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參數(shù)資料
型號(hào)： ISP1122AD
廠商： NXP SEMICONDUCTORS
元件分類： 總線控制器
英文描述： Universal Serial Bus stand-alone hub
中文描述： UNIVERSAL SERIAL BUS CONTROLLER, PDSO32
封裝： 7.50 MM, PLASTIC, SO-48
文件頁(yè)數(shù)： 20/48頁(yè)
文件大小： 1150K
代理商： ISP1122AD
Philips Semiconductors
ISP1122A
USB stand-alone hub
Preliminary specification
Rev. 01 — 27 March 2000
20 of 48
9397 750 06986
Philips Electronics N.V. 2000. All rights reserved.
9.4.6
Get configuration descriptor
The hub returns 25 bytes containing the configuration descriptor (9 bytes, see
Table 11
), the interface descriptor (9 bytes, see
Table 12
) and the endpoint descriptor
(7 bytes, see
Table 13
).
9.4.7
Get device descriptor
The hub returns 18 bytes containing the device descriptor, see
Table 10
.
9.4.8
Get hub descriptor
The hub returns 9 bytes containing the hub descriptor, see
Table 14
.
9.4.9
Get string descriptor (0)
The hub returns 4 bytes containing the language ID, see
Table 15
.
9.4.10
Get string descriptor (1)
The hub returns 46 bytes containing the manufacturer name, see
Table 15
.
9.4.11
Get string descriptor (2)
The hub returns 16 bytes containing the product name, see
Table 15
.
10. I
2
C-bus interface
A simple I
2
C-bus interface is provided in the ISP1122A to read customized vendor ID,
product ID and some other configuration bits from an external EEPROM. The
interface supports single master operation at a nominal bus speed of 93.75 kHz.
The I
2
C-bus interface is intended for bidirectional communication between ICs via two
serial bus wires, SDA (data) and SCL (clock). Both lines are driven by open-drain
circuits and must be connected to the positive supply voltage via pull-up resistors.
10.1 Protocol
The I
2
C-bus protocol defines the following conditions:
Bus free
: both SDA and SCL are HIGH
START
: a HIGH-to-LOW transition on SDA, while SCL is HIGH
STOP
: a LOW-to-HIGH transition on SDA, while SCL is HIGH
Data valid
: after a START condition, data on SDA are stable during the HIGH
period of SCL; data on SDA may only change while SCL is LOW.
Each device on the I
2
C-bus has a unique slave address, which the master uses to
select a device for access.
The master starts a data transfer using a START condition and ends it by generating
a STOP condition. Transfers can only be initiated when the bus is free. The receiver
must acknowledge each byte by means of a LOW level on SDA during the ninth clock
pulse on SCL.
For detailed information please consult The I
2
C-bus and how to use it, order number
9398 393 40011.
相關(guān)PDF資料
PDF描述
ISP1122ANB Universal Serial Bus stand-alone hub
ISP1122 Universal Serial Bus stand-alone hub
ISP1122BD Universal Serial Bus stand-alone hub
ISP1122D Universal Serial Bus stand-alone hub
ISP1122NB Universal Serial Bus stand-alone hub
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
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
ISP1122NB 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Universal Serial Bus stand-alone hub
ISP1123 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Universal Serial Bus compound hub
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