USB4715 datasheet(10/47 Pages) MICROCHIP

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USB4715

DS00002514B-page 10



2022 Microchip Technology Inc. and its subsidiaries

SPI Chip

Enable

SPI_CE_EN

I/O4

Active low SPI chip enable input. If the SPI interface is

enabled, this pin must be driven high in powerdown

states.

Note:

If SPI interface is not utilized, this pin cannot

be left floating. It must be connected per the

CFG_NON_REM pin description.

SQI Interface Pins

SQI Clock

SQI_CLK

I/O4

SQI clock.

SQI Data 0-3

SQI_D[0:3]

I/O4

SQI Data 0-3. If the SQI interface is enabled, these sig-

nals function as Data 0 through 3.

SQI Chip

Enable

SQI_CE_EN

I/O4

Active low SQI chip enable input. If the SQI interface is

enabled, this pin requires an external pull-up resistor.

Note:

If SQI interface is not utilized, this pin cannot

be left floating. It must be connected per the

CFG_NON_REM pin description.

Miscellaneous

Programmable

Functions 8-1

PROG_FUNC[8:1]

I/O12

These selectable function pins can be assigned a role

via the

CONFIG_STRAP_[2:1] pins, OTP configuration,

or SMBus configuration. Refer to Section 3.3.4,

"PROG_FUNC[8:1] Configuration (CON-

FIG_STRAP_[2:1])" for additional information.

VBUS

Detection

VBUS_DET

This signal detects the state of the upstream bus power.

When designing a detachable hub, this pin must be con-

nected to the VBUS power pin of the upstream USB port

through a resistor divider (50 k

Ω by 100 kΩ) to provide

3.3 V.

For self-powered applications with a permanently

attached host, this pin must be connected to either 3.3 V

or 5.0 V through a resistor divider to provide 3.3 V.

In embedded applications,

VBUS_DET may be con-

trolled (toggled) when the host desires to renegotiate a

connection without requiring a full reset of the device.

Reset Input

RESET_N

This active low signal is used by the system to reset the

device. The active low pulse should be at least 1 s

wide.

Bias Resistor

RBIAS

I-R

A 12.0 k 1.0% resistor is attached from ground to this

pin to set the transceiver’s internal bias settings. Place

the resistor as close to the device as possible with a

dedicated, low impedance connection to the GND plane.

External 25 MHz

Crystal Input

XTALI

ICLK

External 25 MHz crystal input.

TABLE 3-2:

PIN DESCRIPTIONS (CONTINUED)

Name

Symbol

Buffer

Type

Description

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