Datasheet

 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
NC
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
19
20
USBDM_UP
USBDP_UP
IO-U USB Bus Data:
Connect to the upstream USB bus data signals (host, port, or upstream
hub).
16 VBUS_DET I 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 kΩ
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).