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Genesys Logic, Inc.
GL650USB USB 4 PORT HUB CONTROLLER
DATA SHEET, Version 1.2
Aug. 18, 2000
Genesys Logic, Inc. 10F, No.11, Ln.3, Tsao Ti Wei, Shenkeng, Taipei, Taiwan Tel: 886-2-2664-6655 Fax: 886-2-2664-5757 http://www.genesyslogic.com
GL650USB 4 PORT USB HUB CONTROLLER
1
FEATURES
* High performance and low-cost solution for USB hub * USB Specification Compliance *
* * * * * * * * * * * * * *
- Conforms to USB specification Rev. 1.1 - Supports 1 device address and 2 endpoints 8-bit micro-processor - RISC-like architecture - USB optimized instruction set - Single cycle instruction execution - Operation Speed: DC to 24 MHz clock input - Performance: 12 MIPS @ 24MHz I/O ports - 4-port hub Internal memory - 64 bytes of RAM - 1.75K x 14 of program ROM On-chip 3.3v output - No external regulator required Integrated USB transceiver 12 MHz external clock Improved output drivers with slew-rate control to reduce EMI Internal power-on reset(POR) Internal power-fail detector for ESD recovery Support suspend/normal mode power management Support power management for downstream port devices Automatic switching between self/bus powered mode Smart LED traffic indicator - The higher data traffic flows through one port, the higher frequency that port's LED will blink. Applications: - Stand-alone USB hub - PC motherboard USB hub 48 pin LQFP package
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GL650USB 4 PORT USB HUB CONTROLLER
2
FUNCTION OVERVIEW
The GLI650USB is a 5 port USB hub with 1 upstream port and 4 downstream ports. It uses an 8-bit RISC-like uC to encode/decode the host commands. The GL650USB is designed mainly for stand-alone hub and can also be integrated in PC mo therboard or any other devices to support USB hub function. The GL650USB can switch between selfpower and bus-power automatically without re-plug in. The GL650USB can be configured as individual mode or ganged mode for the power management of downstream port devices. To prevent from abnormal current consumption of downstream port devices, the GL650USB supplies power enable flags by reading the over-current flags. The GL650USB supports smart traffic indication through the LED lighting. The higher data traffic flows through one port, the higher frequency of that port's LED blinks. To minimize the power consumption, the GL650USB will turn LED off and stop the clock when they are suspended. 3
l
PIN DEFINITIONS AND DESCRIPTIONS
GL650USB Pin No. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 Name DP0 DM0 AGND NC NC DP1 DM1 NC NC DP4 DM4 AVCC DP2 DM2 VCP NC NC DP3 DM3 SUSPND SELF LED1 LED2 LED3 RESET LED4 OVCUR4# NC PWRENB4# I/O I/O I/O I/O I/O I/O I/O I/O I/O I/O I/O O I O O O I O I O Description Upstream port USB data+ Upstream port USB dataAnalog ground 15K resister pull low 15K resister pull low Downstream port 1 USB data+ Downstream port 1 USB data15K resister pull low 15K resister pull low Downstream port 4 USB data+ Downstream port 4 USB dataAnalog VCC(5V) Downstream port 2 USB data+ Downstream port 2 USB data3.3V output 15K resister pull low 15K resister pull low Downstream port 3 USB data+ Downstream port 3 USB dataSuspend indication output 1: SELF-powered. 0: INDIVIDUAL-powered LED traffic indicator for downstream port 1 LED traffic indicator for downstream port 2 LED traffic indicator for downstream port 3 Reset input LED traffic indicator for downstream port 4 Over current flag for downstream port4 Power enable for downstream port 4
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GL650USB 4 PORT USB HUB CONTROLLER
30 NC 31 NC 32 TEST I Test mode input 33 NC 34 XTAL2 O Ceramic resonator or crystal out 35 XTAL1 I Ceramic resonator or crystal in 36 DGND Digital ground 37 PWRENB3# O Power enable for downstream port 3 38 OVCUR3# I Over current flag for downstream port3 39 NC 40 NC 41 DVCC Digital VCC(5V) 42 NC 43 NC 44 PWRENB2# O Power enable for downstream port 2 45 NC 46 OVCUR2# I Over current flag for downstream port2 47 PWRENB1# O Power enable for downstream port 1 48 OVCUR1# I Over current flag for downstream port1 Note 1: "#" means low active Note 2: If using crystal, TEST pull low. If using oscillator, TEST pull high. Table 1 GL650USB Pin Definitions and Descriptions
NC
NC
NC
NC
PWRENB1#
PWRENB2#
NC
DP0 DM0 AGND NC NC DP1 DM1 NC NC DP4 DM4 AVCC
PWRENB3# LED3
OVRCUR1#
OVRCUR2#
OVRCUR3#
DVCC
DGND XTAL1 XTAL2 NC TEST NC NC
PWRENB4# NC OVRCUR4# LED4 SUSPND RESET LED1 LED2 SELF
VCP
DM2
GL650USB GL650USB-A
DM3
DP2
DP3
NC
NC
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GL650USB 4 PORT USB HUB CONTROLLER
4
BLOCK DIAGRAM
UPSTREAM PORT
12 MHz
D+
TRANSCEIVER
D-
PLL SIE Registers
HUB REPEATER MicroController
PORT CONTROLLER
PORT CONTROLLER
ROM
TRANSCEIVER TRANSCEIVER
RAM
D+
D-
LED
D+
D-
LED
DOWNSTREAM PORT 1
DOWNSTREAM PORT 4
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GL650USB 4 PORT USB HUB CONTROLLER 5 REGISTER SUMMARY
MNEMONIC DEVCTL EVTFLG RXCTL0 TXCTL0 TXCTL1 FFDAT BUFCTL PORTSEL HUB_STAT_CHG PORT_STATUS BUS_PORT_DATA HOST_CMD ENP1_IND TRXFLAG LED_INIT GPIOD REV DEVSTUS OFFSET 00h 01h 02h 03h 04h 05h 06h 07h 08h 09h 0Ah 0Bh 0Ch 0Dh 0Eh 0Fh 10h 11h DESCRIPTION Device control register USB function interrupt flag Endpoint 0 RX control Endpoint 0 TX control Endpoint 1 TX control Data buffer (FIFO) I/O port Data buffer control register Hub port to be configured Hub status and status change indicator Hub ports status indicator Hub ports status change indicator Host command to downstream ports Endpoint 1 indicator Downstream port traffic flag LED initial state General purpose I/O pin status Chip revision USB device address and configuration status
Register Description
Terminology: R/O: R/W: R/W1C: W/O: read only read / write read / write "1" to clear write only
DEVCTL R/W USBRDY
( offset 00, default = 00h ) R/W R/W R/O R/O SFRAME ---SELF GANG PWRDN USBRDY : 0 - USB interface is not ready. The device drives USB with SE0. 1 - USB interface is ready. The device stops driving USB with SE0. After power-on reset, USBRDY is cleared and the device looks like disconnected. Set USBRDY to `1' to enable USB interface. SFRAME : short frame option for test purpose Set SFRAME to `1' will shorten frame length to 1/15 ms. It is to shorten the time required for test. PWRDN : power down mode In suspend state, firmware can set PWRDN to put the controller into power down mode. In this mode, the embedded micro-controller and most internal activities are frozen. Hardware will automatically clear PWRDN upon hardware reset or resume activities occur.
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GL650USB 4 PORT USB HUB CONTROLLER
SELF GANG : 0 - HUB is bus powered. 1 - HUB is self powered. : 0 - HUB is in individual mode. 1 - HUB is in ganged mode.
EVTFLG R/W1C
USBRST Interrupt event flag - EP0RX : a SETUP or OUT transaction to endpoint 0 is accepted EP0TX : USB host controller accepts data transmitted via endpoint 0. EP1TX : USB host controller accepts data transmitted via endpoint 1 SUSPD : the controller goes into suspend state WAKEUP : remote wakeup is detected when global suspended SOF : SOF detected or generated by HUB timer. C_LCPWR : POWER source change. USBRST : End of USB reset
R/W1C SOF
( offset 01, default = 00h ) R/W1C R/W1C C_LCPWR WAKEUP
R/W1C SUSPD
R/W1C EP1TX
R/W1C EP0TX
R/W1C EP0RX
RXCTL0 ( offset 02, default = 40h ) R/W R/O R/O R/O R/O R/O R/O R/O RXDIS RXSETUP RXOUT RXSEQ RXCNT3 RXCNT2 RXCNT1 RXCNT0 Status of endpoint 0 receiving - RXCNT3~0 : EP0 received data byte count. RXSEQ : 1 - The received data PID is DATA1 0 - The received data PID is DATA0 RXOUT : 1 - The received token PID is OUT. RXSETUP : 1 - The received token PID is SETUP. RXDIS : 0 - Endpoint 0 FIFO is empty and ready for data-packet receiving. 1 - Endpoint 0 FIFO is filled with data and will reject the new-coming data packet. If RXDIS = 1, the device will not accept an OUT transaction addressed to it, and will respond with a NAK to an error-free transaction. Hardware will automatically set RXDIS after a successful receiving. After processing, the micro-controller should clear RXDIS to enable next data-packet receiving or free FF0 for filling of the data to transmit. Note that a SETUP transaction addressed to the device is always accepted even though RXDIS = 1. TXCTL0 ( offset 03, default = 00h ) R/W R/W R/W R/W R/W R/W R/W -EP0STL EP0OE EP0SEQ EP0CNT3 EP0CNT2 EP0CNT1 EP0CNT0 Endpoint 0 transmit setting - EP0CNT3~0 : number of data bytes to transmit EP0OE : enable data transmit 1 - ready to transmit data packet 0 - not ready to transmit data packet (default) EP0SEQ : data packet type 0 -DATA0 1 -DATA1 EP0STL : set endpoint 0 stall 1 - EP0 will respond to USB host controller with STALL packet EP0STL will be automatically cleared when a setup transaction is accepted.
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GL650USB 4 PORT USB HUB CONTROLLER
After filling the data-to-transmit into FF0, the micro-controller should setup this register to enable endpoint 0 data transmit. If EP0OE = 0, endpoint 0 will respond to a valid IN transaction with a NAK. EP0OE will be automatically cleared after a successful transmission, or when endpoint 0 has incidentally accepted another SETUP or OUT transaction. TXCTL1 ( offset 04, default = 00h ) R/W R/W R/W R/O R/O R/O R/W -EP1STL EP1OE EP1SEQ EP1CNT3 EP1CNT2 EP1CNT1 EP1CNT0 Endpoint 1 transmit setting - EP1CNT3~0 : number of data bytes to transmit. EP1CNT3~1 are always `0'. EP1OE : enable data transmit 1 - ready to transmit data packet 0 - not ready to transmit data packet (default) EP1SEQ : data packet type 0 -DATA0 1 -DATA1 EP1STL : set endpoint 1 stall 1 - EP1 will respond to USB host controller with STALL packet 0 - default After preparing the data to transmit, the micro-controller should setup this register to enable endpoint 1 data transmit. If EP1OE = 0, endpoint 1 will respond to a valid IN transaction with a NAK. After a successful transmission, the device will automatically clear EP1OE.
FFDAT ( offset 05, default = 00h ) R/W R/W R/W R/W R/W R/W R/W R/W FFD7 FFD6 FFD5 FFD4 FFD3 FFD2 FFD1 FFD0 If FFSEL1 (in BUFCTL) = 1'b0, this is FF0 access-window; if FFSEL1 = 1'b1, this is FF1 access-window. Each FFDAT read/write will automatically increase the FIFO pointer, which is a 3-bit circular counter, by 1. Writing FPRST with `1' (in BUFCTL) will reset the pointer. Note that to fill FF0, RXDIS (in RXCTL0) must be first cleared. BUFCTL -( offset 06 ) ----Data buffer control - FFSEL1 : FIFO 0/1 selector 1'b0 - select endpoint 0 data buffer 1'b1 - select endpoint 1 data buffer FPRST : reset FIFO 0/1 pointer (write only) ( offset 07, default = 00h ) R/W R/W R/W PORTSEL PORTSEL1 PORTSEL2 PORTSEL3 PORTSEL4 W/O FPRST -R/W FFSEL1
PORTSEL --
R/W R/W PORTSEL PORTSEL 4 3 : PORT 1~7 under request 1'b1 - port 1 selected 1'b1 - port 2 selected 1'b1 - port 3 selected 1'b1 - port 4 selected
R/W PORTSEL 2
R/W PORTSEL 1
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GL650USB 4 PORT USB HUB CONTROLLER
HUB_STAT_CHG ( offset 08, default = 00h ) R/O R/O R/O R/O LCPWR OVCUR ----C_LCPWR C_OVCUR HUB status and status change LCPWR : HUB local power status 1'b0 - local power good 1'b1 - local power lost OVRCUR : HUB over current indicator 1'b0 - No over-current condition currently exists 1'b1 - A hub over-current condition exists C_LCPWR : Local power status change 1'b0 - No change has occurred to local power status 1'b1 - local power status has changed C_OVRCUR : HUB over current indicator change 1'b0 - No change has occurred to the over-current indicator 1'b1 - Hub over-current indicator has changed PORT_STATUS ( offset 09, default = 00h ) R/O R/O R/O R/O R/O R/O R/O PT_LOW_ PT_PWR -PT_RST PT_OVCU PT_SUS PT_EN PT_CON SPD R Port status indicator: PT_LOW_SPD : 1'b0 - full speed device connected, 1'b1 - low speed device connected PT_PWR : 1'b0 - port is in power off state, 1'b1 - port is not in power off state PT_RST : 1'b0 - Reset signaling not asserted, 1b'1 - Reset signaling asserted PT_OVCUR : 1'b0 - No over-current condition occurred on this port 1'b1 - An over-current condition exists on this port PT_SUS : 1'b0 - port not suspended, 1'b1 - port suspended or resuming PT_EN : 1'b0 - port is disabled, 1'b1 - port is enabled PT_CON : 1'b0 - No device is present, 1'b1 - A device is present on this port BUS_PORT_DATA R/O R/O VP VM ( offset 0A, default = 00h ) R/O -C_PT_RST
R/O R/O R/O R/O C_PT_ C_PT_ C_PT_EN C_PT_ OVCUR SUS CON Bus state and Port status change in dicator: VP : VP state on the downstream port VM : VM state on the downstream port C_PT_RST : 1'b0 - No change, 1'b1 - Reset complete C_PT_OVCUR : 1'b0 - No change has occurred to over-current indicator 1'b1 - over-current indicator has changed C_PT_SUS : 1'b0 - No change, 1'b1: - Resume complete C_PT_EN : Set to one when a port is disabled because of a Port_error condition C_PT_CON : 1'b0 - No change has occurred to current connect status 1'b1 - Current connect status has changed
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GL650USB 4 PORT USB HUB CONTROLLER
HOST_CMD ( offset 0B, default = 0Fh ) W/O W/O W/O W/O W/O W/O W/O W/O HB_CMD3 HB_CMD2 HB_CMD1 HB_CMD0 PT_CMD3 PT_CMD2 PT_CMD1 PT_CMD0 Host command to the hub: PT_CMD3~0 : 4'h0 -SetPortFeature(PORT_SUSPEND) : 4'h1 -SetPortFeature(PORT_RESET) : 4'h2 -SetPortFeature(PORT_POWER) : 4'h3 -ClearPortFeature(PORT_ENABLE) : 4'h4 -ClearPortFeature(PORT_SUSPEND) : 4'h5 -ClearPortFeature(PORT_POWER) : 4'h6 -ClearPortFeature(C_PORT_RESET) : 4'h7 -ClearPortFeature(C_PORT_OVER_CURRENT) : 4'h8 -ClearPortFeature(C_PORT_SUSPEND) : 4'h9 -ClearPortFeature(C_PORT_ENABLE) : 4'hA -ClearPortFeature(C_PORT_CONNECTION) HB_CMD3 : 1'b1 -SetHubFeature(C_HUB_LOCAL_POWER) HB_CMD2 : 1'b1 -SetHubFeature(C_HUB_OVER_CURRENT) HB_CMD1 : 1'b1 -ClearHubFeature(C_HUB_LOCAL_POWER) HB_CMD0 : 1'b1 -ClearHubFeature(C_HUB_OVER_CURRENT) ENP1_IND R/O ( offset 0C, default = 00h ) R/O R/O R/O PT4 Endpoint 1 interrupt change indicator
R/O PT3
R/O PT2
R/O PT1
R/O HUB
TRXFLAG
( offset 0D, default = 00h ) R/W1C R/W1C R/W1C R/W1C R/W1C R/W1C -P4_TRX P3_TRX P2_TRX Upstream traffic flag: P1_TRX : upstream traffic happens on downstream port 1 P2_TRX : upstream traffic happens on downstream port 2 P3_TRX : upstream traffic happens on downstream port 3 P4_TRX : upstream traffic happens on downstream port 4
R/W1C P1_TRX
LED_INIT
( offset 0E, default = 00h ) R/W1C R/W1C R/W1C R/W1C R/W1C R/W1C R/W1C -P4_ON P3_ON P2_ON P1_ON LED initial flag: P1_ON : if 1'b1, LED is always on, otherwise, judge according to TRXFLAG register. P2_ON : if 1'b1, LED is always on, otherwise, judge according to TRXFLAG register. P3_ON : if 1'b1, LED is always on, otherwise, judge according to TRXFLAG register. P4_ON : if 1'b1, LED is always on, otherwise, judge according to TRXFLAG register.
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GL650USB 4 PORT USB HUB CONTROLLER
GPIOD
(offset 0F, default = 0Fh) R/W R/W
R/W
R/W GPIO3D/ LED4#
R/W GPIO2D/ LED3#
R/W GPIO1D/ LED2#
R/W GPIO0D/ LED1#
General purpose I/O pin status - If GPIOXOE = 1 (X: 0 ~ 3), GPIOX is driven with the level of internal GPIOXD latch, which is the same as corresponding GPIOXD bit. If GPIOXOE = 0, GPIOXD reflects the level of GPIOX pin, which may be different from internal GPIOXD latch. The value written to GPIOD will be stored in an internal latch, no matter what direction the GPIOX pins are in. Bits 3 to 0 have been pre-assigned specific functions for LED indicators. (active low). REV R/O REV7 ( offset 10, default = current revision ) R/O R/O R/O R/O R/O R/O REV6 REV5 REV4 REV3 REV2 REV1 This register returns current silicon revision number of the HUB. Current revision is 8'h11. (Revision 1.1)
R/O REV0
DEVSTUS ( offset 11, default = 00h ) R/W R/W R/W R/W R/W R/W R/W R/W HCONFIG DEVADR6 DEVADR5 DEVADR4 DEVADR3 DEVADR2 DEVADR1 DEVADR0 USB device status registers. Procedure to set the device address: 1. After USB reset, the device responds to default address 0, and hub configuration = 0. 2. USB host controller issues SET_ADDRESS request to the device. (INTRB asserted) 3. Micro-controller recognizes the request, then set DEVADR register with appropriate value. 4. Micro-controller prepares the status stage of SET_ADDRESS request by programming TXCTL0 register. 5. When the hub configuration value is not equal zero, HCONFIG is set to one. USB reset will clear this register.
6
MAXIMUM RATINGS
Maximum ratings are the extreme limits to which the GL650USB/GL650USB-A can be exposed without permanently damaging it. The GL650USB/GL650USB-A contain circuitry to protect the inputs against damage from high static voltages; however, do not apply voltages higher than those shown in the table. Keep VIN and VOUT within the range GND (VIN or VOUT) VCC. Connect unused inputs to the appropriate voltage level, either GND or VDD . Symbol TSTG TOP VCC VIN I IMGND IMVCC VESD Characteristic Storage temperature Operating temperature Supply voltage DC input voltage Maximum current per pin excluding VDD and VSS Maximum current out of GND Maximum current out of VCC Static discharge voltage Value -55 to +150 0 to +70 -0.5 to +7.0 -0.5 to +VDD + 0.5 25 100 100 >4000 Unit C C V V mA mA mA V
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GL650USB 4 PORT USB HUB CONTROLLER
7
ELECTRICAL CHARACTERISTICS
Tese Conditions Min. 4.5 4.5 Typ. 5.0 5.0 Max. 5.5 5.5 Unit V V mA mA V V V V V V V
Symbol Parameter Supply VDD Digital Power Supply VDDA Analog Power Supply IDD Digital Supply Current IDDA Analog Supply Current USB Bus: DP and DM VCP Regulated Voltage Output VDI Static Input Voltage VDO Static Output Voltage Digital I/O Pins VIL Input Logic Low Voltage VIH Input Logic High Voltage VOL Output Logic Low Voltage VOH Output Logic High Voltage
3.0 0 0 2.0 0.9xVDD
3.3 -
3.6 VCP VCP 0.8 0.1xVDD -
IO =-4.0mA IO =+4.0mA
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GL650USB 4 PORT USB HUB CONTROLLER
8
PACKAGE DIAGRAM
48-LQFP SYVBOIS A A1 A2 C1 D D1 E E1 e b L L1
D D1
MIN 0.05 1.35 0.09 9.00BSC 7.00BSC 9.00BSC 7.00BSC 0.5BSC 0.17 0.45 1 REF
MAX 1.6 0.15 1.45 0.16
0.27 0.75
E
0.25
E1
L L1
b e
C1
A2
A
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Revision 1.2
A1
A
B
C
D
E
9. Application Circuit (1)
4 4
PWRENB1#
PWRENB2#
PWRENB3#
B_VCC OVRCUR1#
OVRCUR3#
OVRCUR2#
R1
1M
C1 0.1U U1
C2 30P
Y1 12 MHz C3 30P
48
47
46
45
44
43
42
41
40
39
38 OVRCUR3#
PWRENB1#
PWRENB2#
DP0 DM0
1 2 3
PWRENB3#
OVRCUR1#
OVRCUR2#
DVCC
NC
NC
NC
NC
NC
37
DP0 DM0 AGND NC NC DP1 DM1 NC NC DP4 DM4 AVCC
DGND XTAL1 XTAL2 NC TEST NC NC
36 35 34 33 32 31 30 29 28 27 26 25 R7 10K OVRCUR4# LED4 B_VCC B_VCC PWRENB4# LED4 LED3 R2 24 LED2 XTAL1 LED1 D1 LED D2 LED D3 LED D4 LED R6 1K VOUT4 R5 1K VOUT3 R4 1K VOUT2 R3 1K VOUT1
3
3
4 5 DP1 DM1 6 7 8 9 DP4 DM4 B_VCC C4 0.1U C6 C5 4.7U + 10 11 12
PWRENB4# NC OVRCUR4# LED4 SUSPND RESET LED1 LED2 23 LED3 24 SELF 21
DM2
13
14
15
16
17
18
19
DM3
VCP
DP2
DP3
NC
NC
20
2
22
2
0.1U
LED1
LED2
GL650USB R8 VCP SUSPEND 1M
1
SELF
LED3
DP2
DM2
DP3
DM3
1
Title CIRCUIT FOR GENESYS 4-PORT USB HUB Size B Date:
A B C D
Document Number USBHUB.DSN Thursday, August 17, 2000 Sheet
E
Rev 1.2 1 of 3
A
B
C
D
E
9. Application Circuit (2)
VCP R9
4
B_VCC C7 + 1.5K L1 R10 22 R11 22 C9 47P L2 FB FB 10U S_VCC J1 1 2 3 4 USB-B D R12 B_VCC 4.7K G S Q1 VCC TP0610T D 2N7002 R13 U2 1M L3 FB C11 0.1U L4 FB R20 15K R21 15K J3 POWER JACK A 6V adapter is recommended. C12 0.1U C13 47U R19 R22 267K,%1 825K,%1 C14 0.1U
3 4
DM0 DP0 C8 47P
Q2 G S MIC 29302
SELF Q3 FDN340P G D D R16 VCC VCC B_VCC S S Q5 2N7002 D 1M G G REN Q4 2N7002 R14 470 S
R15 4.7K REN S_VCC 1 2 3 4 5 VCC
J2 DM1 DP1 R17 22 R18 22 1 2 3 4 USB-A
VOUT1 + C10 120U
3
L5 VOUT2 + C15 120U L6
FB C16 0.1U FB R25 15K R26 15K DM2 DP2 R23 22 R24 22
J4 1 2 3 4 USB-A
B_VCC C17 U3 PWRENB1# FLG1# L7 VOUT3
2
B_VCC
1 2 3 4
ENA# FLGA# FLGB# ENB#
OUTA# IN GND OUTB#
8 7
VOUT1
0.1U R27 10K FLG1# OVRCUR1# C19 R29 10K 0.1U FLG2# C20 R30 10K 0.1U R28 10K OVRCUR2#
2
FB C21 0.1U DM3 DP3 R31 22 R32 22
J5 1 2 3 4 USB-A FLG2# PWRENB2#
6 5 VOUT2
+ C18 120U L8 FB
MIC2526-8
R33 15K
R34 15K VCC
B_VCC C22 U4 L9 VOUT4 + C23 120U L10 FB R41
1
B_VCC
FB C24 0.1U R42 15K DM4 DP4 R37 22 R38 22
J6 1 2 3 4 USB-A
PWRENB3# FLG3# FLG4# PWRENB4#
1 2 3 4
ENA# FLGA# FLGB# ENB#
OUTA# IN GND OUTB#
8 7
VOUT3
0.1U R35 10K FLG3# C25 OVRCUR3# R39 10K 0.1U FLG4# C26 R40 10K 0.1U R36 10K OVRCUR4#
6 5 VOUT4
MIC2526-8
1
15K
Title CIRCUIT FOR GENESYS 4-PORT USB HUB Size Custom Date:
A B C D
Document Number USBHUB.DSN Thursday, August 17, 2000
E
Rev 1.2 Sheet 2 of 3
A
B
C
D
E
9. Application Circuit (3)
4
4
Rev.
1.0 1. First Product Release 1.1 1. 2. 3. 4.
Description
Seperate 4-port and 7-port hubs into different schematic files. Omit the ganged mode pull-up resistor on 'SUSPND' pin. Add a 10K pull-up resistor to 'RESET' pin. Connect pin 1 of U2 to B_VCC, then regulator will be enabled only when upstream port is plugged! A 1M pull-low resistor is also added to disable this pin when the upstream port is not plugged.
Date
'00/04/05 '00/05/18
3
5. 'SELF' is directly connected to drain of Q4 to omit the external debounce RC circuit for this pin. 6. Q1 is replaced by a more popular and cheaper one -- FDN340P. 7. Some resistor values are increased to save the operating current.
3
1.2
1. Change the pull-up voltage source for each LED from B_VCC to power switch output. 2. Remove the 47U output capacitor of MIC29302 to suppress inrush current. 3. Add R1, R2 and C6 for EMI suppressing. 4. Change C10, C15, C18 and C23 from 100U to 120U for better behavior in droop test. 5. Add a 2-transistor circuit for regulator ENABLE pin. That will save several tens of mA operating current than direct connecting B_VCC to ENABLE pin. 6. Remove a redudant transistor in SELF-BUS power switching circuit.
'00/08/17
2
2
1
1
Title CIRCUIT FOR GENESYS 4-PORT USB HUB Size B Date:
A B C D
Document Number USBHUB.DSN Thursday, August 17, 2000 Sheet
E
Rev 1.2 3 of 3

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