1] CONFIGURATION STRAP STATES

PRT_PWR[3:1]

Strap Setting

Port State

Battery Charging

No Pull-Up or Pull-Down

Enabled

Disabled

Pull-Down:

<10 k

to VSS

Disabled

N/A

Pull-Up:

<10 k

and >1 k to VDD33

Enabled

TABLE 3-1:

USB5533B PIN DESCRIPTIONS (CONTINUED)

Symbol

Buffer Type

Description

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