參數(shù)資料
型號(hào)： ISP1123D
廠商： NXP SEMICONDUCTORS
元件分類： 總線控制器
英文描述： Universal Serial Bus compound hub
中文描述： UNIVERSAL SERIAL BUS CONTROLLER, PDSO32
封裝： 7.50 MM, PLASTIC, SO-32
文件頁(yè)數(shù)： 21/49頁(yè)
文件大?。?/td> 1155K
代理商： ISP1123D
Philips Semiconductors
ISP1123
USB compound hub
Preliminary specification
Rev. 01 — 5 October 1999
21 of 49
9397 750 06325
Philips Electronics N.V. 1999. All rights reserved.
11. I
2
C-bus interface
A simple I
2
C-bus interface is provided in the ISP1123 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.
11.1 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.
11.2 Hardware connections
Via the I
2
C-bus interface the ISP1123 can be connected to an external EEPROM
(PCF8582 or equivalent). The hardware connections are shown in
Figure 6
.
The SCL and SDA pins are multiplexed with pins OPTION and INDV respectively.
Fig 6.
EEPROM connection diagram.
idth
MBL081
INDV/SDA
OPTION/SCL
A1
A2
A0
SDA
SCL
VDD
RP
RP
VDD
ISP1123
USB HUB
PCF8582
EEPROM
or
equivalent
I
2
C-bus
相關(guān)PDF資料
PDF描述
ISP1123NB Universal Serial Bus compound hub
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
ISP1123NB 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Universal Serial Bus compound hub
ISP1130 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Universal Serial Bus compound hub with integrated keyboard controller
ISP1130DL 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Universal Serial Bus compound hub with integrated keyboard controller
ISP1130N 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Universal Serial Bus compound hub with integrated keyboard controller
ISP1160 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Embedded Universal Serial Bus Host Controller
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