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)： 21/48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
21 of 48
9397 750 06986
Philips Electronics N.V. 2000. All rights reserved.
10.2 Hardware connections
Via the I
2
C-bus interface the ISP1122A can be connected to an external EEPROM
(PCF8582 or equivalent). The hardware connections are shown in
Figure 5
.
The SCL and SDA pins are multiplexed with pins OPTION and INDV respectively.
The slave address which ISP1122A uses to access the EEPROM is 1010000B. Page
mode addressing is not supported, so pins A0, A1 and A2 of the EEPROM must be
connected to GND (logic 0).
10.3 Data transfer
When the ISP1122A is reset, the I
2
C-bus interface tries to read 6 bytes of
configuration data from an external EEPROM. If no response is detected, the levels
on inputs SDA and SCL are interpreted as INDV and OPTION to select the operating
mode (see
Table 4
).
The data in the EEPROM memory are organized as shown in
Table 22
.
[1]
[2]
Vendor ID code in the Device descriptor, see
Table 10
.
Product ID code in the Device descriptor, see
Table 10
.
Fig 5.
EEPROM connection diagram.
idth
MBL166
INDV/SDA
OPTION/SCL
A1
A2
A0
SDA
SCL
VDD
RP
RP
VDD
ISP1122A
USB HUB
PCF8582
EEPROM
or
equivalent
I
2
C-bus
Table 22: EEPROM organization
Address
(Hex)
00
01
02
03
04
05
Default value
(Hex)
CC
04
22
11
-
AA
Contents
idVendor
[1]
(lower byte)
idVendor
[1]
(upper byte)
idProduct
[2]
(lower byte)
idProduct
[2]
(upper byte)
configuration bits C7 to C0; see
Table 23
signature
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