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參數(shù)資料
| 型號： | ISP1123BD |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 總線控制器 |
| 英文描述： | CAP .068UF 100V PPS FILM ECH-S |
| 中文描述： | UNIVERSAL SERIAL BUS CONTROLLER, PQFP32 |
| 封裝： | 7 X 7 X 1.40 MM, PLASTIC, LQFP-32 |
| 文件頁數(shù)： | 21/49頁 |
| 文件大小： | 1155K |
| 代理商： | ISP1123BD |
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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 |
|---|---|
| ISP1123 | Universal Serial Bus compound hub |
| ISP1123D | Universal Serial Bus compound hub |
| ISP1123NB | Universal Serial Bus compound hub |
| ISP1130 | Universal Serial Bus compound hub with integrated keyboard controller |
| ISP1130DL | Universal Serial Bus compound hub with integrated keyboard controller |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ISP1123D | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Universal Serial Bus compound hub |
| 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 |
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