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PDF ISP1123D Data sheet ( Hoja de datos )
| Número de pieza | ISP1123D | |
| Descripción | Universal Serial Bus compound hub | |
| Fabricantes | NXP Semiconductors | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de ISP1123D (archivo pdf) en la parte inferior de esta página. Total 30 Páginas | ||
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ISP1123
Universal Serial Bus compound hub
Rev. 01 — 5 October 1999
Preliminary specification
1. General description
The ISP1123 is a compound Universal Serial Bus (USB) hub device which complies
with USB Specification Rev. 1.1. It integrates a Serial Interface Engine (SIE), hub
repeater, hub controller, USB data transceivers and a 3.3 V voltage regulator. It has a
configurable number of downstream ports, ranging from 2 to 5, with one port
dedicated to an embedded or non-removable function.
The ISP1123 can be bus-powered, self-powered or hybrid-powered. When it is
hybrid-powered the hub functions are powered by the upstream power supply (VBUS),
but the downstream ports are powered by an external 5 Volt supply. The low power
consumption in ‘suspend’ mode allows easy design of equipment that is compliant
with the ACPI™, OnNow™ and USB power management requirements.
The ISP1123 has built-in overcurrent sense inputs, supporting individual and ganged
mode overcurrent protection for downstream ports. All ports (including the hub) have
GoodLink™ indicator outputs for easy visual monitoring of USB traffic. The ISP1123
has a serial I2C-bus interface for external EEPROM access and a reduced frequency
(6 MHz) crystal oscillator. These features allow significant cost savings in system
design and easy implementation of advanced USB functionality into PC peripherals.
c
2. Featuresc
s High performance USB hub device with integrated hub repeater, hub controller,
Serial Interface Engine (SIE), data transceivers and 3.3 V voltage regulator
s Complies with Universal Serial Bus Specification Rev. 1.1 and ACPI, OnNow and
USB power management requirements
s Downstream port 1 dedicated to a non-removable function, correctly reported in
the related descriptors
s Configurable from 2 to 5 downstream ports with automatic speed detection
s Internal power-on reset and low voltage reset circuit
s Supports bus-powered, hybrid-powered and self-powered application
s Individual or global power switching for downstream ports
s Individual or ganged port overcurrent protection with built-in sense circuits
s 6 MHz crystal oscillator with on-chip PLL for low EMI
s Visual USB traffic monitoring (GoodLink™) for hub and downstream ports
s I2C-bus interface to read vendor ID, product ID and configuration bits from
external EEPROM
1 page  
Philips Semiconductors
ISP1123
USB compound hub
Table 2: Pin description for SO32 and SDIP32…continued
Symbol [1]
Pin Type Description
PSW5/GL5/
GPSW [3]
18
O
mode 5: power switch control output for downstream port 5
(open-drain, 6 mA)
modes 3, 7: GoodLink LED indicator output for downstream
port 5 (open-drain, 6 mA); to connect an LED use a 330 Ω
series resistor
modes 0 to 2: gang mode power switch control output
(open-drain, 6 mA)
XTAL1
19 I
crystal oscillator input (6 MHz)
XTAL2
20 O
crystal oscillator output (6 MHz)
RESET [2]
21 I
reset input (Schmitt trigger); a LOW level produces an
asynchronous reset; connect to VCC for power-on reset
(internal POR circuit)
OPTION/SCL 22
I/O mode selection input; also functions as I2C-bus clock output
(open-drain, 6 mA)
INDV/SDA
23 I/O selects individual (HIGH) or global (LOW) power switching
and overcurrent detection; also functions as bidirectional
I2C-bus data line (open-drain, 6 mA)
DM5
24 AI/O downstream port 5 D− connection (analog) [4]
DP5 25 AI/O downstream port 5 D+ connection (analog) [4]
DM1
26 AI/O downstream port 1 D− connection (analog) [6]
DP1 27 AI/O downstream port 1 D+ connection (analog) [6]
DM0
28 AI/O upstream port D− connection (analog)
DP0 29 AI/O upstream port D+ connection (analog)
DM2
30 AI/O downstream port 2 D− connection (analog) [6]
DP2 31 AI/O downstream port 2 D+ connection (analog) [6]
PSW1/GL1 [3] 32 O
modes 4 to 6: power switch control output for downstream
port 1 (open-drain, 6 mA)
modes 0 to 3, 7: GoodLink LED indicator output for
downstream port 1 (open-drain, 6 mA); to connect an LED
use a 330 Ω series resistor
[1] Symbol names with an overscore (e.g. NAME) indicate active LOW signals.
[2] The voltage at pin Vreg(3.3) is gated by the RESET pin. This allows fully self-powered operation by
connecting RESET to VBUS (+5 V USB supply). If VBUS is lost upstream port D+ will not be driven.
[3] See Table 4 “Mode selection”.
[4] To disable a downstream port connect both D+ and D− to VCC via a 1 MΩ resistor; unused ports must
be disabled in reverse order starting from port 5.
[5] Analog detection circuit can be switched off using an external EEPROM, see Table 23; in this case,
the pin functions as a logic input (TTL level).
[6] Downstream ports 1 and 2 cannot be disabled.
9397 750 06325
Preliminary specification
Rev. 01 — 5 October 1999
© Philips Electronics N.V. 1999. All rights reserved.
5 of 49
5 Page 
Philips Semiconductors
ISP1123
USB compound hub
9. Endpoint descriptions
Each USB device is logically composed of several independent endpoints. An
endpoint acts as a terminus of a communication flow between the host and the
device. At design time each endpoint is assigned a unique number (endpoint
identifier, see Table 5). The combination of the device address (given by the host
during enumeration), the endpoint number and the transfer direction allows each
endpoint to be uniquely referenced.
The ISP1123 has two endpoints, endpoint 0 (control) and endpoint 1 (interrupt).
Table 5: Hub endpoints
Function Ports
0: upstream
Hub
1 to 5: downstream
Endpoint Transfer
identifier type
0 control
1 interrupt
Direction [1] Max. packet
size (bytes)
OUT
64
IN 64
IN 1
[1] IN: input for the USB host; OUT: output from the USB host.
9.1 Hub endpoint 0 (control)
All USB devices and functions must implement a default control endpoint (ID = 0).
This endpoint is used by the host to configure the device and to perform generic USB
status and control access.
The ISP1123 hub supports the following USB descriptor information through its
control endpoint 0, which can handle transfers of 64 bytes maximum:
• Device descriptor
• Configuration descriptor
• Interface descriptor
• Endpoint descriptor
• Hub descriptor
• String descriptor.
9.2 Hub endpoint 1 (interrupt)
Endpoint 1 is used by the ISP1123 hub to provide status change information to the
host. This endpoint can be accessed only after the hub has been configured by the
host (by sending the Set Configuration command).
Endpoint 1 is an interrupt endpoint: the host polls it once every 255 ms by sending an
IN token. If the hub has detected no change in the port status it returns a NAK (Not
AcKnowledge) response to this request, otherwise it sends the Status Change byte
(see Table 6).
9397 750 06325
Preliminary specification
Rev. 01 — 5 October 1999
© Philips Electronics N.V. 1999. All rights reserved.
11 of 49
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet ISP1123D.PDF ] | |
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