Philips PDIUSBH12D, PDIUSBH12N Datasheet

INTEGRATED CIRCUITS

PDIUSBH12

USB 2-port hub

Product specification						1999 Jul 22
Supersedes data of 1999 Feb 25

P s

on o s

Philips Semiconductors	Product specification
USB 2-port hub	PDIUSBH12

FEATURES

•Complies with the Universal Serial Bus specification Rev. 1.0

•Complies with the ACPI, OnNOW, and USB power management requirements

•Compliant with USB Human Interface Devices and Monitor Control Class

•Compliant with System Management Bus Specification Rev. 1.0

•Two downstream ports with per packet connectivity and auto speed detection

•Supports up to 3 embedded functions

•Integrated SIE (Serial Interface Engine), FIFO memory and transceivers

•Automatic USB protocol handling

•High speed slave I2C Interface (up to 1 Mbit/s)

•Compatible with the PDIUSBH11 hardware and software

•Software controllable connection to USB bus (SoftConnect )

•Good USB downstream connection indicators that blink with traffic (GoodLink )

•Low frequency 12 MHz crystal oscillator eases EMI design issues

•Programmable output clock frequency

•Bus powered capability with very low suspend current

•Controllable LazyClock output at 30 kHz (nominal) during suspend

•Single 3.3V supply with 5V tolerant I/O

•Available in 28-pin DIP and SO packages

•Full-scan design with high fault coverage (>99%) insures high quality

•Higher than 8 KV in-circuit ESD protection lowers cost of extra components

DESCRIPTION

The Universal Serial Bus Hub PDIUSBH12 is a cost and feature optimized second generation USB Hub with 2 downstream ports and

3 embedded functions (compound hub). It is normally used in any microcontroller-based system and communicates with the system microcontroller over the high speed I2C serial bus. This modular approach to implementing a hub and embedded functions allows the designer to choose the optimum system microcontroller from the available wide variety. This flexibility cuts down the development time, risks and costs by allowing the use of the existing architecture and the firmware investments. This results in the fastest way to develop the most cost-effective USB peripheral solutions that need hub functionality. The PDIUSBH12 is ideally suited for computer monitors, docking stations, keyboards and many other applications that use the I2C or the SMBus based architecture.

The PDIUSBH12 conforms to the USB specification Rev 1.0, I2C serial interface and the SMBus specifications. It is fully compliant with the Human Interface Device Class and Monitor Control Class specifications. Its low suspend power consumption along with the programmable LazyClock output allows for easy implementation of equipment that is compliant to the ACPI, OnNow and USB power management requirements. The low operating power allows the implementation of the bus powered or the compound powered hub function.

The PDIUSBH12 is fully backward compatible to the first generation

PDIUSBH11 hardware and software. This allows an easy running change in the manufacturing line to realize the cost savings. In addition, it also incorporates the feature enhancements like

SoftConnect , GoodLink , LazyClock, programmable clock output, lower frequency crystal oscillator, additional embedded functions and integration of termination resistors. All of these feature enhancements contribute to significant cost savings in the system implementation and at the same time ease the implementation of advanced USB functionality into the peripherals.

ORDERING INFORMATION

PACKAGES	TEMPERATURE RANGE	OUTSIDE NORTH AMERICA	NORTH AMERICA	PKG. DWG. #
28-pin plastic SO	±40°C to +85°C	PDIUSBH12 D	PDIUSBH12 D	SOT136-1
28-pin plastic DIP	±40°C to +85°C	PDIUSBH12 N	PDIUSBH12 N	SOT117-1

1999 Jul 22

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853-2062 22025

Philips Semiconductors	Product specification
USB 2-port hub	PDIUSBH12

BLOCK DIAGRAM

					UPSTREAM		12 MHz
		3.3V			PORT
					D+	D±
		1.5kΩ					PLL	INTEGRATED
								RAM
		D+					BIT CLOCK
		SoftConnect
					ANALOG		RECOVERY
					TX/RX
						FULL SPEED	PHILIPS	MEMORY		I2C
								MANAGEMENT		SLAVE
							SIE
								UNIT		INTERFACE
					HUB		END OF
							FRAME
					REPEATER
							TIMERS
								GENERAL
								PORT
								CONTROLLER
ANALOG		GOODLINK	ANALOG		GOODLINK				INTERRUPT	SDA SCL
TX/RX		CONTROL	TX/RX		CONTROL
								NO LIGHT	LIT	BLINKING
D+	D±	LED	D+	D±	LED			NO	CONNECTED	DATA
								CONNECTION		TRANSFER
	DOWNSTREAM		DOWNSTREAM						GOODLINK
	PORT 2			PORT 3
										SV00852

NOTE:

1. This is a conceptual block diagram and does not include each individual signal.

1999 Jul 22

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Philips Semiconductors	Product specification
USB 2-port hub	PDIUSBH12

Analog Transceivers

These transceivers interface directly to the USB cables through some termination resistors. They are capable of transmitting and

receiving serial data at both ªfull speedº (12 Mbit/s) and ªlow speedº (1.5 Mbit/s) data rates.

Hub Repeater

The hub repeater is responsible for managing connectivity on a per packet basis. It implements packet signaling connectivity and resume connectivity.

Low speed devices can be connected to downstream ports since the repeater will not propagate upstream packets to downstream ports, to which low speed devices are connected, unless they are preceded by a PREAMBLE PID.

Memory Management Unit (MMU) and Integrated RAM

The MMU and the integrated RAM is used to handle the large difference in data rate between USB, running in bursts of 12 Mbit/s and the I2C interface to the microcontroller, running at up to

1 Mbit/s. This allows the microcontroller to read and write USB packets at its own speed through I2C.

I2C Slave Interface

This block implements the necessary I2C interface protocol. A slave I2C allows for simple micro-coding. An interrupt is used to alert the microcontroller whenever the PDIUSBH12 needs attention. As a slave I2C device, the PDIUSBH12 I2C clock: SCL is an input and is controlled by the microcontroller. The I2C interface can run up to 1 Mbit/s.

End of Frame Timers

This block contains the specified EOF1 and EOF2 timers which are used to detect loss-of-activity and babble error conditions in the hub repeater. The timers also maintain the low-speed keep-alive strobe which is sent at the beginning of a frame.

General and Individual Port Controller

The general and individual port controllers together provide status and control of individual downstream ports. Via the I2C-interface a microcontroller can access the downstream ports and request or change the status of each individual port.

Any change in the status or settings of the individual port will result in an interrupt request. Via an interrupt register, the servicing microcontroller can look up the downstream port which generated the interrupt and request its new status. Any port status change can then be reported to the host via the hub status change (interrupt) endpoint.

PLL

A 12 MHz to 48 MHz clock multiplier PLL (Phase-Locked Loop) is integrated on-chip. This allows for the use of low-cost 12 MHz crystal. EMI is also minimized due to lower frequency crystal. No external components are needed for the operation of the PLL.

Bit Clock Recovery

The bit clock recovery circuit recovers the clock from the incoming

USB data stream using 4X over-sampling principle. It is able to track jitter and frequency drift specified by the USB specification.

Philips Serial Interface Engine (PSIE)

The Philips SIE implements the full USB protocol layer. It is completely hardwired for speed and needs no firmware intervention. The functions of this block include: synchronization pattern recognition, parallel/serial conversion, bit stuffing/de-stuffing, CRC checking/generation, PID verification/generation, address recognition, handshake evaluation/generation.

SoftConnect

The connection to the USB is accomplished by bringing D+ (for high-speed USB device) high through a 1.5 kΩ pull-up resistor. In the PDIUSBH12, the 1.5 kΩ pull-up resistor is integrated on-chip and is not connected to VCC by default. Similarly, the 15 kΩ pull-down resistors are integrated on-chip and are not connected to GND by default. The connection of the internal resistors to Vcc is established through a command sent by the external/system microcontroller. This allows the system microcontroller to complete its initialization sequence before deciding to establish connection to the USB. Re-initialization of the USB bus connection can also be affected without requiring the pull out of the cable.

The PDIUSBH12 will check for USB VBUS availability before the connection can be established. VBUS sensing is provided through OCURRENT_N pin. See the pin description for details. Sharing of

VBUS sensing and overcurrent sensing can be easily accomplished by using VBUS voltage as the pull-up voltage for the open drain output of the overcurrent indication device.

It should be noted that the tolerance of the internal resistors is higher (30%) than that specified by the USB specification (5%).

However, the overall VSE voltage specification for the connection can still be met with good margin. The decision to make use of this feature lies with the users.

SoftConnect is a patent pending technology from Philips Semiconductors.

GoodLink

Good downstream USB connection indication is provided through GoodLink technology. When the port is enabled and there is at least one valid upstream traffic from the port, the LED indicator will be ON. The LED indicator will blink on every valid upstream traffic. A valid upstream traffic is defined as traffic with a good SOP and terminated by a good EOP. During global suspend, all LEDs will be OFF.

This feature provides a user-friendly indicator on the status of the hub, the connected downstream devices and the USB traffic. It is a useful field diagnostics tool to isolate the faulty equipment. This feature helps lower the field support and the hotline costs.

1999 Jul 22

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Philips Semiconductors	Product specification
USB 2-port hub	PDIUSBH12

ENDPOINT DESCRIPTIONS

There are two endpoint configuration modes supported by the PDIUSBH12, the Single Embedded Function mode and the Multiple (3)

Embedded Function mode. The Single Embedded Function mode is the default at power up reset. The Multiple (3) Embedded Function mode can be configured by writing a zero to bit 7 of the first byte of the Set Mode command. Either mode is backward compatible to the PDIUSBH11.

Table 1. SINGLE EMBEDDED FUNCTION MODE (DEFAULT AT POWER UP)

				ENDPOINT	TRANSFER		MAX
	FUNCTION	PORTS	ENDPOINT #			DIRECTION	PACKET SIZE
				INDEX	TYPE
							(BYTES)
		0: Upstream	0	0	Control	OUT	8
	Hub			1		IN	8
		2±3: Downstream
			1	±	Interrupt	IN	1
			0	2	Control	OUT	8
				3		IN	8
			1	5	Generic	OUT	8
	Embedded			4		IN	8
		1
	Function 1		2	6	Generic	OUT	8
				7		IN	8
			3	8	Generic	OUT	8
				9		IN	8

NOTE:

1.Hub interrupt endpoint is not indexed.

2.Generic endpoint can be used for Interrupt or Bulk endpoint.

Table 2. MULTIPLE (3) EMBEDDED FUNCTION MODE

				ENDPOINT	TRANSFER		MAX
	FUNCTION	PORTS	ENDPOINT #			DIRECTION	PACKET SIZE
				INDEX	TYPE
							(BYTES)
		0: Upstream	0	0	Control	OUT	8
	Hub			1		IN	8
		2±3: Downstream
			1	±	Interrupt	IN	1
			0	2	Control	OUT	8
	Embedded			3		IN	8
		1
	Function 1		1	5	Generic	OUT	8
				4		IN	8
			0	10	Control	OUT	8
	Embedded			11		IN	8
		6
	Function 6		1	6	Generic	OUT	8
				7		IN	8
			0	12	Control	OUT	8
	Embedded			13		IN	8
		7
	Function 7		1	8	Generic	OUT	8
				9		IN	8

1999 Jul 22

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Philips Semiconductors	Product specification
USB 2-port hub	PDIUSBH12

PINNING

The PDIUSBH12 has two modes of operation. The first mode (Mode 0) configures the pins DNx_GL_N for GoodLink LED indication. The second mode (Mode 1) configures the LED pins as per port overcurrent condition pins. An overcurrent condition on any port can be uniquely identified in Mode 1. However, all downstream ports are disabled as a result of a single overcurrent condition. In addition to the two modes of operation, the PDIUSBH12 can also be configured to take either a 48 MHz crystal oscillator (for backward compatibility to PDIUSBH11) or a 12 MHz crystal.

The internal 4X clock multiplier PLL will be activated when 12 MHz input XTAL mode is selected. Also, the output clock frequency is now programmable rather than fixed to 12 MHz. The output clock frequency can be programmed through the Set Mode command. All these new features are added while maintaining backward compatibility to the PDIUSBH11 through TEST2 and TEST1 pins.

	TEST2 TEST1	MODE	INPUT XTAL FREQUENCY	OUTPUT CLOCK FREQUENCY
			(MHz)	(AT REST)
	00	MODE 0	48	12MHz
		(GoodLink )
	01	MODE 0	12	4 MHz
		(GoodLink )
	10	MODE 1	12	4 MHz
		(Individual Overcurrent)
	11	MODE 1	48	12 MHz
		(Individual Overcurrent)
	NOTE:
	1. Pin TEST3 should always be connected to Ground at all times.

Pin configuration

TEST1	1		28	UP_DM
TEST2				UP_DP
	2		27
TEST3				AVCC
	3		26
RESET_N				AGND
	4		25
GND				DN2_DM
	5		24
XTAL1				DN2_DP
	6		23
XTAL2				DN3_DM
	7		22
CLKOUT				DN3_DP
	8		21
VCC				GND
	9		20
OCURRENT_N /				SCL
	10		19
OCURRENT2_N
			18
SWITCH_N	11			SDA
SUSPEND				INT_N
	12		17
DN2_GL_N 13			16	RSVD
DN3_GL_N /	14		15	RSVD
OCURRENT3_N

SV01751

NOTE:

Pin 10 and Pin 14 show alternative pin functions, depending on mode of operation (Mode 0 or Mode 1) as described in

Pin Description.

1999 Jul 22

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Philips Semiconductors	Product specification
USB 2-port hub	PDIUSBH12

Pin description (MODE 0 ± Good Link )

PIN NO.	PIN SYMBOL	TYPE	DRIVE	DESCRIPTION
1	TEST1	Input		Connect to Ground for 48MHz crystal input.
				Connect to VCC for 12MHz crystal input.
2	TEST2	Input		Connect to Ground
3	TEST3	Input		Connect to Ground
4	RESET_N	Input	ST	Power-on reset
5	GND	Power		Ground reference
6	XTAL1	Input		Crystal connection 1 (48 or 12MHz depending on TEST1 pin)
7	XTAL2	Output		Crystal connection 2 (48 or 12MHz depending on TEST1 pin)
8	CLKOUT	Output	3mA	Programmable output clock for external devices
9	VCC	Power		Voltage supply 3.3V ± 0.3V
				Over-current notice to the device. This pin is also used to sense the USB VBUS.
10	OCURRENT_N	Input	ST	A LOW on this pin of less than 2 seconds is interpreted as an overcurrent notice;
				longer than 2 seconds is interpreted as loss of VBUS.
11	SWITCH_N	Output	OD6	Enables power to downstream ports
12	SUSPEND	Output	OD6	Device is in suspended state
13	DN2_GL_N	Output	OD6	Downstream port 2 GoodLink LED indicator
14	DN3_GL_N	Output	OD6	Downstream port 3 GoodLink LED indicator
15	RSVD	Input		Reserved. Connect to GND for normal operation.
16	RSVD	Input		Reserved. Connect to GND for normal operation.
17	INT_N	Output	OD6	Connect to microcontroller interrupt
18	SDA	I/O	OD6	I2C bi-directional data
19	SCL	I/O	OD6	I2C bit-clock
20	GND	Power		Ground reference
21	DN3_DP	AI/O		Downstream port 3 D+ connection
22	DN3_DM	AI/O		Downstream port 3 D± connection
23	DN2_DP	AI/O		Downstream port 2 D+ connection
24	DN2_DM	AI/O		Downstream port 2 D- connection
25	AGND	Power		Analog Ground reference
26	AVCC	Power		Analog voltage supply 3.3V ± 0.3V
27	UP_DP	AI/O		Upstream D+ connection
28	UP_DM	AI/O		Upstream D- connection

NOTE:

1.Signals ending in _N indicate active low signals.

ST: Schmitt Trigger

OD6: Open Drain with 6 mA drive AI/O: Analog I/O

1999 Jul 22

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Philips Semiconductors	Product specification
USB 2-port hub	PDIUSBH12

Pin description (MODE 1 ± Individual Overcurrent)

PIN NO	PIN SYMBOL	TYPE	DRIVE	DESCRIPTION
1	TEST1	Input		Connect to VCC for 48MHz crystal input.
				Connect to Ground for 12MHz crystal input.
2	TEST2	Input		Connect to VCC
3	TEST3	Input		Connect to Ground
4	RESET_N	Input	ST	Power-on reset
5	GND	Power		Ground reference
6	XTAL1	Input		Crystal connection 1 (48 or 12MHz depending on TEST1 pin)
7	XTAL2	Output		Crystal connection 2 (48 or 12MHz depending on TEST1 pin)
8	CLKOUT	Output	3mA	Programmable output clock for external devices
9	VCC	Power		Voltage supply 3.3V ± 0.3V
				Downstream port 2 over-current notice. This pin is also use to sense the USB
10	OCURRENT2_N	Input	ST	VBUS. A LOW on this pin of less than 2 seconds is interpreted as an overcurrent
				notice; longer than 2 seconds is interpreted as loss of VBUS.
11	SWITCH_N	Output	OD6	Enables power to downstream ports
12	SUSPEND	Output	OD6	Device is in suspended state
13	DN2_GL_N	Output	OD6	Downstream port 2 GoodLink LED indicator
14	OCURRENT3_N	Input	ST	Downstream port 3 over-current notice
15	RSVD	Input		Reserved. Connect to GND for normal operation.
16	RSVD	Input		Reserved. Connect to GND for normal operation.
17	INT_N	Output	OD6	Connect to microcontroller interrupt
18	SDA	I/O	OD6	I2C bi-directional data
19	SCL	I/O	OD6	I2C bit-clock
20	GND	Power		Ground reference
21	DN3_DP	AI/O		Downstream port 3 D+ connection
22	DN3_DM	AI/O		Downstream port 3 D± connection
23	DN2_DP	AI/O		Downstream port 2 D+ connection
24	DN2_DM	AI/O		Downstream port 2 D- connection
25	AGND	Power		Analog Ground reference
26	AVCC	Power		Analog voltage supply 3.3V ± 0.3V
27	UP_DP	AI/O		Upstream D+ connection
28	UP_DM	AI/O		Upstream D- connection

NOTE:

1.Signals ending in _N indicate active low signals.

ST: Schmitt Trigger

OD6: Open Drain with 6 mA drive AI/O: Analog I/O

1999 Jul 22

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Philips Semiconductors	Product specification
USB 2-port hub	PDIUSBH12

APPLICATION DIAGRAM

USB

3.3V	UPSTREAM
		12MHz	CLKOUT
			I2C
	H12		μC

	USB
5V	DOWNSTREAM
POWER SWITCH	SWITCHED
AND	5V
OVERCURRENT CIRCUIT	GOODLINK LED

SV00853

I2C Interface

The I2C bus is used to interface to an external microcontroller needed to control the operation of the hub. For cost consideration, the target system microcontroller can be shared and utilized for this purpose. The PDIUSBH12 implements a slave I2C interface. When the PDIUSBH12 needs to communicate with the microcontroller it asserts an interrupt signal. The microcontroller services this interrupt by reading the appropriate status register on the PDIUSBH12 through the I2C bus. (For more information about the I2C serial bus, refer to the I2C Handbook, Philips order number 9397 750 00013).

The I2C interface on the PDIUSBH12 defines two types of transactions:

1.command transaction

A command transaction is used to define which data (e.g., status byte, buffer data, ...) will be read from / written to the USB interface in the next data transaction. A data transaction usually follows a command transaction.

2.data transaction

A data transaction reads data from / writes data to the USB interface. The meaning of the data is dependent on the command transaction which was sent before the data transaction.

Two addresses are used to differentiate between command and data transactions. Writing to the command address is interpreted as a command, while reading from / writing to the data address is used to transfer data between the PDIUSBH12 and the controller.

ADDRESS TABLE

	TYPE OF ADDRESS	PHYSICAL ADDRESS
		(MSB to LSB)
	Command	0011 011 (binary)
	Data	0011 010 (binary)

Protocol

An I2C transaction starts with a `Start Condition', followed by an address. When the address matches either the command or data address the transaction starts and runs until a `Stop Condition' or another `Start Condition' (repeated start) occurs.

The command address is write-only and is unable to do a read. The next bytes in the message are interpreted as commands. Several command bytes can be sent after one command address. Each of the command bytes is acknowledged and passed on to the Memory Management Unit inside the PDIUSBH12.

When the start condition address matches the data address, the next bytes are interpreted as data. When the RW bit in the address indicates a `master writes data to slave' (=`0') the bytes are received, acknowledged and passed on to the Memory Management Unit. If the RW bit in the address indicates a `master reads data from slave' (=`1') the PDIUSBH12 will send data to the master. The I2C-master must acknowledge all data bytes except the last one. In this way the I2C interface knows when the last byte has been transmitted and it then releases the SDA line so that the master controller can generate the STOP condition.

Repeated start support allows another packet to be sent without generating a Stop Condition.

Timing

The I2C interface in the PDIUSBH12 can support clock speeds up to 1MHz.

1999 Jul 22

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