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USB2422T-I/MJ

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P30P31-P33P34-P36P37-P39P40-P42P43-P45P46-P47
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).
USB2422
DS00001726B-page 8 2013 - 2015 Microchip Technology Inc.
DOWNSTREAM USB 2.0 INTERFACES
5
3
and
4
2
USBDP_DN[2:1]/
PRT_DIS_P[2:1]
and
USBDN_DN[2:1]/
PRT_DIS_M[2:1]
IO-U Hi-Speed USB Data:
Connect to the downstream USB peripheral devices attached to the
hub’s ports.
Port Disable Strap Option:
If this strap is enabled by package and configuration settings (see
Table 4-1, "Hub Configuration Options"), this pin will be sampled at
RESET_N negation to determine if the port is disabled.
Both USB data pins for the corresponding port must be tied to VDD33
to disable the associated downstream port.
7 PRTPWR1/ O12 USB Power Enable:
Enables power to USB peripheral devices that are downstream, where
the hub supports active high power controllers only.
BC_EN1 IPD Battery Charging Strap Option:
Port 1 pin will be sampled at RESET_N negation to determine if port 1
supports the battery charging protocol (and thus the supporting external
port power controllers) that would enable a device to draw the currents
per the USB Battery Charging Specification.
This pin has an internal pull-down that will be removed after the strap
option hold time is completed.
BC_EN1= 1: Battery charging feature is supported for port 1
BC_EN1= 0: Battery charging feature is not supported for port 1
11 PRTPWR2 O12 USB Power Enable:
Enables power to USB peripheral devices that are downstream, where
the hub supports active high power controllers only.
8
12
OCS1_N
OCS2_N
IPU Over-Current Sense:
Input from external current monitor indicating an over-current condition.
This pin contains an internal pull-up to the 3.3 V supply.
24 RBIAS I-R USB Transceiver Bias:
A12.0 kΩ (+/- 1%) resistor is attached from ground to this pin to set the
transceiver’s internal bias settings.
SERIAL PORT INTERFACE
13 SMBDATA I/OSD12 System Management Bus Data
NON_REM1 Non-removable Port Strap Option:
This pin is sampled (in conjunction with SUSP_IND/NON_REM0) at
RESET_N negation to determine if ports [2:1] contain permanently
attached (non-removable) devices:
NON_REM[1:0] = 00: all ports are removable
NON_REM[1:0] = 01: port 1 is non-removable
NON_REM[1:0] = 10: ports 1 and 2 are non-removable
NON_REM[1:0] = 11: reserved
See Section 2.5, "Strap Pin Configuration" for details.
14 SMBCLK/ I/OSD12 System Management Bus Clock
CFG_SEL Configuration Select:
The logic state of this multifunction pin is internally latched on the rising
edge of RESET_N (RESET_N negation), and will determine the hub
configuration method as described in Table 4-1.
TABLE 2-2: USB2422 PIN DESCRIPTIONS (CONTINUED)
Pin # Symbol Buffer Type Description
2013 - 2015 Microchip Technology Inc. DS00001726B-page 9
USB2422
MISC
22 XTALIN/
CLKIN
ICLKx 24 MHz Crystal or External Clock Input:
This pin connects to either one terminal of the crystal or to an external
24 MHz clock when a crystal is not used.
21 XTALOUT OCLKx Crystal Output:
This is the other terminal of the crystal circuit with 1.2 V p-p output and
a weak (< 1 mA) driving strength. When an external clock source is
used to drive XTALIN/CLKIN, leave this pin unconnected, or use with
appropriate caution.
15 RESET_N IS RESET Input:
The system must reset the chip by driving this input low. The minimum
active low pulse is 1 μs.
6 NC IPD Treat as a no connect pin or connect to ground. No trace or signal
should be routed or attached to this pin.
17 SUSP_IND I/O12 Suspend Indicator:
Indicates the USB state of the hub.
negated : unconfigured, or configured and in USB Suspend
asserted : Hub is configured, and is active (i.e., not in suspend)
LOCAL_PWR Local Power:
This input selects whether the hub reports itself as bus or self-powered
when dynamic power switching is enabled via the Dynamic Power
Enable (DYNAMIC) bit of the Configuration Data Byte 2 Register
(CFG2). This pin is sampled at POR/Reset before the USB Hub Attach
command is sent. Once the hub has entered the attach state (as
indicated by the USB Attach and Write Protect (USB_ATTACH) bit of the
Status/Command Register (STCD)), this pin cannot be changed.
Low : self/local power source is not available (i.e., the Hub gets all
power from the upstream USB VBus).
High : self/local power source is available.
Note: Never tie this pin directly to VDD33, as doing so may cause it
to act as SUSP_IND.
Note: This pin assumes the meaning of local power input only if
properly configured via SMBus. If the hub is configured via
straps, it is NON_REM0 at reset and SUSP_IND after reset.
(NON_REM0) Non-Removable Port Strap Option:
This pin is sampled (in conjunction with SUSP_IND/NON_REM0) at
RESET_N negation to determine if ports [2:1] contain permanently
attached (non-removable) devices:
NON_REM[1:0] = 00: all ports are removable
NON_REM[1:0] = 01: port 1 is non-removable
NON_REM[1:0] = 10: ports 1 and 2 are non-removable
NON_REM[1:0] = 11: reserved
See Section 2.5, "Strap Pin Configuration" for details.
TABLE 2-2: USB2422 PIN DESCRIPTIONS (CONTINUED)
Pin # Symbol Buffer Type Description
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P30P31-P33P34-P36P37-P39P40-P42P43-P45P46-P47

USB2422T-I/MJ

Mfr. #:
Buy USB2422T-I/MJ
Manufacturer:
Microchip Technology
Description:
USB Interface IC Low Pin Count 2-Port USB 2.0 Hi-Speed Hub Controller
Lifecycle:
New from this manufacturer.
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