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參數(shù)資料
| 型號： | ISP1122A |
| 廠商： | NXP Semiconductors N.V. |
| 英文描述： | Universal Serial Bus stand-alone hub |
| 中文描述： | 通用串行總線獨立的樞紐 |
| 文件頁數(shù)： | 8/48頁 |
| 文件大小： | 1150K |
| 代理商： | ISP1122A |
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Philips Semiconductors
ISP1122A
USB stand-alone hub
Preliminary specification
Rev. 01 — 27 March 2000
8 of 48
9397 750 06986
Philips Electronics N.V. 2000. All rights reserved.
[1]
[2]
Symbol names with an overscore (e.g. NAME) indicate active LOW signals.
The voltage at pin V
reg(3.3)
is gated by the RESET pin. This allows fully self-powered operation by
connecting RESET to V
BUS
(+5 V USB supply). If V
BUS
is lost upstream port D+ will not be driven.
See
Table 4 “Mode selection”
.
To disable a downstream port connect both D
+
and D
to V
CC
via a 1 M
resistor; unused ports must
be disabled in reverse order starting from port 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).
Downstream ports 1 and 2 cannot be disabled.
[3]
[4]
[5]
[6]
6.
Functional description
The ISP1122A is a stand-alone USB hub with up to 5 downstream ports. The number
of ports can be configured between 2 and 5. The downstream ports can be used to
connect low-speed or full-speed USB peripherals. All standard USB requests from
the host are handled by the hardware without the need for firmware intervention. The
block diagram is shown in
Figure 1
.
The ISP1122A requires only a single supply voltage. An internal 3.3 V regulator
provides the supply voltage for the analog USB data transceivers.
The ISP1122A supports both bus-powered and self-powered hub operation. When
using bus-powered operation a downstream port cannot supply more than 100 mA to
a peripheral. In case of self-powered operation an external supply is used to power
the downstream ports, allowing a current consumption of max. 500 mA per port.
A basic I
2
C-bus interface is provided for reading vendor ID, product ID and
configuration bits from an external EEPROM upon a reset.
6.1 Analog transceivers
The integrated transceiver interfaces directly to the USB cables through external
termination resistors. They are capable of transmitting and receiving serial data at
both ‘full-speed’ (12 Mbit/s) and ‘low-speed’ (1.5 Mbit/s) data rates. The slew rates
are adjusted according to the speed of the device connected and lie within the range
mentioned in the USB Specification Rev. 1.1
DM2
DP2
PSW1/GL1
[3]
26
27
28
AI/O
AI/O
O
downstream port 2 D
connection (analog)
[6]
downstream port 2 D
+
connection (analog)
[6]
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
series resistor
Table 3:
Symbol
[1]
Pin description for LQFP32
…continued
Pin
Type
Description
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| ISP1122ABD | Universal Serial Bus stand-alone hub |
| ISP1122AD | Universal Serial Bus stand-alone hub |
| ISP1122ANB | Universal Serial Bus stand-alone hub |
| ISP1122 | Universal Serial Bus stand-alone hub |
| ISP1122BD | Universal Serial Bus stand-alone hub |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ISP1122ABD | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Universal Serial Bus stand-alone hub |
| ISP1122AD | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Universal Serial Bus stand-alone hub |
| ISP1122ANB | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Universal Serial Bus stand-alone hub |
| ISP1122BD | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Universal Serial Bus stand-alone hub |
| ISP1122D | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Universal Serial Bus stand-alone hub |
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