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USB2422 Datasheet(PDF) 9 Page - Microchip Technology |
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USB2422 Datasheet(HTML) 9 Page - Microchip Technology |
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9 / 47 page  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 |
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Similar Description - USB2422 |
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