USB2422 datasheet(7/47 Pages) MICROCHIP

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 2013 - 2015 Microchip Technology Inc.

DS00001726B-page 7

USB2422

2.2

Pin Table

2.3

Pin Descriptions (Grouped by Function)

TABLE 2-1:

USB2422 PIN TABLE

UPSTREAM USB 2.0 INTERFACES (3 PINS)

USBDM_UP

usbDM_UP

VBUS_DET

DOWNSTREAM 2-PORT USB 2.0 INTERFACES (9 PINS)

USBDP_DN1/

PRT_DIS_P1

USBDM_DN1/

PRT_DIS_M1

USBDP_DN2/

PRT_DIS_P2

USBDM_DN2/

PRT_DIS_M2

PRTPWR1/

BC_EN1

PRTPWR2

OCS1_N

OCS2_N

RBIAS

SERIAL PORT INTERFACE (2 PINS)

SMBDATA/

NON_REM1

SMBCLK/

CFG_SEL

MISC (5 PINS)

XTALIN/

CLKIN

XTALOUT/

CLKIN_EN

RESET_N

SUSP_IND/

LOCAL_PWR/

NON_REM0

POWER, GROUND, AND NO CONNECTS (5 PINS)

(3) VDD33

CRFILT

PLLFILT

VSS

TOTAL 24

TABLE 2-2:

USB2422 PIN DESCRIPTIONS

Pin #

Symbol

Buffer Type

Description

UPSTREAM USB 2.0 INTERFACES

USBDM_UP

USBDP_UP

IO-U

USB Bus Data:

Connect to the upstream USB bus data signals (host, port, or upstream

hub).

VBUS_DET

Detect Upstream VBUS Power:

Detects the state of upstream VBUS power. The hub monitors

VBUS_DET to determine when to assert the internal D+ pull-up resistor

(signalling a connect event)

When designing a detachable hub, this pin should be connected to

VBUS on the upstream port via a 2:1 voltage divider. Two 100 k

resistors are suggested.

For self-powered applications with a permanently attached host, this pin

must be connected to a dedicated host control output, or connected to

the 3.3 V domain that powers the host (typically VDD33).

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